Today's Message Index:
----------------------
1. 04:41 AM - Re: carb ice (gary)
2. 04:47 AM - Re: 317 hours report (gary)
3. 08:08 AM - Re: 317 hours report (HINDE,FRANK (HP-Corvallis,ex1))
4. 08:27 AM - Re: 317 hours report (Bill Cardell)
5. 08:32 AM - Re: 317 hours report (HINDE,FRANK (HP-Corvallis,ex1))
6. 08:34 AM - Re: 317 hours report (Larry McFarland)
7. 08:35 AM - Re: 317 hours report (Bill Cardell)
8. 09:00 AM - Re: 317 hours report (HINDE,FRANK (HP-Corvallis,ex1))
9. 12:52 PM - Re: 317 hours report (Larry McFarland)
10. 03:48 PM - Re: 317 hours report (HINDE,FRANK (HP-Corvallis,ex1))
11. 04:01 PM - Ram heads with bigger valves (HINDE,FRANK (HP-Corvallis,ex1))
Message 1
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--> Stratus-List message posted by: "gary" <FlyinK@Efortress.com>
> Just wondering if I need to worry about carb ice with these Bing carbs.
> Not that I could ever do anything about it since I have no "carb heat" to
> apply...
>
I asked around quite a bit when I got mine (including the Bing and Rotax
booths at SNF) and the general consensus was like everyone said so far - not
a problem. They do sell electric, coolant and hot air based aftermarket
carb heat devices for the Bings but only to satisfy requirements (i.e.,
Canada?) or for use in extreme conditions.
gary
Message 2
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| Subject: | Re: 317 hours report |
--> Stratus-List message posted by: "gary" <FlyinK@Efortress.com>
thanks for the report Frank, good to know.
hopefully everybody knows to keep an eye on the engine mount - especially
the top right on the Zenith's. mine is different and doesn't have the long
un-triangulated part so hopefully it's not an issue.
my front bearing is weeping already, seems like it's going to be a common
replacement item.
how are you going to sync the carbs? i did a 1/16" drill bit under the
slides when adjusting the cables but that's a pretty crude method. It's
been fine, pretty smooth, but I'd like to try the vacuum sync if it's
supposed to be better and would get it even smoother.
gary
----- Original Message -----
From: "HINDE,FRANK (HP-Corvallis,ex1)" <frank.hinde@hp.com>
Subject: Stratus-List: 317 hours report
> --> Stratus-List message posted by: "HINDE,FRANK (HP-Corvallis,ex1)"
<frank.hinde@hp.com>
>
> Finally found the time to go take the cowling off the Stratus and found
the
> following.
>
> 1) Crack in RH upper engine mount, same place as others have found but
only
> about 1/4" long. Will make a reinforcing plate from a triangle of 1/8th
mild
> steel welded on top of the existing mount. I intend to gas weld this in
> place.
>
> 2) Prop bearing with almost imperceptable noise but pretty sure noise is
> coming from the bearings and not the seals. For $14 each it is a pretty
> simple job to replace them...The worse part is retensioning the belt...:)
>
> 3) Engine vibration at cruise was an imbalance in carb cable pull. I have
> know about this for a while because the EGT's were much higer on one side
> than the other at just above idle to 2000 rpm. The EGTS balanced at cruise
> however. Running the engine without prop revealed where the engine
roughness
> was coming from. I was glad it was not bearing noise from the engine...:)
>
> End of report!
>
> Frank 601 HDS 317 hours, Stratus with Ram heads
>
>
Message 3
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| Subject: | 317 hours report |
--> Stratus-List message posted by: "HINDE,FRANK (HP-Corvallis,ex1)" <frank.hinde@hp.com>
I have been thinking about that. In the past with motorcycle engines I have
had not very good results with "syncronisers". The problem always appeared
to be trying to set them up at idle (where vacuum is greatest) the different
times the piston would suck would send the readings all over the place.
It might be different with this motor though.
