11-03-2006, 07:30 AM
|
|
very senior member
|
|
Join Date: Apr 2003
Posts: 20,082
 Rozenburg, Holland
|
|
Quote:
|
Originally Posted by greg.harvey
"Over-square" means they are wide bored with a tiny little stroke (as was the Mini Cooper, I believe).
|
Just to add a little on the minis, there was one "Short Stroke Mini", based on the 1071 cc, which used parts of the Formula III BMC engine, but for homologation purposes short stroked to 970 cc displacement. It produced 65 bhp at 6500 bhp, not bad for a ohv engine, and it was known as the "screamer". (borexstroke was 70.6mmX61.91mm) The 1300 Cooper S, had 77 bhp at 5900 rev had the same bore of 70.6mm but stroke was 81.33 mm. More revealing are the torque figures, where the screamer only had 76 NM at 3,500 revs, while the long stroke 1275cc engine 110.6 NM at 3000 revs.
The screamer is the rarest of all mini coopers, with only officially 963 built, 37 short of the 1000 required for homologation in the under 1-litre class.
__________________
"I find the whole business of religion profoundly interesting, but it does mystify me that otherwise intelligent people take it seriously." Douglas Adams
|