That's the problem with high output internal combustion engines -- with
the way physics works, you gradually end up having to pick an rpm range
for max output because all the compromises only work there...
Those engines would toss a rod if you forced them to go faster than
2200 rpm -- something about keeping the con rod cap bolts intact as you
jerk the piston up and down -- eventually you exceed the material
strength and pull the cap off on an intake stroke.
A 500 rpm power band is VERY hard to operate in -- I've seen more than
one older truck grinding up a long grade (like 7%) in a very low gear
because some idiot cut the driver off and he missed a gear and couldn't
upshift on the slope.
Peter
On Monday, October 24, 2005, at 12:33 AM, Fmiser wrote:
rumor has it that Peter wrote:
Snip a bunch of stuff
This was a major problem when speed limits were
lowered in teh 70s as most trucks were running at the wrong rpm -- in
those days, the power band was as small as 1900-2200 rpm!
I don't know what engines you are thinking of, but the 15L engines that
_I'm_ familiar with have a power band of 500-800 RPM. Shoot, most of
the 15L engines won't go much faster than 2200 RPM under load!
Other than this little nit-pic, I enjoyed the post!! Good stuff.
Philip, who likes diesels and Mercedes
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