Quote:
Originally Posted by Cliff R
The power loss for compression formula doesn't hold water, never did. We choose the camshaft based on the compression and CID. A cam that works well for 400cid at 10 to 1 compression is NOT as good of a choice at 9 to 1. For every full point of compression the cam needs to be about 10 degrees smaller, to keep idle quality, off idle power, and torque production in the lower rpm range on par with the larger camshaft in the higher CR engine.
What we are seeing here is typical choosing a camshaft that is too big for the application. It would be a LOT happier with something closer to an 068 grind...IMHO.....Cliff
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Here's an example of over camming an engine for return. Above I posted all the major details of building a 400 w/#60916 cam running 12.50's @107 mph. I tried changing the #16 cam to a Crower #60311 w/1.65's, Torker II intake w/1" spacer, and 3800 converter in an effort to go fast. WELL RESULTS: The damn car ran the same ET! I mean there wasn't more than .01 difference between them. But with the larger solid cam combo I had to raise my shift rpm from 5600-5800 to 6500 rpm's to get it to respond!!!
Now that was a diminished return on investment by grossly over camming. LOL
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Good luck to the new owner of the Ventura II! Sold the car after 13+ years. Look for it on the Hot Rod Power Tour in the future as it's currently being re-configured as a Pro-Touring ride!
