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06-26-2022, 12:04 PM
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Join Date: Oct 2011
Location: Québec, CNV9
Posts: 619
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Quote:
Originally Posted by roadrunner20
One other issue you need to be aware of if not done, will give you an elevated temp on #3. Not sure whether the instructions have been updated.
Make sure you add a washer between the #3 cylinder backside to the baffle. Without the washer, air can not pass over #3 and the back of the cylinder/baffle.
Someone on this list gave me the fix. I had been chasing this for quite some time. Once done, it lowered my #3 cht by 20-25 degrees.
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Yep, I put 3 washers there... #3 is now 30F cooler. Even cooler than #1.
I might remove 1 washer...
As for the Spark Plug holes, I used what Vans suggested and there was still a gap.
As I don't have to go through these holes to install/remove the plugs, I filled the gaps with Red RTV.
__________________
Eric,
2023 =VAF= paid
RV-8 SB #83274
Grove Airfoiled Gear, Wheels & Brakes
VPX-Pro, EFII System 32, EarthX batteries
Aerosport IO-375, MTV-9-B/183
Skyview HDX
C-GEMQ, RV-8, "Dragonfly", flying
C-GNFJ, C72R Cutlass, flying
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06-26-2022, 12:15 PM
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Join Date: Oct 2017
Location: Las Vegas, NV
Posts: 1,454
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Quote:
Originally Posted by riseric
Yep, I put 3 washers there... #3 is now 30F cooler. Even cooler than #1.
I might remove 1 washer...
As for the Spark Plug holes, I used what Vans suggested and there was still a gap.
As I don't have to go through these holes to install/remove the plugs, I filled the gaps with Red RTV.
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Don’t remove a washer.. get some aluminum foil tape and raise the front airdam on #1. Them if you need, you can also add some on #2 and really balance out the CHTs
__________________
Tom
Las Vegas
RV-4 flying…
RV-8 empenage finished 10-2020
Wings Started.. 11-2020
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06-26-2022, 12:53 PM
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Join Date: Sep 2010
Location: salon de provence France
Posts: 190
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Quote:
Originally Posted by philb
To enable you to put an extension on end of your socket to get the plug out...
At least on my 10, i can't fit a plug socket and the wrench inside of the baffle, need the extension through the hole, wrench on the outside.
Phil
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So you can inspect cylinder #3 or #4 top spark plug ? Ok .
But I prefer to close that hole, and without leakages .
Thanks
__________________
rv8
First flight february 11 th 2016 , delightfull....
Building a second RV8
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06-26-2022, 01:23 PM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 5,879
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Spark plug socket
I just looked at mine. My plug socket has a hex shaped end for a wrench. Used it many times in tight spaces. No need to try and fish an extension through those holes so I'm going to seal them.
__________________
Larry Larson
Estes Park, CO
E-mail: wirejock at yahoo dot com
Builder Blog: http://wirejockrv7a.blogspot.com
Donated 12/2022, plus a little extra.
RV-7A #73391, N511RV reserved
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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06-26-2022, 01:29 PM
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Join Date: Oct 2011
Location: Québec, CNV9
Posts: 619
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good suggestion
Quote:
Originally Posted by Taltruda
Don’t remove a washer.. get some aluminum foil tape and raise the front airdam on #1. Them if you need, you can also add some on #2 and really balance out the CHTs
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thanks Tom, good suggestion, I'll try that...
__________________
Eric,
2023 =VAF= paid
RV-8 SB #83274
Grove Airfoiled Gear, Wheels & Brakes
VPX-Pro, EFII System 32, EarthX batteries
Aerosport IO-375, MTV-9-B/183
Skyview HDX
C-GEMQ, RV-8, "Dragonfly", flying
C-GNFJ, C72R Cutlass, flying
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06-26-2022, 04:37 PM
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Join Date: Jan 2016
Location: Southwest, USA
Posts: 2,607
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aviation plugs
Quote:
Originally Posted by wirejock
I just looked at mine. My plug socket has a hex shaped end for a wrench. Used it many times in tight spaces. No need to try and fish an extension through those holes so I'm going to seal them.
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If one is using the aviation plugs, I think using a wrench on a plug socket is fine. But if one is using an automotive type plug, I think access through the baffle would prevent tweaking the plugs during install. (Of course removal of auto plugs doesn't matter, since we all throw them away after one use. Right??)
__________________
John S
WARNING! Information presented in this post is my opinion. All users of info have sole responsibility for determining accuracy or suitability for their use.
Dues paid 2023, worth every penny
RV9A- Status:
98% done, 2% left to go
To Go: wing mounting, engine baffles, wing tips, move to airport
www.pilotjohnsrv9.blogspot.com
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06-26-2022, 05:06 PM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 5,879
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Quote:
Originally Posted by PilotjohnS
If one is using the aviation plugs, I think using a wrench on a plug socket is fine. But if one is using an automotive type plug, I think access through the baffle would prevent tweaking the plugs during install. (Of course removal of auto plugs doesn't matter, since we all throw them away after one use. Right??)
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That's the plan although I have no idea what tweaking a plug means. 
I figure if I can R&R the plugs in the back two cylinders of a late model V8, I can get plugs in or out of my Lycoming. I can see those! The V8 requires me climbing up into the engine bay with a socket, universal, 6" extension and wratchet while cursing and praying the blasted things come out.That's after hopefully removing the coil pack in one piece. That rarely happens.
__________________
Larry Larson
Estes Park, CO
E-mail: wirejock at yahoo dot com
Builder Blog: http://wirejockrv7a.blogspot.com
Donated 12/2022, plus a little extra.
RV-7A #73391, N511RV reserved
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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06-29-2022, 09:39 PM
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Join Date: Jan 2005
Location: Cincinnati, OH
Posts: 2,522
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I just cut out a piece of baffle seal material slightly larger than the oval hole, punched a hole in the middle for the screw, and sandwiched it between the two washers to seal the opening completely. I have aviation plugs on mine, and may need those openings for wrench access.
__________________
SH
RV6/2001 built 2000/sold 2005
RV8 Fastback/2008 built/sold 2015
RV4/bought 2016/sold/2017
RV8/2018 built/Sold(sadly)
RV4/bought 2019/sold2021
RV6/August 2022 build - Flying
Cincinnati, OH/KHAO
DEC2022
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06-30-2022, 07:36 PM
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Join Date: Dec 2018
Location: Holmen
Posts: 74
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Being a simple guy, I just took some aluminum metal tape and taped a small piece over the hole on the inside of the baffle. I got tired of messing with the tinnerman washers and metal lock nut. At annual or whenever I need to look at one of the back plugs, I just pull off the tape. Then I put another piece on when I am done. Simple and a perfect complete seal.
Keith.
__________________
Keith in Lacrosse WI area
Finished Wittman Tailwind in 2016
Flew RV9A and RV6a while building
lurking for years but now paid
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