Exhaust Manifold

[Jmac]

Hey Jimmy,

If you have lowered the temp in the manifold, then isn't there going to be more heat in the turbo? If so then there is going to be a bigger temperature difference between the two and isn't this going to increase the chance of problems with the sealing between them, warping etc. Also isn't putting more heat into the turbo going to be detrimental to it's life expectancy. I honestly haven't got anything against changing the manifold, just keen to learn.

Not quite with you Kenny,if you heat coat the manifold then you keep the heat within the manifold thus increasing scavenging and flow and at the same time keeping engine bay temps down and surface temp down,at the end of the day thats how a turbo works its heat expansion,same as a turbofan engine, thats why you will get great boost going up hill when the engine is under load. a big question asked by many apprentices ive worked with is how come i dont get boost reading revving the engine up , how does the thing work??? Heat expansion.The hot expanding gas is where its at but to a safe level so that where its what is being combusted that makes it important,the tune, fuelling, we all know WOT lean is what we dont want. By the way if you go crazy you can heat coat the turbo inside and out too, and lots more. Sorry if my answer is a bit all over the place but i reckon more pros than cons
Jmac

[pogo_55]

Hi Jimmy,

What I was trying to say is that if the heat is kept inside the manifold won't the turbo be subjected to greater heat than it was before. As now most/any heat loss through the manifold has been removed. An example of this is from a cold start the manifold will not expand as quickly as the turbo potentially causing problems like warping. Probably just got too much time on my hands - back in the "homeland".

Cheers

Kenny