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03-15-2016, 08:03 PM
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Join Date: Mar 2005
Location: Mansfield TX
Posts: 339
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Sealing Lower Inter-cylinder Baffles
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03-15-2016, 08:07 PM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,652
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Yep. I did the same thing on the Rocket. Dont be afraid to bend the tabs near the cylinder base nuts toward the barrel to tighten the gap a bit too. Speed tape and rtv go a long way toward sealing all these gaps.
__________________
WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
______________
Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
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03-15-2016, 08:24 PM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,516
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+1 me too. I sealed all the areas you show, and some more.
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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03-15-2016, 08:29 PM
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Join Date: Jan 2005
Posts: 3,646
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Quote:
Originally Posted by Toobuilder
Speed tape and rtv go a long way toward sealing all these gaps.
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What's speed tape, Mike? Is it something that holds up to heat pretty well?
__________________
Steve M.
Ellensburg WA
RV-9 Flying, 0-320, Catto
Donation reminder: Jan. 2021
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03-15-2016, 09:56 PM
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Join Date: Mar 2005
Location: Olathe, KS
Posts: 374
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Walter,
Turn the lights out until it's pitch black and shine a flashlight in between the cylinders and look underneath. Light will shine through the gaps. YOu'll be amazed at all the gaps that are there, and you want to seal them all.
All told, I seem to recall it made 10 or 12 degrees difference in CHT on my 7A.
Scott
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03-15-2016, 10:58 PM
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Join Date: Dec 2011
Location: Meridian ID, Aspen CO, Okemos MI
Posts: 2,645
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I am blown away that such small gaps make any difference at all. I have started my baffles and I will have a plenum and seeing threads like this make me wonder how I will ever get my plane finished. I had the fuselage and wings done before I knew there even were baffles!
Is it poor cooling that is the result of the leaks? Speed? Maybe a bit of both?
Thanks for the pictures. I can see these baffles are going to take more time than I guessed.
__________________
rockwoodrv9a
Williamston MI
O-320 D2A
Awaiting DAR Inspection
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03-16-2016, 06:48 AM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,652
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Quote:
Originally Posted by alpinelakespilot2000
What's speed tape, Mike? Is it something that holds up to heat pretty well?
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Also known as "300 MPH tape" or "mach tape", it is an aluminum foil with an adhesive that comes on a roll (like duct tape). It makes good temporary (and in some cases permanent) repairs to small holes in aircraft skin. I've seen some C-130's that seemed to be held together with the stuff. Quality varies, but the aircraft stuff is a fairly heavy guage and has great adhesive.
__________________
WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
______________
Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
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03-16-2016, 06:54 AM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,652
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Quote:
Originally Posted by rockwoodrv9
I am blown away that such small gaps make any difference at all. I have started my baffles and I will have a plenum and seeing threads like this make me wonder how I will ever get my plane finished. I had the fuselage and wings done before I knew there even were baffles!
Is it poor cooling that is the result of the leaks? Speed? Maybe a bit of both?
Thanks for the pictures. I can see these baffles are going to take more time than I guessed.
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If the air is going anywhere but through the fins or the oil cooler, it is costing you cooling and adding drag. It does not take much time to do the inner baffles - especially if the engine is still on the stand. The more "stuff" you add to the engine, the harder it gets.
__________________
WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
______________
Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
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03-16-2016, 07:19 AM
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Join Date: Jan 2005
Location: Ontario, Canada
Posts: 1,544
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A piece of flexible plastic tubing taped to the end of your caulking gun will help to get the RTV where it belongs.
__________________
Tom Martin RV1 pilot 4.6hours!
CPL & IFR rated
EVO F1 Rocket 1000 hours,
2010 SARL Rocket 100 race, average speed of 238.6 knots/274.6mph
RV4, RV7, RV10, two HRIIs and five F1 Rockets
RV14 Tail dragger
Fairlea Field
St.Thomas, Ontario Canada, CYQS
fairleafield@gmail.com
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03-16-2016, 08:06 AM
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Join Date: May 2010
Location: Concord, NC
Posts: 116
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Aluminum-colored silicone caulk from the home stores will fill gaps very well and blends with the engine color. It can also be used to make cylinder wraps by squeegeeing it into fiberglass cloth and cutting to size. Holds up well.
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