Thread: Blown 383 stroker cam selection

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Originally Posted by techinspector1

Probable results of that cam in your motor.....
Your engine summary is as follows:
Bore - 4.03 inches
Stroke - 3.75 inches
Rod c-c length - 5.7 inches
With a static compression ratio of 8.0:1.
Your camshaft specifications call for an inlet valve closing of 85 degrees ABDC (after bottom dead center).
Your chamber volume is 111.98 cc's. With this camshaft your dynamic, or effective stroke is 2.35 inches.
Your dynamic compression ratio is 5.38 :1 corrected for cam timing, altitude, and rod length.
Your dynamic cranking pressure, corrected for cam timing, rod length and altitude is 93.72 PSI.
Your dynamic boost compression ratio, reflecting static c.r., cam timing, altitude, and boost of 8 PSI is 8.31 :1

Richard,111.98 cc chamber volume?
How did you arrive at this number?

Originally Posted by erik erikson

Richard,111.98 cc chamber volume?
How did you arrive at this number?

I didn't, the calculator spit it out as a result of using the bore and stroke and static compression ratio to find the total compressed volume.

I'd like to hear your take on nitro's cam recommendation. I'm just going by the calculator and using 8 to 8 1/2 dcr. Should the dcr be different on a blown application as opposed to naturally aspirated????

Here are the results using a 64* ABDC closing point:
Your engine summary is as follows:
Bore - 4.03 inches
Stroke - 3.75 inches
Rod c-c length - 5.7 inches
With a static compression ratio of 8.0:1.
Your camshaft specifications call for an inlet valve closing of 64 degrees ABDC (after bottom dead center).
Your chamber volume is 111.98 cc's. With this camshaft your dynamic, or effective stroke is 2.95 inches.
Your dynamic compression ratio is 6.50 :1 corrected for cam timing, altitude, and rod length.
Your dynamic cranking pressure, corrected for cam timing, rod length and altitude is 121.02 PSI.
Your dynamic boost compression ratio, reflecting static c.r., cam timing, altitude, and boost of 8 PSI is 10.04 :1.