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Old 09-17-2019, 05:45 AM
SteveR SteveR is offline
Join Date: Dec 2006
Location: Hudson Oaks, TX
Posts: 24
Default Need opinions - insulation wrap in engine bay

I'd like to get thoughts on the pictures below. This is 2,000 degree insulation wrapped around exhaust and an oil cooler tube. My concern is that this will be a fire hazard as the insulation gets coated in oil over time.

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Old 09-17-2019, 08:31 AM
kaweeka kaweeka is offline
Join Date: May 2011
Location: Roseville
Posts: 350

This is from Vetterman's website. It may not directly answer your question but it's worth considering if you are unsure about the wrap. I don't know what your exhaust is constructed from and I am definitely NOT an engineer but take the advice from trusted sources seriously.

"Any material on the exhaust will shorten it's life and failure will occur. We are using air cooled engines and one the best heat sinks on the engine is the exhaust system. The mass air flow comes in and is forced down and around the cooling fins and then is directed over the exhaust system and then exited out the bottom. If the exhaust is covered it cannot aid in the cooling process. Our tests show that any type of wrap on the exhaust makes both the cylinder head and exhaust temperature run higher. The stainless steel used (type 321) will degrade if the surface temperature is over 1250 degrees F. We also did not find a power increase of any kind by wrapping the exhaust"

RV-9A N435KR, Vans calendar March 2018
LIO 320 B1A, Dual LS Plasma III, AFP injection
G3x touch
Roseville, Ca
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Old 09-20-2019, 06:59 AM
Red Mtn flyer Red Mtn flyer is offline
Join Date: Jul 2017
Location: Carson City, NV
Posts: 108
Default concur

worst placement of 'insulation' is around the exhaust -- it will shorten life [constant temperature swings means precipitation of moisture, retention of heat, etc.], makes visual inspection essentially impossible... a pinhole through the pipe into the wrap and what do you have??? - a mess, if you're lucky.
Vetterman's thoughts are 'right on' -- use the airflow to cool.
Ben K.
A&P; RLSA - A,G,W/S Falco F-8L
50 yrs of flight and counting
Dues paid 2017 thru 2020
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Old 09-20-2019, 07:16 AM
terrykohler terrykohler is offline
Join Date: Jan 2005
Posts: 1,005
Default Are Those Plastic Zip Ties????

Wrapped around an exhaust pipe? If so, I'd have a verrrrry careful inspection done of the entire aircraft. They're likely to be other surprises.
Terry, CFI
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Old 09-20-2019, 08:06 AM
DennisRhodes DennisRhodes is offline
Join Date: Jul 2007
Location: Taylorsville, Ga
Posts: 751

A lot of LongEZ flyers used wrap around the exhaust pipe to "help" with the CHT since the cooling in most EZs is updraft. The results WERE a shortened life on the stainless or other exhaust material, mine included. In an EZ anything that broke and got out of the cowl went thru the prop!! Wrap for that service presented a whole new level of inspection in that aircraft. The good news was that a cracked exhaust usually stayed in the cowl held by the wrap and wire until inspection revealed the exhaust leak . Exhaust Wrap not a good idea.
2020 VAF Supporter
RV9 N908DR
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Old 09-20-2019, 08:07 AM
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airguy airguy is offline
Join Date: Oct 2006
Location: Garden City, Tx
Posts: 4,952

Aside from the points already made about this being a very bad idea, I have to laugh a bit at the PLASTIC tie-wraps used on the exhaust insulation...
Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid
N16GN flying 600 hrs and counting! IO360, SDS, WWRV200, Dynon glass, 430W
Built an off-plan KC9A with too much fuel and too much HP. Should drop dead any minute now.
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Old 09-20-2019, 11:43 AM
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DanH DanH is offline
Join Date: Oct 2005
Location: 08A
Posts: 9,197

Plenty of RV-relevant content here.
Dan Horton
Barrett IO-390
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Old 09-20-2019, 11:55 AM
rocketman1988 rocketman1988 is offline
Join Date: Jun 2010
Location: Sunman, IN
Posts: 2,083
Default Agree

Agree with the RV content...
Aerospace Engineer '88

Structure - 90% Done
Cabin Top - Aaarrghhh...
EFII System 32 - Done
297 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful

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Old 09-20-2019, 01:26 PM
kaweeka kaweeka is offline
Join Date: May 2011
Location: Roseville
Posts: 350

...seems quite relevant to me.
RV-9A N435KR, Vans calendar March 2018
LIO 320 B1A, Dual LS Plasma III, AFP injection
G3x touch
Roseville, Ca
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Old 09-20-2019, 08:20 PM
gasman gasman is offline
Join Date: Mar 2007
Location: Sonoma County
Posts: 3,731

Good to go then................
VAF #897 Warren Moretti
2019 =VAF= Dues PAID
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