Paul,

      I had sort of an odd thought, and I'm not familiar enough with the
      the 13b to reason it out.  With a p-port engine, would it be
      possible to flip the rotor housings backwards and have the
 engine     run in the opposite direction?

      Josh

      We have discussed this in the past and that is the first
   suggestion   that might work. The tension bolt pattern would not
   match up but if   you are building your own end housings that would
   not matter.

      Paul Lamar

    If you build your own end housings they could be designed so they
   are both including the bell housing pattern. That way they could be
   just turned around. For twins with reverse props, one engine turned
   around and a change to the PSRU if it has an internal oil pump.
 This  way a dual supply of spare engines is eliminated.

    Dale Davies

   Don't forget about all the accessories such as the starter and the
 water  pump.  They would not be happy running backwards.

    Mark LaPierre

  This is simpler than you are looking at. If you are building your
 own Al end housings, make the front one with the bell housing on it.
 If you build the e-shaft, make both ends like the Mazda rear with
 the taper. Then you can put an adapter like the flex plate or
 flywheel on. You put the ring gear and starter in the same place you
 always did. Just turn the whole assembly around. The drive is then
 reversed. The coolant pump would have to be mounted off the side,
  but should be fairly simple while doing CAD for the housings.
 Starter turns normal direction. Alternators may need to be turned
 around and mounted on the other side of the belts with a drive
 bolted to the ring gear hub. Same with the CAS on the e-shaft. With
 p-port you do not have ports in the end housings, so that simplifies
 that part. Makes room to mount the other needed accessories.

  Dale Davies

 It's possible I'm not visualizing what you're talking about, but to
 be clear, the alternator doesn't care which way it's turned..  It'll
 wiggle its output happily either way it goes.  The diodes don't care
 whether + comes first or -.  The fan is usually slightly more
 efficient in one direction than the other, but not enough to
 matter.. Thought they do make reverse rotation cooling fans for some
 applications.

 Regards,

 Matt-



The alternator will charge when running reverse rotation, BUT at a lower
output. They are designed to turn one direction and are more efficient when
run that way. Some of the centrifugal blowers were mounted in front of the
belts with the pulley towards the back. The alternator can be mounted the
same. Think outside the box! If you take a photo of an engine and turn the
long block part of the photo around but leave the alternator facing the same
way, but then move it so the pulley realigns with the belt, you get the idea.
The alternator turns the direction it wants but the crank is rotating the
other way.

Dale Davies


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