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Lehman builds the Exhaust manifolds for the I5 with Inconel.
Inconel is far superior to SS steels when used in exhaust manifolds! But it is expensive as HE... Inconel keeps its tensile strenght even at very high temperatures.
I use it some times in my work as an engineer for the oil/gas industry. Price exampel: M12 x 100mm tie bolt with lock nut in Inconel: price each aprox 100£
Unless you drive a F1 car or similar SS steel is god enough. (not 316/316L)
Used to use Inconel for the exhausts on Toyota TS010 V10 Gp C sportscars, hellishly expensive but it's good stuff! I'm intending to use 321 on my system, is it ok to weld to 304 if I need to mix and match some components? Justin perhaps you will know?
__MDC__
Martin Cutting
aka Keeper of "The Teutonic Kitten"
It's not better than sex, but it runs it a close second.
Used to use Inconel for the exhausts on Toyota TS010 V10 Gp C sportscars, hellishly expensive but it's good stuff! I'm intending to use 321 on my system, is it ok to weld to 304 if I need to mix and match some components? Justin perhaps you will know?
__MDC__
No problem to weld 304 to 321. I think the best is to use 347 filler rod.
316 is good enough in some applications, but when exposed to very high temperatures over time it gets more brittle or fragile than 304 and 321.
In my jobb I have designed gasturbine exhaust systems for offshore rigs (30 000+ hp engines ) and we never use 316/L because it will crack more easily after some time in the heat. We always use 321 (or 347 when casting).
I have seen turbo manifolds in 316 without cracks, but I would have used 321 (or 304) if I should have made my manifold in ss steel.
Not to hi-jack the thread, but my 321 SS manifold stil lives without cracks with the whole weight of the K27, wastegate and front half of the exhaust hanging on it. Its NOT supported at all. Done 17.000 km's with it now.
RS2 Black - stock 315 HP
RS2 RS blau - stock 315 HP
Sport Quattro - 1005 HP High Octane website
Anyway, back on topic. The manifold is being tacked up and the basic runner layout has been decided upon. The cylinders will be paired so that they radially fire into the collector counter clockwise. I will have some pictures to post tomorrow night, as tonight I'm going to see Matisyahu in concert.
If anyone would like to have me fabricate a turbo header from 321, I am more then willing to. Check out the cost of them from Burns Stainless:
With the cost of u-bends around $45-50, I'm looking at a very expensive header. I'd love to use the stuff, but no one would buy them at the price I'd need to sell them for to make a profit.
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) and we never use 316/L because it will crack more easily after some time in the heat. We always use 321 (or 347 when casting).
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