Today's Message Index:
----------------------
1. 04:15 AM - Re: Who is good mechanic on the Yak52 in the North Texas area? (N395V)
2. 04:38 AM - Re: Why would my Yak 52 m14p lose power? (A. Dennis Savarese)
3. 04:53 AM - Re: Why would my Yak 52 m14p lose power? (George Coy)
4. 05:17 AM - Re: Why would my Yak 52 m14p lose power? (A. Dennis Savarese)
5. 05:50 AM - Re: Why would my Yak 52 m14p lose power? ()
6. 06:39 AM - Re: Who is good mechanic on the Yak52 in the North Texas area? (napeone)
7. 07:37 AM - Re: Why would my Yak 52 m14p lose power? (BPA)
8. 09:17 AM - Re: Why would my Yak 52 m14p lose power? (Forrest Johnson)
9. 11:44 AM - Re: Why would my Yak 52 m14p lose power? (John Clayton)
10. 12:07 PM - Re: Why would my Yak 52 m14p lose power? (Monty Barrett Sr)
Message 1
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| Subject: | Re: Who is good mechanic on the Yak52 in the North Texas |
area?
Try posting here you question at the link below "The Yak List"....
http://forums.matronics.com/viewforum.php?f=6&sid=8a3c0ce2be3ae4df3e3413c903a95cfc
--------
Milt
2003 F1 Rocket
2006 Radial Rocket
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=220113#220113
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| Subject: | Re: Why would my Yak 52 m14p lose power? |
Sounds like it could very well be carb ice. I would remove and inspect
ALL fuel screens/filters including the one at the rear of the carburetor
just above the fuel inlet. It's a 22 mm nut.
Dennis
----- Original Message -----
From: markgreenway
To: m14pengines-list@matronics.com
Sent: Thursday, December 18, 2008 8:30 PM
Subject: M14PEngines-List: Why would my Yak 52 m14p lose power?
<geewhizmark@gmail.com>
Hello Guys
Any idea why I lost power and had to make a forced landing
,because when crossing midfield for landing, the motor lost power when I
throttled back. It never totally died and it regained power once on the
ground after a few minutes and then it powered up and ran just fine?
It has some Les Crowder mods on it, and I am not sure if those mods
change the normal operations of the mp14.
I would ask Les Crowder if he were still with us. I have been
asking around and have had some great advice from some very nice Yak
people.
Just not sure if I am safe. I have been flying a Mooney and a V-Tail,
this is so different.
Now I am afraid to fly until I feel like I have found the answer. It
reminds me of a carb ice situation.
Who around the North Texas area would the right person to pay to go
through the motor and check things out for me?
Thanks so much
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=220084#220084
Message 3
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| Subject: | Why would my Yak 52 m14p lose power? |
Dennis,
As you know the M14P engine has a pressure carb. the fuel is injected
down stream of the venturii. It is very similar to a throttle body injection
system. As fuel is not evaporating in the low pressure area (lower
temperature area per Boyles law) by the venturi, the pressure carburetor is
almost immune to carb ice. (particularly in Texas)
It is much more likely that the engine loaded up at reduced throttle.
Reading between the lines, the pilot admits he does not have much experience
with radial engines.
I always try to teach new guys to use a throttle reduction to zero thrust
rather than to completely pull the throttle back. If you really need the
dynamic braking of a idling engine, then at least :CLEAR" the engine by
periodically opening the throttle and clearing out the loaded up spark
plugs.
George Coy
_____
From: owner-m14pengines-list-server@matronics.com
[mailto:owner-m14pengines-list-server@matronics.com] On Behalf Of A. Dennis
Savarese
Sent: Friday, December 19, 2008 7:37 AM
Subject: Re: M14PEngines-List: Why would my Yak 52 m14p lose power?
Sounds like it could very well be carb ice. I would remove and inspect ALL
fuel screens/filters including the one at the rear of the carburetor just
above the fuel inlet. It's a 22 mm nut.
Dennis
----- Original Message -----
From: markgreenway <mailto:geewhizmark@gmail.com>
Sent: Thursday, December 18, 2008 8:30 PM
Subject: M14PEngines-List: Why would my Yak 52 m14p lose power?
<geewhizmark@gmail.com>
Hello Guys
Any idea why I lost power and had to make a forced landing ,because when
crossing midfield for landing, the motor lost power when I throttled back.
