What might be the problem w/my #4 cyl and the spark plug???
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What might be the problem w/my #4 cyl and the spark plug???
Some people call it the shoulder strap, wikipedia calls it the side electrode. Anyways, what are some options when the side electrode bends over and touches the center electrode. Basically closing the gap. It's got a tiny nick on the side of the electrode as if something hit it. Car was running funny, then put a new spark plug in and it's running like a champ again. Checked the compression and it's perfectly fine. It's done this twice. The first time I was hoping for a fluke, but it's done it again, so now I'm counting my blessings I didn't hurt anything. What are some possibilities from you FI experts. Oh, and it's got a paxton on it making about 15lbs. of boost. Thanks!--Andy
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Unfortunately I regapped the plug. So I don't have a pic of what it looked like. Could it be a main bearing gone to crap?
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There's a few nicks on the top of the piston, about where it'd hit the spark plug. Compression is still good though. My latest thought is worn out rod bearing?
#17
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big end bearing wear or wrong clearances
cylinder head machined excessively , too much taken off
block machined excessively, wrongly set up in mill
wrong spark plug reach or type of plug, there is a 3/4 reach and shorter...plus projected plugs , and non projected...
it that a brilliant answer or what ???
Quote:
It's got a tiny nick on the side of the electrode as if something hit it.
Last edited by crashly; 09-30-2009 at 12:43 AM.
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piston rocking in the bore : wrong piston clearance or wrong pistons
big end bearing wear or wrong clearances
cylinder head machined excessively , too much taken off
block machined excessively, wrongly set up in mill
wrong spark plug reach or type of plug, there is a 3/4 reach and shorter...plus projected plugs , and non projected...
it that a brilliant answer or what ???
Quote:
It's got a tiny nick on the side of the electrode as if something hit it.
big end bearing wear or wrong clearances
cylinder head machined excessively , too much taken off
block machined excessively, wrongly set up in mill
wrong spark plug reach or type of plug, there is a 3/4 reach and shorter...plus projected plugs , and non projected...
it that a brilliant answer or what ???
Quote:
It's got a tiny nick on the side of the electrode as if something hit it.
Now, if the heads or block were milled excessively, would I not be hitting other spark plugs?
Could it be just as simple as buying a shorter spark plug? None of the other plugs the same length hit...
I was told by a very informative guy that he thingks its the rod bearing which makes sense. Allowing it to stretch a little at high rpms. Thoughts???