Paul wrote:
Hi, Paul....sorry for the delay in getting back to you....a lot of
"stuff" has happened. Please hold off for just a little bit on designing
a new manifold for me....I appreciate the efforts, but
don't want you to waste any of your time. After talking to Leon in
Australia, I picked up a NA 6 port 13b engine. He said I can get more
"ponies" with the higher compression rotors, and porting. I
just finished pressure washing the new engine. It was running when taken
out of the car last month. Now I have to decide wether to go with mild
street porting as Leon suggested, or go with PPorts.
Of course this decision would greatly effect manifold choice and design.
Thanks for your efforts of late....just don't want you to spend too much
time designing a manifold that may not apply.
I talked to the manufacturer of my 64 x 78 prop, and he said it was
designed for a builder who had an E-Racer with a planned turbo 13b over
200 horsepower. Wishing everyone a Happy New Year
!!! Paul Conner
Leon and I had a long discussion on here a few years ago. He convinced me
he had all
these rotary resources in Sydney do do all these fantastic things and a
great shop to do them in.
I flew to Sydney specifically to check it out. I met Leon near the airport
and spent the day driving
all over Sydney. None of it was true. Just a bunch regular rotary
community suppliers some of
whom had not seen Leon in years. No shop... no nothing! As I understand it
he is in and
out of the hospital on a regular basis. If I never hear the man's name
again I will be very
happy.
Your manifold design is almost done anyway. I need the dimension from top
of firewall to top of spar and the depth of the spar.
The six port needs extensive modifications but once done it seems to be
the
hot tip in road racing these days. From reading the above I assume you
have the
four port engine with low compression rotors. Where did you get that?
could be part of your HP problem.
Your prop can be shaved a bit to fit 190 to 210 HP which with a good six
port manifold
and ram cold air is right in the ball park.
Paul Lamar
Hi, Paul....yes, the engine that is currently on my SQ2000 is a 1989 turbo
model (without a turbo). I am of the impression that my new NA 6 port would
give me more power once it is ported. (Hope I am correct on this). The
prop manufacturer said he could cut the prop to a smaller diameter, but
since there is so much pitch, there is only so much he can trim without
getting too thin on the blades. Perhaps with a ported 6-port and a slightly
smaller diameter prop, I might be more in the ballpark of a balanced
prop/engine combination. I will try to get out to the airport tomorrow to
get the rest of the measurements. Take care. Paul Conner
I would send the engine to Mazdatrix and let them port it as it will need
to be completely disassembled. John at Mazdatrix is very good. He built
Perry's engine a few years ago and Perry is still flying it.
I can get the intake port pattern from John and design a transition
from that shape to a round tube. Ed Klepies can then build a manifold
for you and send it to Mazdatrix. We can install it on the engine at
Mazdatrix
and test and tune it on their dyno. You will need to make a decision on
the exhaust system as I think a ported six port would choke on the stock
Mazda
cast iron manifold. This will provide the newsletter with a lot of hard
factual
information on this subject.
In the mean time you can keep flying your airplane with the engine you have.
Paul Lamar
Here is a better illustration of the Rhino "unwrap developed surfaces"
command.
This 2 inch long transition is from a typical ported six port engine port to
two
inch round tubing. If you have room for it you could make it smoother by
making it longer such as 3 or 4 inches long.
This is a very powerful technique for laying out accurately made welded
sheet metal rotary engine intake manifolds.
BTW get a price from Mazdatrix for the porting labor as it may be as cheap
to go to one of Jerry's p-port rotor housings with a guaranteed
230 HP potential at 6000 RPM. Demand a 1.875 hole :) Don't let him
talk you into a puny 1.5 inch hole :)
You would save money on the manifold fabrication labor.
Fewer expensive tube bends to buy as well.
Paul Lamar
Paul, burns stainless sells transitions like that.
Bulent
Yes they do. Take the 2 1/2 to 2 inch and squash the 2 1/2" flat and
you might be able to match the oval but I doubt it :)
These are a very limited ranges of sizes.
Paul Lamar
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