Mike Marron wrote:

(Peter Stickney) wrote:





Allison also Diesel engines for use in tractor-trailers & other such
applications. You can easily pick 'em out by ear, they've got a
distinctive high-frequency scream in their engine note.



I'm not aware of any Allison diesel engines used in semis. The Big
Three truck engine manufacturers are Caterpillar, Cummins and Detroit
Diesel. Going down the road, you can't differentiate between the three
by the sound alone and I suspect the high-freqency scream you're
referring to is simply the turbo.



Stick International in there. You can't look out your car window
without seeing something powered by a DT466E. Yup, no such animal as an
Allison diesel. But plenty of World transmissions! As far as noise,
you can tell a 6V-8V 92 from others, but that's because it's big, dirty
and ugly! Most days now though, the manufacters make all of them sound
like purring kittens! Until that Jake Brake wakes you up in the middle
of the night.