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Post by Spin on Jun 26, 2018 4:02:25 GMT -8
I read recently that NASCAR has allowed the Dodge Hemi engine in their series. Unlike Toyota they want the engine shops to do the grunt work (but the current shops are tied in with Chevy or Ford).
Does NASCAR allow two spark plugs per cylinder? That's one of the advantages of the hemi. Would they allow Dodge to run 16 plugs?
I wonder if none of the smaller shops (Triad, Clements, Pro Motor) never put one in testing.
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Post by struns on Jun 26, 2018 18:39:32 GMT -8
Not sure NASCAR is concerned with this...
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Post by Deleted on Jun 27, 2018 13:28:51 GMT -8
Not sure NASCAR is concerned with this... Yeah, all the gas burns until it runs out of oxygen.
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Post by Spin on Jul 1, 2018 6:51:19 GMT -8
There is a performance advantage as well, having two plugs on opposite sides of the cylinder.
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Post by Deleted on Jul 1, 2018 8:52:36 GMT -8
There is a performance advantage as well, having two plugs on opposite sides of the cylinder. I know that, but without additional oxygen in some form, the fire goes out.
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Post by wilmywood8455 on Jul 1, 2018 9:26:19 GMT -8
There is a performance advantage as well, having two plugs on opposite sides of the cylinder. I know that, but without additional oxygen in some form, the fire goes out. The number of spark plugs has no bearing on the ability to fill the cylinder with fuel and air.
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Post by Deleted on Jul 1, 2018 11:51:12 GMT -8
I know that, but without additional oxygen in some form, the fire goes out. The number of spark plugs has no bearing on the ability to fill the cylinder with fuel and air. I didn't say it did!!
All I said was that having 2 plugs per cylinder does not "guarantee complete combustion" as mentioned in Reply #1 (not the OP).
Where the hell is ChemEng when I need him?
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jc
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Post by jc on Jul 2, 2018 4:07:25 GMT -8
Chrysler only uses the 2nd plug for emissions. Nothing to do with performance. The piston has already been blown down.
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Post by Deleted on Feb 18, 2019 20:29:27 GMT -8
Alfa has long used twin plugs. Not only for reliability, but because of their hemispherical combustion Chambers!
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Post by Deleted on Feb 18, 2019 20:45:04 GMT -8
It's to insure full burn of the mixture. Better performance/complete burn! Alfa Romeo has done this for ever'cause they use a Hemispherical head;-)
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Post by Deleted on Feb 18, 2019 20:49:25 GMT -8
The Chrysler "Hemi" is actually a "Cardioid"shape ;-)
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jmjgt
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Post by jmjgt on Feb 22, 2019 18:56:23 GMT -8
Depending on combustion chamber size and shape and plug placement twin plugs could give an advantage at higher RPM,the engine wouldn't need as much timing advance as a single plug head so it should run cooler and be less prone to pre-ignition. I assume NASCAR will keep Dodge's plug placement as close to stock as the other are. If it should any real advantage Chevy will want the LS homoligated.
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Post by chernaudi on Feb 22, 2019 22:38:12 GMT -8
I thought that the R07 was basically a steel block LS.
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jmjgt
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Post by jmjgt on Feb 23, 2019 8:27:22 GMT -8
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Post by Spin on Feb 24, 2019 6:26:14 GMT -8
The Chrysler "Hemi" is actually a "Cardioid"shape ;-)
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