I don't have any better methods other than to set each cable so that both
throttle arms (one on each carb)are just pulled off the fully open stops at
the same time.
I do have an EGT on each exh pipe which "should" give the same reading on
each bank for the same throttle opening...Mine is way off and appears to be
pretty sensitive to imbalance just above idle. I might try setting the
cables to even out the difference and see how close the cables are.
What else is there to do on a Sunday afternoon right?...:)
Frank
-----Original Message-----
From: owner-stratus-list-server@matronics.com
[mailto:owner-stratus-list-server@matronics.com] On Behalf Of gary
Subject: Re: Stratus-List: 317 hours report
--> Stratus-List message posted by: "gary" <FlyinK@Efortress.com>
thanks for the report Frank, good to know.
hopefully everybody knows to keep an eye on the engine mount - especially
the top right on the Zenith's. mine is different and doesn't have the long
un-triangulated part so hopefully it's not an issue.
my front bearing is weeping already, seems like it's going to be a common
replacement item.
how are you going to sync the carbs? i did a 1/16" drill bit under the
slides when adjusting the cables but that's a pretty crude method. It's
been fine, pretty smooth, but I'd like to try the vacuum sync if it's
supposed to be better and would get it even smoother.
gary
----- Original Message -----
From: "HINDE,FRANK (HP-Corvallis,ex1)" <frank.hinde@hp.com>
Subject: Stratus-List: 317 hours report
> --> Stratus-List message posted by: "HINDE,FRANK (HP-Corvallis,ex1)"
<frank.hinde@hp.com>
>
> Finally found the time to go take the cowling off the Stratus and
> found
the
> following.
>
> 1) Crack in RH upper engine mount, same place as others have found but
only
> about 1/4" long. Will make a reinforcing plate from a triangle of
> 1/8th
mild
> steel welded on top of the existing mount. I intend to gas weld this
> in place.
>
> 2) Prop bearing with almost imperceptable noise but pretty sure noise
> is coming from the bearings and not the seals. For $14 each it is a
> pretty simple job to replace them...The worse part is retensioning the
> belt...:)
>
> 3) Engine vibration at cruise was an imbalance in carb cable pull. I
> have know about this for a while because the EGT's were much higer on
> one side than the other at just above idle to 2000 rpm. The EGTS
> balanced at cruise however. Running the engine without prop revealed
> where the engine
roughness
> was coming from. I was glad it was not bearing noise from the
> engine...:)
>
> End of report!
>
> Frank 601 HDS 317 hours, Stratus with Ram heads
>
>
advertising on the Matronics Forums.
Message 4
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| Subject: | 317 hours report |
--> Stratus-List message posted by: Bill Cardell <bill@flyinmiata.com>
Maybe you've got a binding slide?
Bill Cardell (TurboDog's Dad)
bill@flyinmiata.com
Flyin' Miata
1-800-359-6957 (sales only)
970-242-3800 (tech support)
http://flyinmiata.com
http://flyinprotege.com
-----Original Message-----
From: HINDE,FRANK (HP-Corvallis,ex1) [mailto:frank.hinde@hp.com]
Subject: RE: Stratus-List: 317 hours report
--> Stratus-List message posted by: "HINDE,FRANK (HP-Corvallis,ex1)"
<frank.hinde@hp.com>
I have been thinking about that. In the past with motorcycle engines I have
had not very good results with "syncronisers". The problem always appeared
to be trying to set them up at idle (where vacuum is greatest) the different
times the piston would suck would send the readings all over the place.
It might be different with this motor though.
I don't have any better methods other than to set each cable so that both
throttle arms (one on each carb)are just pulled off the fully open stops at
the same time.
I do have an EGT on each exh pipe which "should" give the same reading on
each bank for the same throttle opening...Mine is way off and appears to be
pretty sensitive to imbalance just above idle. I might try setting the
cables to even out the difference and see how close the cables are.
