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Re: Spark Plugs
I gap mine at .040 with a stock TB IV ignition.
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Re: Spark Plugs
Originally Posted by Griff
I run NGK UR5's in my 525SC with a hotter cam and 7.5# of boost. They are the same heat range as the AC MR41T. Never had them foul out, but after a long idle in humid weather they are pretty dark.
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Re: Spark Plugs
Originally Posted by Panther
Aren't the UR5's an extended tip plug? I think I bought them once but I didn't use them because I thought it would put the plug too close to the piston.
Yes, they have a slightly extended tip. About the same as the AC R41TS. The tip sticks out about an 1/8 inch. |
Re: Spark Plugs
I believe the S used to stand for stainless for the marine applications. I would start off with the factory gap setting 1 heat range colder if you are looking to err on the safe side. If it runs & burns well leave it alone. If it is a bit to rich widen the gap a little for a hotter spark and or also go 1 plug hotter.. This is all assuming your fuel pressures are correct.. :) jamie / Lakeside
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Re: Spark Plugs
The S is the designation for the extended tip. The M signifies marine.
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Re: Spark Plugs
Sorry, My bad.. I usually use the NGK's.. You would be correct that is why the auto versions usually star as R4### :) Jamie
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Re: Spark Plugs
Been looking for the NGK-UR5's but have been unable to find a supplier. Where can I purchase these plugs?
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Re: Spark Plugs
Originally Posted by chewy1955
Been looking for the NGK-UR5's but have been unable to find a supplier. Where can I purchase these plugs?
Thanks |
Re: Spark Plugs
Thanks Panther, I'll check it out.
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Re: Spark Plugs
Panther is right..
If they can not get them for you give me a shout. I can probably get a set for you if you dont mind the shipping.. :) Jamie / Lakeside |
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