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Message
Rusty,
I've made an appointment to see my contacts
machinist mate, who also does the dynoing, so we can have time to discuss
al these issues.
The 38mm is for dirt racing not track, he suggested
this was the best all round size, but has a hesitation at around 4,000 to
4,500,
which he is yet to identify the cause.
He has done the full range of P-ports for all
classes of racing i.e. 38 to 50+mm.
Actually the chap I initially talked to works for a
Mazda dealership and his racing has been sponsored by the dealership
(I suspect) - this is his machinist.
MY PSRU is not dissimilar to Tracy's in regard to
using the 2.85 Ford E4OD Planetary. Just differently configured, but then again
I'm led to believe that Tracy has changed the design for the 2.85. I personally
prefer different bearings. I don't plan on going
over 7,500.
Someone mentioned to me Tracy didn't exceed 7,200
on take-off, with the 2.85.
I hoping for 115 to 125hp at 7,500 rpm, I think
that's achievable!
George ( down under)
I just had a meeting with a chap in the racing
game who specialises in P-port - do you know what size he recommends for all
round performance, you guessed it 38mm ( 1.5"). Now Jerry will be glad to hear
this!
Hi
George,
Is this guy
limited to 38mm for some racing rules, or does he just think that's
best? Since he's building race engines, with the size ports that are
being theorized as optimum, can you post some dyno runs of one of his
engines? I still think it would be interesting to see how the PP
compares to a conventional street port REW in the 7000-7500 range that we're
interested in. I'm sure we could get dyno reports from Lynn or Leon from
various bridge ports, and street ports for
comparison.
How
much HP do you expect to get from your PP Renesis, and at what RPM?
Since you're making your own gear drive, are you planning to try to get a
higher ratio, to take advantage of the PP?
Cheers,
Rusty (got
several housings, but not convinced I should punch extra holes in
them)
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