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
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