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What spark plug heat range? #1621275 05/17/14 07:48 PM 05/17/14 07:48 PM
Joined: Nov 2003 Posts: 10,384 Upstate NY Bigcube OP I Live Here
Bigcube OP I Live Here Joined: Nov 2003 Posts: 10,384 Upstate NY	I used a NGK -9 heat range for 15:1 compression. Should I change to a -8 for 11:1 and 93 octane? Jim

Re: What spark plug heat range? [Re: Bigcube] #1621276 05/17/14 07:50 PM 05/17/14 07:50 PM
Joined: Sep 2004 Posts: 1,499 San Antonio,TX 4 440W8 Duster pro stock
440W8 Duster pro stock 4 Joined: Sep 2004 Posts: 1,499 San Antonio,TX	I would try a -7 first! 70 Duster W8 motor. 1.29 60ft 5.79 1/8 at 120 mph glide with 1.80 gear @3170 lbs.

Re: What spark plug heat range? [Re: 440W8 Duster] #1621277 05/17/14 07:58 PM 05/17/14 07:58 PM
Joined: Sep 2003 Posts: 2,008 Sweet Home Alabama M MRMOPAR622 top fuel
MRMOPAR622 top fuel M Joined: Sep 2003 Posts: 2,008 Sweet Home Alabama	The Champion C57CX is Perfect...I'm sure if you cross that number over to the NGK you would have the Prefect Heat Range.And at 15.1 CR gap the plugs .022-.025 that will make a Big Improvement. PS Sorry I mis-read you post that plug is for a 15-1 CR and I have never run a 11-1 CR on 93 octane before.Again Sorry for the mistake. Last edited by MRMOPAR622; 05/17/14 08:03 PM. "To Be The Man'You Have Got To Beat The Man" "T/D and Pro-Bracket Racer"

Re: What spark plug heat range? [Re: MRMOPAR622] #1621278 05/17/14 11:55 PM 05/17/14 11:55 PM
Joined: Sep 2004 Posts: 6,906 IL, Aurora A ademon master
ademon master A Joined: Sep 2004 Posts: 6,906 IL, Aurora	I use 9 NGK in my 11.25 cr, SB that has about 205 cranking psi. I run 93 don't here any knock or pinging I think I'm a little rich at idle with a 4 corner idle carb it's mostly a street car. Plugs look a little dark after 3 or 4k but what the h*ll the pistons are still in it!!

Re: What spark plug heat range? [Re: 440W8 Duster] #1621279 05/17/14 11:58 PM 05/17/14 11:58 PM
Joined: Jun 2007 Posts: 2,646 Plymouth Meeting, PA bigtimeauto Trophy Winner
bigtimeauto Trophy Winner Joined: Jun 2007 Posts: 2,646 Plymouth Meeting, PA	Quote: I would try a -7 first! this or a 8 BB, TT5,Procharged 3300lb Street Car 4.79/154

Re: What spark plug heat range? [Re: Bigcube] #1621280 05/18/14 03:34 AM 05/18/14 03:34 AM
Joined: Aug 2010 Posts: 167 mi D dirty magnum member
dirty magnum member D Joined: Aug 2010 Posts: 167 mi	Quote: I used a NGK -9 heat range for 15:1 compression. Should I change to a -8 for 11:1 and 93 octane? [/quote i use 7s for 15:1 i use 7s for 15:1

Re: What spark plug heat range? [Re: dirty magnum] #1621281 05/18/14 04:04 AM 05/18/14 04:04 AM
Joined: Sep 2004 Posts: 6,906 IL, Aurora A ademon master
ademon master A Joined: Sep 2004 Posts: 6,906 IL, Aurora	Mancini had a good NGK heat range to CR chart but I can't find it on there site maybe someone has it.

Re: What spark plug heat range? [Re: ademon] #1621282 05/18/14 09:00 AM 05/18/14 09:00 AM
Joined: Nov 2009 Posts: 2,177 ill D dennismopar73 top fuel
dennismopar73 top fuel D Joined: Nov 2009 Posts: 2,177 ill	Why change heat range ? Fix issues x motor to fat. Repair carb or fuel.delivery Getting oil contaminant in combustion chamber , fix it Heat range is only the temp that the plug disperse to keepit firing. Not actual cyl.temp Not all plugs heat rang alike NGK http://www.ngksparkplugs.com/tech_support/spark_plugs/p2.asp?mode=nml Last edited by dennismopar73; 05/18/14 09:05 AM.

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