Technical > Matt Shaff's Engine Shop

Opniions on why

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wideopen231:
Ok so now we are resorting to name dropping.LOL  Have to say you have pretty good sources.

dreracecar:
He's 97 and has lunch at the same burger stand every day, sometimes its just me and other times, a group of us. I fear the day when he does not show up

THE FRENCHTOWN FLYER:

--- Quote from: dreracecar on March 04, 2019, 02:58:55 PM ---Had lunch with Isky today  and tried to explain you situation, He laughed, said don't worry about the exhaust, its all about the intake. He's tried  More than- same as -less than and found nothing

--- End quote ---

YUP.
That is my feeling too. When you think about it, the preponderance of the exhaust mass flow happens soon after exhaust valve starts opening, when cylinder pressures are still relatively high (on the order of 100 psi).
That is the "blow down" phase.

 And the final purge of exhaust gasses comes at the end of the exhaust event.
That is the "pump-down" phase. Again, at low valve lifts.

So if you really want to help things out concentrate your exhaust side efforts on achieving the greatest possible exhaust flow at the low exhaust valve lifts.

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