Engine Formulas, Conversion Tables & Technical Data
Within this page, I have tried to include every formula, conversion & pertinent tech data table necessary to help the home builder when planning or building an engine. Please note that there will be other calculations needed when building all out race engines, but that's NOT what I'm familiar with, nor who I'm catering to on this site. If you feel something else should be added, please don't hesitate to let me know as this site and all info contained is for the benefit of VW enthusiasts everywhere.
Engine Displacement Table; Most Popular Bores & Strokes
|
BORE |
STROKE Engine Displacement In CC's |
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| 64 | 69 | 74 | 76 | 78.4 | 82 | |
| 77 | 1192* | 1286** | 1378 | 1415 | 1460 | 1527 |
| 83 | 1385 | 1493+ | 1601 | 1644 | 1696 | 1774 |
| 85.5 | 1496 | 1584++ | 1699 | 1745 | 1800 | 1882 |
| 87 | 1521 | 1641 | 1759 | 1806 | 1863 | 1949 |
| 88 | 1556 | 1679 | 1799 | 1848 | 1906 | 1994 |
| 90.5 | 1646 | 1776 | 1903 | 1955 | 2016 | 2110 |
| 92 | 1700 | 1835 | 1967 | 2020 | 2084 | 2180 |
| 94 | 1776 | 1915 | 2052 | 2109 | 2175 | 2275 |
| * Stock
1200cc; ** Stock 1300cc; +
Stock 1500cc; ++ Stock 1600cc
GREEN background denotes the most popular displacement upgrades. |
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Formula: Engine Displacement (CC's)
BORE (mm) X BORE (mm) X STROKE (mm) X .0031416 = Engine Displacement in CC's
Example: 87 X 87 X 69 X .0031416 = 1641cc
To get the volume for one (1) cylinder in CC's, simply divide by four (4).
Example: 1641 ÷ 4 = 410.25cc
Deck Volume Table (CC's)
|
DECK HEIGHT |
PISTON SIZE Deck Height In CC's |
|||||
| 85.5 | 87 | 88 | 90.5 | 92 | 94 | |
| .030" | 4.36 | 4.51 | 4.62 | 4.88 | 5.04 | 5.27 |
| .035" | 5.16 | 5.34 | 5.47 | 5.78 | 5.97 | 6.24 |
| .040" | 5.79 | 6.00 | 6.13 | 6.49 | 6.71 | 7.00 |
| .045" | 6.71 | 6.54 | 7.11 | 7.52 | 7.77 | 8.11 |
| .050" | 7.28 | 6.95 | 7.72 | 8.16 | 8.43 | 8.80 |
| .055" | 8.03 | 8.31 | 8.51 | 9.00 | 9.30 | 9.71 |
| .060" | 8.72 | 9.03 | 9.24 | 9.77 | 10.09 | 10.54 |
| .065" | 9.46 | 9.80 | 10.03 | 10.60 | 10.96 | 11.44 |
| .070" | 10.15 | 10.51 | 10.75 | 11.37 | 11.76 | 12.27 |
| .075" | 10.90 | 11.28 | 11.55 | 12.21 | 12.62 | 13.17 |
| .080" | 11.64 | 12.06 | 12.34 | 13.05 | 13.48 | 14.08 |
| .085" | 12.33 | 12.77 | 13.06 | 13.82 | 14.28 | 14.91 |
Formula: Deck Volume (CC's)
In MILLIMETERS: BORE (mm) X BORE (mm) X DECK HEIGHT (in.) X .01996 = Deck Volume
Example: 87 X 87 X .060" X .01996 = 9.06cc
In INCHES: BORE (in.) X BORE (in.) X DECK HEIGHT (in.) X 12.87 = Deck Volume
Example: 3.425 X 3.425 X .060 X 12.87 = 9.06cc
Formula: Compression Ratio (CR)
(HEADcc + DECKcc + 1 CYLINDER VOLUME) ÷ (HEADcc + DECKcc) = CR
Example: (50cc + 9.06cc + 410.25cc) ÷ (50cc + 9.06cc) = 7.95 OR 7.95:1
Or: 469.31 ÷ 59.06 = 7.95 OR 7.95:1
Engine Torque Specification Table
| FASTENER | ft. lbs. | mkg | FASTENER | ft. lbs. | mkg |
| Connecting Rod Nuts | 22-25 | 3.0-3.5 | Oil Drain Plug | 25 | 3.5 |
| Crankcase Nuts (12mm) | 18 | 2.5 | Oil Pump Nuts | 14 | 2.0 |
| Crankcase Nuts (8mm) | 14 | 2.0 | Clutch To Flywheel Bolts | 18 | 2.5 |