What else is there to do on a Sunday afternoon right?...:)
Frank
-----Original Message-----
From: owner-stratus-list-server@matronics.com
[mailto:owner-stratus-list-server@matronics.com] On Behalf Of gary
Subject: Re: Stratus-List: 317 hours report
--> Stratus-List message posted by: "gary" <FlyinK@Efortress.com>
thanks for the report Frank, good to know.
hopefully everybody knows to keep an eye on the engine mount - especially
the top right on the Zenith's. mine is different and doesn't have the long
un-triangulated part so hopefully it's not an issue.
my front bearing is weeping already, seems like it's going to be a common
replacement item.
how are you going to sync the carbs? i did a 1/16" drill bit under the
slides when adjusting the cables but that's a pretty crude method. It's
been fine, pretty smooth, but I'd like to try the vacuum sync if it's
supposed to be better and would get it even smoother.
gary
----- Original Message -----
From: "HINDE,FRANK (HP-Corvallis,ex1)" <frank.hinde@hp.com>
Subject: Stratus-List: 317 hours report
> --> Stratus-List message posted by: "HINDE,FRANK (HP-Corvallis,ex1)"
<frank.hinde@hp.com>
>
> Finally found the time to go take the cowling off the Stratus and
> found
the
> following.
>
> 1) Crack in RH upper engine mount, same place as others have found but
only
> about 1/4" long. Will make a reinforcing plate from a triangle of
> 1/8th
mild
> steel welded on top of the existing mount. I intend to gas weld this
> in place.
>
> 2) Prop bearing with almost imperceptable noise but pretty sure noise
> is coming from the bearings and not the seals. For $14 each it is a
> pretty simple job to replace them...The worse part is retensioning the
> belt...:)
>
> 3) Engine vibration at cruise was an imbalance in carb cable pull. I
> have know about this for a while because the EGT's were much higer on
> one side than the other at just above idle to 2000 rpm. The EGTS
> balanced at cruise however. Running the engine without prop revealed
> where the engine
roughness
> was coming from. I was glad it was not bearing noise from the
> engine...:)
>
> End of report!
>
> Frank 601 HDS 317 hours, Stratus with Ram heads
>
>
advertising on the Matronics Forums.
Message 5
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| Subject: | 317 hours report |
--> Stratus-List message posted by: "HINDE,FRANK (HP-Corvallis,ex1)" <frank.hinde@hp.com>
Nope, slides work great. It's the cables. It's a pretty hokey system that
appears to go out of adjustment from time to time. Most mutli carb installs
have a solid linkage between the carbs and a single cable. Unfortunatly that
would be hard to make work on this motor.
Frank
Do not archive.
-----Original Message-----
From: owner-stratus-list-server@matronics.com
[mailto:owner-stratus-list-server@matronics.com] On Behalf Of Bill Cardell
Subject: RE: Stratus-List: 317 hours report
--> Stratus-List message posted by: Bill Cardell <bill@flyinmiata.com>
Maybe you've got a binding slide?
Bill Cardell (TurboDog's Dad)
bill@flyinmiata.com
Flyin' Miata
1-800-359-6957 (sales only)
970-242-3800 (tech support)
http://flyinmiata.com
http://flyinprotege.com
-----Original Message-----
From: HINDE,FRANK (HP-Corvallis,ex1) [mailto:frank.hinde@hp.com]
Subject: RE: Stratus-List: 317 hours report
--> Stratus-List message posted by: "HINDE,FRANK (HP-Corvallis,ex1)"
<frank.hinde@hp.com>
I have been thinking about that. In the past with motorcycle engines I have
had not very good results with "syncronisers". The problem always appeared
to be trying to set them up at idle (where vacuum is greatest) the different
times the piston would suck would send the readings all over the place.
It might be different with this motor though.
I don't have any better methods other than to set each cable so that both
throttle arms (one on each carb)are just pulled off the fully open stops at
the same time.
I do have an EGT on each exh pipe which "should" give the same reading on
each bank for the same throttle opening...Mine is way off and appears to be
pretty sensitive to imbalance just above idle. I might try setting the
cables to even out the difference and see how close the cables are.
