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.

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