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Spark Plug Choice HEMI pump gas alum heads RC9YC

Posted By: domingo

Spark Plug Choice HEMI pump gas alum heads RC9YC - 01/17/10 05:33 PM

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
Posted By: Cab_Burge

Re: Spark Plug Choice HEMI pump gas alum heads RC9YC - 01/17/10 06:10 PM

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
Posted By: prochargedhemi

Re: Spark Plug Choice HEMI pump gas alum heads RC9YC - 01/17/10 06:11 PM

I only run autolites, AR52
Posted By: Cab_Burge

Re: Spark Plug Choice HEMI pump gas alum heads RC9YC - 01/18/10 12:33 AM

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 )
Posted By: 572charger

Re: Spark Plug Choice HEMI pump gas alum heads RC9YC - 01/19/10 08:56 PM

autolites 65 on the street and 63 at the track !
Posted By: prochargedhemi

Re: Spark Plug Choice HEMI pump gas alum heads RC9YC - 01/19/10 09:01 PM

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
Posted By: AndyF

Re: Spark Plug Choice HEMI pump gas alum heads RC9YC - 01/19/10 09:14 PM

The RC9YC plug should work fine for your application.
Posted By: AZ-Nick

Re: Spark Plug Choice HEMI pump gas alum heads RC9YC - 01/21/10 02:07 AM

thx for the info....
Posted By: HEMI472

Re: Spark Plug Choice HEMI pump gas alum heads RC9YC - 01/21/10 07:19 AM



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??????????
Posted By: domingo

Re: Spark Plug Choice HEMI pump gas alum heads RC9YC - 01/21/10 01:59 PM

Thanks for the info guys!
Posted By: domingo

Re: Spark Plug Choice HEMI pump gas alum heads RC9YC - 11/15/12 05:09 PM

what about champion C-63YC

would it be a better choice?
Posted By: Cab_Burge

Re: Spark Plug Choice HEMI pump gas alum heads RC9YC - 11/15/12 08:12 PM

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
Posted By: domingo

Re: Spark Plug Choice HEMI pump gas alum heads RC9YC - 11/15/12 08:25 PM

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?
Posted By: Cab_Burge

Re: Spark Plug Choice HEMI pump gas alum heads RC9YC - 11/15/12 10:43 PM

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
Posted By: domingo

Re: Spark Plug Choice HEMI pump gas alum heads RC9YC - 11/15/12 11:32 PM

will do!!! thanks!!!
Posted By: domingo

Re: Spark Plug Choice HEMI pump gas alum heads RC9YC - 11/16/12 01:46 AM

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

Re: Spark Plug Choice HEMI pump gas alum heads RC9YC - 11/16/12 03:14 AM

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
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