It never totally died and it regained power once on the ground after a few
minutes and then it powered up and ran just fine?
It has some Les Crowder mods on it, and I am not sure if those mods change
the normal operations of the mp14.
I would ask Les Crowder if he were still with us. I have been asking
around and have had some great advice from some very nice Yak people.
Just not sure if I am safe. I have been flying a Mooney and a V-Tail, this
is so different.
Now I am afraid to fly until I feel like I have found the answer. It reminds
me of a carb ice situation.
Who around the North Texas area would the right person to pay to go through
the motor and check things out for me?
Thanks so much
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=220084#220084
http://www.matronics.com/c Thank you for your generous ;
-Matt Dralle, List nbsp; Features Chat, http://www.mnbsp;
<http://www.matronics.com/Navigator?M14PEngines-List> via the Web
href="http://forums.matronics.com">http://forums.matronics.com
_=============
Message 4
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| Subject: | Re: Why would my Yak 52 m14p lose power? |
I completely agree with you George. However a mutual friend, Dave
Harcourt, is 100% convinced he has experienced carb ice on a least a
couple of occasions and had to use the carb heat to cure the problem and
will not back down from that theory under any circumstances.
Excellent words of wisdom on use of the throttle too.
Merry Christmas to you, Cliff and your families.
Dennis
----- Original Message -----
From: George Coy
To: m14pengines-list@matronics.com
Sent: Friday, December 19, 2008 6:52 AM
Subject: RE: M14PEngines-List: Why would my Yak 52 m14p lose power?
Dennis,
As you know the M14P engine has a pressure carb. the fuel is
injected down stream of the venturii. It is very similar to a throttle
body injection system. As fuel is not evaporating in the low pressure
area (lower temperature area per Boyles law) by the venturi, the
pressure carburetor is almost immune to carb ice. (particularly in
Texas)
It is much more likely that the engine loaded up at reduced
throttle. Reading between the lines, the pilot admits he does not have
much experience with radial engines.
I always try to teach new guys to use a throttle reduction to zero
thrust rather than to completely pull the throttle back. If you really
need the dynamic braking of a idling engine, then at least :CLEAR" the
engine by periodically opening the throttle and clearing out the loaded
up spark plugs.
George Coy
-------------------------------------------------------------------------
-----
From: owner-m14pengines-list-server@matronics.com
[mailto:owner-m14pengines-list-server@matronics.com] On Behalf Of A.
Dennis Savarese
Sent: Friday, December 19, 2008 7:37 AM
To: m14pengines-list@matronics.com
Subject: Re: M14PEngines-List: Why would my Yak 52 m14p lose power?
Sounds like it could very well be carb ice. I would remove and
inspect ALL fuel screens/filters including the one at the rear of the
carburetor just above the fuel inlet. It's a 22 mm nut.
Dennis
----- Original Message -----
From: markgreenway
To: m14pengines-list@matronics.com
Sent: Thursday, December 18, 2008 8:30 PM
Subject: M14PEngines-List: Why would my Yak 52 m14p lose power?
<geewhizmark@gmail.com>
Hello Guys
Any idea why I lost power and had to make a forced landing
,because when crossing midfield for landing, the motor lost power when I
throttled back. It never totally died and it regained power once on the
ground after a few minutes and then it powered up and ran just fine?
It has some Les Crowder mods on it, and I am not sure if those mods
change the normal operations of the mp14.
I would ask Les Crowder if he were still with us. I have been
asking around and have had some great advice from some very nice Yak
people.
Just not sure if I am safe. I have been flying a Mooney and a
V-Tail, this is so different.
Now I am afraid to fly until I feel like I have found the answer. It
reminds me of a carb ice situation.
Who around the North Texas area would the right person to pay to go
through the motor and check things out for me?
Thanks so much
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=220084#220084
http://www.matronics.com/c Thank you for your generous ;
-Matt Dralle, List nbsp; Features Chat, http://www.mnbsp;
via the Web
href="http://forums.matronics.com">http://forums.matronics.com
_=============
href="http://www.matronics.com/contribution">http://www.matronics.com/c
href="http://www.matronics.com/Navigator?M14PEngines-List">http://www.m
atronics.com/Navigator?M14PEngines-List
href="http://forums.matronics.com">http://forums.matronics.com
Message 5
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| Subject: | Re: Why would my Yak 52 m14p lose power? |
Be careful about being 100% convinced about anything....a good friend
was convinced he was experiencing carb ice on his Lycoming O-360....carb
heat helped, but he later (more than a year later!) realized it was a
fuel flow problem........
