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  #21  
Old 05-01-2012, 08:37 AM
aerhed aerhed is offline
 
Join Date: Dec 2008
Location: Big Sandy, WY
Posts: 2,567
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Stras, which airport are you and Scott based at? If I flew over that way to demo for sale, where is easiest in/out? Morgan? OGD?
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  #22  
Old 05-01-2012, 08:48 AM
Bavafa Bavafa is offline
 
Join Date: Oct 2007
Location: Sacramento, CA
Posts: 3,351
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I have mine coated and have had zero issues but it is only about 380+ hours so far, so I am keeping my finger cross.

As for temp goes, my engine runs rather cool, specially the oil temp. As a result, I have installed an oil shutter (I live in CA) and even in 70+ degree weather, I have it partially (50%) closed to get the 185 temp. But I expect in the heat of the summer I will have it fully open.
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  #23  
Old 05-03-2012, 04:25 PM
f-1rocket f-1rocket is offline
 
Join Date: Dec 2010
Location: Bigfork, MT
Posts: 46
Default Exhaust coating

I built the first F-1 Rocket to fly back in 2000. My oil temps ran a bit over 200 degrees at cruise on a hot day, so over a period of time I tried everything suggested to get the temps down a bit. One suggestion was the exhaust system ceramic coating, which I did at a cost of several hundred dollars.

That along with almost all other suggestions (such as louvers on the bottom of the cowling) did nothing. I saw no difference when the exhaust were coated both externally and internally, which in my opinion is a complete waste of money. Finally, an additional oil cooler was installed which solved the problem.

Tell you what guys. I have been flying Vans aircraft for 25 years and have owned between 15 and 20 of all types. There is only one thing I am certain of. If you go outside simple, which has always been Van's principle, you are probably making a mistake. Jim Cash
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  #24  
Old 05-04-2012, 08:05 AM
Flybuddy2's Avatar
Flybuddy2 Flybuddy2 is offline
 
Join Date: Oct 2009
Location: Fort Myers
Posts: 370
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I had a Velocity prior to the RV and coated the simple 2 into 1 exhausts both inside and outside.
ran cooler CHTs as the small armpit scoops were drawing air from the bottom up over the exhaust. Had heat bubble on the glass cowl prior to doing it and it eliminated them. EGTs go up about 75 degrees.
On an RV plusses would be:
reduced under cowl temps
longer life on accessories from less heat exposure
cooler fuel/air on intakes (slight power gain)
longer life on fiberglass cowlings
less heat leakage from sides of cowling into naca cabin inlets
downsides:
cost
shorter exhaust lifespan
increased difficulty on reinstallation due to size increase of coating
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  #25  
Old 05-04-2012, 08:19 AM
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rocketbob rocketbob is offline
 
Join Date: Jun 2006
Location: 8I3
Posts: 3,564
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For ceramic exhausts to work well they have to be coated from the inside. And for the ceramic coating to adhere a special wand has to be pushed down the pipes to bead blast the ID of the pipes, and a special spray gun used to spray the coating inside the pipes. Most shops are not set up for doing this so if you decide to have your pipes coated, ask what their process is for the insides of the pipes.
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N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
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