[phoenix]

Hi Rob

Remembering this is only theory I think the Cosworth figure is a bit optimistic, as I get 169 BHP as your likely maximum with 115 ft/lb of torque.

My bet is that the Cosworth A8 cam profile will be similar to what you end up with as optimum, though the A6 may be enough for this engine as it isn't going to be making the revs of the 997/1099 shorter stroke engines.

I don't think you could expect to match a twincam with 1.625" inlet valves which they seem to run over here now, but would be pretty close, maybe 7-9 BHP down, but back in '66-'67 the SCB might well have produced more power than the twincam.

Any details you can let me have of the original cam profile would be a great addition to my library of engine data....

Did the SCB use 4.825" rods like the 1500 116E and the twincam engine?

As for the pistons, the larger engine would need a slightly larger combustion chamber for the same CR ratio, wouldn't it?

Thanks

Martin