Re: intermitent miss (sputter) no load ONLY!

Posted by Allan in NE on January 08, 2005 at 23:38:35 from (148.63.132.164):

In Reply to: intermitent miss (sputter) no load ONLY! posted by rasputen on January 08, 2005 at 19:56:44:

Ras,

This is just a thought; I've only seen this once before, way back in the 60s and your symptoms nail it to a tee.

Put a vacuum gauge on that thing; if the vacuum drops right when the sputtering is going on, but comes right back up when she clears up, I still think you have a valve problem.

Not a "valve" valve problem, but rather a sloppy guide. If it only does it just at that one, low, "just kinda off idle" speed.

The rotation of the cam is forcing that valve follower sideways, which in turn pushes the valve in it's guide just enough to "cock 'er", which drops the compression, & it makes 'er sputter. Any more speed and she then lifts clean and your sputter goes away.

To really check the guides, have the keepers and springs off and lift the valves just an eighth of an inch or so off the seats. This is the point of most wear and there should be absolutely no sideways play in those stems/guides.

Those guides really get ignored in those old flatheads

Allan

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• Re: intermitent miss (sputter) no load ONLY! rasputen 01:32:53 01/09/05 (0)

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