Completely off topic, but a topic that speaks to me. ;o)

Porsche 917 motor.
Started life in 1969 at 4494cc (85 x 66) and 580 horsepower @ 8400
rpm. Naturally aspirated.
In 1972, they increased the bore and stroke to 90 x 70.4 for 5374cc
and 660 hp @ 8300 rpm
Last data Paul Frere gives is the 1972 917/10 Bergspyder at 4994cc
and a pair of Eberspacher turbochargers. 950 hp @ 8000 rpm. 690 lb ft
torque. In a 750kg racecar... I saw them race a few times back in the
day. You cannot imagine what brutal cars they were. A thousand
horsepower in a 1700 lb car. Un-effing-believable. Performance
figures: 0-60 mph 2.1 sec., 0-100 mph, 3.9 sec., 0-200 mph, 13.4 sec.

Source: Paul Frere's "The Racing Porsches" ISBN 0-668-02972-2

Jim

On Jun 11, 2007, at 9:58 PM, mike wrote:

> I think the 917 12 cylinder is bigger than 5 liters but I'm pretty
> sure it's
> much larger than the svx. I saw them when they were racing CAN-AM
> and they
> were very large. Apparently they had a 16 cylinder version waiting
> in case
> they needed more power. But the series folded before they needed it.
>
> Mike
>