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Sparkplug gap?
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Posted: 10/09/09 04:39 AM
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Hi All,was hoping someone can give me some advice regarding what i should set the gap on a motor I just put in my 76 camaro. The block is a 4 bolt main out of a 79 chevy truck, the cam and crank is street/strip, the heads are world sportman II, hypertech coil/dist, headers, rpm air gap manifold, 750 holley d.p. with a 4 speed and posi- rear end. I'm using the accel shorty plugs which were pre-gapped at .35. Was wondering if that gap is o.k or if I should widen the gap and what difference if any a wider gap would make. Thank you for any info I really appreciate it.
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Posted: 10/09/09 05:15 AM
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i usually gap mine at 35
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Posted: 10/09/09 05:48 AM
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I gap mine at .045
Horsepower sells Engines and torque wins races.
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Posted: 10/09/09 05:56 AM
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well we all are pretty close I gap min at .040
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Dave632
User
| Posts: 111
| Joined: 07/08
Posted: 10/09/09 04:04 PM
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It also depends on your ignition system. When I was running the MSD 7 with thier matching coil they suggested a gap of .080. I imagine the reason they suggest that is for the bigger spark it gives you and the fact that thier system is much more powerful than a stock one. The other factor you must consider when gapping plugs is the RPM range you will be running. When I ran an older stock system and was reving over 7000 I would gap my plugs closer, .030, since at higher RPM the coil has less time to saturate and a shorter gap is easier to jump. Modern ignition systems are much better so if you are running aftermarket ignition I would check with the manufaturer and see what they recommend.
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skyeking
User
| Posts: 54
| Joined: 08/09
Posted: 10/10/09 03:58 PM
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Hi There, What leads are you using? I find that 8.8mm Top Gun and plug settings of 32-35/1000" are long lifers IF you are NOT a full time road Warrior. With this combo I never had a cleaning session with the dizzy cap for over 3 years as a daily driver averaging 1200 miles a month. Skyeking
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Posted: 10/11/09 05:16 AM
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If your compression ratio is under 9.5:1 then .040-.045 will work fine with your set-up.
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mpayne
Administrator
| Posts: 632
| Joined: 10/07
Posted: 10/13/09 03:14 PM
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Thanks for all the info guys.
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Posted: 10/13/09 06:29 PM
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Static or dynamic at 9.5:1?
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Posted: 10/14/09 02:27 AM
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I said I dont use STATIC compression that doesnt mean I dont know what it is. Would you care to explain why you think static is more accurate than dynamic?
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Posted: 10/14/09 05:02 PM
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I don't think that at all. I just never really thought about how misleading the specs can be at times. No ball bustin intended here.
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Posted: 10/14/09 05:10 PM
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No prob. Cam companies are very misleading. Think about the fact that they recommend the same cam regardless of engine size for a specific RPM. A cam that pulls strong to 5500rpm in a 283 will not do the same in a 400. Its all generalized for the masses! lol
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Posted: 10/14/09 05:21 PM
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indeed!
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Posted: 10/14/09 05:27 PM
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Cam companies generalizing things makes my job harder because some people think its a golden rule to follow.
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