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REFERENCE

Engine Specifications

Explore our comprehensive database of Classic Mini engine specifications. Find detailed information about bore sizes, stroke lengths, power outputs, and more for various Classic Mini engines.

Compression Calculator

Calculate the compression ratio for your Classic Mini engine.

Standard bore and stroke Standard stroke, overbore Different stroke

Engine Specifications

Original Block	Engine Size	Bore Size	Over Bore	Stroke	Est. Power	Est. Torque
850	850cc	2.58" / 62.9mm	----	2.688" / 68.26mm (std)	34bhp	44lb/ft
997	997cc	2.458 / 62.43mm	----	3.200" / 81.28mm (std)	55bhp	54lb/ft
998	998cc	2.543" / 64.57mm	----	3.000" / 76.20mm (std)	41bhp	52lb/ft
998	1014cc	2.563" / 65.09mm	+020	3.000" / 76.20mm (std)	----	----
998	1030cc	2.583" / 65.60mm	+040	3.000" / 76.20mm (std)	----	----
998	1046cc	2.603" / 66.10mm	+060	3.000" / 76.20mm (std)	----	----
998	1062cc	2.62" / 66.61mm	+080	3.000" / 76.20mm (std)	----	----
1100 - (998)	1098cc	2.543" / 64.58mm	----	3.296" / 83.72mm	45bhp	56ft/lb
1100 - (998)	1114cc	2.563" / 65.09mm	+020	3.296" / 83.72mm	----	----
1100 - (998)	1132cc	2.583" / 65.60mm	+040	3.296" / 83.72mm	----	----
1100 - (998)	1149cc	2.603" / 66.10mm	+060	3.296" / 83.72mm	----	----
1100 - (998)	1167cc	2.62" / 66.61mm	+080	3.296" / 83.72mm	----	----
1100 - (998)	1216cc	2.68" / 68mm	68mm	3.296" / 83.72mm	----	----
1275	1275cc	2.78" / 70.6mm	----	3.200" / 81.28mm (std)	63bhp	70lb/ft
1275	1293cc	2.801" / 71.145mm	+020	3.200" / 81.28mm (std)	----	----
1275	1302cc	2.811" / 71.4mm	+030	3.200" / 81.28mm (std)	----	----
1275	1311cc	2.821" / 71.65mm	+040	3.200" / 81.28mm (std)	----	----
1275	1330cc	2.841" / 72.16mm	+060	3.200" / 81.28mm (std)	----	----
1275	1361cc	73mm	73.00	3.200" / 81.28mm (std)	----	----
1275	1379cc	73.5mm	73.50	3.200" / 81.28mm (std)	----	----
1275	1398cc	74mm	74.00	3.200" / 81.28mm (std)	----	----
1275	1406cc	73mm	73.00	84.00mm	----	----
1275	1426cc	73.5mm	73.50	84.00mm	----	----
1275	1440cc	73mm	73.00	86.00mm	----	----
1275	1460cc	73.5mm	73.50	86.00mm	----	----
1275	1479cc	74mm	74.00	86.00mm	----	----

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