Ignition Timing and Idle Speed

JasonC

I have a 2,332cc motor equipped with twin Solex/Kadron carburetors and Magnaspark distributor and coil.

When I set the timing to 30-degrees BTDC at 3,000 rpm, I can't idle the engine down to 900-1,000 rpm, notwithstanding the idle-stop screws backed all the way out. So my resolve was to retard the timing until I could idle the motor at 1,000 rpms with the throttle-stop screws just barely supporting the throttle plates.

Has anyone experienced this phenomenon and if so, did you live with it or correct it?

Thanks!

Jason

3/3/234:46 AM

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DannyP

Maybe your throttle cable needs to be loosened? You could still be pulling the throttles open slightly even if the stop screws are backed out.

Or you have a vacuum leak.

Most guys on here have either Weber or Dell one barrel per cylinder carbs(Weber IDF or Dell DRLA).

I do know that the intake manifolds used with the Solex carbs should have a built-in channel to let air leak between the intake ports. You should contact the engine builder to verify what to do if the problem isn't in the linkage or a vacuum leak.

3/3/237:22 AM

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JasonC

@DannyP posted:
Maybe your throttle cable needs to be loosened? You could still be pulling the throttles open slightly even if the stop screws are backed out.
Or you have a vacuum leak.
Most guys on here have either Weber or Dell one barrel per cylinder carbs(Weber IDF or Dell DRLA).
I do know that the intake manifolds used with the Solex carbs should have a built-in channel to let air leak between the intake ports. You should contact the engine builder to verify what to do if the problem isn't in the linkage or a vacuum leak.

Thank you for the suggestions.

Jason

3/3/234:30 PM

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