RE: turbos

[mark stegmann <truckdriver_1977@xxxxxxxxx>]

> on this same subject, the Crismon book quotes IH
> literature referring to the
> 4-152T as "with 115 horsepower on demand" (Crismon,
> P. 357, bottom left,
> Champagne Scout caption), and "turbocharger which
> kicked in and then
> produced exra horsepower when required, with a
> noticeable drop in fuel
> mileage" (Crismon, page 379, 4th paragraph).  what
> exactly does that mean?
> i thought turbochargers were fulltime, not "on
> demand".  what gives?  is
> this a misprint or was the turbo on the 4-152T a
> part-time operation?  can
> someone explain this to me, please?
> 

Mac,
This is a guess, but I'll bet they mean that the
engine had 115 hp before the turbo was added. There is
no on/off switch for a turbo, and I doubt there's ever
been one on a belt driven supercharger, though with an
electric clutch(similar to the one on an AC
compressor) you could probably make one. But if you
think about it, you could maybe adapt that to an
exhaust driven turbo with some fancy engineering.

Mark



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