Barry,

  Before we go too much further, we need a PSRU that can handle 500+hp.
    We've already had flywheels [flex plate] disintegrate and my
  input shaft broke the
  lock pin.  I would consider installing a turbo, but in my opinion, the
  psru is the weakest link.

  Mark
  P-port 20b

  My last trip to Tracy's we discussed this. His recommendation  is to use
  an aftermarket aluminum flywheel and attach the PSRU input to that. His
  latest iteration of the PSRU will attach to this flywheel easily he says.

  As far as the lock pin, that would take more thought. Drilling it out
  and installing a larger diameter pin will increase the shear of the pin
  itself but at a cost to the strength of the shaft itself.

  Kevin Alderman

  Just install two lock pins 90 degrees to each other.

  We did that on Dave's turbo Reno racer.

  When I get home I will send a dwg. We have been around and around on
  this. I am surprised Tracy did not mention it or start doing it.

  Paul Lamar


    Other than the weight, I take it there was no problem with the flywheel
  Dave installed?
    Re: the pins: is it possible that the pins were transfering the power
 and
  the pin bores were tight and the spline clearance was allowing the power
 to
  try to flex the pins?

   Dale Davies

  Dave has reported no problem so far with the steel flywheel.

  BTW If you can't handle putting two pins in the sun gear send it to me and
  I
  will do
  it. I have done a couple already,

  Paul Lamar

  Is Dave Leondard racing at Reno again this year?
  Chris Cosman

  I don't think so.

  Paul Lamar


  To All,
  While we are addressing PRSU issue's, here is another one. I'm
  mounting my prop extension and prop; In doing so I have found
  that my prop tips move about 1". Is this too much back-lash? Seems
  like I remember hearing that it should be around 1/4". Any suggestions
  would be appreciated . Thanks!
  Frank Clementi

  Mine moves about an inch as well. Next time I go to the hangar I will
  measure it.

  Paul Lamar

 Paul,

 Tracy recently told me the backlash should be between 3/8 and 5/8".

 Mark

 I'll go out today and see what mine is.
 Frank, What gear box do you have? 2.17 or 2.85?

 Paul Lamar



Paul,

I have the RD-2C which is 2.85 ratio.

Mark

My back lash is one inch + or - 1/16th. I used two yard sticks clamped together.
Mine is the old 4 pinion 2.17 and the 4 pinion is likely to have a bit more back lash
than the six. There are two splines in there as well which add to the potential back
lash. Same for the six.

Paul Lamar


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