Today's Message Index:
----------------------
1. 12:04 AM - Re: Re: Ho Hum - Not! N8701 validates Zenith Design (Mike Allen)
2. 12:30 AM - Buying aluminium in Australia (Jugle)
3. 02:35 AM - Re: Buying aluminium in Australia (chris Sinfield)
4. 02:43 AM - Static ports (Dave Johnson)
5. 04:01 AM - Re: Static ports (DaveG601XL)
6. 04:04 AM - Re: Buying aluminium in Australia (Paul & Colleen Schelfhout)
7. 04:15 AM - Re: Re: Static ports (ZodieRocket)
8. 04:50 AM - Re: Buying aluminium in Australia (Peter W Johnson)
9. 06:45 AM - Re: Re: Ho Hum - Not! N8701 validates Zenith Design (burbby)
10. 07:00 AM - Backfire or Afterfire (george.mueller@aurora.org)
11. 07:46 AM - Re: Static ports ()
12. 07:52 AM - Burger and a Chat (4rcsimmons@comcast.net (Rich Simmons))
13. 07:53 AM - Re: Backfire or Afterfire (Jari Kaija (LapTop2))
14. 07:55 AM - Re: Backfire or Afterfire (Jari Kaija (LapTop2))
15. 09:04 AM - Re: Backfire or Afterfire (Kevin L. Rupert)
16. 09:40 AM - Re: Backfire or Afterfire (Robin Bellach)
17. 11:10 AM - Re: Backfire or Afterfire (Trainnut01@aol.com)
18. 12:08 PM - Re: Backfire or Afterfire (Crvsecretary@aol.com)
19. 12:41 PM - Re: Backfire or Afterfire (MacDonald Doug)
20. 12:48 PM - (no subject) (Kevin L. Rupert)
21. 01:06 PM - Re: Backfire or Afterfire (David Downey)
22. 01:07 PM - Re: Static ports (Terry Phillips)
23. 01:44 PM - Re: Static ports (Gig Giacona)
24. 01:49 PM - Re: (no subject) (Gig Giacona)
25. 03:26 PM - Re: Re: Static ports (Bill Naumuk)
26. 03:46 PM - Re: EA-81 Stratus Question -- Replacinig PSRU Bearings (Falcon)
27. 04:52 PM - Re: Backfire or Afterfire (n801bh@netzero.com)
28. 05:01 PM - Re: Backfire or Afterfire (JG)
29. 06:24 PM - Re: Re: Static ports (ZodieRocket)
30. 07:36 PM - New to list (Bob Sturgis)
31. 07:43 PM - Re: WW nose bowl disc (Bob Duns)
Message 1
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| Subject: | Re: Ho Hum - Not! N8701 validates Zenith Design |
Those are some great movies, Very effective, especially the landing.
What part of the country are you in? Looks like a beautiful area.
I plan to set up a VFR panel myself. Basic instruments, a radio and
transponder. I'm in Southern California, so the transponder is a must.
Thanks for the movies. I enjoyed them. You have built a great little
airplane.
I look forward to seeing your panel.
Mike
----- Original Message -----
From: "Tommy Walker" <twalker@cableone.net>
Sent: Monday, September 03, 2007 7:19 PM
Subject: Zenith-List: Re: Ho Hum - Not! N8701 validates Zenith Design
>
> Thanks Mike.
>
> Here are some links to pics and movies. We don't have a website with a
> lot of pictures though.
>
> http://myweb.cableone.net/twalker/8701.jpg
>
> http://myweb.cableone.net/twalker/Taxi_by.mpg
>
> http://myweb.cableone.net/twalker/takeoff.mpg
>
> http://myweb.cableone.net/twalker/land1.mpg
>
> You may have to open the movies within Windows Media Player.
>
> I will upload a picture of the panel this week. Our panel is strictly
> VFR.
>
> The interior is not complete. Hopefully soon.
>
> Tommy Walker in Alabama
> Do Not Archive
>
>
> Dirtbos wrote:
>> Nice work guys.
>>
>> I think the plane looks very clean just the way it is.
>>
>> I would appreciate some close up photos of the panel and interior (if
>> you can bring yourself to stop flying for awhile :D ).
