Too much timing?

Too much timing?

The other side of the picture is too early means colder combustion conditions, incomplete burns, and lower pressure through the angles of highest leverage on the crank.

reposting this

AJ/FormS said
the one that causes the maximum amount of gas pressure to be delivered to the crank at the exact right time. IIRC this is ~28*ATDC. But I have read other numbers.
As rpm, loads ,temperatures, and elevations, change, the BEGINNING of the gas expansion strategy has to be adjusted to achieve that.

Mattax said
That's the crux of it isn't it.

Whether the piston is 28* or 25* into the power stroke probably depends on the crank arm and rod and stroke ratios. ... Thats one of those little details that makes each engine a little different. But it really doesn't matter, the concept is the same.

For those that may be not following why we're talking about pressure in the cylinder. It's all about maximizing leverage on the crank.

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