why two

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11-09-2007 | 12:43 PM

edbobx

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why two

i was just wondering why the new hemis have two spark plugs per cylinder. i wasn't sure if it was a form of waste spark or what. any feed back would be appreciated

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01-28-2008 | 09:42 PM

CAT-TECH

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better combustion. More spark means more fuel can be burned, better emissions, and best of all better mpg

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01-29-2008 | 05:41 PM

Commando

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From: New Jersey

I also drive a Ford Ranger, its a 4 cylinder and has 2 plugs per cylinder so it is not just Hemis. I was told that the plugs fire at different times so that all the fuel is burned. It gets about 25 mpg, and can accelerate just as well as a 6 cylinder, but comes no where close to my Mopar.

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01-29-2008 | 06:22 PM

CAT-TECH

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One plug probably fires just after TDC compression and then again after 20-30 degrees of rotation. This is a complete guess on my part but sounds like it makes sense. If someone knows when the plugs really fire that would be much appreciated.

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