Paul
Typically,
how much boost does a turbo diesel run----say in a marine application pushing
90 ton boat or a semi truck ccarrying a load ?
bill

I don't have the foggiest. Hold on I will look it up in Taylor.
Here it is.

A four stroke turbo charged diesel engine with a pressure ratio 
of 2.65:1 operating at a piston speed of 2000 ft per minute has 
a bmep of 217 psi and a BSFC of 0.34. Roughly 25 psi boost
if I am reading it right. Volume 1 page 479.

Pressure ratios can run up to six for some engines like a 2 stroke Napier
Nomad with a bmep of 250 psi. That had an axial flow compressor.

Curve 1 is for turbo charged engines.
Curve 2, interestingly enough, is the for the Caterpillar arrangement
where the turbo charger is geared to the output shaft like I just mentioned.
A simple supercharger type is not on this chart for some strange
reason. These are all intercooled of course.

Cummins runs some what higher piston speed with lower bmep
I think. This was in the late 80's.
 
Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2002 All world wide rights reserved.