>>
>> Do you have a bulders website?
>>
>> Mike
>
>
> --------
> Tommy Walker
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=132596#132596
>
>
>
Message 2
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| Subject: | Buying aluminium in Australia |
I've just got a quote for the sheets for my 601XL and the lead time on some thicknesses
is 10-12 weeks. I'd like to try and get it all in one go to save on freight.
Anyone out there recommend a supplier in Australia? I'm in East Gippsland,
Victoria.
Glenn.
--------
Glenn Andressen
601XL- just started.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=132623#132623
Message 3
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| Subject: | Re: Buying aluminium in Australia |
Hi
Where did you order from?
There are a few places on the east coast to buy from. Have you asked any of the
other victorian builders where they got theirs?
Give me an email off line at
sinfield(a)zeta.org.au
Chris Sinfield
Zodiac Xl
Jab 3300
Sydney.
PS we welcome another Aussie Xl builder..
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=132628#132628
Message 4
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I am planning on fitting the Dynon AOA Pitot head to the 601XL. This
does not have a static port, so I will fit ports on either side of the
fuselage.
I understand the location is critical, so does anyone know where I
should put them (practical suggetsions only - this is a family list!!).
I have tried the obvious line of e-mailing Zenith, but no response at
all.
Dave Johnson
CH601XL form a CZAW kit
Message 5
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| Subject: | Re: Static ports |
Dave,
I asked this very question to ZAC at their Oshkosh booth this year. Nick said
the location of a static port was not all that critical. The suggestion was on
the fuselage side aft of the wing.
Good luck,
--------
David Gallagher
601 XL, tail and wings completed,
fueslage almost done, engine next.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=132634#132634
Message 6
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| Subject: | Re: Buying aluminium in Australia |
G'day All,
I found Airport Metals (Melbourne) to be fine - and they carried a full
range for 6061 and had the best prices at the time (18 months ago) - Good
luck.
PS: I have their product listing in pdf format if that helps
Paul Schelfhout
CH701 - Cabin & fwd to go & really would like a turbo diesel up front, any
thoughts welcome
Do not archive
----- Original Message -----
From: "Jugle" <glenn@eastcoastit.net>
Sent: Tuesday, September 04, 2007 3:29 PM
Subject: Zenith-List: Buying aluminium in Australia
>
> I've just got a quote for the sheets for my 601XL and the lead time on
> some thicknesses is 10-12 weeks. I'd like to try and get it all in one go
> to save on freight. Anyone out there recommend a supplier in Australia?
> I'm in East Gippsland, Victoria.
>
> Glenn.
>
> --------
> Glenn Andressen
> 601XL- just started.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=132623#132623
>
>
>
Message 7
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| Subject: | Re: Static ports |
Measurement I use in 150mm down from the upper longerons and 150 mm back
from the firewall rivet line. Ensure to install two, one on either side
of cabin.
Mark Townsend Alma, Ontario
Zodiac 601XL C-GOXL, CH701 just started
www.ch601.org / www.ch701.com / www.Osprey2.com
-----Original Message-----
I asked this very question to ZAC at their Oshkosh booth this year.
Nick said the location of a static port was not all that critical. The
suggestion was on the fuselage side aft of the wing.
Good luck,
9:31 AM
Message 8
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| Subject: | Buying aluminium in Australia |
Glenn,
Try H-Aircraft Spares in Moorabbin:-
H-Aircraft Spares P/L
P.O. Box 503
Braeside 3195
Unit 8/63-65 Voltri Street,
Mentone 3194. (opp the Moorabbin Airport)
03 9585 0941 tele
03 9585 0942 fax
Cheers
Peter
Wonthaggi, Vic
-----Original Message-----
From: owner-zenith-list-server@matronics.com
[mailto:owner-zenith-list-server@matronics.com] On Behalf Of Jugle
Sent: Tuesday, 4 September 2007 5:29 PM
Subject: Zenith-List: Buying aluminium in Australia
I've just got a quote for the sheets for my 601XL and the lead time on some
thicknesses is 10-12 weeks. I'd like to try and get it all in one go to save
on freight. Anyone out there recommend a supplier in Australia? I'm in East
Gippsland, Victoria.
