Chuck Hoelzen wrote:

It sounds like your buddy is running a "Revmaster".  This
is a custom built aro engine based on the VW.  It comes as
a turbo with 80Hp or non turbo at 65Hp. Revmaster is still
in buisness building this configuration.

It does use a carb in front of the turbo.  The engine I
have has over 400 hours with no problems.  The carburated
mix should increase the density of the air reaching the
turbo by cooling it.  The engine is set to 11:1 with a
maximum boost of 50"Hg it makes about 92Hp.

Without a wastegate or blow off valve the carb in front of
the turbo acts to create a partial vacuum at less than full
throttle.  The vacuum reduces the load on the turbo and
allows it to turn faster with lower exaust back pressure.

The only problems I know of with this setup is the large
volume of mixed fuel/air in the intake, making for nice
backfires.  Carb problems have been reported but that is
the carb design and is on the turbo and on normal asperated
configurations. I am working on a computer controlled
innition system with detonation detection to allow the
engine to run on 92 pump gas in place of the 100LL.

One interesting feature of the Revmaster is the dual plugs.
They have added a second plug on the underside of a
standard VW head.  Works well but you have to take the top
of the head appart to pull the second plug.
Chuck

 
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