What else is there to do on a Sunday afternoon right?...:)
Frank
-----Original Message-----
From: owner-stratus-list-server@matronics.com
[mailto:owner-stratus-list-server@matronics.com] On Behalf Of gary
Subject: Re: Stratus-List: 317 hours report
--> Stratus-List message posted by: "gary" <FlyinK@Efortress.com>
thanks for the report Frank, good to know.
hopefully everybody knows to keep an eye on the engine mount - especially
the top right on the Zenith's. mine is different and doesn't have the long
un-triangulated part so hopefully it's not an issue.
my front bearing is weeping already, seems like it's going to be a common
replacement item.
how are you going to sync the carbs? i did a 1/16" drill bit under the
slides when adjusting the cables but that's a pretty crude method. It's
been fine, pretty smooth, but I'd like to try the vacuum sync if it's
supposed to be better and would get it even smoother.
gary
----- Original Message -----
From: "HINDE,FRANK (HP-Corvallis,ex1)" <frank.hinde@hp.com>
Subject: Stratus-List: 317 hours report
> --> Stratus-List message posted by: "HINDE,FRANK (HP-Corvallis,ex1)"
<frank.hinde@hp.com>
>
> Finally found the time to go take the cowling off the Stratus and
> found
the
> following.
>
> 1) Crack in RH upper engine mount, same place as others have found but
only
> about 1/4" long. Will make a reinforcing plate from a triangle of
> 1/8th
mild
> steel welded on top of the existing mount. I intend to gas weld this
> in place.
>
> 2) Prop bearing with almost imperceptable noise but pretty sure noise
> is coming from the bearings and not the seals. For $14 each it is a
> pretty simple job to replace them...The worse part is retensioning the
> belt...:)
>
> 3) Engine vibration at cruise was an imbalance in carb cable pull. I
> have know about this for a while because the EGT's were much higer on
> one side than the other at just above idle to 2000 rpm. The EGTS
> balanced at cruise however. Running the engine without prop revealed
> where the engine
roughness
> was coming from. I was glad it was not bearing noise from the
> engine...:)
>
> End of report!
>
> Frank 601 HDS 317 hours, Stratus with Ram heads
>
>
advertising on the Matronics Forums.
advertising on the Matronics Forums.
Message 6
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| Subject: | Re: 317 hours report |
--> Stratus-List message posted by: "Larry McFarland" <larrymc@qconline.com>
Frank,
I've been following your cable adjustment with great interest and have
locked both my Bing throttle arms with a link between them that does
the same thing "pull off the stops at the same time". This link is flexible
between the carbs but doesn't have any rotational flex and no adjustment
either.
Do these carbs vary in performance to any degree that would require I add
a fine adjustment to this rotational linkage? I like the solid cable link
to one carb
for positive control and was frustrated by my earlier twin throttle cable
hook up
but have I overlooked something here?
Larry McFarland 601HDS Stratus Images are at
www.macsmachine.com on the Subaru engine page and control linkages page if
necessary.
> I don't have any better methods other than to set each cable so that both
> throttle arms (one on each carb)are just pulled off the fully open stops
at
> the same time.
>
> I do have an EGT on each exh pipe which "should" give the same reading on
> each bank for the same throttle opening...Mine is way off and appears to
be
> pretty sensitive to imbalance just above idle. I might try setting the
> cables to even out the difference and see how close the cables are.