Glenn.
--------
Glenn Andressen
601XL- just started.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=132623#132623
9:31 AM
9:31 AM
Message 9
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| Subject: | Re: Ho Hum - Not! N8701 validates Zenith Design |
Nice looking 701 .
Its probly my computer but i had to open the movies with Quick time.
Nicely done and your plane looks great.
Thanks
Gary
---------------------------------
Pinpoint customers who are looking for what you sell.
Message 10
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| Subject: | Backfire or Afterfire |
I am at the point of doing full power run-ups with my Zenith 701 with a
rotax 912 UL 80hp installed with a Skyshops firewall forward kit. When I
do a full power run up, I get a backfire (or afterfire maybe) after I turn
the ignition key to "off". When I taxi around keeping the engine to
around 2,000 rpm, this does not happen after shutdown, only after I do a
full power run-up. Everything else seems normal as far as I can tell, the
engine starts really well, seems to run smoothly, idles well. But after
doing three full power run ups, I have had three backfires, all after
turning off the ignition. Does anyone on the list have an idea about what
might be causing this?
George in Milwaukee
701 912UL
Message 11
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| Subject: | Re: Static ports |
Why not install the Zenith supplied combo pitot and static source on the same or
the other wing? The pitot could be valved to provide an alternate incase the
Dynon pitot eats a bug or something. Seems easier than researching a good static
point on the fuselage.
Dred
---- Dave Johnson <david_a_g_johnson@btinternet.com> wrote:
> I am planning on fitting the Dynon AOA Pitot head to the 601XL. This does not
have a static port, so I will fit ports on either side of the fuselage.
>
> I understand the location is critical, so does anyone know where I should put
them (practical suggetsions only - this is a family list!!).
>
> I have tried the obvious line of e-mailing Zenith, but no response at all.
>
> Dave Johnson
>
> CH601XL form a CZAW kit
Message 12
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| Subject: | Burger and a Chat |
Hey folks,
I have a total of 7 people interested in visiting the Jabaru USA shop in Shelbyville,
TN.
It is right at the airport if
They package the Firewall forward kits for the 601 and the 701.
If anyone else is interested please let me know some time this week.
After this week, I will set a time.
Do not Archive
--
Thanks,
Rich Simmons
601XL Fuselage - Firewall stiffners
Message 13
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| Subject: | Re: Backfire or Afterfire |
You are doing WHAT! Turning off ignition, while engine runs at maximum
speed?
What kind of test is this? Newer heard and I have quite a lott of
experience with
single piston aeroplanes, since I got my PPL license -96!
Don't destroy your engine.
Think a while! When you turn ignition off and engine have such kind of
rpm. All gasoline/air mix will flow to muffler, because that mix didn't
blow out in the cylinders. And muffler, when there is enough gas/air mix
in a hot "steel botle", WILL catch fire!!!!
----- Original Message -----
From: george.mueller@aurora.org
To: zenith-list@matronics.com
Sent: Tuesday, September 04, 2007 4:58 PM
Subject: Zenith-List: Backfire or Afterfire
I am at the point of doing full power run-ups with my Zenith 701 with
a rotax 912 UL 80hp installed with a Skyshops firewall forward kit.
When I do a full power run up, I get a backfire (or afterfire maybe)
after I turn the ignition key to "off". When I taxi around keeping the
engine to around 2,000 rpm, this does not happen after shutdown, only
after I do a full power run-up. Everything else seems normal as far as
I can tell, the engine starts really well, seems to run smoothly, idles
well. But after doing three full power run ups, I have had three
backfires, all after turning off the ignition. Does anyone on the list
have an idea about what might be causing this?
George in Milwaukee
701 912UL
Message 14
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| Subject: | Re: Backfire or Afterfire |
...or did you mention fire in the carburetor's intake?
Message 15
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| Subject: | Re: Backfire or Afterfire |
Mr. Pilot,
Ever hear of *AD 76-07-12*,* BENDIX IGNITION SWITCHES?
*KLR*
*
Message 16
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| Subject: | Re: Backfire or Afterfire |
I believe he clearly said "AFTER I do a full power run-up," not DURING.
Do not archive.
