DISPLACMENT CHART
|
83mm |
85.5mm |
87mm |
88mm |
90mm Bore |
90.5mm Bore |
92mm Bore |
94mm Bore |
|
| 64
mm. (Stroke) |
1385 | 1470 | 1522 | 1557 | 1629 | 1647 | 1702 | 1777 |
| 69
mm. (Stroke) |
1493 | 1585 | 1641 | 1679 | 1756 | 1775 | 1835 | 1915 |
| 74
mm. (Stroke) |
1602 | 1699 | 1760 | 1800 | 1883 | 1904 | 1968 | 2054 |
| 78
mm. (Stroke) |
1688 | 1791 | 1855 | 1897 | 1985 | 2007 | 2074 | 2165 |
| 82
mm. (Stroke) |
1775 | 1883 | 1950 | 1995 | 2087 | 2110 | 2180 | 2276 |
| 84
mm. (Stroke) |
1818 | 1929 | 1997 | 2044 | 2138 | 2161 | 2234 | 2332 |
| 86
mm. (Stroke) |
1861 | 1975 | 2045 | 2092 | 2188 | 2213 | 2287 | 2387 |
| 88
mm. (Stroke) |
1905 | 2021 | 2093 | 2141 | 2239 | 2264 | 2340 | 2443 |
Note concerning case boring -
When cutting a case for late 90.5 or 92mm cylinders there's very little left of the ledge that the cylinder must seat on*. It depends upon the individual casting, but in many cases (pun intended) you need to "deck" the seating surface clear down to the side of the block to establish a flat area of sufficient width. Spacers will be needed to regain any deck height lost by that process. The difference in compression height (wrist pin location) between an "A" and a "B" piston is ~ 5.6mm. This means that all other things being equal a "B" piston would yield the same deck with an 80.2mm stroke as an "A" would with a stock 69mm stroke. An additional 1.8mm stroke is going to require .9mm in shim thickness to maintain that same deck. You may not be able to achieve your desired compression ratio without additional deck height, either. It's safe to assume that you'll need some cylinder spacers - but you really can't accurately predict how much until you mock-up the engine.
*this absolutely MUST be done in all cases with 94mm cylinders, and their "out-of-the-box" deck height takes that into account.
1 Diplacement Table
2 Maint. Intervals
3 Valve Adjustment
4 Engine Calculator
5 Essential Tools
6 Type 1 Changes
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