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Now this is beginning to make sense to me. The stock 20B e-shaft pulley is 5.5", and the wp pulley is 4". I guess Mazda did this in the Cosmo since it was a luxury car (with an automatic trans) and not subject to as high of rpms as the RX-7's. Another probability is that the Cosmo's electrical demands were greater, and therefore required the alternators to be spun faster. I need to find (or build) a 4" multi-V e-shaft pulley, or change everything to a dual V-type so I can use undersize after-market pulleys.
Mark S.
At 06:32 AM 5/7/2004 +0000, you wrote:
Mike,
The Racing Beat and MazdaTrix dual V-belt undersize pulley is
3-7/8" diameter. The same as the stock 86-91 waterpump pulley.
Kelly Troyer
--
Dyke Delta/13B Rotary Power
> I was browsing Racing Beat and MazdaTrix looking at the undersized
> pulleys. They don't list the actual size of the pulley, Racing Beat says
> underdriven 13-15%. Comparing my 4.5" pulley that would make it about
> 3-7/8" diameter. Does that sound about right? Does anyone have a
> measurement of the diameter of these?
>
> Thanks,
> Mike
>
> Mike McGee, RV-4 N996RV, O320-E2G, Hillsboro, OR
> 13B in gestation mode, RD-1C, EC-2
>
>
>
> >> Homepage: http://www.flyrotary.com/
> >> Archive: http://lancaironline.net/lists/flyrotary/List.html
>> Homepage: http://www.flyrotary.com/
>> Archive: http://lancaironline.net/lists/flyrotary/List.html
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