Joseph Berki wrote:

Paul,
        Put me down for an intake.  Check is in the mail.  If you or

anyone has

what I need to do to make it work on a 6 port, I will be doing a non turbo
with 89 rotors.  Thanks for any help.

Joe Berki
Limo EZ

You will need to do some porting with a die grinder on the manifold
to allow air into the upper side ports. Also you will need to at
least radius parts of the cast iron opening with the die grinder
to smooth the flow into the two separate round holes in each end
housing.


If you don't need the the low profile and the turbo clearance for
a six port engine I recommend getting a stock six port lower manifold

>from some place and cutting the  stuff off you don't need. Then fab

an upper manifold using a flange and pipe or tubing runners. This
example was done by Mike Wills.

Mike also used a modified top part of a six port manifold
but you would get a lower profile I suspect by fabricating a
mating flange and using two inch inside radii RB Wagner pipe bends.
RV4's have relatively a lot of room, above the engine, as the thrust
line is rather low relative to the top of the cowl.

Mike is also using a dynamic chamber design. That was developed
by Mazda  to increase the torque at 3000 RPM or so IMHO.
High torque at 3000 RPM in a geared aircraft engine is useless.
You will get more power at the top end where you need it by not
using a dynamic chamber as confirmed by Chuck Dunlap who tried
it with and with out the dynamic chamber. Just use a simple
plenum and bell mouths on the ends of the runners where they enter the
plenum. According to Power Sport bell mouths alone are worth
5% or 7 to  10 more HP.

Although you can do it I don't recommend using the stock injector
locations. It is much safer to move them over to the cool side of the
engine away from the exhaust. In theory you will get slightly
lower fuel burn as well. We have had our share of in-flight fires
and leaking exhaust that caused emergency landings and possibly
one fatal crash.

I'll return your check if you decide to go this route.

Paul Lamar

Joseph Berki wrote:

Paul,
         I believe I will need all of the help I can get to keep the
engine  as small as possible.  The Long EZ has only 18" of firewall and the
Limo has 22".  I agree about the torque thing.  I was wondering about
putting the injectors on the cold side vs. close to the ports.  Does the
fuel tend to separate if the injectors are far from the ports?  What about
using different end housings?  Can a 4 port be make out of a six port?  I
saw the pic that you sent previously grinding the housing so the two ports
in the end housing are one.  Did you get the snail  mail?

Joe Berki
Limo EZ

Unlike a carb system each port has its own runner and injector. So fuel
separation is not really an issue. It all finds its way down
the runner sooner or later.

Yes. A really big four port can be made out of a six port. I think that was
Mike McGee. Here is a pic. Mike also ordered the manifold and I can
hardly wait to find out how it works :) It should be real strong and
cheap. The history of the Mazda rotary is;... the ports are getting
larger and larger and the HP greater and greater as each new generation 
is announced.

Paul Lamar

 
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