X-Mozilla-Keys:                                                                                 

Bill Freeman wrote:

I respect your engineering ability, yet this does not square with my
catalog info which is no more than 5 yrs old.  Has there been a major
breakthru in the 'silent' chain world?  If a 1.5" wide chain is good for
200 hp for any appreciable time, why is a typical Detroit cam chain
about 3/4"-1" wide (or so)??  I would expect the cam drive HP to be
 <10 hp on a typical Detroit V8, but this is just a EWAG  (Engineer's
Wild . . .) .  Involute chains that I have seen applied do not seem to
come anywhere near the "new" power ratings.

I am assuming you are correct, but I need to understand why my
past observations of internal involute chain applications and my
design handbooks do not "mesh" with yours ( pun intended)   :-)

Take care.

Bill

I think I know the answer to this Bill. I think the catalog loads
have been oriented to automotive use. I think this chain is for
a 200 HP car engine. This HP rating is for brain dead car engineers :-)
After all the big market is front drive car transmissions.
A car only sees 200 HP and 6500 RPM for less than a second if ever.
That means the average RPM is 2000 and average HP is 30 HP. Jeff, 
I think you have been victimized by this rating method. 

Paul Lamar
 
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