Hello Paul,
Dave Mc was telling me what you achieved with your Renisis perifial
intake port. I did miss al that info could you sent to me.
Has there been any dyno test on the Renisis with out the complex
manifold. I was interested to see what it would produce at high rpm
with good breathing and larger carb bores. When I look at the
manifold and its complexities it is made for engine flexibility and fuel
emission regs. One can only believe that the engine will produce more
hp at the higher rpm with good breathing. I am preparing an engine now
with two 42 mm Nikumi carbs to be put on the dyno to get a result. It
will save me money if this has been done before.
--
Best regards Don,
ddunbar
mailto:ddunbar@echidna.id.au
Check out the youtube video.
http://www.youtube.com/watch?v=LkKw72dZ2yc
One of our most popular videos on youtube.
Highest ratio of hits per day. Dave Lemon says the dyno lied so
it may not be 264 HP at 7500 RPM for the RX8 engine.
However we got 245 HP from the 13B versions so the real number
for an RX8 is somewhere betwixt. Higher compression ratio (10:1) and 20%
more exhaust port area for the RX8 engine.
The 24 inch 1.875 ID runners gave the best results at 7500 RPM.
Here too is the 215 HP Power Sport P-port EFI engine dyno run
with somewhat smaller runners perhaps a bit longer. Perhaps Steve
Beckham has some more data on this engine.
We used a Weber 58 mm in both cases.
The new carb is dual 48 mm. The Weber of course has butterflies and aux
venturis so we hope the new slide throttle carb will generate near same HP.
We are going to run a new custom designed dual slide throttle carb on the RX8 p-port
engine shortly. So we should have some better dyno data soon. The new carb allows
leaning while the engine is running so we can optimize the mixture for the
RPM and load. Something we could not do with the Weber. We would have had to spend
a lot of time mucking with the jets while the dyno was off.
Be prepared for a lot of fuel vapor stand off when the engine is "on pipe".
Typical of all organ pipe tunned engines. You can see that on the youtube video.
That means the organ pipe tunning is working well.
Build an air box to contain it as it is a fire hazard if not an
out and out explosion hazard. I built my new one with a transparent Lexan
cover so I could see what was going on in there.
The flanges are bent outward to prevent the possibility of any
box fasteners getting in the engine which are guaranteed to ruin your
whole day. Of course it could be tig welded too.
--
Paul Lamar ...No rotor no motor.
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