"stol" wrote:

Seeing how this same engine design and componants are used in the
Nascar truck series week after week with some teams going several race
weekends without freshening up the motor pretty much explains how
bulletproof the package is. Also keep in mind they are putting out
closer to 750 hp @ 8800 rpms or so this year.

A couple thoughts there - turning an American V8 at 8800 rpm on an
airplane wouldn't be something I'd be tempted to do - even once, and
I'm demonstrably more stupid than most people.

And those Craftsman Series trucks aren't running WOT all day long.
"Several race weekends" involves only a few hours (maximum) at full
power, and even then it's not at all unusual to see them leave their
motors on the ground in pieces down the back straight.

Keep in mind too they are
flat tappet motors too. Mine is a full roller set up which adds alot of
available HP due to much less friction in the motor.

There's a difference, but it's not that big. Remember that any
difference would be converted to heat, and if you were losing any
meaningful percentage of the power by heating the cam and lifters, the
top of the motor would melt in VERY short order (since the oil would
stop working).

The other issue you'd have to face is that if your PSRU is optimized
for cruise speed (to give you reasonable cruise at the "low" RPM you
run it at cruise), you're gonna be spinning that prop WAY past its
design limits at 8800 rpm.

Mark Hickey