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Why put the PSRU on the Rear Face of Block

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pfarber

Well-Known Member
Joined
Feb 21, 2019
Messages
1,064
Location
Dollywood
I'm driving the prop from the PTO end.

Is there a significant reason why most engines put the PSRU on the rear/transmission end? The only thing that I can think of is maybe crank thrust bearings and the harmonic balancer.

The front of V engines seems to be more easily adapted to a PSRU, once you remove the accessory belts and switch to an electric water pump. Rigging up a pulley for the alternator off the rear of the crank is dead simple.
 
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