Remember.....
1. Ain't no future in beating your head against the wall
2. Keep doing the same thing and you'll get the same results
3. If you can't fix it with a hammer, you have an electrical problem
----- Original Message -----
From: A. Dennis Savarese
To: m14pengines-list@matronics.com
Sent: Friday, December 19, 2008 8:16 AM
Subject: Re: M14PEngines-List: Why would my Yak 52 m14p lose power?
I completely agree with you George. However a mutual friend, Dave
Harcourt, is 100% convinced he has experienced carb ice on a least a
couple of occasions and had to use the carb heat to cure the problem and
will not back down from that theory under any circumstances.
Excellent words of wisdom on use of the throttle too.
Merry Christmas to you, Cliff and your families.
Dennis
----- Original Message -----
From: George Coy
To: m14pengines-list@matronics.com
Sent: Friday, December 19, 2008 6:52 AM
Subject: RE: M14PEngines-List: Why would my Yak 52 m14p lose power?
Dennis,
As you know the M14P engine has a pressure carb. the fuel is
injected down stream of the venturii. It is very similar to a throttle
body injection system. As fuel is not evaporating in the low pressure
area (lower temperature area per Boyles law) by the venturi, the
pressure carburetor is almost immune to carb ice. (particularly in
Texas)
It is much more likely that the engine loaded up at reduced
throttle. Reading between the lines, the pilot admits he does not have
much experience with radial engines.
I always try to teach new guys to use a throttle reduction to zero
thrust rather than to completely pull the throttle back. If you really
need the dynamic braking of a idling engine, then at least :CLEAR" the
engine by periodically opening the throttle and clearing out the loaded
up spark plugs.
George Coy
-------------------------------------------------------------------------
---
From: owner-m14pengines-list-server@matronics.com
[mailto:owner-m14pengines-list-server@matronics.com] On Behalf Of A.
Dennis Savarese
Sent: Friday, December 19, 2008 7:37 AM
To: m14pengines-list@matronics.com
Subject: Re: M14PEngines-List: Why would my Yak 52 m14p lose power?
Sounds like it could very well be carb ice. I would remove and
inspect ALL fuel screens/filters including the one at the rear of the
carburetor just above the fuel inlet. It's a 22 mm nut.
Dennis
----- Original Message -----
From: markgreenway
To: m14pengines-list@matronics.com
Sent: Thursday, December 18, 2008 8:30 PM
Subject: M14PEngines-List: Why would my Yak 52 m14p lose power?
<geewhizmark@gmail.com>
Hello Guys
Any idea why I lost power and had to make a forced landing
,because when crossing midfield for landing, the motor lost power when I
throttled back. It never totally died and it regained power once on the
ground after a few minutes and then it powered up and ran just fine?
It has some Les Crowder mods on it, and I am not sure if those
mods change the normal operations of the mp14.
I would ask Les Crowder if he were still with us. I have been
asking around and have had some great advice from some very nice Yak
people.
Just not sure if I am safe. I have been flying a Mooney and a
V-Tail, this is so different.
Now I am afraid to fly until I feel like I have found the answer.
It reminds me of a carb ice situation.
Who around the North Texas area would the right person to pay to
go through the motor and check things out for me?
Thanks so much
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=220084#220084
http://www.matronics.com/c Thank you for your generous ;
-Matt Dralle, List nbsp; Features Chat,
http://www.mnbsp; via the Web
href="http://forums.matronics.com">http://forums.matronics.com
_=============
href="http://www.matronics.com/contribution">http://www.matronics.com/c
href="http://www.matronics.com/Navigator?M14PEngines-List">http://www.m
atronics.com/Navigator?M14PEngines-List
href="http://forums.matronics.com">http://forums.matronics.com
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href="http://www.matronics.com/Navigator?M14PEngines-List">http://www.m
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| Subject: | Re: Who is good mechanic on the Yak52 in the North Texas |
area?
You may well have had an icing event. What were the weather conditions at the time
of the occurence?
