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Go Back   VAF Forums > RV Firewall Forward Section > Traditional Aircraft Engines
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  #11  
Old 06-26-2022, 12:04 PM
riseric's Avatar
riseric riseric is offline
 
Join Date: Oct 2011
Location: Québec, CNV9
Posts: 593
Default

Quote:
Originally Posted by roadrunner20 View Post
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.

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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2022 =VAF= paid
RV-8 SB #83274
Grove Airfoiled Gear, Wheels & Brakes
VPX-Pro, EFII System 32, EarthX batteries
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  #12  
Old 06-26-2022, 12:15 PM
Taltruda Taltruda is offline
 
Join Date: Oct 2017
Location: Las Vegas, NV
Posts: 1,379
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Quote:
Originally Posted by riseric View Post
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.
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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Las Vegas
RV-4 flying…
RV-8 empenage finished 10-2020

Wings Started.. 11-2020
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  #13  
Old 06-26-2022, 12:53 PM
trackdom trackdom is offline
 
Join Date: Sep 2010
Location: salon de provence France
Posts: 190
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Quote:
Originally Posted by philb View Post
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
So you can inspect cylinder #3 or #4 top spark plug ? Ok .
But I prefer to close that hole, and without leakages .
Thanks
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  #14  
Old 06-26-2022, 01:23 PM
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wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 5,711
Default 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.
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Estes Park, CO
E-mail: wirejock at yahoo dot com
Builder Blog: http://wirejockrv7a.blogspot.com
Donated 12/01/2021, plus a little extra.
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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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  #15  
Old 06-26-2022, 01:29 PM
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riseric riseric is offline
 
Join Date: Oct 2011
Location: Québec, CNV9
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Default good suggestion

Quote:
Originally Posted by Taltruda View Post
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
thanks Tom, good suggestion, I'll try that...
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Eric,
2022 =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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  #16  
Old 06-26-2022, 04:37 PM
PilotjohnS PilotjohnS is offline
 
Join Date: Jan 2016
Location: Southwest, USA
Posts: 2,525
Default aviation plugs

Quote:
Originally Posted by wirejock View Post
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.
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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WARNING! Information presented in this post is my opinion. All users of info have sole responsibility for determining accuracy or suitability for their use.

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98% done, 2% left to go
To Go: wing mounting, engine baffles, wing tips, move to airport
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  #17  
Old 06-26-2022, 05:06 PM
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wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
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Quote:
Originally Posted by PilotjohnS View Post
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??)
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.
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Larry Larson
Estes Park, CO
E-mail: wirejock at yahoo dot com
Builder Blog: http://wirejockrv7a.blogspot.com
Donated 12/01/2021, 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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  #18  
Old 06-29-2022, 09:39 PM
Scott Hersha Scott Hersha is offline
 
Join Date: Jan 2005
Location: Cincinnati, OH
Posts: 2,424
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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.
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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
JAN2022
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  #19  
Old 06-30-2022, 07:36 PM
Tailwind/RVGuy Tailwind/RVGuy is offline
 
Join Date: Dec 2018
Location: Holmen
Posts: 63
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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.
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