How many people are building side port 13B? 4 port? six port? Side
port RX8 motors? 4 port? 6 port?

Paul Lamar

-- Hi Paul, I am putting an RX8 in my modified Long EZ. Chris in NZ

P-port or side port RX8? four port or six port ?

Paul Lamar




Hi Paul,
I'm putting an RX8 6 port in my RV-7A but haven't decided whether to P port or not. Don't know what to do with the extra ports if I P port?

Dale Harvey
Beaumont, TX


You just plug them up with silicone rubber.
Is you engine all apart? If not you might not want to bother with
p-ports.  If your engine is running and is in good shape you will
fly sooner by not taking the engine apart. On the other hand making
an effective side port manifold is a real challenge. If not done
right you will be lucky to see 150 HP. If it is really bad you
can wind up with 100 HP :)

A manifold is an aerodynamic device and streamlining is almost everything.
A crude joint between the intake tubes and the port openings can
ruin a manifold.

The other major factor is the length of the runners. Is is essential that
they be tuned like organ pipes.

Paul Lamar

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