| Cylinder Head Nuts (10mm) | 23 | 3.2 | Spark Plugs | 22-29 | 3.0-4.0 |
| Cylinder Head Nuts (8mm) | 18 | 2.5 | Generator Pulley Nut | 40-47 | 5.5-6.5 |
| Rocker Shaft Nuts | 14-18 | 2.0-2.5 | Fan Nut | 40-47 | 5.5-6.5 |
| Crankshaft To Flywheel Bolt | 253 | 35.0 | Crankshaft Pulley Bolt | 29-36 | 4.0-5.0 |
| Sump Screen Nuts | 5 | 0.7 | Engine To Transmission | 22 | 3.0 |
Basic Tune-up Data
|
Idle Speed (Carbureted) |
Manual Transmission - 850 rpm ± 50 rpm |
| Automatic Transmission - 950 rpm ± 50 rpm | |
| Firing Order | 1 - 4 - 3 - 2 |
| Point Gap | .016" - .020" (0.40mm - 0.50mm) |
| Dwell Angle | NEW Points: 44° - 50° ; USED Points: 42° - 58° |
| Spark Plug Electrode Gap | .028" (0.70mm) |
Engine Origin Charts & Stock Rated HP (By Vehicle Type)
| TYPE - 1 (Beetle) | TYPE - 2 (Transporter) | ||||||
| YEAR | STARTING ENGINE # | CAPACITY | RATED HP | YEAR | STARTING ENGINE # | CAPACITY | RATED HP |
| 1978 | AJ-0-119-668 | 1600cc | 48 | 1978 | GE-0-007-083 | 2000cc | 70 |
| 1977 | AJ-0-095-936 | 1600cc | 48 | 1977 | GE-0-000-001 | 2000cc | 70 |
| 1976 | AJ-0-012-406 | 1600cc | 48 | 1976 | GD-0-000-001 | 2000cc | 70 |
| 1975 | AJ-0-000-001 | 1600cc | 48 | 1975 | ED-0-000-640 | 1800cc | 70 |
| 1974 | AK-0-239-365 | 1600cc | 48 | 1974 | CB-0-101-139 | 1800cc | 66 |
| 1973 | AK-0-000-001 | 1600cc | 48 | 1973 | CD-0-000-001 | 1800cc | 62 |
| 1972 | AE-0-558-001 | 1600cc | 60 | 1972 | CB-0-000-001 | 1700cc | 66 |
| 1971 | AE-0-000-001 | 1600cc | 60 | 1971 | AE-0-000-001 | 1600cc | 57 |
| 1970 | B-6-000-001 | 1600cc | 57 | 1970 | B-5-116-437 | 1600cc | 57 |
| 1969 | H-5-414-586 | 1600cc | 57 | 1969 | B-5-050-174 | 1600cc | 57 |
| 1968 | H-5-000-001 | 1500cc | 53 | 1968 | B-5-000-000 | 1600cc | 57 |
| 1967 | H-0-204-001 | 1500cc | 53 | 1967 | H-0-183-373 | 1500cc | 53 |
| 1966 | F-0-000-001 | 1300cc | 50 | 1966 | H-0-000-001 | 1500cc | 53 |
| 1965 | 8-796-623 | 1200cc | 40 | 1965 | 8-713-768 | 1200cc | 40 |
| 1964 | 7-893-119 | 1200cc | 40 | 1964 | 7-143-543 | 1200cc | 40 |
| 1963 | 6-935-204 | 1200cc | 40 | 1963 | 6-914-251 | 1200cc | 40 |
| 1962 | 5-985-948 | 1200cc | 40 | 1962 | 5-979-934 | 1200cc | 40 |
| 1961 | 5-000-001 | 1200cc | 40 | 1961 | 5-000-001 | 1200cc | 40 |
| 1960 | 3-072-320 | 1200cc | 40 | 1960 | 3-400-000 | 1200cc | 40 |
|
Engines earlier than 1960 are different than those discussed on this website and therefore will not be included in this table. |
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Formula: Gear Ratio
MPH = (RPM X TIRE DIAMETER (In.) ) ÷ (DRIVE RATIO X 336)
Example: (4000 X 27") ÷ (4.22 X 336) = 76.2 MPH
OR: 108,000 ÷ 1,417.92 = 76.2 MPH
This example is figured at 4,000 RPMs running a 4.12 R&P w/ a 0.82 4th gear and 1.25:1 reduction boxes.
RPM = (MPH X DRIVE RATIO X 336) ÷ TIRE DIAMETER (in.)
Example: (65 MPH X 4.22 X 336) ÷ 27" = 3413.5 RPMs
OR: 92164.8 ÷ 27 = 3413.5 RPMs
This example is figured with 27" diameter tires running a 4.12 R&P w/ a 0.82 4th gear and 1.25:1 reduction boxes.
Copyright © 2002 Nate's
WaterArt. All rights reserved.
Revised: August 28, 2003
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