----- Original Message -----
From: Jari Kaija (LapTop2)
To: zenith-list@matronics.com
Sent: Tuesday, September 04, 2007 9:52 AM
Subject: Re: Zenith-List: Backfire or Afterfire
You are doing WHAT! Turning off ignition, while engine runs at maximum
speed?
What kind of test is this? Newer heard and I have quite a lott of
experience with
single piston aeroplanes, since I got my PPL license -96!
Don't destroy your engine.
Think a while! When you turn ignition off and engine have such kind of
rpm. All gasoline/air mix will flow to muffler, because that mix
didn't
blow out in the cylinders. And muffler, when there is enough gas/air
mix
in a hot "steel botle", WILL catch fire!!!!
----- Original Message -----
From: george.mueller@aurora.org
To: zenith-list@matronics.com
Sent: Tuesday, September 04, 2007 4:58 PM
Subject: Zenith-List: Backfire or Afterfire
I am at the point of doing full power run-ups with my Zenith 701
with a rotax 912 UL 80hp installed with a Skyshops firewall forward kit.
When I do a full power run up, I get a backfire (or afterfire maybe)
after I turn the ignition key to "off". When I taxi around keeping the
engine to around 2,000 rpm, this does not happen after shutdown, only
after I do a full power run-up. Everything else seems normal as far as
I can tell, the engine starts really well, seems to run smoothly, idles
well. But after doing three full power run ups, I have had three
backfires, all after turning off the ignition. Does anyone on the list
have an idea about what might be causing this?
George in Milwaukee
701 912UL
href="http://www.matronics.com/Navigator?Zenith-List">http://www.matron
href="http://forums.matronics.com">http://forums.matronics.com
Message 17
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| Subject: | Re: Backfire or Afterfire |
When I was involved with Nascar during the eighties several times during
each weeks testing we would do a "Plug check" The procedure required the driver
to run several hot laps, then right at the end of the back straight he would
turn off the ignition (at full throttle), take the car out of gear, and
coast to the pits. The crew would then push the car back to the garage, quickly
remove the sparks plugs and rush them to the Champion Spark Plug trailer to
have them "read" by the Champion Rep. The plugs were then returned to us with
notations as to which ones should have gaskets added and which ones should have
gaskets removed. Apparently the plug temp can be controlled by gasket
thickness. I did not understand this at the time (not in my job description) and
I
don't understand it now but I do know that cutting the ignition at full
throttle told somebody something.
Carroll
do not archive
http://discover.aol.com/memed/aolcom30tour
Message 18
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| Subject: | Re: Backfire or Afterfire |
I've heard of this procedure to check the size of the main jet in the
carburator and the heat range of the plug. Adding & removing gaskets might change
the amount of heat the plug can shed to the cylinder head, but typically heat
range is built into the plug.
Tracy Smith
Naugatuck, CT
Do Not Archive
In a message dated 9/4/2007 1:11:10 PM Eastern Standard Time,
Trainnut01@aol.com writes:
When I was involved with Nascar during the eighties several times during
each weeks testing we would do a "Plug check" The procedure required the driver
to run several hot laps, then right at the end of the back straight he would
turn off the ignition (at full throttle), take the car out of gear, and
coast to the pits. The crew would then push the car back to the garage, quickly
remove the sparks plugs and rush them to the Champion Spark Plug trailer to
have them "read" by the Champion Rep. The plugs were then returned to us with
notations as to which ones should have gaskets added and which ones should
have gaskets removed. Apparently the plug temp can be controlled by gasket
thickness. I did not understand this at the time (not in my job description) and
I
don't understand it now but I do know that cutting the ignition at full
throttle told somebody something.
Carroll
do not archive
http://discover.aol.com/memed/aolcom30tour
Message 19
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| Subject: | Re: Backfire or Afterfire |
George, I have a similar set up but am still about six
months away from run-ups. That being said, sounds
like you could have a mixture issue (running rich and
loading up the exhust with unburned fuel) but I would
be more suspicious of fuel quality. Maybe try a
different souce for your fuel. Might be stale fuel or
something.
Food for thought at least.
Doug MacDonald
CH-701 Scratch Builder, 912 UL
NW Ontario, Canada
Working on throttle assy.
