Re: best possible advise

Posted by Burrhead on December 26, 2000 at 16:28:15 from (12.74.16.90):

In Reply to: best possible advise posted by dave on December 26, 2000 at 13:08:55:

Dave what I've found on every gasoline engine I ever fooled with was this.

To get it right set the valves if they have manual lifters, set the points and plugs at the recommended gaps.

Then leave the timing light put away and tune the engine with a vacuum gage.

At idle speed with the engine warmed up to operating temp- disconnect and cap all vacuum ports to include the spark advance line to the distributer and to the pcv valve, except you leave one port open to connect your vacuum gage.

Run the engine with the vacuum gage hooked up and set the timing and fuel mix screw til you get the engine as smooth running as possible with the vacuum between 17"-22"Hg. With 20" and steady needle reading being the best.

You did'nt mention what engines you use for the recommended timing setting but it does'nt matter because the optimum vacuum is reached only when the timing and fuel mix is adjusted correctly on any engine.

With a vacuum gage you don't need to know the recommended timing degree setting because you are establishing the correct setting for the individual engine. Lights and probes will sometimes lie to you or cause alot of extra work but a vacuum gage won't.

On all gas powered engines the carb vacuum range you asked about should be from 17" to 22" with the reading to the higher end being most power and fuel efficient.

I don't know what the optimum exhaust temp would be, but it will be right if the timing and fuel mix is set right.

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