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Re: Why the 10mm spark plugs?
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Home away from home
 
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All flat head engines i've ever seen always have plug closer to EXHAUST valve. If placed directly over INtake then the hot plug could ignite incoming fuel.
And yes, i've had on a few occasions over the years removed the plug to tap down and snake oil the exhaust valve just to get the car or bike home. Most likely the 10mm plug was an attempt to CUT COST of mfg'ing the plug. One of the problems arises is when the THREAD length increases mush past the diamenter of the thread. Tooling breakage, threaded portion wanting to snap off due to length etc. Has anyone EVER seen a 3/4" threaded 10 mm plug???? I haven't. Most likely it was just an attempt to cost cut for the mfg'ers.
Posted on: 2017/1/11 20:28
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VAPOR LOCK demystified: See paragraph SEVEN of PMCC documentaion as listed in post #11 of the following thread:f
https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=7245 |
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Re: Why the 10mm spark plugs?
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Home away from home
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Late model cars have very long 10mm plugs.
Posted on: 2017/1/11 20:51
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