--- george.mueller@aurora.org wrote:
> I am at the point of doing full power run-ups with
> my Zenith 701 with a
> rotax 912 UL 80hp installed with a Skyshops firewall
> forward kit. When I
> do a full power run up, I get a backfire (or
> afterfire maybe) after I turn
> the ignition key to "off". When I taxi around
> keeping the engine to
> around 2,000 rpm, this does not happen after
> shutdown, only after I do a
> full power run-up. Everything else seems normal as
> far as I can tell, the
> engine starts really well, seems to run smoothly,
> idles well. But after
> doing three full power run ups, I have had three
> backfires, all after
> turning off the ignition. Does anyone on the list
> have an idea about what
> might be causing this?
>
>
> George in Milwaukee
> 701 912UL
Message 20
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|
I know this has nothing to do with Corvairs but I found it interesting
reading and thought the list might too.
Kevin R.
C/XL
Message 21
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| Subject: | Re: Backfire or Afterfire |
The only way to get an accurate and readable color condition on the plug is
to shut down at high throttle. Allowing the engine to come down through th
e rpm and power bands will contaminate the purity og the data to be extract
ed by "reading" the plugs. I am fascinated by the gasket shifting though; w
hat was being learned/accomplished there?=0A =0ADave Downey=0AHarleysville
(SE) PA=0A100 HP Corvair=0A=0A=0A=0A----- Original Message ----=0AFrom: "Cr
vsecretary@aol.com" <Crvsecretary@aol.com>=0ATo: zenith-list@matronics.com
=0ASent: Tuesday, September 4, 2007 3:07:02 PM=0ASubject: Re: Zenith-List:
Backfire or Afterfire=0A=0A=0AI've heard of this procedure to check the siz
e of the main jet in the carburator and the heat range of the plug. Adding
& removing gaskets might change the amount of heat the plug can shed to th
e cylinder head, but typically heat range is built into the plug.=0A =0ATra
cy Smith=0ANaugatuck, CT=0ADo Not Archive=0A =0A =0A =0AIn a message dated
9/4/2007 1:11:10 PM Eastern Standard Time, Trainnut01@aol.com writes:=0AWhe
n I was involved with Nascar during the eighties several times during each
weeks testing we would do a "Plug check" The procedure required the driver
to run several hot laps, then right at the end of the back straight he wou
ld turn off the ignition (at full throttle), take the car out of gear, and
coast to the pits. The crew would then push the car back to the garage, qui
ckly remove the sparks plugs and rush them to the Champion Spark Plug trail
er to have them "read" by the Champion Rep. The plugs were then returned to
us with notations as to which ones should have gaskets added and which one
s should have gaskets removed. Apparently the plug temp can be controlled b
y gasket thickness. I did not understand this at the time (not in my job de
scription) and I don't understand it now but I do know that cutting the ign
ition at full throttle told somebody something.=0ACarroll=0A =0Ado not arch
===0A=0A=0A =0A__________________________________________________
__________________________________=0ANeed a vacation? Get great deals=0Ato
amazing places on Yahoo! Travel.=0Ahttp://travel.yahoo.com/
Message 22
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| Subject: | Re: Static ports |
Dave
I am planning on using the Dynon AOA Pitot also and using the dual static
port kit from Van's ($19). I hope you'll post a photo or two of the pitot
installation after you get it in and working. I'm thinking of adding in the
surplus differential pressure gage that is commonly used as an LRI idicator
and using the Dynon EFIS to calibrate a scale for the gage. (I'm paranoid
about failures of electronic gear and like analog backups.)
Terry
At 10:42 AM 9/4/2007 +0100, you wrote:
>I am planning on fitting the Dynon AOA Pitot head to the 601XL. This does
>not have a static port, so I will fit ports on either side of the fuselage.
>
>I understand the location is critical, so does anyone know where I should
>put them (practical suggetsions only - this is a family list!!).
>
>I have tried the obvious line of e-mailing Zenith, but no response at all.
>
>Dave Johnson
>
>CH601XL form a CZAW kit
Terry Phillips
ttp44~at~rkymtn.net
Corvallis MT
601XL/Jab 3300 slow build kit - Rudder done--finally; working on the stab
http://www.mykitlog.com/N47TP/
Message 23
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| Subject: | Re: Static ports |
DrEd, that's a great idea IF you didn't seal up the wings 3 years ago.
