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
 
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