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  What spark plugs are cleveland racers using with 10.5 to 11:1 compression?

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Author Topic:   What spark plugs are cleveland racers using with 10.5 to 11:1 compression?
70coupe
Gearhead

Posts: 277
From: Toronto,Ontario,Canada
Registered: Aug 2000

posted 10-22-2001 03:59 PM     Click Here to See the Profile for 70coupe     Edit/Delete Message   Reply w/Quote
Just wondering what plugs you guys are using with a 351c with closed chamber heads and flat top pistons? I have tried NGK R5674-7 and Motorcraft 42's. The Motorcrafts seem to burn a little hotter as they look alot cleaner when removed.

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kid vishus
Gearhead

Posts: 3894
From: middle of NC
Registered: Oct 2000

posted 10-22-2001 04:02 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
I run NGK -6's with that kind of compression on gas. The -7's are too cold. I run those when it is on alchohol.

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Hans olsson
Gearhead

Posts: 249
From: Sweden
Registered: Apr 2000

posted 10-23-2001 05:03 AM     Click Here to See the Profile for Hans olsson   Click Here to Email Hans olsson     Edit/Delete Message   Reply w/Quote
We use ACDelco CR42TS . Next time on the dyno we will try some Champions. More later.

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  • 71 Mach1 351c
  • E/SA 11.89-110
  • F/SA 11.92-110

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Moneymaker
Administrator

Posts: 18704
From: Lyons, IL, USA
Registered: May 99

posted 10-24-2001 11:52 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
AF-22 or ASF-22 Motorcrafts. The power tip will keep them clean and the heat range is better suited for your compression and high RPM use.

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Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

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SteveLaRiviere
Administrator

Posts: 31026
From: Saco, Maine
Registered: May 99

posted 10-24-2001 05:54 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Hans olsson:
We use ACDelco CR42TS . Next time on the dyno we will try some Champions. More later.

AHHHHHHHH!!!!!!!

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'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L DOHC

Proud to be an Infidel!

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70coupe
Gearhead

Posts: 277
From: Toronto,Ontario,Canada
Registered: Aug 2000

posted 10-25-2001 12:00 AM     Click Here to See the Profile for 70coupe     Edit/Delete Message   Reply w/Quote
Question about motorcraft plugs. What is the difference in an ASF42C and an ASF52C? Is the first number the heat range on the motorcraft plugs? I know most are the last. Well NGK and Autolite. I dont dare use the other names!!

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Moneymaker
Administrator

Posts: 18704
From: Lyons, IL, USA
Registered: May 99

posted 10-25-2001 01:01 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
The first number is the heat range. A 52 is one step hotter than a 42. The second number is the tip. A 2 denotes a power tip extension that is self cleaning. PS, Hans....REAL FRIENDS DON'T LET FRIENDS USE GM PARTS IN THEIR FORDS!

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Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

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