Has anone ran these plugs? Good with MSD ignition coil cap rotor & wires?

 

I've used them with my Jacobs Ultra team ignition with no problems. Decided to stay with plain ol' Ac Delco plugs cuz them Rapid Fires expensive!


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92' Camaro RS 305 TBI
Best 1/4 mile - 14.6 @ 96 mph w/NO NOS
Best 60' - 1.9 secs
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I was just talking to a friend about this.
MSD does not make more power if you have the SAME gap on the spark plugs. The advantage of an cap discharge system is that you can run a larger gap and THAT is what makes for a better idle and more complete combustion = better power.
A spark plug is a spark plug, it's the gap and temp that make the difference so I say go with regular spark plugs, you won't notice a difference and they'll save you $$.

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, Jon (350 TBI!)
91 Red My website

 

i have the rapid fires. changed fuel filter, cap and rotor. car ran TONS smoother. just the plugs, not big deal, but i would say they are good, but expensive.

 

i am using rapidfires and I like em.

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Eric Natzke
91 Firebird 305 TBI
"It Ain't Stock"
http://members.aol.com/j007golden/91firebird.html
For info on certain parts or mods go to the site below
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"The Rapidfire is pre-gapped at .045 and should not be regapped, and therefore not used, with breaker/points-style ignitions."
~http://www.hotboat.net/samplearticle/ENGINETUNINGFORMAXIMUMPERFORMANCE_dir/ENGINETUNINGFORMAXIMUMPERFORMANCE_s6.htm

Understand that it isn't really the plug, it's the gap. Most racers use standard plugs if you don't believe me, go to the local drag strip and ask around. They just regap the plugs to say .05 if they're running a higher voltage. High voltage = spark will jump a further gap, this is a good thing for power.

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, Jon (350 TBI!)
91 Red My website

 

An old school trick is to run as much gap as possible as long as it doesn't start to miss. If it starts to miss you'll feel it when the ecm is in closed loop. You'll probably even feel it stumble. This is when a higher voltage coil is needed (higher compression ratios) and in turn you'll need a better wire 8mm and larger to make sure you don't get any arc near the distrib.
I hope this makes sence so most of you don't go wasting money. When you start making some serious power and a loppy cam you'll be glad you have a good ignition system but for now it won't really help. Heck, I'm running a stock HEI setup with stock coil and 8mm wires....no arc and great power. I could probably make a little more down low if I get a higher voltage coil and increase my gap. This is a MAYBE, not a definatly.

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, Jon (350 TBI!)
91 Red My website

 

Just found this out, the new Rapidfires are now platinum and not pre gapped anyone running these yet?

 

They are to expensive. Spark plug is a spark plug like PREVOST said it only mattrers if you can open the gap up any.

 

I'm running with MSD coil,cap & rotor + MSD Red ignition wires. What gap should I be running, stock or + ?

 

I have the same exact ignition setup as u Cody and I just left it at .045 and it runs real well. No compliants here.

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Eric Natzke
91 Firebird 305 TBI
"It Ain't Stock"
http://members.aol.com/j007golden/91firebird.html
For info on certain parts or mods go to the site below
http://members.aol.com/j007golden/modeval.html

 

If you have a higher voltage coil then you can probably get away with the .045 gap.
In fact if you are running good with it then I'd say that's a good setup. The more gap the better. Understand that if you go with a higher compression engine and more advanced heads (more turbulance etc.) you'll probably have to either go with a cap discharge setup or reduce the gap on the plug.

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, Jon (350 TBI!)
91 Red My website

 

I have the new Rapidfire Platinum plugs they need gapping, what do you guys think?

 

so as far as this is concerned, the farther the spark jumps across the plug, then better the combustion process? forgive me, but why? is it because it ignites more of the air/fuel mixture than stock set-up? just asking...I dont want to assume it now, then look stupid later...I would rather look stupid now with just yall around thanks

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