-- 
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
Icover 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.
-- 
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I forgot to mention that Larry Childs is set up to make parts and do
the whole job if you wish Don.

Prices are:

$20 bucks each for the tubes.

Bore your housings cost $100. We can supply new ones at competitive
prices if you need new housings.

We will do it all for $250 each for your housings. Tig weld the tube to the liner,
grind and finish polish. This is not that hard to do yourself.
Just be careful not to scratch the chrome. Just about any competent
tig welder can weld in the tubes. We have had three different welders do
it so far and none of them had any trouble. You save a lot of time by having
the pre contoured SS tubes.

See Paul's video at http://www.youtube.com/watch?v=LkKw72dZ2yc

The housings must pass inspection for chrome, corrosion & size before I will accept
them for mod. Payment can be arranged to go direct here using Paypal, then I just
email you an invoice. Work it just like ebay. When the money is
transferred, we ship. I will have Tammy work on setting up to take Visa and
Mastercard as well. I can take credit cards now, but the statement will come
up as HMS electronics.

I will order a 20ft length of tubing and get it cut up for the 8.64 strait
cut profile. I will leave 1 inch sticking out of the housing.

We have Don in Texas waiting for the prices and he is sending housings.
Anyone needing new housings, use the Mazdatrix housing prices. Save some
money on shipping. Simple hose clamps will attach the slide throttle
so the engine can be disassembled very fast.

Even with new housings, these will be a lot cheaper than going to racing
beat housings.

A dual carb and slide throttle combination is on the way for a good idle
and lots of power.  Somewhere between 240 HP and 260 HP. Anyone can understand it
and fix it. The closer the slide throttle is to the rotor housing the better
the P-port idle. This cuts down the amount of exhaust gases getting into the intake
at low RPM.

On the RX8 engine, a new idea is to run the side and p port exhaust using the older p-port
exhaust rotor housings with the O-ring slot in the rotor housing just like the RX8 rotor housings.
Be a great way to reduce exhaust back pressure without any port work. It's fun food for
future stuff to try. Besides, everyone would scratch their head looking at a
5 port header! Just an idea only at this point.
Larry




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