A> ddunbar wrote:

Hello Paul,
For aircraft use I ask this question.
What are the pro's and against of putting the throttle body before the
turbo compressor.
Mazda uses the 3 throat body for control of low down torque and flexibility but
a fixed pitch prop is quite different.
What are your thoughts on this.


--
Best regards,
 ddunbar                          mailto:ddunbar@echidna.id.au

A> Good question Don. Hugh MacInnes's book "Turbochargers" HP Books
A> suggest putting the throttle between the compressor and engine
A> to prevent a vacuum on the inlet side when the throttle is suddenly
A> closed at high RPM. That could suck oil out of the turbo and into the intake
A> system past the seals page 23 and 24. On page 103 there is an aircraft
A> diagram with the carb on the outlet side. That is where I am planning
A> to put my slide throttle. However most of the
A> diagrams in the book have a carb on the inlet side.

A> A three throat body will have more intake manifold pressure loss than a one throat
A> throttle of the same area. Make it big and make it clean and simple simple.

A> Paul Lamar

Paul are you say that most of diagrams in the book show the carb or
throttle body on the intake to the compressor.

--
Best regards,
 ddunbar                            mailto:ddunbar@echidna.id.au

Yes they are on the intake side but it is hard to blow through a automotive
carb because they are not sealed like an aircraft carb. In some old
turbo and supercharger installations they used to put
the carb in a sealed box and pressurize that.

On the other hand the carb in most supercharged radials is on the intake side.


Paul Lamar
 
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