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Timing map when changing cams.

Started by Harley Pilot, December 16, 2018, 11:07:43 AM

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Harley Pilot

So how do tuners arrive at a start point for timing  when dealing with a cam change? I understand the part about knock sensors and pre ignition, but how do they decide on a minimum starting point?

HD/Wrench

Experience mainly . What type of head is used will give you an idea , comp ratio , and then cam , CCP of set up

So a bathtub 103 head is a faster burn chamber than say a CVO head , S&S head is a very fast burn chamber and thus less timing .

If its an unknown set up you start with something that is close to what you have and work it from there .