Re: Engine analysis needed here ....

Posted by buickanddeere on May 27, 2006 at 08:08:29 from (216.183.151.202):

In Reply to: Engine analysis needed here .... posted by Way Up Here on May 26, 2006 at 06:25:47:

When at idle the intake manifold is under high vacuum,low flow volume and slow flow velocity.
All the oil that has seeped through the valve guides.And all the droplets of gasoline stuck to the side of the manifold and puddled wet on the bottom of the manifold. Is just sitting there waiting.
Now when you give the throttle a snort and rev her up.There is a few seconds where that accumulated oil/gasoline will be drawn into the combustion chambers and cause a smoke show.
It's the nature of the beast having a carburated/wet intake manifold. That's why auto manuafctures went to fuel injection. Unless the manifold is dry and the fuel squirted into the cylinders just behind the intake valves. There will be a momentary over rich condiiton every time the carburator throttle is opened/rpms increased from low power/low rpm conditions.
High vacuum caused by a clean appearing but internally plugged oilbath aircleaner/pipework will contribute to smoke as well.
So replace the valve guides and valves. Set the idle screws as lean as the engine will run without missing. Keep the coolant at 195 which helps warm the manifold. And use manifold heat if avalable on gassers that just putt around and don't plough at full power all day.

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