Terry, A back-up for the AOA really? While nice it is hardly even bordering on
critical.
Mark, Thanks. I've been looking for a place to put the static ports in for the
exact same reason as Dave.
--------
W.R. "Gig" Giacona
601XL Under Construction
See my progress at www.peoamerica.net/N601WR
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=132754#132754
Message 24
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| Subject: | Re: (no subject) |
Well what do you know. The FAA does care about us Auto Coversion guys.
--------
W.R. "Gig" Giacona
601XL Under Construction
See my progress at www.peoamerica.net/N601WR
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=132755#132755
Message 25
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| Subject: | Re: Static ports |
Zodie-
What if they're integral with the pitot? Per Zenith, the attached.
Bill Naumuk
HDS Fuse/Corvair
Townville, Pa
----- Original Message -----
From: "ZodieRocket" <zodierocket@hsfx.ca>
Sent: Tuesday, September 04, 2007 7:14 AM
Subject: RE: Zenith-List: Re: Static ports
>
> Measurement I use in 150mm down from the upper longerons and 150 mm back
> from the firewall rivet line. Ensure to install two, one on either side
> of cabin.
>
> Mark Townsend Alma, Ontario
> Zodiac 601XL C-GOXL, CH701 just started
> www.ch601.org / www.ch701.com / www.Osprey2.com
>
> -----Original Message-----
> I asked this very question to ZAC at their Oshkosh booth this year.
> Nick said the location of a static port was not all that critical. The
> suggestion was on the fuselage side aft of the wing.
>
> Good luck,
>
>
>
> 9:31 AM
>
>
>
>
>
>
Message 26
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| Subject: | Re: EA-81 Stratus Question -- Replacinig PSRU Bearings |
Larry Macfarland caught up with me on the Stratus list. Thanks everyone!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=132775#132775
Message 27
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| Subject: | Re: Backfire or Afterfire |
I drove those things back in the eighties and also built a few motors fo
r them too. I read my own plugs to determine fuel mixture but more crit
ical was looking for proper ignition timing. I still do it every few mon
ths as my plane has a NASCAR style motor in it. It took me a couple of t
imes of explaining to the control tower why I would actually shut off a
good running motor about half way down the runway at full throttle. <G>
The backfire is caused by unburned fuel in the exhaust system, it is lit
off by either the glowing exhaust valves or some real hot carbon build
up in the pipes. All well built engines are dyno run before they get to
the track and changing plug gaskets will "index"the ground strap on the
plug to get optimal combustion. The slight difference in fuel mixture be
tween cylinders is usually tweaked during flow testing of the intake man
ifold and intake ports on a flow bench, this happens before the motor is
assembledAfter reading the plugs I would determine if the timing is corr
ect, then I would make a jet change if needed and as a last result I wou
ld make a spark plug heat range change.If the original poster would let
the motor cool a few minutes before shutting off the ignition it will pr
obably not backfire.
Do not archive
When I was involved with Nascar during the eighties several times during
each weeks testing we would do a "Plug check" The procedure required t
he driver to run several hot laps, then right at the end of the back str
aight he would turn off the ignition (at full throttle), take the car ou
t of gear, and coast to the pits. The crew would then push the car back
to the garage, quickly remove the sparks plugs and rush them to the Cham
pion Spark Plug trailer to have them "read" by the Champion Rep. The plu
gs were then returned to us with notations as to which ones should have
gaskets added and which ones should have gaskets removed. Apparently the
plug temp can be controlled by gasket thickness. I did not understand t
his at the time (not in my job description) and I don't understand it no
w but I do know that cutting the ignition at full throttle told somebody
something.Carroll do not archive
The only way to get an accurate and readable color condition on the plu
g is to shut down at high throttle. Allowing the engine to come down thr
ough the rpm and power bands will contaminate the purity og the data to
be extracted by "reading" the plugs. I am fascinated by the gasket shift
ing though; what was being learned/accomplished there?
