05-10-2018, 08:46 PM
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#8
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VIP Member
Join Date: Dec 2001
Location: phoenix
Posts: 1,486
Likes: 66
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Re: 3" aluminum driveshaft
Quote:
Originally Posted by Jim Caughlin
I have a 3" alum driveshaft that was built by Inland Empire, I cross the finishline at 9400 RPM and have relatively low HP. Interestingly, I was able to test duplicate steel (13#) and the alum one (10#) on back to back runs, zero performance difference. Actually, I can't say that I saw any noticeable performance improvement from any of the lightweight parts that I incorporated over the years (alum spool, lightened ring gear, gundrilled axles, etc), go figure...
One other note on going to a 3" alum driveshaft, don't forget about resonance / critical speed, it isn't purely a matter of strength. I believe there is a chart on the Mark Williams site that lists length vs RPM for different driveshafts.
Jim Caughlin
SS 6019
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^^^ This. I found nothing in a BBC running high 9s bottom 10s and changed all the same things
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