Hot vs Cold plugs
Thread Starter
Pro
Joined: Sep 2004
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From: Boston MA
Hot vs Cold plugs
Does anyone the difference between hot and cold plugs? How do you determine the heat range for your engine? I have 1968 327 bored 30 over with Edelbrock performer RPM heads 60cc, electronic ignition, what is a good spark plug for my car??
Thanks
Thanks
Thread Starter
Pro
Joined: Sep 2004
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From: Boston MA
Thanks for the responses!!!
What are the differences between R45 and standard. What does the S stand for in R45S? And which manufacturer should I pick? Delco? will these work with electronic ignition? what about the heat from the high compression heads? what is the heat range on an R45 plug? What about gap size??
Thanks,
Joe
What are the differences between R45 and standard. What does the S stand for in R45S? And which manufacturer should I pick? Delco? will these work with electronic ignition? what about the heat from the high compression heads? what is the heat range on an R45 plug? What about gap size??
Thanks,
Joe
Last edited by 68coupe; Sep 28, 2004 at 01:36 PM.
Race Director
Joined: Nov 2002
Posts: 12,142
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From: Taylor Michigan
I dont know exactly what a standard plug is. He may be refering to a plug with out a "R". However, R means resistor, which nearly all plugs are now classified as being. The "S" means extended tip that will protrude in to the combusion chamber sometime hitting the top of the piston on higher compression engines. The munbers refer to heat range, the lower # the colder the plug. 42,43,44, 45 ect. cold to hot. Street driven engines will react and stay cleaner with a 45 heat range. Use the R45 and gap it at .035 for point style ignition systems. 
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Pro
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From: Boston MA
couple more questions
Taylor,
Thanks, for the great advice, ut I have a question for you. I think my comp. ratio is 11:1, should I stil use the R45? Also, in your response you said to use a .035 gap for points, but I have MSD ignition. Should I still use this gap or a different one. If a different one, what gap?What about manufacurer? AC Delco?
Thanks,
Joe
Thanks, for the great advice, ut I have a question for you. I think my comp. ratio is 11:1, should I stil use the R45? Also, in your response you said to use a .035 gap for points, but I have MSD ignition. Should I still use this gap or a different one. If a different one, what gap?What about manufacurer? AC Delco?
Thanks,
Joe
Race Director
Joined: Nov 2002
Posts: 12,142
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From: Taylor Michigan
Originally Posted by 68coupe
Taylor,
Thanks, for the great advice, ut I have a question for you. I think my comp. ratio is 11:1, should I stil use the R45? Also, in your response you said to use a .035 gap for points, but I have MSD ignition. Should I still use this gap or a different one. If a different one, what gap?What about manufacurer? AC Delco?
Thanks,
Joe
Thanks, for the great advice, ut I have a question for you. I think my comp. ratio is 11:1, should I stil use the R45? Also, in your response you said to use a .035 gap for points, but I have MSD ignition. Should I still use this gap or a different one. If a different one, what gap?What about manufacurer? AC Delco?
Thanks,
Joe
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Melting Slicks
Joined: Dec 2000
Posts: 2,041
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From: Wichita, KS
The plugs that I use are the same one's that I mentioned above, the Champion RC12YC. Any good auto supply house should be able to cross referance that number to whatever brand that they sell. If they cross referance just the RC12 you will get a standard plug. The Y means that the plug has a projected tip and the C is for a compact, or shorter, plug. If you have headers you will want a short plug length most likely and you really want a projected tip. The Edelbrock heads use a gasketed spark plug.
Safety Car
Joined: Feb 1999
Posts: 3,631
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From: Fountain Hills AZ
Originally Posted by 1979toy
Edelbrock recommends the Champion RC12YC plug for their cylinder heads.
Don't forget to use anti-seize!
Don't forget to use anti-seize!
Edelbrock heads use a 3/4" reach plug (like the RC12YC), not the shorter plugs that stock heads use.
Thread Starter
Pro
Joined: Sep 2004
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From: Boston MA
crosss reference
I went to Autozone and they cross referenced the plug with an AC Delco and it came out to 41-602.
DO you think this is correct???
Is the heat range 41??
Does a hotter range plug burn hotter and vice versa?
Please help!!
Joe
DO you think this is correct???
Is the heat range 41??
Does a hotter range plug burn hotter and vice versa?
Please help!!
Joe
Team Owner
Joined: Jul 1999
Posts: 26,545
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From: Huntersville NC
Melting Slicks
Joined: Dec 2000
Posts: 2,041
Likes: 0
From: Wichita, KS
Looking at the link kindly provided by PRND21 I would have to say that the spark plug that they are trying to sell you is NOT the direct replacement for the Champion RC12YC. It may be the same general heat range as the Champion plug but does not have the projected tip nor the shorter overall length.
Thread Starter
Pro
Joined: Sep 2004
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From: Boston MA
I returned the delco plugs and got the champion RC12yc instead.
Any suggestions before I install them?
Should I use anti seize?
Gap them .040??
Anything else I need to know??
Thanks for all of your great posts!
Joe
Any suggestions before I install them?
Should I use anti seize?
Gap them .040??
Anything else I need to know??
Thanks for all of your great posts!
Joe
Melting Slicks
Joined: Dec 2000
Posts: 2,041
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From: Wichita, KS
USE ANTI-SEIZE!!! ALWAYS USE ANTI-SEIZE!!! ON EVERY BOLT GOING IN TO THE ALUMINUM HEADS!!!
Should you ever forget the above warning, just one time, you risk destroying the threads in whatever hole that you failed to put anti-seize on the fastner.
I have an MSD ignition and gap my plugs at .035. You should be fine with that gap no matter what ignition you are using.
Should you ever forget the above warning, just one time, you risk destroying the threads in whatever hole that you failed to put anti-seize on the fastner.
I have an MSD ignition and gap my plugs at .035. You should be fine with that gap no matter what ignition you are using.
