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Spark Plug Choice HEMI pump gas alum heads RC9YC #585341
01/17/10 01:33 PM 01/17/10 01:33 PM
Joined: Jan 2003
Posts: 9,670
Lima, Peru
domingo Offline OP
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Is the Champion RC9YC a good choice for the following engine?

528 HEMI
10,5:1 CR
ALUM HEADS
SOLID ROLLER CAM 250º @ 0,050" UNDER ,600 LIFT
PUMP GAS
Re: Spark Plug Choice HEMI pump gas alum heads RC9YC [Re: domingo] #585342
01/17/10 02:10 PM 01/17/10 02:10 PM
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Bend,OR USA
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I have used both the RC12YC and RC9YC on my edddy RPM aluminum headed 518 wedge with 10.29 to 1 comp and my 464 Eddy headed 10.46 to 1 comp. ratio little motor Both work well on the street and at the track with those plugs, BTW I am at 3000 FT above sea level also

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Spark Plug Choice HEMI pump gas alum heads RC9YC [Re: Cab_Burge] #585343
01/17/10 02:11 PM 01/17/10 02:11 PM
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Temperance, MI
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prochargedhemi Offline
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I only run autolites, AR52
Re: Spark Plug Choice HEMI pump gas alum heads RC9YC [Re: prochargedhemi] #585344
01/17/10 08:33 PM 01/17/10 08:33 PM
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Bend,OR USA
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The AR52 are pretty cold for a street car on pump gas If I was going to use the 13/16 size spark plug bodys I would probally use the Autolite 53 or 54, or the resistor plugs in the same heat range( I can't remember those numbers right now )

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Spark Plug Choice HEMI pump gas alum heads RC9YC [Re: Cab_Burge] #585345
01/19/10 04:56 PM 01/19/10 04:56 PM
Joined: Mar 2003
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pa
572charger Offline
top fuel
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autolites 65 on the street and 63 at the track !

606 hemi pump gas best 9.60 at 142mph on motor
05 hemi daytona 1500 go-mango 4wd quadcab
2007 hotrod mag pump gas drags runner up, roadkill nights dodge big tire winner 2018 2019 back to back
Re: Spark Plug Choice HEMI pump gas alum heads RC9YC [Re: Cab_Burge] #585346
01/19/10 05:01 PM 01/19/10 05:01 PM
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Temperance, MI
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prochargedhemi Offline
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Quote:

The AR52 are pretty cold for a street car on pump gas If I was going to use the 13/16 size spark plug bodys I would probally use the Autolite 53 or 54, or the resistor plugs in the same heat range( I can't remember those numbers right now )



I just cross referenced the accells that barton had put in it and that was the autolite number. I run c12 at all times so not really sure
Re: Spark Plug Choice HEMI pump gas alum heads RC9YC [Re: domingo] #585347
01/19/10 05:14 PM 01/19/10 05:14 PM
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Oregon
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The RC9YC plug should work fine for your application.
Re: Spark Plug Choice HEMI pump gas alum heads RC9YC [Re: AndyF] #585348
01/20/10 10:07 PM 01/20/10 10:07 PM
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Lower AZ
AZ-Nick Offline
Here Since 1996!
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Lower AZ
thx for the info....

71 GTX 4sp Dana GY9 HD Road King
Re: Spark Plug Choice HEMI pump gas alum heads RC9YC [Re: prochargedhemi] #585349
01/21/10 03:19 AM 01/21/10 03:19 AM
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HEMI472 Offline
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I just cross referenced the accells that barton had put in it and that was the autolite number. I run c12 at all times so not really sure




what was the accells number??????????
Re: Spark Plug Choice HEMI pump gas alum heads RC9YC [Re: AndyF] #585350
01/21/10 09:59 AM 01/21/10 09:59 AM
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Lima, Peru
domingo Offline OP
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Thanks for the info guys!
Re: Spark Plug Choice HEMI pump gas alum heads RC9YC [Re: domingo] #585351
11/15/12 01:09 PM 11/15/12 01:09 PM
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Posts: 9,670
Lima, Peru
domingo Offline OP
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what about champion C-63YC

would it be a better choice?
Re: Spark Plug Choice HEMI pump gas alum heads RC9YC [Re: domingo] #585352
11/15/12 04:12 PM 11/15/12 04:12 PM
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Bend,OR USA
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Quote:

what about champion C-63YC

would it be a better choice?

Definetly NOT There way to cold for a low compression pump gas motor unless you run it really lean at idle and part throttle, I wouldn't. Champion uses a numbering system that the smaller the numbers the colder the plug is The C63YC is a 5/8 body plug with a protruded gap and a copper center electrode that is a little hotter than a RN6YC or N6YC would be

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Spark Plug Choice HEMI pump gas alum heads RC9YC [Re: Cab_Burge] #585353
11/15/12 04:25 PM 11/15/12 04:25 PM
Joined: Jan 2003
Posts: 9,670
Lima, Peru
domingo Offline OP
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These are the plugs I have:

champion RC9YC: I think heat range is 5??? for 10,5:1 with alum heads
Champion RN12YC: Heat range 4??? for under 9:1 with alum heads???
Champion C61YC: heat Range 9??? for 12:1 with alum heads
NGK 7173: heat range 8??? for 11:1 with alum heads???

Are my above statemets true?

Should I try the RC9YC first and go from there?
Re: Spark Plug Choice HEMI pump gas alum heads RC9YC [Re: domingo] #585354
11/15/12 06:43 PM 11/15/12 06:43 PM
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Bend,OR USA
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I would try the RC9YC first and then the RN12YC after getting the tune up the way you want it and determine which plugs you like the best

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Spark Plug Choice HEMI pump gas alum heads RC9YC [Re: Cab_Burge] #585355
11/15/12 07:32 PM 11/15/12 07:32 PM
Joined: Jan 2003
Posts: 9,670
Lima, Peru
domingo Offline OP
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domingo  Offline OP
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Lima, Peru
will do!!! thanks!!!
Re: Spark Plug Choice HEMI pump gas alum heads RC9YC [Re: domingo] #585356
11/15/12 09:46 PM 11/15/12 09:46 PM
Joined: Jan 2003
Posts: 9,670
Lima, Peru
domingo Offline OP
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domingo  Offline OP
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Any suggestions on where to gap the plugs at? Im gonna be running an MSD 7AL
Re: Spark Plug Choice HEMI pump gas alum heads RC9YC [Re: domingo] #585357
11/15/12 11:14 PM 11/15/12 11:14 PM
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Bend,OR USA
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Quote:

Any suggestions on where to gap the plugs at? Im gonna be running an MSD 7AL

I like and use between .045 and .060

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

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