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Is there a rule of thumb for choosing spark plugs?
#668685
04/13/10 10:23 AM
04/13/10 10:23 AM
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Joined: Jan 2003
Posts: 5,907 Athens, Greece
Pyper70
OP
master
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OP
master
Joined: Jan 2003
Posts: 5,907
Athens, Greece
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I have close to 28 Champion RJ12YC made in the Mid-90s on my shelf and I currently have the 906s. However, I will be switching over to the Edelbrock's very soon here and I am reading threads on the longer plug slapping the piston and blowing apart the plug and causing damage.
I am noticing alot of people running NGK but how do I select the right plug for my engine. I am concerned because its switching into a different beast.
-From 906s to 84cc Eddy's -Staying at 9.5:1 -Staying with Pro-Billet, MSD coil, and 6AL box -Switching out from HP manifolds and going to Shorty Hedmans -Switching from a Single 750 Performer to a Dual Quad (Dual 500s)
Is there a chart or something that someone can point me to? I think i will have to order the plugs and its gonna take a while to get here
Family owned 1969 Charger R/T DualQuad 440/727/GVO/3.55s
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Re: Is there a rule of thumb for choosing spark plugs?
[Re: ireland383]
#668688
04/13/10 04:04 PM
04/13/10 04:04 PM
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Joined: Dec 2007
Posts: 10,542 BROOK PARK, OH
WILD BILL
Senior Member of the Junior Dragster Club
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Senior Member of the Junior Dragster Club
Joined: Dec 2007
Posts: 10,542
BROOK PARK, OH
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IIRC the only time you will run into a hitting problem is with a dommed piston that doesn't have a plug relief notch.
I'm running 12-1 CR with shaved eddy heads and the plugs don't hit
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