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Vapor lock issue solved [RB cars only]

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kellysguy said:
I'd use a spacer to help keep it cool ( mine is being cut right now). I also plan to use motrcycle header wrap. It's the same stuff as regular auto header wrap just 1" wide instead of two.

Two reasons for 1":

a. stock exhast mainfold isn't that big.

b. $29.99 instead of $44.95 (both 50' rolls.)

I also have my bolws wrapped with foam pipe insulation. They made a rubber one too which I'll probably switch to, although I might not need it anymore.


IMO, if you are having that much trouble w/ PCV issues, your rings are shot. My car did that till I reringed it. Now I get almost nothing out the tube and it just dangles out there.
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My experience with wrapping pipes on bikes with that stuff is not good. The heat doesn't get out and it keeps more in the head and the pipes literally start to glow red under that wrap and eventually melt or crack or bend to where they don't seal good at the head and you get a leak there.
I don't know what this would do to a stock cast iron exhaust manifold on a spridget. It might be ok, or it might crack or something. I just know it will get a lot hotter under that wrap.
 
I think it'll be fine. Bike headers are smaller and thinner than automotive applications not to mention, I've know of some turbo guys that had glowing exhaust manifolds that didn't crack. Folks tend to push bikes harder than Midget 1500's and for a longer period. Were you experiencing this with air or water cooled bikes?

I rarely push my car hard and if so, for just a few seconds. I also believe that the fact the 1500 isn't a true solidly mounted manifold (mostly clamps) and not bolted down tight with nuts at all attatchment points should give it enough room to grow when hot. My manifold has shrunk some anyway and could stand to grow a bit. I'd really like to fab one out of stainless, but I'm a bit away from that right now.

I might go to a gasket that has metal on both sides to facilitate manifold movement better. The one that was on the car when I bought it was like that.

I've considered wrapping the intake, but that may look too ugly. Too bad jet hot costs so much. I might have a cure for that too. :hammer: :wink:
 
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