The P-Ported Renesis engine does seem to offer the best of both worlds:
1) Easy intake breathing
2) Unburned exhaust recycling
This results in cooler exhaust, quieter exhaust, better BSFC, easier
induction plumbing, and so on.
BUT ...
Are the Renesis apex seals durable when passing over a gaping intake
peripheral port?
It would seem to me that Mazda would have designed the seals to be
OPTIMAL for full surface contact, full time. The Renesis has no
significant holes in the peripheral housing.
I have been lurking on the p-port Renesis subjects, waiting for someone
to address the issue. Either I missed it, it's a non-issue, or we all
forgot to consider the implications.
Is there ANY experience with p-ported engines with Renesis apex seals?
Would/should we consider other seals, like RWS's or Ianetti's?
--
Vince Orton
What a coincidence. I was sitting in Dave Lemons office (owner of Mazdatrix)
yesterday and he brought up the exact same subject.
I pointed out that Mazda used very short 3 piece apex seals from around
1989 through 2003 and they had no trouble passing over the peripheral
exhaust ports. The exhaust temp in that area is about 1800 F and
it is squirting through a slot, one side of which, is formed
by the low 3 piece apex seal. RX8 seals are back to two piece.
APEX SEALS TO USE.
I would only use stock Mazda cast iron apex seals as they are optimized
for use with the rotor housing's chrome and hardened steel liner.
Any steel seals, and I have seen some real junk lately, are going
to be real hard on your expensive rotor housings. We recently
took an engine apart that had steel after market apex seals. After only
3 dyno hours and it looked like it had 300,000 miles on the rotor housings.
For more info see:
http://www.rotaryeng.net/seals.html
Paul Lamar ...No rotor no motor.
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