Quote:
Originally Posted by serialk11r
http://www.asminternational.org/cont...81G_Sample.pdf
Interesting read on fatigue. 300M steel seems to have a fatigue limit >4 times higher than aluminum (with 10^8 cycles or so), so in theory 300M rods built to the same strength would be lighter. Damn.
I think for lower rpm street cars the stresses would be low enough and the compressive forces would be comparatively greater so aluminum rods could outlast most of the other engine parts. I think aluminum is probably cheaper than say 300M steel so we might see it in street cars someday.
BTW WoW, the red lettering is quite menacing 
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lol dont get too intimidated
but ya, big thing about 300M is the amount of increased carbon / silicon over 4340 steel. making it a big costly cluster fuck. Especially compared to aluminum!
In the case of the AS1 as an application, i think Carbon aluminum forged rods would be PERFECT for cost and strength, and performance. because its got a wide rev range, low output non-FI. Making it just as durable as similar 4340 steel in performance engines.