Probably belt driven pcv vacuum pump.

 

It can be a mechanical fuel pump

 

It is

 

There are an awful lot of 1g dsm's running deep into the 9's with cast manifolds.

just my .02$

 

Lol, sorry Ted but you need to take a course on thermo dynamics. Check the thermal conductivity of air, cast iron, 304 and inconel 625. The thinner the walls, the less energy it needs to become saturated.

Also a true motorsport turbo exhuast manifold will have atleast another full length pipe around each of the primary tubes forming an insulation 'air gap' such that it retains the radiated heat.

 

What about 13-8 stainless for manifolds? that is extremely durable and its a lot less than inconel.

Great read though. Oh one question though on a manifold that is all over the place aka full-race. How do you put a heat shield on that??

 

Actually, "thermodynamics" is one word, and nowhere did I indicate that thinner walls (less mass) requires more energy to saturate. But that is less about thermodynamics and more about calorimetry, don't ya think?


The stainless commonly used for race-grade applications is 321, which has greater heat stability as a result of its titanium content. It's more expensive than common 304, but it's more durable and lasts longer.

 

Are high carbon steels like 1026 or 1018 manifolds good for manifolds? They are fairly cheap and it seems fairly durable. How is it for heat saturation?

But sticking to the actual topic of this thread. would the type of manifold depend on the turbo being open or twin scroll?

 

Carbon steel does not have nearly the oxidation resistance, strength at temp, or creep rupture strength to be suitable for a turbo manifold. Stay far away.