David H.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=220129#220129
Message 7
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| Subject: | Why would my Yak 52 m14p lose power? |
COOL dude. I like the paint scheme. Have a good time fishing?
-----Original Message-----
From: owner-m14pengines-list-server@matronics.com
[mailto:owner-m14pengines-list-server@matronics.com] On Behalf Of
doug@ripleyair.com
Sent: Friday, December 19, 2008 7:50 AM
Subject: Re: M14PEngines-List: Why would my Yak 52 m14p lose power?
Be careful about being 100% convinced about anything....a good friend
was convinced he was experiencing carb ice on his Lycoming O-360....carb
heat helped, but he later (more than a year later!) realized it was a
fuel flow problem........
Remember.....
1. Ain't no future in beating your head against the wall
2. Keep doing the same thing and you'll get the same results
3. If you can't fix it with a hammer, you have an electrical problem
----- Original Message -----
From: A. Dennis Savarese <mailto:dsavarese0812@bellsouth.net>
To: m14pengines-list@matronics.com
Sent: Friday, December 19, 2008 8:16 AM
Subject: Re: M14PEngines-List: Why would my Yak 52 m14p lose
power?
I completely agree with you George. However a mutual friend,
Dave Harcourt, is 100% convinced he has experienced carb ice on a least
a couple of occasions and had to use the carb heat to cure the problem
and will not back down from that theory under any circumstances.
Excellent words of wisdom on use of the throttle too.
Merry Christmas to you, Cliff and your families.
Dennis
----- Original Message -----
From: George Coy <mailto:george@gesoco.com>
To: m14pengines-list@matronics.com
Sent: Friday, December 19, 2008 6:52 AM
Subject: RE: M14PEngines-List: Why would my Yak 52 m14p
lose power?
Dennis,
As you know the M14P engine has a pressure carb. the
fuel is injected down stream of the venturii. It is very similar to a
throttle body injection system. As fuel is not evaporating in the low
pressure area (lower temperature area per Boyles law) by the venturi,
the pressure carburetor is almost immune to carb ice. (particularly in
Texas)
It is much more likely that the engine loaded up at
reduced throttle. Reading between the lines, the pilot admits he does
not have much experience with radial engines.
I always try to teach new guys to use a throttle
reduction to zero thrust rather than to completely pull the throttle
back. If you really need the dynamic braking of a idling engine, then at
least :CLEAR" the engine by periodically opening the throttle and
clearing out the loaded up spark plugs.
George Coy
________________________________
From: owner-m14pengines-list-server@matronics.com
[mailto:owner-m14pengines-list-server@matronics.com] On Behalf Of A.
Dennis Savarese
Sent: Friday, December 19, 2008 7:37 AM
To: m14pengines-list@matronics.com
Subject: Re: M14PEngines-List: Why would my Yak 52 m14p
lose power?
Sounds like it could very well be carb ice. I would
remove and inspect ALL fuel screens/filters including the one at the
rear of the carburetor just above the fuel inlet. It's a 22 mm nut.
Dennis
----- Original Message -----
From: markgreenway
<mailto:geewhizmark@gmail.com>
To: m14pengines-list@matronics.com
Sent: Thursday, December 18, 2008 8:30 PM
Subject: M14PEngines-List: Why would my Yak 52
m14p lose power?
"markgreenway" <geewhizmark@gmail.com>
Hello Guys
Any idea why I lost power and had to make a
forced landing ,because when crossing midfield for landing, the motor
lost power when I throttled back. It never totally died and it regained
power once on the ground after a few minutes and then it powered up and
ran just fine?
It has some Les Crowder mods on it, and I am not
sure if those mods change the normal operations of the mp14.
I would ask Les Crowder if he were still
with us. I have been asking around and have had some great advice from
some very nice Yak people.
Just not sure if I am safe. I have been flying a
Mooney and a V-Tail, this is so different.
Now I am afraid to fly until I feel like I have
found the answer. It reminds me of a carb ice situation.
Who around the North Texas area would the right
person to pay to go through the motor and check things out for me?
Thanks so much
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=220084#220084
<BP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;
href="http://www.matronics.com/contribution" Free link Annual the Get
(And Month This Lists Your Support Please -->http://www.matronics.com/c
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Message 8
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| Subject: | Re: Why would my Yak 52 m14p lose power? |
I had a similar problem with mt CJ with a M14 conversion. Discovered the
primer was not installed properly , thought it was off when it was still
in the on position there fore was loading up in low ower setting. Could
not get idel adjustment correct because ideling to rich. Made correction
to primer (made sure in off position) solved problem.
