How does spark plug gap effect temperatur of the plug? AFR Heads
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Joined: Jul 2001
Posts: 310
From: California
How does spark plug gap effect temperatur of the plug? AFR Heads
I was looking for a set of plugs to break in me new motor. The AFR heads said to start with a AC FR3LS plug or an NGK plug(not the common TR5 or TR55's). I went to Auto zone and the guy looked some plugs up in the book and crossed referenced the heat and gap but didn't have what AFR suggested. AC Delco has been changing part numbers like crazy the last few months and the number is no longer used.
ANYHOW. The guy at auto zone said that a plug that was 2 heat zones cooler would than stock would run fine in my car because of the ignition system. He said the Acell 300+ would burn up the stock plugs faster than the lower heat cycle. He also recomended me to gap the closer to .35 instead of the .50 that his computer said the stock gap was for a stock car.
So now Im wondering if I should put the plugs in and run the or just change them out when I'm done with the break in of the motor.
I'm looking for some solid information on this and not a bunch of replys with "I run NGK/AC."
So what is the deal with these spark plugs? Anyone with AFR LT4 210 Comp ported heads please feel free to list what your experiance have been with your plugs. Thanksn
ANYHOW. The guy at auto zone said that a plug that was 2 heat zones cooler would than stock would run fine in my car because of the ignition system. He said the Acell 300+ would burn up the stock plugs faster than the lower heat cycle. He also recomended me to gap the closer to .35 instead of the .50 that his computer said the stock gap was for a stock car.
So now Im wondering if I should put the plugs in and run the or just change them out when I'm done with the break in of the motor.
I'm looking for some solid information on this and not a bunch of replys with "I run NGK/AC."
So what is the deal with these spark plugs? Anyone with AFR LT4 210 Comp ported heads please feel free to list what your experiance have been with your plugs. Thanksn
Registered User
Joined: Jul 2000
Posts: 94
From: Gardena, CA, USA
Here is what the AFR web site says. The only thing I found different from other sources is that FR3LS is equivelent to RC12YC instead of RC9YC.
(14mm x 3/4" gasket) no tapered seat style! For race applications Champion C59YC, Autolite 3910 or 51, A/C R41CXLS & NGK R41 CXLS are good starting points. For street applications use AC FR3LS or RC9YC Spark Plugs or equivalent. Spark Plug selection is of course dictated by many factors including RPM level, compression ratio and type of fuel. All the above Spark Plugs are at a starting heat range; blowers or nitrous applications usually require 1 to 2 heat ranges colder. Spark Plug gap should be determined by the ignition manufacturer.
(14mm x 3/4" gasket) no tapered seat style! For race applications Champion C59YC, Autolite 3910 or 51, A/C R41CXLS & NGK R41 CXLS are good starting points. For street applications use AC FR3LS or RC9YC Spark Plugs or equivalent. Spark Plug selection is of course dictated by many factors including RPM level, compression ratio and type of fuel. All the above Spark Plugs are at a starting heat range; blowers or nitrous applications usually require 1 to 2 heat ranges colder. Spark Plug gap should be determined by the ignition manufacturer.
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