Ok, done 1 whole cylinder, took a little while to nut out the shapes I wanted, expecially on the exhaust side.
The exhausts on these things are the real problem, abrupt short turn & not much you can do. So rather than try to perform a miracle I instead concentrated on unloading the turn as much as possible - I threw away all the existing info & port designs & started from scratch with the focus being on getting the correct cross sections in the correct areas, getting the port to taper out as required & unloading the turn.
Intake is also a little different to what I've done in the past, the new chamber shape allows for a more aggressive short turn, which in turn allows for more flare after the miminum cross section just before the guide.
I've gone for a 40mm port at the min cross section, the port tapers down to 40mm (or 1.9^") from around 42mm at the head face, then flares back out.














The exhausts on these things are the real problem, abrupt short turn & not much you can do. So rather than try to perform a miracle I instead concentrated on unloading the turn as much as possible - I threw away all the existing info & port designs & started from scratch with the focus being on getting the correct cross sections in the correct areas, getting the port to taper out as required & unloading the turn.
Intake is also a little different to what I've done in the past, the new chamber shape allows for a more aggressive short turn, which in turn allows for more flare after the miminum cross section just before the guide.
I've gone for a 40mm port at the min cross section, the port tapers down to 40mm (or 1.9^") from around 42mm at the head face, then flares back out.















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