![]() That would give you a 0.034" quench and a 10. Diamond’s ring compressors are precision machined from heat treated aluminum and hard anodized for years of use, for the builder who does a lot of repeat bore sizes. Speed-pro do a piston with a 21cc dome #L2240NF30ĭeck the block so the piston is 5 thou above the deck, and use an "off the shelf" Felpro 0.039" head gasket. Simply fill in the form below to calculate your compression ratio. Here is the Summit listing, It shows a 4.124 boreĪfter CCing the heads, If it comes out at 101.9cc as being speculated. BBC STROKER Static Compression Ratio 4.310 Bore 12.08 10.89 10.70 10.52 10.26. My advice is to CC the heads to get an accurate number.ĭepending on Head CC and piston to deck clearance, there are plenty of graded head gaskets available.Ĭometic do. There is a lot of dis-information out there īut whenever I have CC'd factory Chevy cylinder heads, they have always been on the high side Ĭhevy's compression ratios were always overly optimistic. Again, you dynamic compression ratio is more important than the static compression ratio.Ĭometic # C5816-060 is a 0.060" compressed thickness gasket that would net a 10.64:1 compression ratio with zero deck clearance.īuy the correct pistons, then measure the deck clearance ġ0.5 :1 compression and a fat cam will really wake up a 396/402 with 3931063 heads.Ĭlick to expand.You are not being a "wise-guy". Your quench will be less than ideal/w pistons. This will net you a 10.8:1 compression with Zero deck clearance. If your block has been Decked to zero you can lower the compression using Felpro # 1071053 which have 0.053" compressed thickness As with all Speedmaster cylinder heads, our Big Block Chevrolet heads are Gravity Die Cast. To determine the compression, three things about the engine must first be known: block height, connecting rod length and crankshaft stroke length. As shown, compression height is the distance between the centerline of the pin bore and the top of the piston. With those pistons and an off the shelf Felpro # 1027 head gaskets should get you 10.7: 1 compression Before selecting a piston, the desired compression height must be known. Of the variables, the most important is cam timing which has a dramatic effect on your 'dynamic' as opposed to your static compression ratio. The piston you need is "Sealed Power" L2242NF30 which has a 38.3 cc dome. Use this calculator to see what the effect of bore, stroke, rod length, cam timing, compression ratio, boost pressure and altitude is on your dynamic compression ratio. Hence the - (negative) number in the calculator.They are a semi-closed chamber head which is a lot better than the "Bathtub" closed chamber heads. Same goes for a dome where it is positive cc's on the piston but a reduction in cylinder volume. Hence the positive number in the calculator. If your production is shooting or post producing in a different aspect ratio, please notify. Enter the measurement designation in either inches, 1, or millimeters, 2. ![]() and too much compression can cause glitches so i always use 1. Engine Compression Ratio (CR) Calculator This calculator requires the use of Javascript enabled and capable browsers. Displacement is used to calculate the compression ratio of an engine and. This seems very confusing but it is because even though it is a -cc on the piston, those same cc's are gained in cylinder volume. Computers: Abandonware (DOS) Games Acorn Archimedes ROMs Acorn BBC Micro. Its essentially a measure of the volume of all of the cylinders in a motor combined. The cc for the piston is entered as a positive number on a -cc Dish or Flat top piston and a negative number on a dome piston. Compression Calculator Simply fill in the form below to calculate your compression ratio Bore: (diameter) in. This tool is a very accurate tool and can be tremendously helpful. You can change the head ccs, deck height, overbore size, etc. Apparel, Cups, Decals, Books, Gift Cards Use this compression calculator tool to figure the compression you will get with the specifications you provide.
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