Engine Specifications and Torque Recommendations
| Crankcase nuts | |
| Crankcase 8mm nuts | 15 ft/lbs |
| Crankcase 12mm nuts | 25 ft/lbs |
| Cylinder head nuts | |
| Stock 8mm studs | 18 ft/lbs. |
| Chromoly 8mm studs | 23 ft/lbs |
| 10mm studs | 25 ft/lbs |
| Connecting Rod Bolts | |
| Stock T-1 | 25 ft/lbs. |
| Aftermarket H-Beam/ARP Bolts (or as specified by manufacturer) |
29 ft/lbs |
| Other | |
| Generator Fan Bolt | 40 ft/lbs. |
| Spark Plug | 25 ft/lbs. |
| Oil Drain Plug | 25 ft/lbs. |
| Rocker Arm Shaft Nut | 18 ft/lbs. |
| Clutch Pressure Plate | 18 ft/lbs. |
| Stock Gland Nut | 217 to 250 ft/lbs. |
| Racing Gland Nut | 217 to 250 ft/lbs. |
| Valve Adjusting Nut | 18 ft/lbs. |
How to Calculate Deck Height into CC's
the inch system
Formula - Bore (in.) X Bore (in.m) X Stroke (in.) X 12.87 = Deck in CC
Example - 90.5mm = 3.563" X 3.563" X .060" X 12.87 = 9.80cc
1mm = .03937
or the mm system
Formula - Bore (mm) X Bore (mm) X Deck Height (in.) X .01996 = Deck in CC
Example - 90.5 X 90.5 X .060" X .01996 = 9.80cc
| Deck | Piston - Deck Height in CC's | ||||||
| 85.5 | 87 | 88 | 90 | 90.5 | 92 | 94 | |
| .030 | 4.36 | 4.51 | 4.62 | 4.83 | 4.88 | 5.04 | 5.27 |
| .035 | 5.16 | 5.34 | 5.47 | 5.72 | 5.78 | 5.97 | 6.24 |
| .040 | 5.79 | 6.00 | 6.13 | 6.42 | 6.49 | 6.71 | 7.00 |
| .045 | 6.71 | 6.95 | 7.11 | 7.43 | 7.52 | 7.77 | 8.11 |
| .050 | 7.28 | 7.54 | 7.72 | 8.07 | 8.16 | 8.43 | 8.80 |
| .055 | 8.03 | 8.31 | 8.51 | 8.90 | 9.00 | 9.30 | 9.71 |
| .060 | 8.72 | 9.03 | 9.24 | 9.66 | 9.77 | 10.09 | 10.54 |
| .065 | 9.46 | 9.80 | 10.03 | 10.49 | 10.60 | 10.96 | 11.44 |
| .070 | 10.15 | 10.51 | 10.75 | 11.25 | 11.37 | 11.76 | 12.27 |
| .075 | 10.90 | 11.28 | 11.55 | 12.08 | 12.21 | 12.62 | 13.17 |
| .080 | 11.64 | 12.06 | 12.34 | 12.90 | 13.05 | 13.48 | 14.08 |
| .085 | 12.33 | 12.77 | 13.06 | 13.76 | 13.82 | 14.28 | 14.91 |
How to Calculate Engine CC's
Formula - Bore (mm) X Bore (mm) X Stroke (mm) X 3.1416" = Engine cc
Example - 90.5 X 90.5 X 69mm X 3.1416 = 1775cc (to get the Volume of 1 cylinder in CC divide by 4)
Example - 1775 ÷ 4 = 443.75
| Bore | Stroke - Engine Displacement in CC's | ||||||
| 64 | 69 | 74 | 76 | 78 | 82 | 84 | |
| 77 | 1192* | 1286* | 1378 | 1415 | 1453 | 1527 | |
| 83 | 1385 | 1493* | 1601 | 1644 | 1688 | 1774 | 1818 |
| 85.5 | 1496 | 1584* | 1699 | 1745 | 1791 | 1882 | 1929 |
| 87 | 1521 | 1640 | 1759 | 1806 | 1855 | 1949 | 1997 |
| 88 | 1556 | 1678 | 1799 | 1848 | 1898 | 1994 | 2044 |
| 90 | 1628 | 1755 | 1882 | 1933 | 1985 | 2086 | 2138 |
| 90.5 | 1646 | 1776 | 1903 | 1955 | 2007 | 2110 | 2160 |
| 92 | 1700 | 1835 | 1967 | 2020 | 2074 | 2180 | 2232 |
| 94 | 1776 | 1915 | 2052 | 2109 | 2165 | 2275 | 2332 |
| *1192 = 1200cc Engine | *1493 = 1500cc Engine | ||||||
| *1286 = 1300cc Engine | *1584 = 1600cc Engine | ||||||
Helpful Calculators
These Windows only calculators can help you with your car.
Compression Ratio Calculator
This calculator is for determining the compression ratio of your engine. Knowing your enginesʼ compression ratio is a MUST when assembling or rebuilding it. Your CR determines your fuel type, engine heating characteristics, horsepower and longevity. For street applications it is recommended that your CR is between 7.7:1 and 8.0:1. For other applications please call us and we can give advise based on your enginesʼ variables. Download ACVWCR.exe here by right-clicking and saving the program to your computer.
Transaxle Gearing Calculator
This calculator / graph allows you to see what effect your tire size has on your engine RPMs as well as allowing you to select proper gearing for your new transaxle. For extended cruising we recommend that you run your engine between 3200 and 3800 RPMs for proper cooling of your air-cooled engine. Download ACVWGears.exe here by right-clicking and saving the program to your computer.