> Frank
Message 7
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| Subject: | 317 hours report |
--> Stratus-List message posted by: Bill Cardell <bill@flyinmiata.com>
My engine is still sitting on the floor with the heads off, so I haven't
looked too closely yet. Just a thought.
do not archive
Bill Cardell (TurboDog's Dad)
bill@flyinmiata.com
Flyin' Miata
1-800-359-6957 (sales only)
970-242-3800 (tech support)
http://flyinmiata.com
http://flyinprotege.com
-----Original Message-----
From: HINDE,FRANK (HP-Corvallis,ex1) [mailto:frank.hinde@hp.com]
Subject: RE: Stratus-List: 317 hours report
--> Stratus-List message posted by: "HINDE,FRANK (HP-Corvallis,ex1)"
<frank.hinde@hp.com>
Nope, slides work great. It's the cables. It's a pretty hokey system that
appears to go out of adjustment from time to time. Most mutli carb installs
have a solid linkage between the carbs and a single cable. Unfortunatly that
would be hard to make work on this motor.
Frank
Do not archive.
-----Original Message-----
From: owner-stratus-list-server@matronics.com
[mailto:owner-stratus-list-server@matronics.com] On Behalf Of Bill Cardell
Subject: RE: Stratus-List: 317 hours report
--> Stratus-List message posted by: Bill Cardell <bill@flyinmiata.com>
Maybe you've got a binding slide?
Bill Cardell (TurboDog's Dad)
bill@flyinmiata.com
Flyin' Miata
1-800-359-6957 (sales only)
970-242-3800 (tech support)
http://flyinmiata.com
http://flyinprotege.com
-----Original Message-----
From: HINDE,FRANK (HP-Corvallis,ex1) [mailto:frank.hinde@hp.com]
Subject: RE: Stratus-List: 317 hours report
--> Stratus-List message posted by: "HINDE,FRANK (HP-Corvallis,ex1)"
<frank.hinde@hp.com>
I have been thinking about that. In the past with motorcycle engines I have
had not very good results with "syncronisers". The problem always appeared
to be trying to set them up at idle (where vacuum is greatest) the different
times the piston would suck would send the readings all over the place.
It might be different with this motor though.
I don't have any better methods other than to set each cable so that both
throttle arms (one on each carb)are just pulled off the fully open stops at
the same time.
I do have an EGT on each exh pipe which "should" give the same reading on
each bank for the same throttle opening...Mine is way off and appears to be
pretty sensitive to imbalance just above idle. I might try setting the
cables to even out the difference and see how close the cables are.
What else is there to do on a Sunday afternoon right?...:)
Frank
-----Original Message-----
From: owner-stratus-list-server@matronics.com
[mailto:owner-stratus-list-server@matronics.com] On Behalf Of gary
Subject: Re: Stratus-List: 317 hours report
--> Stratus-List message posted by: "gary" <FlyinK@Efortress.com>
thanks for the report Frank, good to know.
hopefully everybody knows to keep an eye on the engine mount - especially
the top right on the Zenith's. mine is different and doesn't have the long
un-triangulated part so hopefully it's not an issue.
my front bearing is weeping already, seems like it's going to be a common
replacement item.
how are you going to sync the carbs? i did a 1/16" drill bit under the
slides when adjusting the cables but that's a pretty crude method. It's
been fine, pretty smooth, but I'd like to try the vacuum sync if it's
supposed to be better and would get it even smoother.
gary
----- Original Message -----
From: "HINDE,FRANK (HP-Corvallis,ex1)" <frank.hinde@hp.com>
Subject: Stratus-List: 317 hours report
> --> Stratus-List message posted by: "HINDE,FRANK (HP-Corvallis,ex1)"
<frank.hinde@hp.com>
>
> Finally found the time to go take the cowling off the Stratus and
> found
the
> following.
>
> 1) Crack in RH upper engine mount, same place as others have found but
only
> about 1/4" long. Will make a reinforcing plate from a triangle of
> 1/8th
mild
> steel welded on top of the existing mount. I intend to gas weld this
> in place.
>
> 2) Prop bearing with almost imperceptable noise but pretty sure noise
> is coming from the bearings and not the seals. For $14 each it is a
> pretty simple job to replace them...The worse part is retensioning the
> belt...:)
>
> 3) Engine vibration at cruise was an imbalance in carb cable pull. I
> have know about this for a while because the EGT's were much higer on
> one side than the other at just above idle to 2000 rpm. The EGTS
> balanced at cruise however. Running the engine without prop revealed
> where the engine
roughness
> was coming from. I was glad it was not bearing noise from the
> engine...:)
>
> End of report!
