Timing help needed

roccodart440 said

Ran it twice last week at the track. All seemed well, but still fat and unhappy at idle.

Contemplating trying out that smaller bushing and bumping the initial up before playing with the carb again.

Not to get off track but does everyone agree that if you are under 1.5 turns on the idle mix screws to go with .010 bigger bleeds and if you are over 2 to go .010 smaller?

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When I do it, I tune the idle circuit so the screws are out 3/4 to 1 turn with 4 corner idle. If you are over 1 turn, IMO you need to either open the IAB up to lean it out, or reduce the IFR to get the idle screws .75 to 1 turn out.

IIRC, the bigger the idle air bleed, the longer you stay on the idle circuit, which may or may not be a good thing.

Again, IMO any carb’d car should be a bit pissed off at cold start. If it’s not, it’s fat at idle.

EDIT: @Mattax I would like to hear what you think.