Hi Paul, I'm Rick in Denver and it's time to get in this century. I've
located several 13b's around town and wondered if they are still
acceptable for conversion as of today. I have the conv. manual coming
with the tape but haven't been up to speed with the rx8 13b. Your
information is awesome and thanks in advance for any help. The eng will
be going in my Wittman Tailwind. Best, Rick
----------------------------------------
Anything from 1989 up is good. Even better is 1992 to 2003.
Most of those engines come from Japan.
The six port RX8 engine is OK but the jury is still out on
P-porting an RX8 engine. You probably would need earlier rotor
housing with the P-port exhaust as well but that is not cast
in concrete yet.
The intake manifold is actually easier to make for a P-port engine
as it consist of two 180 degree 2" tube bends and a slide throttle.
No complicated transitions from oval ports to round tubing.
Paul Lamar ...No rotor no motor.
Paul
As you know I want to P port my 1990 13B. and try to get close to 300 out of
it. Are there significant advantages to the 1992 and up models? I would
like high comp. Renesis rotors for my choice of fuel but you mentioned
something about the apex seals concern over the P ports.
Doug in Japan
The end housings are stronger. I think somebody has already
cracked a pre 1991 due to detonation.
Paul Lamar ...No rotor no motor.trix
Paul,
Both end housings huh? I have to speak with my local mechanic friend. I
spoke with Jeff today at Mazdatrix about purchasing some Renesis rotors. He
said for a P. port application I would have to have the rotor apex seal
grooves deepened to accept different seals. To date they have not found a
machine shop willing to do that. Huh?? Hasn't this been a standard
procedure for a lot of racers in the past? IE putting in 3mm seals or
ceramics etc.
BTW he told me a fellow bearing your resemblance had stopped by earlier:)
Doug in Japan
Just the rear end housing seems to have that problem.
Yes coincidently I was at Mazdatrix today talking about that very
subject. All Mazda apex seals are now two piece RX8 technology except
the ones they sell for the second and 3rd gen with the P-exhaust
port are deeper. They did say that Guru could do it for $80 Aus
per rotor. RX8 rotors are cheaper and more accurately cast with
a slightly higher compression ratio. They will work in 2nd
and 3rd gen engines if the apex seal slot is made deeper.
Same goes for a p-ported RX8 motor.
Paul Lamar ...No rotor no motor.
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