Paul,

I was looking at the web site at Mark's P Port installation specifically
the plenum.  What is the function of the plenum?  Does it trade high
speed air for pressure? The web site says it is to contain the vapor
cloud that was apparent on the U tube dyno run.  The web page states
that it is not needed if injection is used.  I just wanted to get a
clarification on it.  How big should it be?  Is it volume or a specific
size?  I have space constraints and may use part of the lower cowl
as a surface for the plenum. I would like to place injectors in the
tubes rather than in the plenum.  If the hot wire MAF is mounted on
ther entrance to the plenum does this pose a potential hazard?
What are the dimensions for the tooth wheel for the 555 EFI design.
Thanks for any help.

Joe Berki
13b P Port


It keeps the vapor cloud from floating away :)
The web site is wrong. What web site? Who's web site?
As large as possible.
The hot wire mass airflow sensor does not present a problem at
the entrance to the plenum. It is really just a warm wire.

The shape of the toothed wheel depends on the ignition type.
Probably 2 teeth 180 degrees out.
It can be 2 inches or 8 inches in diameter. It matter not
as long as tooth is pointed.

Paul Lamar