----- Original Message -----
From: A. Dennis Savarese
To: m14pengines-list@matronics.com
Sent: Friday, December 19, 2008 7:16 AM
Subject: Re: M14PEngines-List: Why would my Yak 52 m14p lose power?
I completely agree with you George. However a mutual friend, Dave
Harcourt, is 100% convinced he has experienced carb ice on a least a
couple of occasions and had to use the carb heat to cure the problem and
will not back down from that theory under any circumstances.
Excellent words of wisdom on use of the throttle too.
Merry Christmas to you, Cliff and your families.
Dennis
----- Original Message -----
From: George Coy
To: m14pengines-list@matronics.com
Sent: Friday, December 19, 2008 6:52 AM
Subject: RE: M14PEngines-List: Why would my Yak 52 m14p lose power?
Dennis,
As you know the M14P engine has a pressure carb. the fuel is
injected down stream of the venturii. It is very similar to a throttle
body injection system. As fuel is not evaporating in the low pressure
area (lower temperature area per Boyles law) by the venturi, the
pressure carburetor is almost immune to carb ice. (particularly in
Texas)
It is much more likely that the engine loaded up at reduced
throttle. Reading between the lines, the pilot admits he does not have
much experience with radial engines.
I always try to teach new guys to use a throttle reduction to zero
thrust rather than to completely pull the throttle back. If you really
need the dynamic braking of a idling engine, then at least :CLEAR" the
engine by periodically opening the throttle and clearing out the loaded
up spark plugs.
George Coy
-------------------------------------------------------------------------
---
From: owner-m14pengines-list-server@matronics.com
[mailto:owner-m14pengines-list-server@matronics.com] On Behalf Of A.
Dennis Savarese
Sent: Friday, December 19, 2008 7:37 AM
To: m14pengines-list@matronics.com
Subject: Re: M14PEngines-List: Why would my Yak 52 m14p lose power?
Sounds like it could very well be carb ice. I would remove and
inspect ALL fuel screens/filters including the one at the rear of the
carburetor just above the fuel inlet. It's a 22 mm nut.
Dennis
----- Original Message -----
From: markgreenway
To: m14pengines-list@matronics.com
Sent: Thursday, December 18, 2008 8:30 PM
Subject: M14PEngines-List: Why would my Yak 52 m14p lose power?
<geewhizmark@gmail.com>
Hello Guys
Any idea why I lost power and had to make a forced landing
,because when crossing midfield for landing, the motor lost power when I
throttled back. It never totally died and it regained power once on the
ground after a few minutes and then it powered up and ran just fine?
It has some Les Crowder mods on it, and I am not sure if those
mods change the normal operations of the mp14.
I would ask Les Crowder if he were still with us. I have been
asking around and have had some great advice from some very nice Yak
people.
Just not sure if I am safe. I have been flying a Mooney and a
V-Tail, this is so different.
Now I am afraid to fly until I feel like I have found the answer.
It reminds me of a carb ice situation.
Who around the North Texas area would the right person to pay to
go through the motor and check things out for me?
Thanks so much
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=220084#220084
http://www.matronics.com/c Thank you for your generous ;
-Matt Dralle, List nbsp; Features Chat,
http://www.mnbsp; via the Web
href="http://forums.matronics.com">http://forums.matronics.com
_=============
href="http://www.matronics.com/contribution">http://www.matronics.com/c
href="http://www.matronics.com/Navigator?M14PEngines-List">http://www.m
atronics.com/Navigator?M14PEngines-List
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Message 9
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| Subject: | Why would my Yak 52 m14p lose power? |
Dennis
I would get hold of Jim Kimball Enterprises
http://www.jimkimballenterprises.com/web/index.php they have a mod that you
can do to the carb. that will probably take care of your problem.
