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-   -   Driveshaft (https://classracer.com/classforum/showthread.php?t=12813)

RJ 09-08-2008 05:21 PM
Driveshaft
 
I am needing about a 3.5" diameter 57.5" long driveshaft that needs to go about 6500 rpm. The driveshaft people I've talked to say that a shaft that long' going that fast will be over the critical speed. I see lots of station wagons racing out there that don't seem to have any problems, what is everybody using at about this length?

Thanks

69Cobra 09-08-2008 11:35 PM
Re: Driveshaft
 
http://www.dynotechengineering.com/

Pat Cook 09-09-2008 12:05 AM
Re: Driveshaft
 
RJ, I had the same problem with my "slug" until I put a Dynotech drive shaft in it, cured the problem.
When I had the rubber filled drive shaft it did not shake, after the "Canadian Transmission" was installed, it took 3 drive shafts until I talked to the guys at Dynotech and bought one of there shafts.

Run to Rund 09-09-2008 12:29 PM
Re: Driveshaft
 
4" diameter would be recommended for that length and speed. You can find a critical speed chart at www.markwilliams.com


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