plug wire swap??
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Rookie
Joined: Apr 2006
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plug wire swap??
any truth to the idea of putting my plug wire to the extra plug on the same cylinder as the coil will add torque? I've seen the hemi crate motor is set up like that. Anyone doing it with the regular hemi? Does it help the low end torque? Does it hurt anything?
Professional
Joined: Aug 2005
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RE: plug wire swap??
Can't see how it could increase anything. It's the same spark at the same point in the cycle. The long wires from the opposite coil buys redundancy in case one coil malfunctions. Somehow the Dodge engineers really felt this redundancy was important, otherwise, I don't know why they would have designed such a mess of criss-crossing wires and then went to 2 coils per cylinder in 06.
Roger...
Roger...
Champion
Joined: Nov 2005
Posts: 2,875
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From: North Eastern England
RE: plug wire swap??
Apparently it saves on ignition coils.
With a Hemi, we run with 8 coil packs instead of 16 if they would need if they didn't use the criss cross sytem.
Also helps on emisssion controls as well.
Al.
With a Hemi, we run with 8 coil packs instead of 16 if they would need if they didn't use the criss cross sytem.
Also helps on emisssion controls as well.
Al.
Captain
Joined: Jun 2006
Posts: 518
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From: Regina, SK
RE: plug wire swap??
i was told the criss cross wires are what makes the hemi run more efficiently and thats what gives it good gas milage. The second plug burns the extra fuel left over, and if u add the shorty wires both plugs fire at the same time then.
Champion
Joined: Nov 2005
Posts: 2,875
Likes: 1
From: North Eastern England
RE: plug wire swap??
This was taken from this article about Hemi engines.
Link:- http://www.allpar.com/mopar/new-mopar-hemi.html
Why dual spark plugs?Michael E. Gemmel wrote: “Each cylinder has an ignition coil pack over one spark plug, and a regular plug wire connected to the other spark plug. Further, the coil pack also has a plug wire attached to it that extends to the opposite cylinder bank. It appears that each cylinder shares a coil pack with another cylinder. Each of the two plugs on a given cylinder is fired by a separate coil. One plug has a coil directly attached, and the other is fired via an ignition wire connected to a coil located on another cylinder on the opposite bank. The benefits would be one-half the number of coils (8 vs. 16) compared to each plug having its own coil, and of course less weight.”
“Cryptojoe” wrote: “Being the good Motech Graduate I am, I can say that the extra plug fires during the power stroke in order to more full burn the hydrocarbons. While this does add to NOx (oxides of nitrogen) and ozone emissions, it relieves the catalytic converter from becoming overwhelmed with unburned hydrocarbons. Unlike the Japanese systems of the late 1970s and early 1980s, which avoided the use of catalytic converters, the second ignition allows additional power in the down stroke while lowering the need of restrictive catalyst plates in the converter. This increases breathing, and in turn adds to horsepower output as well.
“As you may recall, in the 1980s Japanese manufacturers skirted trade restrictions concerning EPA standards for unburned hydrocarbons by place spark plugs either in the exhaust pipe (which fired with every piston ignition) or in the exhaust manifold (which fired each time their corresponding cylinder fired). Chrysler morphed this idea to include dual fired plugs on each cylinder, which allows the firing to take place closer to top dead center, and then again when the piston is on the back side of the power stroke.”
Al.
Link:- http://www.allpar.com/mopar/new-mopar-hemi.html
Why dual spark plugs?Michael E. Gemmel wrote: “Each cylinder has an ignition coil pack over one spark plug, and a regular plug wire connected to the other spark plug. Further, the coil pack also has a plug wire attached to it that extends to the opposite cylinder bank. It appears that each cylinder shares a coil pack with another cylinder. Each of the two plugs on a given cylinder is fired by a separate coil. One plug has a coil directly attached, and the other is fired via an ignition wire connected to a coil located on another cylinder on the opposite bank. The benefits would be one-half the number of coils (8 vs. 16) compared to each plug having its own coil, and of course less weight.”
“Cryptojoe” wrote: “Being the good Motech Graduate I am, I can say that the extra plug fires during the power stroke in order to more full burn the hydrocarbons. While this does add to NOx (oxides of nitrogen) and ozone emissions, it relieves the catalytic converter from becoming overwhelmed with unburned hydrocarbons. Unlike the Japanese systems of the late 1970s and early 1980s, which avoided the use of catalytic converters, the second ignition allows additional power in the down stroke while lowering the need of restrictive catalyst plates in the converter. This increases breathing, and in turn adds to horsepower output as well.
“As you may recall, in the 1980s Japanese manufacturers skirted trade restrictions concerning EPA standards for unburned hydrocarbons by place spark plugs either in the exhaust pipe (which fired with every piston ignition) or in the exhaust manifold (which fired each time their corresponding cylinder fired). Chrysler morphed this idea to include dual fired plugs on each cylinder, which allows the firing to take place closer to top dead center, and then again when the piston is on the back side of the power stroke.”
Al.