Dave DowneyHarleysville (SE) PA100 HP Corvair
========================
========================
========================
========================
========================
=============
Message 28
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| Subject: | Re: Backfire or Afterfire |
And make certain the throttle is held completely closed and the idle
slowed right down.
Do not archive.
JG
----- Original Message -----
From: n801bh@netzero.com
To: zenith-list@matronics.com
Sent: Wednesday, September 05, 2007 9:50 AM
Subject: Re: Zenith-List: Backfire or Afterfire
I drove those things back in the eighties and also built a few motors
for them too. I read my own plugs to determine fuel mixture but more
critical was looking for proper ignition timing. I still do it every few
months as my plane has a NASCAR style motor in it. It took me a couple
of times of explaining to the control tower why I would actually shut
off a good running motor about half way down the runway at full
throttle. <G> The backfire is caused by unburned fuel in the exhaust
system, it is lit off by either the glowing exhaust valves or some real
hot carbon build up in the pipes. All well built engines are dyno run
before they get to the track and changing plug gaskets will "index"the
ground strap on the plug to get optimal combustion. The slight
difference in fuel mixture between cylinders is usually tweaked during
flow testing of the intake manifold and intake ports on a flow bench,
this happens before the motor isassembledAfter reading the plugs I would
determine if the timing is correct, then I would make a jet change if
needed and as a last result I would make a spark plug heat range
change.If the original poster would let the motor cool a few minutes
before shutting off the ignition it will probably not backfire.
Do not archive
When I was involved with Nascar during the eighties several times
during each weeks testing we would do a "Plug check" The procedure
required the driver to run several hot laps, then right at the end of
the back straight he would turn off the ignition (at full throttle),
take the car out of gear, and coast to the pits. The crew would then
push the car back to the garage, quickly remove the sparks plugs and
rush them to the Champion Spark Plug trailer to have them "read" by the
Champion Rep. The plugs were then returned to us with notations as to
which ones should have gaskets added and which ones should have gaskets
removed. Apparently the plug temp can be controlled by gasket thickness.
I did not understand this at the time (not in my job description) and I
don't understand it now but I do know that cutting the ignition at full
throttle told somebody something.
Carroll
do not archive
The only way to get an accurate and readable color condition
on the plug is to shut down at high throttle. Allowing the engine to
come down through the rpm and power bands will contaminate the purity og
the data to be extracted by "reading" the plugs. I am fascinated by the
gasket shifting though; what was being learned/accomplished there?
Dave Downey
Harleysville (SE) PA
100 HP Corvair
-------------------------------------------------------------------------
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href="http://discover.aol.com/memed/aolcom30tour/?ncid=AOLAOF00020000
000982" target=_blank>AOL.com.
">http://www.matronics.com/Navigator?Zenith-List
tronics.com
Message 29
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| Subject: | Re: Static ports |
That will work just fine Bill. The fuselage mount is for those who only
have a Pitot tube only. Or an AOA.
Mark Townsend
Can-Zac Aviation Ltd.
president@can-zacaviation.com
www.can-zacaviation.com
-----Original Message-----
Zodie-
What if they're integral with the pitot? Per Zenith, the attached.
Bill Naumuk
HDS Fuse/Corvair
Townville, Pa
----- Original Message -----
9:14 AM
Message 30
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Hi, I am bobefx in southern California. I am building a 601XL QB kit. I have the
rudder, horz stab, elevator, left wing and landing gear done. I found some things
that I am concerned about in the kit.
1. The fuel tank vent and quick drain holes in the leading edge skin did not
line up with the tank. Any one had that problem?
2. The elevator stops were placed right next to the elevator hole, in the way
of the bolt and nut to operate the elevator. Any one had that problem?
3. Some holes were smaller than they should have been to accept the rivet, and
others were elongated. It seems that Zenith has a quality control problem.
Has anyone had any problems with their QB kit and if so what?
Thank you
Bob
Message 31
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| Subject: | Re: WW nose bowl disc |
Jeff:
I too am planning to build my own nosebowl for 601HD/Corvair and am very much interested
in your specs. The pics were great but measurements would sure help,
also materials list used. The measurements that I found on WW website were
minimal. Thanks.
Bob D.
Melfort, SK
601HD/Corvair
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