John Clayton
Pitts Model 12 builder
09/03/00 MIXTURE CONTROL, ACCELERATOR PUMP MODS, STUMBLE
The mixture is not actually slaved to the throttle. It is controlled by a
barrometric pressure anneroid. This system senses the barr. press. and sets
the mixture accordingly. From 0 to 5000ft. it stays full rich. From 5000ft
up it leans out. There is an accelerator pump curcuit that is coupled to
the throttle to ad extra fuel when the throttle is rapidly advanced. This
accell pump is the cause of the "stumble" that most M-14Ps have when the
throttle is pushed up after being at idle or near idle for a while. This
can be adjusted out with a series of different needles etc to get it right
for your condititions and piloting. However, nobody does this and they live
with the stumble. There is a carb mod done here that we have done on our
Model 12 and a few other M-14Ps around here. It involves plugging this
accell pump passage. Very simple, and very effective. The throttle
response on our 12 is fantastic, like a dragster. KK
-----Original Message-----
From: owner-m14pengines-list-server@matronics.com
[mailto:owner-m14pengines-list-server@matronics.com]On Behalf Of George Coy
Sent: Friday, December 19, 2008 5:53 AM
To: m14pengines-list@matronics.com
Subject: RE: M14PEngines-List: Why would my Yak 52 m14p lose power?
Dennis,
As you know the M14P engine has a pressure carb. the fuel is injected
down stream of the venturii. It is very similar to a throttle body injection
system. As fuel is not evaporating in the low pressure area (lower
temperature area per Boyles law) by the venturi, the pressure carburetor is
almost immune to carb ice. (particularly in Texas)
It is much more likely that the engine loaded up at reduced throttle.
Reading between the lines, the pilot admits he does not have much experience
with radial engines.
I always try to teach new guys to use a throttle reduction to zero thrust
rather than to completely pull the throttle back. If you really need the
dynamic braking of a idling engine, then at least :CLEAR" the engine by
periodically opening the throttle and clearing out the loaded up spark
plugs.
George Coy
----------------------------------------------------------------------------
--
From: owner-m14pengines-list-server@matronics.com
[mailto:owner-m14pengines-list-server@matronics.com] On Behalf Of A. Dennis
Savarese
Sent: Friday, December 19, 2008 7:37 AM
To: m14pengines-list@matronics.com
Subject: Re: M14PEngines-List: Why would my Yak 52 m14p lose power?
Sounds like it could very well be carb ice. I would remove and inspect
ALL fuel screens/filters including the one at the rear of the carburetor
just above the fuel inlet. It's a 22 mm nut.
Dennis
----- Original Message -----
From: markgreenway
To: m14pengines-list@matronics.com
Sent: Thursday, December 18, 2008 8:30 PM
Subject: M14PEngines-List: Why would my Yak 52 m14p lose power?
<geewhizmark@gmail.com>
Hello Guys
Any idea why I lost power and had to make a forced landing ,because
when crossing midfield for landing, the motor lost power when I throttled
back. It never totally died and it regained power once on the ground after a
few minutes and then it powered up and ran just fine?
It has some Les Crowder mods on it, and I am not sure if those mods
change the normal operations of the mp14.
I would ask Les Crowder if he were still with us. I have been asking
around and have had some great advice from some very nice Yak people.
Just not sure if I am safe. I have been flying a Mooney and a V-Tail,
this is so different.
Now I am afraid to fly until I feel like I have found the answer. It
reminds me of a carb ice situation.
Who around the North Texas area would the right person to pay to go
through the motor and check things out for me?
Thanks so much
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=220084#220084
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| Subject: | Why would my Yak 52 m14p lose power? |
George Coy is partially correct with his comments regarding throttle
operation. Also, the M14 is a dynamic counterweighted engine and as
such it is good operating practice to never let the propeller " drive "
the engine, particularly at high forward airspeed as the counterweight
bushings can become " detuned " , which means they get
Literally get hammered out of shape. I don't know how susceptible the
M14 is to this phenomenon but a reduction geared Lycoming is extremely
sensitive to it.
I think it is a bad assumption to think that the Russian throttle body
carburetor will not make carb. Ice. Here are the reasons I think it
can. There is a pressure drop
Across the carburetor venturi which, under high humidity conditions can
change water vapor to water in droplet form and some temperature
reduction takes place because of the expansion after the airflow leaves
the venturi. Shortly after this event, fuel is metered into the lower
pressure area and is evaporated. Evaporation is endothermic, which
means the temperature is lowered. Now we have liquid water at a reduced
temperature and if the reduced temperature is 32 dF, presto, carburetor
ice.
