Spark Plug Recommendation

Spark Plug Recommendation

Postby pickupjoeb » May 12th, 2019, 1:28 pm

I'm looking for plug recommendations for a 1964 FV Vintage 1200

It has autolite 414 in the engine now and I'm looking to use a Bosh or Ngk plug and looking to see what other people are using.
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Re: Spark Plug Recommendation

Postby hardingfv32 » May 12th, 2019, 1:47 pm

Dyno results indicate that inexpensive Autolites are just as good as the most expensive plugs you can find. Use standard heat range.

Brian
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Re: Spark Plug Recommendation

Postby Dietmar » May 12th, 2019, 7:41 pm

You asked about NGK, so...

NGK B7HS

Prefer the ones assembled in Japan over the Assembled in the USA only because the Japanese version does not need to have the gap adjusted.

Dietmar
www.quixoteracing.com
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Re: Spark Plug Recommendation

Postby sharplikestump » December 5th, 2019, 12:12 am

For what it's worth......AND, while this applied a few decades back, I do not know that it is the same situation today:
While all of the plugs have a 14x1.25mm thread, the American made thread has a different radius on the ROOT diameter, or another way to state it is: the bottom of each thread has more of a "U" shape than a "V" shape. IMO, this caused the plug to have a greater tendency to pick up metal from the cylinder head, which then damaged those threads. Again, very long ago, but I never used them for that reason.
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