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06-08-2021, 10:59 AM | #21 |
Senior Member
Join Date: Jan 2011
Location: Central Ohio
Posts: 5,062
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Re: spark plug recommendation
You'll find that with most of today's gas, that plugs don't "color like they used too". It is difficult to achieve a nice chocolate brown color . . . just never seems to happen for me. I tend to see colors that are a much lighter brownish/grey when the mixture is right.
As RoTo mentioned, you should do a test on the highway . . . is the only real way to do it. If you drive around, then come to stops and idle the engine . . . you'll find they almost always look too rich. So, you can't check the plugs after you go home - you'll not have accurate coloring . . . Or, put some O2 sensor bungs in your exhaust and use a meter to tell you what is really happening. |
06-08-2021, 05:55 PM | #22 |
Senior Member
Join Date: Dec 2015
Posts: 547
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Re: spark plug recommendation
I had a similar issue at cruise speed, good advice on the plugs. In my case, the driveshaft was severely out of balance. Had a driveline shop balance it and all good.
JB |
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06-09-2021, 11:14 AM | #23 |
Senior Member
Join Date: Jul 2020
Location: iowa
Posts: 133
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Re: spark plug recommendation
anyone using autolite 386s? seem to work fine in my orig 37 flathead.
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06-11-2021, 10:37 PM | #24 |
Senior Member
Join Date: Nov 2011
Location: Ivyland, PA
Posts: 116
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Re: spark plug recommendation
Ronnie, I’m curious why you recommend a larger plug gap for 12 volts. Is the secondary voltage of a 12 volt system higher than a 6 volt system?
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