BOTH PP and side ports

The current output for 13B with two 38MM chokes is 225 HP at 9,300 RPM.

That

is with as big a street port as you can grind. It wouldn't last long at

that

speed. At 6000 RPM I don't know. The racers need power from 7,000 on up.

HP at 6000 sounds about right. I would leave the inserts in the exhaust
ports. Run 1 7/8" ID headers as long as possible before collecting. The

exact

same length of both pipes is the most important feature. In GT-2 you can

run

a bridge port and two 44MM chokes. Best power at 9,300 is just over

300HP. I

would build it with a mild street port, and if you don't like it you can

add

the bridge port later on. If you are still unhappy you can go to the
periphery port later and just epoxy the side ports shut. You can

assemble

part of the engine and copy the side port timing onto the rotor housing

with

a marking pen and a small square. I used a piece of exhaust pipe formed

into

a square on one end, and epoxied into place. I think this will be "air

show"

power on a Tailwind.

Lynn E. Hanover

Anyone ever thought about using BOTH PP and side ports at once? Is there

anything that would prohibit this?

Brian Trubee

my omc single rotor engines have both side and p ports.   walt.


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