Quick question about some thoughts on what head-range plug to run...
remember, 15.2:1 compression...112 octane fuel.
Pro-1 230 heads worked and opened up. 950 4150 style carb
When i ran the car 2yr's ago I was running the NGK racing plug -7's...that's a medium/hot range plug. With that kind of compression, I know you keep a pretty small gap, typically around .020 correct? would any of you change the heat range? I honestly don't remember how they looked 2yr's ago when I ran the car.
If any one needs additional information to help answer this, just post here and I'll hook it up.
thank you,
Scott
NGK Racing Plugs question
Moderator: John_Heard
NGK Racing Plugs question
'70 Nova
434 small block
Best so far of 10.51 @ 131mph with a best so far 60' /1.46
434 small block
Best so far of 10.51 @ 131mph with a best so far 60' /1.46
- John_Heard
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Re: NGK Racing Plugs question
The 7's are a decent plug if you want to drive it around town and still keep them clean. If you think they are a bit hot, you could move to the -8's for a cooler plug for racing.
My 1971 X275 Nova | Facebook
Re: NGK Racing Plugs question
Thanks John for the info...1 more question though...is a cooler plug better for engines that will see above 7000rpm?
Thanks
Thanks
'70 Nova
434 small block
Best so far of 10.51 @ 131mph with a best so far 60' /1.46
434 small block
Best so far of 10.51 @ 131mph with a best so far 60' /1.46
- John_Heard
- Site Admin
- Posts: 5734
- Joined: Thu May 12, 2005 11:20 am
- Location: Resume Speed, Kansas
- Contact:
Re: NGK Racing Plugs question
I'm not too sure that RPM has a lot to do with this, it's more to do with Cylinder temperatures, more power needs a colder plug. But, if you're driving around town with it, cold plugs will foul out very fast idling around.
My 1971 X275 Nova | Facebook
- Moparious Maximus
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- Location: Iowa
Re: NGK Racing Plugs question
I used to use -7's, when it was a carbed gas motor, still used them when I went alky. Now with the blower motor I went to -9's.
'63 Plymouth, Straight axle, Leaf springs, Drum brakes, 31x10.5wx15 Rears 3215lbs
Best time to date 7.99 @ 170 mph
572" Wedge 8-71 @ 28% OD, ALKY, Glide, Dana
http://www.youtube.com/watch?v=vq-xzFWHtFk
http://www.youtube.com/watch?v=JfyZSw59R_o
Best time to date 7.99 @ 170 mph
572" Wedge 8-71 @ 28% OD, ALKY, Glide, Dana
http://www.youtube.com/watch?v=vq-xzFWHtFk
http://www.youtube.com/watch?v=JfyZSw59R_o
- jmarkaudio
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- Location: Florida
Re: NGK Racing Plugs question
8's will be fine if the idle and transition circuits are tuned to the lean side, this will keep the plugs clean enough. We run 7's up to about 14.5 to 1, my 15.5 to 1 SB2 uses 8's.
Mark Whitener
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Good work isn't cheap and cheap work can't be good.
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