Testing Cam Position and Collector Length

[RevTheory]

If you were on the dyno and wanted to get both sorted out, which one would you start with?

Me thinks collector length but I can imagine wanting to go back to double-check once the cam is where you want it.

[gmrocket]

If you were on the dyno and wanted to get both sorted out, which one would you start with?

Me thinks collector length but I can imagine wanting to go back to double-check once the cam is where you want it.

one of the speakers at the Race Engine Challenge gave a pretty detailed procedure on tuning for max power. exhaust was last

[RevTheory]

I remember Dan's EMC team (RIP) 5 or 6 years ago being pressed for time on testing and lamenting that they didn't get into collector length sooner.

[SchmidtMotorWorks]

Worth watching all the way through, to have efficient dyno testing.

https://www.youtube.com/watch?v=hTviHGsl5ag


Then look at this:

https://www.youtube.com/watch?v=d5jOrZL148w

[modok]

If you have dual cams I'd start with a lot of overlap, and see what happens with the collector first.

[RevTheory]

Thank you for the feedback, gentlemen.

[CGT]

I would do the exhaust mods last.

[GARY C]

With an 18" collector being a pretty safe universal length, would it be best to start your dyno test with that and the fine tune at the end?

[MadBill]

Good plan.