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Speaking on OHC type 4 engines, has anybody ever heard of the 'Overfly' engine that Rolf Holzapfel developed for the Kaefer Cup?
Alex maybe?
It was a new development in 1995 from Holzapfel in which he also used the Porsche 964 cylinder heads AND the 100mm cylinders and pistons. He also used those with a 86mm stroke SCAT crank to give exactly 2,7 ltr.
He used a cam housing that his tuning workshop made themselves.
The test engine with 10,4 compression and self developed Melcher cams produced 247 (DIN) hp at 6250 rpm and 294 Nm at 5500 rpm! The engine used twin spark (from the dual spark 964 heads) and 51mm Weber carbs.
Personally I don't understand how you can use the stock 100mm cylinders which ran with 76,4 mm stroke in the 964 engine for 86mm stroke, but the picture in the german mag 'Gute Fahrt' showed all these parts indeed together!
Unfortunately these never did make it into the Kaefer Cup due to the 2 liter restriction the following year(s).
As you would supect, everything has been done already by some one.
Greetings,
Walter
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