Camshaft Reprofiling

Unknown

In a message dated 8/20/03 7:00:49 AM, barto003@tc.umn.edu writes:



<< Is there a significant improvement in performance, Or is

reprofileing the cam shaft a necessity for average performance due to

modern fuel? >>



The cams Hudson used were very typical for their day. Early motors ran at

very low speeds and Hudson's new Super Six, while designed as a high speed

engine from the start, inherited many traditional features. Cam design may not

have been matched to the revolutionary new high speed counterbalanced

crankshaft. Valve overlap was minimal and a more modern profile allows the engine to

breathe more freely producing more power and economy.

Also, the metal valves were made of was not as tough as current metals

and valves burned out frequently. It used to be considered normal to grind the

valves every year. Minimal valve overlap allowed more time on the seat to cool

them.

The profile Geoff uses is a 30's design (as I recall) and very mild by

today's standard. It will not make the motor chug or have a narrow power band as

racing cams can do. As I understand it, the reprofiled cam is only what

Hudson might have done had they thought through the implications of the higher

speeds of the Super Six motor.





Paul O'Neil, Hudson29@aol.com

Fullerton, California USA

www.aerostamp.com



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