I have heard this same argument regarding the famous Bendix Pressure
Carbs. and I can testify that a PS-5 WILL make carburetor ice under the
above conditions.
My 2 pence
Monty Barrett
-----Original Message-----
From: owner-m14pengines-list-server@matronics.com
[mailto:owner-m14pengines-list-server@matronics.com] On Behalf Of John
Clayton
Sent: Friday, December 19, 2008 1:44 PM
Subject: RE: M14PEngines-List: Why would my Yak 52 m14p lose power?
Dennis
I would get hold of Jim Kimball Enterprises
http://www.jimkimballenterprises.com/web/index.php they have a mod that
you can do to the carb. that will probably take care of your problem.
John Clayton
Pitts Model 12 builder
09/03/00 MIXTURE CONTROL, ACCELERATOR PUMP MODS, STUMBLE
The mixture is not actually slaved to the throttle. It is controlled by
a barrometric pressure anneroid. This system senses the barr. press.
and sets the mixture accordingly. From 0 to 5000ft. it stays full rich.
>From 5000ft up it leans out. There is an accelerator pump curcuit that
is coupled to the throttle to ad extra fuel when the throttle is rapidly
advanced. This accell pump is the cause of the "stumble" that most
M-14Ps have when the throttle is pushed up after being at idle or near
idle for a while. This can be adjusted out with a series of different
needles etc to get it right for your condititions and piloting.
However, nobody does this and they live with the stumble. There is a
carb mod done here that we have done on our Model 12 and a few other
M-14Ps around here. It involves plugging this accell pump passage.
Very simple, and very effective. The throttle response on our 12 is
fantastic, like a dragster. KK
-----Original Message-----
From: owner-m14pengines-list-server@matronics.com
[mailto:owner-m14pengines-list-server@matronics.com]On Behalf Of George
Coy
Sent: Friday, December 19, 2008 5:53 AM
To: m14pengines-list@matronics.com
Subject: RE: M14PEngines-List: Why would my Yak 52 m14p lose
power?
Dennis,
As you know the M14P engine has a pressure carb. the fuel is
injected down stream of the venturii. It is very similar to a throttle
body injection system. As fuel is not evaporating in the low pressure
area (lower temperature area per Boyles law) by the venturi, the
pressure carburetor is almost immune to carb ice. (particularly in
Texas)
It is much more likely that the engine loaded up at reduced
throttle. Reading between the lines, the pilot admits he does not have
much experience with radial engines.
I always try to teach new guys to use a throttle reduction to
zero thrust rather than to completely pull the throttle back. If you
really need the dynamic braking of a idling engine, then at least
:CLEAR" the engine by periodically opening the throttle and clearing out
the loaded up spark plugs.
George Coy
________________________________
From: owner-m14pengines-list-server@matronics.com
[mailto:owner-m14pengines-list-server@matronics.com] On Behalf Of A.
Dennis Savarese
Sent: Friday, December 19, 2008 7:37 AM
To: m14pengines-list@matronics.com
Subject: Re: M14PEngines-List: Why would my Yak 52 m14p lose
power?
Sounds like it could very well be carb ice. I would remove and
inspect ALL fuel screens/filters including the one at the rear of the
carburetor just above the fuel inlet. It's a 22 mm nut.
Dennis
----- Original Message -----
From: markgreenway <mailto:geewhizmark@gmail.com>
To: m14pengines-list@matronics.com
Sent: Thursday, December 18, 2008 8:30 PM
Subject: M14PEngines-List: Why would my Yak 52 m14p lose
power?
<geewhizmark@gmail.com>
Hello Guys
Any idea why I lost power and had to make a forced
landing ,because when crossing midfield for landing, the motor lost
power when I throttled back. It never totally died and it regained power
once on the ground after a few minutes and then it powered up and ran
just fine?
It has some Les Crowder mods on it, and I am not sure if
those mods change the normal operations of the mp14.
I would ask Les Crowder if he were still with us. I
have been asking around and have had some great advice from some very
nice Yak people.
Just not sure if I am safe. I have been flying a Mooney
and a V-Tail, this is so different.
Now I am afraid to fly until I feel like I have found
the answer. It reminds me of a carb ice situation.
Who around the North Texas area would the right person
to pay to go through the motor and check things out for me?
Thanks so much
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=220084#220084
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