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Old 02-17-2010, 05:36 PM
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10.5:1 static compression ratio is gonna require a cam with a 0.050" duration of around 235 degrees. Such a cam is gonna make power from 3000 to 6500 rpm's. So, gettin' "up on the cam" is gonna take some pretty short gears to tow within the posted speed limits. For instance, towing at 3500 rpm's with a 4.56:1 final drive and 28" tall tire will have the vehicle going 63.9 mph.

Now, let's look at another scenario. If you had finalized the SCR of the motor at, for instance, 8.75:1, then you could have used a cam like the one in the example above, making power from 1200 to 5000. Now, with the same tire, 3.10 gear and turning only 2350 rpm, you would be going the same 63 mph. You'd be "up on the cam" and everything would be hummin'.

Last edited by techinspector1; 02-17-2010 at 05:49 PM.
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