I think this subject has been discussed before, but I need advice about
whether to turbo or supercharge the 20B on my Velocity XL pusher. I
have the stock turbo but it seems that a supercharger would be an
easier install. On the other hand, a turbo is ultimately more efficient
in not stealing so much horsepower, and is a little more compact
installation. Bruce T. felt that a supercharger sized for a 4.0 liter
piston engine would do the trick and was preferable to a turbo. I
have read McInnes' book and attended a Turbo Tom forum (he recommended a
supercharger because of the rotary exhaust temp). I am only looking for
a light boost, say 4-6 over to give me around 325 HP. I plan on using
Tracy's redrive. Anybody have any thoughts on this?
On another subject, I got an N number so that I could insure my project
while it was under construction and within a month I received a friendly
letter from the state division of taxation looking for their piece of
the action! It turns out that I could have just reserved the N number
and the carrier would still have insured it. A word to the wise....
jeremy solomon
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The stock 20B dual turbo is definitely unsuitable if for no other reason
it is very very heavy.
With a supercharger 100% of the required HP to drive the
super charger comes from the engine's e-shaft. In effect a 300 HP
net engine is generating 330 gross HP or so. That means there will
be about a 10% increase in fuel burn.
A turbo charger on the other hand gets as much as 90% of its required
HP out of the normally waste energy in the exhaust. The waste energy
amounts to about 50% of each gallon of gas burned in almost any internal
combustion engine so to use this waste energy to drive the turbo charger
is a very good idea. You should have only a slight fuel penalty
with a turbo charger and you will be going much faster at altitude.
The exhaust heat will not be a problem is the turbo charger is sized right
and is equipped with a Inconel turbine. Most are.
Paul Lamar ...No rotor no motor.
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