Then add (1, 2, 3, 4, 5) and divide by (1, 2, 3, 4)įor best accuracy also calculate the piston clearance volume above the #1 ring land. Convert all measurements into the same units, preferably cc's. Then determine (5) swept volume which is the stroke distance of the piston times cylinder area. This volume includes (1) chamber volume, (2) piston volume, (3) gasket volume, and (4)deck clearance volume. which is swept volume plus all volume above the piston. To calculate compression, determine total cylinder volume. Measure volume before and after any cylinder head work. Use a scientific grade buret to get the most accurate measurements. Measure the piston valve relief / dish volumes. Keep in mind that valve placement in the chamber effects chamber volume, as does the type of spark plug used. Don't use an online calculator with catalog measurements or you could end up screwed. Make real measurements to calculate compression. It's been 16 years since I messed with a Stock Eliminator engine so consult your rulebook. Of course this info is dated and may not apply. Mininmum deck clearance was -0.005" and a stock steel gasket was utilized. Chamber size was limited to 73 cc's, factory replacement piston only. Not a HiPo version this was the available 4 BBL 390, Tri-Powers were rated at 330 HP. Roughly the ame engine you are talking about, 300 HP 390. I tried to run a 64 Galaxie 500XL in Stock Eliminator in the early 90's.
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