289 FIA vintage race engine with Webers

[Gaz64]

Originally Posted by blykins

That camshaft, even with changing the LSA to 112, still has 73° of overlap.

Just randomly changing a cam to a wider LSA doesn't make it "friendly".

Yes, that's correct.

Reducing the overlap by widening the LSA delays the inlet closing point, all else being equal.

So the late closing inlet will still have reversion out the stacks on an IR intake.

One camshaft grind that sticks in my head is for the Cosworth DFV 3.0 V8. 68/86 for the inlet, 86/68 for the exhaust. 136 degrees of overlap. LSA 99. IR intake, Lucas mechanical injection.

Extreme example, I know.

Gary

[moar_carbz]

Originally Posted by Gaz64

Yes, that's correct.

Reducing the overlap by widening the LSA delays the inlet closing point, all else being equal.

So the late closing inlet will still have reversion out the stacks on an IR intake.

One camshaft grind that sticks in my head is for the Cosworth DFV 3.0 V8. 68/86 for the inlet, 86/68 for the exhaust. 136 degrees of overlap. LSA 99. IR intake, Lucas mechanical injection.

Extreme example, I know.

Gary

Wow. The intake closed at 86? What was the reversion like?