Eric's cam challenge

273 said

Everyone generally says get a custom cam, but now all a sudden it's guessing and a pointless test,

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If you cant tune it then its a pointless test. Different cams create different intake and exhaust events that take place. Any change will change the residual gas species left in the cylinder requiring a different tune to account for the increase or decrease in CO left in the chamber. If you under or over scavenge the chamber it needs a different tune.

Different engine combinations create different vacuum profiles that need to be tuned for. There are way more variables that a list of mechanical parts. Its how those parts affect the chemistry of the burn that needs to be addressed.

Does it need more fuel or less fuel does it need more timing or less timing to place the PPP at the correct and most advantageous crank angle. If one camshaft creates a leaner intake fill then the timing needs to be altered to get the burn started at the right time.