Ed Klepeis wrote:

Dear Paul
    A major after market alum pulley mfg. says in there catalog claim

that you will get 2.7 hp gain for every pound you lose from the crank
pulley what is your take on this claim. I know on the

subaru eng we can lose approx 5lbs on the crank pulley by going to an

alum pulley. I have a pulley already for the 2.5L subaru but I'm
thinking about having an alum undersize  4 or 5 grove pulley

made up for the rotary if there is enough call for it.

              Regards

             Ed Klepeis

 techwelding@comcast.net

Perhaps if you take into consideration the rotational inertia
and you measure the HP in terms of engine acceleration. In an aircraft
engine that runs at constant RPM it is not applicable.

Paul Lamar

However weight is weight.  To loose 2 or three pounds here or there can
make a big difference in the overall scheme of things.  "save the ounces
the pounds will take care of them selves"  Ed I am interested in a
pulley  T.W.

 
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