>
> Frank 601 HDS 317 hours, Stratus with Ram heads
>
>
advertising on the Matronics Forums.
advertising on the Matronics Forums.
Message 8
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| Subject: | 317 hours report |
--> Stratus-List message posted by: "HINDE,FRANK (HP-Corvallis,ex1)" <frank.hinde@hp.com>
Morning Larry,
It looks like you have two versions of throttle linkages one with two cables
and the other a solid/flex linkage?
You are certainy going to need an adjustment between each carb, but looking
at your linkage can you not slacken the screw in the collar on your linkage?
If you can adjust this way, it makes me a little nervous about what stops
this slipping in flight?
I think due to the flex mounting of the carbs any linkage is going to not be
perfect, as the throttle opening will vary slightly under the torque of the
engine. I think on balance though a sloid linkage is going to be more stable
than the twin cable set up.
Did you get Ram to re-do your heads?
Frank
Do not archive
-----Original Message-----
From: owner-stratus-list-server@matronics.com
[mailto:owner-stratus-list-server@matronics.com] On Behalf Of Larry
McFarland
Subject: Re: Stratus-List: 317 hours report
--> Stratus-List message posted by: "Larry McFarland"
--> <larrymc@qconline.com>
Frank,
I've been following your cable adjustment with great interest and have
locked both my Bing throttle arms with a link between them that does the
same thing "pull off the stops at the same time". This link is flexible
between the carbs but doesn't have any rotational flex and no adjustment
either. Do these carbs vary in performance to any degree that would require
I add
a fine adjustment to this rotational linkage? I like the solid cable link
to one carb
for positive control and was frustrated by my earlier twin throttle cable
hook up but have I overlooked something here?
Larry McFarland 601HDS Stratus Images are at www.macsmachine.com on the
Subaru engine page and control linkages page if necessary.
> I don't have any better methods other than to set each cable so that
> both throttle arms (one on each carb)are just pulled off the fully
> open stops
at
> the same time.
>
> I do have an EGT on each exh pipe which "should" give the same reading
> on each bank for the same throttle opening...Mine is way off and
> appears to
be
> pretty sensitive to imbalance just above idle. I might try setting the
> cables to even out the difference and see how close the cables are.
> Frank
advertising on the Matronics Forums.
Message 9
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| Subject: | Re: 317 hours report |
--> Stratus-List message posted by: "Larry McFarland" <larrymc@qconline.com>
Frank,
I left original pictures of the dual cables only for comparison with the
new flex-linkage. The new link end-plate holes are flat cut
to exactly fit the throttle shaft flats, but one can still flex the carbs on
their rubber.
The flex-link itself is absolutely rigid axially but bends easily to make
the angle between the carbs. In fact, the arc it makes doesn't change but
rotates nearly as a bent
solid tube might. It keeps the throttles exceptionally well aligned, but I
was most concerned that some
adjustment in rotation might be necessary between carbs to account for
differing performance between them. As you can guess, I'm not an "engine
guy" but most anxious to learn about these things.
My first run up was smooth, so I removed the engine and heads
as you've often advised, sent the heads off to RAM Performance and got the
guides and valves done.
One less thing to worry about. Need to do another run-up before hauling it
off to the airport as
it hasn't been started since the engine was reinstalled and the RAM heads
were put back on.
This area and the second P51-like air intake are the two complexities I've
tried to improve upon.
Got to fly it to proof it all tho.......
Thanks,
Larry
----- Original Message -----
From: "HINDE,FRANK (HP-Corvallis,ex1)" <frank.hinde@hp.com>
Subject: RE: Stratus-List: 317 hours report
> --> Stratus-List message posted by: "HINDE,FRANK (HP-Corvallis,ex1)"
<frank.hinde@hp.com>
>
> Morning Larry,
>
> It looks like you have two versions of throttle linkages one with two
cables
> and the other a solid/flex linkage?
