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SVTPerformance's Chain of Restaurants
Pics and Videos Buffet
Spark plug injection myth
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<blockquote data-quote="Jimmysidecarr" data-source="post: 15611099" data-attributes="member: 11681"><p>Good video, don't get discouraged....... but...</p><p>On the 03s and early 04s with only 4 spark plug threads in the heads, that have blown plugs out of the head, who in the world actually thinks that is was caused by the piston coming up and hitting the plug? That would have to be a very non-gear head, non-car guy type of person. Naive comes to mind. </p><p></p><p>When those few threads fail, it is simply the pressure in the cylinder that blows the plug out. It does not have to be the greater pressure caused by detonation. Additionally the ground strap is typically not hammered closed by the detonation event, it is hammered closed by the on going up and down slamming the plug is subjected to in the plug well of the head as the cylinder alternates between vacuum and compression. The plug is held captive by the coil boot and the coil covers, so it just keeps slamming up and down till the engine is shut off.</p></blockquote><p></p>
[QUOTE="Jimmysidecarr, post: 15611099, member: 11681"] Good video, don't get discouraged....... but... On the 03s and early 04s with only 4 spark plug threads in the heads, that have blown plugs out of the head, who in the world actually thinks that is was caused by the piston coming up and hitting the plug? That would have to be a very non-gear head, non-car guy type of person. Naive comes to mind. When those few threads fail, it is simply the pressure in the cylinder that blows the plug out. It does not have to be the greater pressure caused by detonation. Additionally the ground strap is typically not hammered closed by the detonation event, it is hammered closed by the on going up and down slamming the plug is subjected to in the plug well of the head as the cylinder alternates between vacuum and compression. The plug is held captive by the coil boot and the coil covers, so it just keeps slamming up and down till the engine is shut off. [/QUOTE]
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Spark plug injection myth
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