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-   Rotary Engine Building, Porting & Swaps (https://www.nopistons.com/rotary-engine-building-porting-swaps-55/)
-   -   74-85 E Shaft (https://www.nopistons.com/rotary-engine-building-porting-swaps-55/74-85-e-shaft-40377/)

RONIN FC 06-12-2004 08:34 AM

I once read somewhere that the old 13b e shafts are stronger than the 86-91 shafts

Any truth to this?

ColinRX7 06-12-2004 09:54 AM

I've heard this quite a few times as well...

j9fd3s 06-12-2004 11:10 AM

i dunno, but it also doesnt have the f*$&%&#ng thermopellet, so right there its better

Jeff20B 06-12-2004 12:51 PM

As far as strength, I don't know, but I'd rather use the old style. https://www.nopistons.com/forums/pub...IR#>/smile.png

rowtareh 06-12-2004 01:34 PM

What is the thermopellet? Would'nt a TII e-shaft or FD e-shaft be stronger since it was "newer" than the 79-85 shafts?

Jeff20B 06-12-2004 01:45 PM

I don't know about the FD shaft, but the FC shaft had that stupid oil pellet garbage in it which means it needed to be machined to hold it. That means less material in the shaft which means less strength.



Then again, I've never heard of the front of a shaft breaking. It's always the rear of the shaft that breaks. Maybe it's because of the larger circumference of the flywheel? Perhaps an auto counterweight would put less stress on the shaft because the imbalance is closer to the centerline of the shaft. Remember that the stock flywheels have the imbalance at the outer edge near the starter ring gear.

rowtareh 06-12-2004 01:49 PM


Originally Posted by Jeff20B' date='Jun 12 2004, 02:45 PM
I don't know about the FD shaft, but the FC shaft had that stupid oil pellet garbage in it which means it needed to be machined to hold it. That means less material in the shaft which means less strength.



Then again, I've never heard of the front of a shaft breaking. It's always the rear of the shaft that breaks. Maybe it's because of the larger circumference of the flywheel? Perhaps an auto counterweight would put less stress on the shaft because the imbalance is closer to the centerline of the shaft. Remember that the stock flywheels have the imbalance at the outer edge near the starter ring gear.

Oh, I see. Any way I can change over the FB shaft in the future? Or would it not really be worth it?

Jeff20B 06-12-2004 02:18 PM

Probably not. If you were needing to buy a new one, then yes.

diabolical1 06-16-2004 05:54 PM

i think i remember reading somewhere (either in a book, magazine or on another forum) that there are no appreciable differences in the eccentric shafts in terms of strength. however, just for the sake of the thermal pellet, and the minor pain of having to seek an alternative plug for it, many people prefer using the older ones.


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