On Sun, 08 May 2005 11:34:05 -0500, Don Stauffer
wrote:

Why not just have a small compressed air pump driven by gears from
crankshaft or camshaft, with a tank to store a few "starts" full of
compressed air? Seems like an easier fix than an electric driven
compressor.

And just how much air do you think it would take? If you have a 164 cu
inch engine (2.7 liters) you need 2.7 liters of air at above
atmospheric pressure fore each turn of the engine(2 stroke) for long
enough to get the engine producing enough exhaust heat to spin the
turbo enough to produce boost. Say 5 liters (at atmospheric) per turn
for 45 seconds of running at 1000 RPM - or 2500X5 liters = 12500
liters of compressed air.
Max Kallio wrote:
2-stroke diesels need compressed air for starting the engine, so the
turbo (exhaust driven centrifugal supercharger) is out of a guestion
and it produces very little boost at low rpm anyhow.

How about supplementing a centrifugal turbocharger with a high speed
electric motor to create boost needed for starting and to enhance
boost at low rpm?

This would pretty much eliminate the turbo lag and actually help suck
the exhaust out of the cylinder at low rpm.

When the rpm rises, the electric motor could disengage or perhaps even
work as an auxilary generator.

Also, if the turbo has some problems, the electric motor could be used
at full power to help the turbo to spin and create boost at least for
the time it takes to land safely. Of course, the engine should be
able to have enough power to stay airborne at least at low altitudes
(if the load is not exeeded) even when the turbo fails completely.

Links...

www.turbodyne.com