45 DCOE tuning experience - not too bad (long) (archive)

This turned out to be simpler than I thought, however there are a few anomolies that I would appreciate comments on. Overall the car idles smoother, there is no hesitation on acceleration, and the power is more consistant throughout the RPM range (power dropping off at above 5500 - 6000 RPMs which sounds about right for the cam (268). Valves have not been checked / adjusted.

I think I need to get a sync tool as I really could not judge too well between the pairs (perhaps they were close to start with?).

Venturies are 34. I did not brave removing the jets to see what was there - next time.

On to the anomolies:

a) When listening with the hose, there was a distinct tappa ... tappa ... tappa ... tappa sound that you could not hear without aid of the hose (valves need adjusting?) This sound was only from cylinders 3 and 4.

b)When disconnecting different plug wires, the RPMs dropped off the most when cyl 1 and 4 were disconnected. The order of difference from greatest to least was 1 4 3 2. I tried adjusting the idle mix to try and make it more noticable when 2 was disconnected but could not. Same with 3.

Questions beyond comments on a and b:

Is the idle setting screw (not idle mix) how you vary the amount air? Some of the items I have read talk about a balance screw which I think is a line between each throat which I do not have.

I did not run the engine on only cyls 1 and 2 and then 3 and 4. Would this be a worthwile exercise to adjust the idle setting (not idle mix) between the carbs?

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