4 stroke muffler heat and cowls
05-03-2002, 01:58 AM
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4 stroke muffler heat and cowls
have routed a 91 4 stroke muffler down inside a plastic cowl to exit the bottom of the back edge of the cowl. The cowl covers nicely but the elbow of the header comes within 1/16 th of the inside of the cowl. Is it going to melt and deform? would a foil tape on the inside of the cowl help this issue? Some would say get a glass cowl but I don't want to do that yet. I worked hard to get a good fit and want to see If I can make it work.
05-03-2002, 05:40 AM
#2
4 stroke muffler heat and cowls
Some of the manifolds on the 4strokers get up to 600degrees. Very hot! I'd like to say it won't melt. Without looking at cowling though, I won't say that. If cowling was fiberglass, you know there wouldn't be a question. Is there any way you can get more clearance? Oh Oh Oh....I know............how about laying in some carbon fiber in that area. It's better then glass, and lighter. It goes on the same way too.
I thought about something like foil/aluminum, that could be just as bad though, as it would conduct heat. Carbonfiber on the other hand would be bullet proof as far as heat goes, and would add a bit of strength in that area.
There ya go...good luck
I thought about something like foil/aluminum, that could be just as bad though, as it would conduct heat. Carbonfiber on the other hand would be bullet proof as far as heat goes, and would add a bit of strength in that area.
There ya go...good luck
05-03-2002, 09:58 AM
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heat
you can see the cowl setup on my site in the skybolt pictures, under engine sub section. Where can you get carbon fiber cloth?
http://memebers.rogers.com/ctatham
http://memebers.rogers.com/ctatham
05-03-2002, 09:20 PM
#4
4 stroke muffler heat and cowls
www.Arts-hobby.com
These folks are very cool, and have a selection of c/f, as well as other composites. Shop the whole site, I would recomend the woven type material though, opposed to what they refer to as "tape". I bought a 6"x3yrds(9'), and I've cut what I needed off of that, and saved the rest for future projects. I can see using this extensively in stress areas in place of glass. It's much more cost effective to buy in bulk and cut what you need for application. Although, for your small application, you might just want to get small amout to try it.
I used it for reinforcement in center section of wing on my 27% EXTRA. That area will be the last that would ever fail. It seems almost bullet proof, and it's so much lighter then it would've been had the same area been done in glass.
These folks are very cool, and have a selection of c/f, as well as other composites. Shop the whole site, I would recomend the woven type material though, opposed to what they refer to as "tape". I bought a 6"x3yrds(9'), and I've cut what I needed off of that, and saved the rest for future projects. I can see using this extensively in stress areas in place of glass. It's much more cost effective to buy in bulk and cut what you need for application. Although, for your small application, you might just want to get small amout to try it.
I used it for reinforcement in center section of wing on my 27% EXTRA. That area will be the last that would ever fail. It seems almost bullet proof, and it's so much lighter then it would've been had the same area been done in glass.
05-04-2002, 01:59 AM
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Re: heat
Originally posted by ctatham
you can see the cowl setup on my site in the skybolt pictures, under engine sub section. Where can you get carbon fiber cloth?
http://memebers.rogers.com/ctatham
you can see the cowl setup on my site in the skybolt pictures, under engine sub section. Where can you get carbon fiber cloth?
http://memebers.rogers.com/ctatham
06-17-2003, 01:39 PM
#7
4 stroke muffler heat and cowls
What I do is to put two layers of foil tape (About 2" x 2"). let the first layer wrinkle a bit so that the second leaves a few small air spaces. Ca them if necessary. While aluminum is a good conductor of heat, it will transfer the heat AWAY from the imediate area. I have even used this method in an area where the exhaust was blowing directly at the inside of the cowl without any distortion.
