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spark plug gap
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http://www.clubcobra.com/forums/all-cobra-talk/114338-spark-plug-gap.html)
| Goopie 18 |
02-12-2012 07:57 AM |
spark plug gap
Roush 427R 10.25 cr. MSD 6AL control, MSD master blaster coil. New MSD cap/rotor. MSD suggests 0.050-0.060 for this compression ratio. Roush suggests middle 0.03's. Suggestions?
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| Dwight |
02-12-2012 08:02 AM |
I'm interested in the answer to this question.
Dwight
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| Rwillia4 |
02-12-2012 09:55 AM |
+1 to an answer with reason.
and what heat range plug
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| mreid |
02-12-2012 10:32 AM |
When you are really trying to wringe every last HP out of an engine, spark plug indexing and gap tuning become important. However, you have to identify your ideal operating RPM and tune for that range. Frankly, for the variety of driving you are apt to do with your car, I would go with .045.
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| Got the Bug |
02-12-2012 10:39 AM |
I've got a 402 Roush with basically the same set-up. A gap of .040 - .045 was recommended to me for a good idle and power.
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| RET_COP |
02-12-2012 07:02 PM |
Why big gaps. They don't offer a whole lot and increase the chance for a misfire especially if the system is not up to firing across resistance. .035 to .040 will work, always has for me.
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| mreid |
02-12-2012 09:58 PM |
Well, because too small a gap on a higher compression ratio with a high energy ignition (we're not talking your old car points and coil with current resistor set up) will shorten plug life significantly. And I do mean significantly as the plug consumes itself, particularly with a multispark, high energy box on an engine that spends most of its time below 3000 rpm (point above where msd box reverts to one spark per plug per cycle). Conversely, too large a gap will cause misfires, particularly at higher rpms where the charge cycle is shorter causing less energy from the coil.
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