>
> You are certainy going to need an adjustment between each carb, but
looking
> at your linkage can you not slacken the screw in the collar on your
linkage?
>
> If you can adjust this way, it makes me a little nervous about what stops
> this slipping in flight?
>
> I think due to the flex mounting of the carbs any linkage is going to not
be
> perfect, as the throttle opening will vary slightly under the torque of
the
> engine. I think on balance though a sloid linkage is going to be more
stable
> than the twin cable set up.
>
> Did you get Ram to re-do your heads?
>
> Frank
> Do not archive
Message 10
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| Subject: | 317 hours report |
--> Stratus-List message posted by: "HINDE,FRANK (HP-Corvallis,ex1)" <frank.hinde@hp.com>
Larry,
If your lucky your throttles will be perfectly aligned and won't need to be
adjusted. I have never seen a multi carbed engine however where ther is not
some way to diferentially adjust the carbs.
I would try it and see...I mean, if the throttles open and simultaneously
touch the open stops at the same time then I think you got it made.
You may end up with a slightly lumpy idle though because you will not be
able to fine tune the carbs at the place they are most effective...I.e where
the throttle plate is almost closed.
Suck it and see is my advice...even with a slightly lumpy idle it won't make
no difference as long as it is correct at cruise and full power...In fact
rough idling engines sound kinda cool....A bit like a dragster....:)
I did have another thought which I will post under another subject...
Frank
-----Original Message-----
From: owner-stratus-list-server@matronics.com
[mailto:owner-stratus-list-server@matronics.com] On Behalf Of Larry
McFarland
Subject: Re: Stratus-List: 317 hours report
--> Stratus-List message posted by: "Larry McFarland"
--> <larrymc@qconline.com>
Frank,
I left original pictures of the dual cables only for comparison with the new
flex-linkage. The new link end-plate holes are flat cut to exactly fit the
throttle shaft flats, but one can still flex the carbs on their rubber. The
flex-link itself is absolutely rigid axially but bends easily to make the
angle between the carbs. In fact, the arc it makes doesn't change but
rotates nearly as a bent solid tube might. It keeps the throttles
exceptionally well aligned, but I was most concerned that some adjustment
in rotation might be necessary between carbs to account for
Message 11
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| Subject: | Ram heads with bigger valves |
--> Stratus-List message posted by: "HINDE,FRANK (HP-Corvallis,ex1)" <frank.hinde@hp.com>
Hi guys,
When I had my heads done, Ron installed bigger valves and did some porting
work. Not expecting to do any extra work I did a static run up with the
plane tied to a post to check the carb mixture settings as per the Bing
service manual...Which I have since misplaced so if anyone wants to donate
me a photocpy for all the nice advice my employer allows me to type.....:)
Anyway, to my horror I found the carbs were set WAY too weak. Now
interestingly Stratus did claim that my heads had shown signs of overheating
which was another convenient "smoking gun" for them to explain why my valve
guides fell out for the third time.....But don't get me started....:)
It MAY be that my carbs were set up weak to begin with by Stratus, I have no
way of knowing 'cus I never checked the mixture prior to having Ram work on
the heads.
Anyway, bottom line is I had to increase my main jet by about two sizes and
my mid range jet went up quite a few sizes...Of course I can't remember by
how much, I do know it was an awful lot of time to get them right.
What I will do is check my paperwork this evening and confirm to this list
what jets I have in there, I will then write it in my maintenance log as
well!
So the moral is, if you have had this work done you really need to check
your jet sizes. Even though my plugs show correct colour I still see pretty
high EGT's like 1400F at cruise. I would hate to run this engine on the lean
side as these temps may be much higher leading to short engine life.
I will confirm what sizes tomorrow, but remember this is specific to MY
engine with bigger valves. You would still need to check yours.
Frank
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