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MECHANICAL COMPRESSION RATIOS
OF SPUTHE BIG BORE CYLINDERS

95 cu inch – Compression Ratios  

CHAMBER FLAT TOP PISTONS DISH TOP PISTONS

90cc

8.7:1

7.7:1

86cc

9.0:1

7.9:1

80cc

9.6:1

8.3:1

76cc

10.0:1

8.6:1

72cc

10.4:1

8.9:1

 104 cu inch – Compression Ratios 

CHAMBER FLAT TOP PISTONS DISH TOP PISTONS

90cc

9.4:1

8.3:1

86cc

9.8:1

8.5:1

80cc

10.3:1

8.9:1

76cc

10.8:1

9.3:1

72cc

11.3:1

9.6:1

 Piston Balance Weights 

95 cu inch – 3.780 Standard bore

Flat Top Pistons – 1057 grams

Dish Top Pistons – 1061 grams

104 cu inch – 3.780 Standard bore

Flat Top Pistons – 1042 grams

Dish Top Pistons – 1039 grams


Sputhe Spectre, Bonneville record holder
1650 MPG 1997

 

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