Here's a reply from Jason at Dave Atkin's shop re RX-8 vs RX-7 engine.  I
wonder what the difference is in the apex seals?

Tracy's recent experience with a modified 13B with 2.85 to 1 PSRU lends a
degree of credibility to Jason's views.

Tracy, any comments you'd give a person trying to decide between "cheaper,
more readily available RX-7 13B" and the newer, more expensive RX-8 13B"?

David Carter

----- Original Message -----
From: "info" <info@atkinsrotary.com>
To: "David Carter" <dcarter@datarecall.net>
Sent: Wednesday, April 28, 2004 10:00 AM
Subject: Re: RX-8 Renesis engine for RV-6


> We have no plans as of now to build an RX8 engine. We do not see a benifit
to the engine that would make the project worth while at this time. We do
not have an intake manifold that will work with the new engine and the apex
seals are different that the current ones we produce so they are not
interchangeable. The engine block is the same size so the accesories will
have the same fittment problems. The engine has the same dissplacement (1.3
liters) the reason for the increased power is that Mazda has maximized
efficency of the intake, exhaust, raised the compression and allowed a
higher RPM. All of the same can be done on an older style block.
>
> Thanks,  Jason
> Atkins Rotary
> 253-848-7776
>
>
>
>    -------Original Message-------
>    > From: David Carter <dcarter@datarecall.net>
>    > Subject: RX-8 Renesis engine for RV-6
>    > Sent: 27 Apr 2004 18:24:49
>    >
>    >  Hello, David.
>    >
>    >  Have you started building up any RX-8 Renesis engines for use in RV
>    >  airplanes? Since that engine came out last year here in the States I
think
>    >  I want an RX-8 engine instead of an RX-7.
>    >
>    >  What kind of price? I already have a 2.85 to 1 PSRU and electronic
>    >  ignition/injection module from Tracy Crook. I think I want the lower
HP
>    >  (lower RPM) version of the RX-8 engine.
>    >
>    >  Will the short intake manifold you use on RX-7 13Bs work on the
RX-8? If
>    >  not, what would you recommend?
>    >
>    >  About the only mod I think I want is to apply ceramic coating to the
rotors
>    >  to reduce heat transfer into the oil system. (Would want the good
seals that
>    >  you've always used.)
>    >
>    >  I wonder if the water pump and alternator are as high on the RX-8 as
they
>    >  are on the RX-7, requiring similar mods to keep from having to put
"bumps"
>    >  in the top cowling or if they are lower.
>    >
>    >  I just riveted on the first aft top skin and am going on the the
intrument
>    >  panel, top front skin, and tip-up canopy as my next phase of
construction. I
>    >  have the finish kit.
>    >
>    >  David Carter
>    -------Original Message-------
>
>
>