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  #61  
Old 06-24-2013, 12:48 PM
huntergreen huntergreen is offline
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do the police plugs affect the warranty at all?
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  #62  
Old 07-10-2013, 06:10 PM
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Hello all,

A bit of an update on my aforementioned 16ea - MOPAR Iridium Spark Plugs, S&B Cold Air Intake (CAI) and a Diablosport I1000-DCX INtune...

All-in-All - FANTASTIC!!

I ask for and quickly received a custom tune from Diablotoona that really made it all come together. The drive-ability and responsiveness (as in throttle response) is greatly improved, seems to have a considerable improvement in power (no I didn't dyno it). For the money spent I've very happy with the results. The immediate MPG, as in the EVC read-out, shows an average of +1 mile per gallon thus far. We'll see after a tank or two.


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  #63  
Old 07-12-2013, 09:55 AM
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Chris In Marshfield Chris In Marshfield is offline
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Quote:
Originally Posted by theweavman View Post
I believe one of the reasons you may often now find more than one spark plug per cylinder is due in part to the manufactures trying to improve on fuel economy to meet govt mandates.... Having additional spark plugs, give a more complete burn of the fuel air mixture in each cylinder, which should produce better combustion, thus improving gas milage and performance.... Chrysler is not the only company using multiple spark plugs per cylinder
That's a similar reason that my airplane has two plugs per cylinder - to help with more complete fuel burn. That and to have backups in case one set goes out. No place to pull over in the sky if something goes wrong.

When you've got a 360 cubic inch four cylinder, that's a lotta gas to burn!

I personally think that two plugs per cylinder is a fine idea, albeit a bit spendy when you have to replace them.

~Chris
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  #64  
Old 12-27-2013, 08:36 AM
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Quote:
Originally Posted by RAMeister View Post
Hello all,

A bit of an update on my aforementioned 16ea - MOPAR Iridium Spark Plugs, S&B Cold Air Intake (CAI) and a Diablosport I1000-DCX INtune...

All-in-All - FANTASTIC!!

I ask for and quickly received a custom tune from Diablotoona that really made it all come together. The drive-ability and responsiveness (as in throttle response) is greatly improved, seems to have a considerable improvement in power (no I didn't dyno it). For the money spent I've very happy with the results. The immediate MPG, as in the EVC read-out, shows an average of +1 mile per gallon thus far. We'll see after a tank or two.


Is this (SP-143877AA) the part number for the spark plugs you have ?
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Last edited by Silvercreek; 12-27-2013 at 08:44 AM.
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  #65  
Old 01-19-2014, 09:06 PM
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mine has no where near 30k miles but is a little over 2 years old should i be thinking of doing this soon?
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  #66  
Old 01-26-2014, 07:02 PM
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Quote:
Originally Posted by Chris In Marshfield View Post
That's a similar reason that my airplane has two plugs per cylinder - to help with more complete fuel burn. That and to have backups in case one set goes out. No place to pull over in the sky if something goes wrong.

When you've got a 360 cubic inch four cylinder, that's a lotta gas to burn!

I personally think that two plugs per cylinder is a fine idea, albeit a bit spendy when you have to replace them.

~Chris
Actually the reason for dual plugs is the shape of the hemi pistons and combustion chambers. Drag racers found out a long time ago with a Hemi, either Mopar or HD shovelhead, (yes the shovelhead is truly a hemi) ran better and made more power with dual plugs. With only 1 plug the flame has to travel up and over the dome to burn the fuel on the far side. This meant that the flame traveled slower and some fuel was not burnt. By using a plug on both sides of the domed piston it increases the rate of burn insuring a faster more complete ignition of fuel.

As far as aircraft I would imagine that both plugs in the same cylinder have completely separate ignition systems in a redundant setup incase of failure of one. Really would suck to have an ignition failure when flying, can't just pull over to the side of the road and wait on a tow truck!
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  #67  
Old 01-26-2014, 08:29 PM
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Quote:
Originally Posted by Silvercreek View Post
Is this (SP-143877AA) the part number for the spark plugs you have ?
Yes, see post #56...
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  #68  
Old 01-27-2014, 05:28 PM
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Quote:
Originally Posted by glcarter View Post
Actually the reason for dual plugs is the shape of the hemi pistons and combustion chambers. Drag racers found out a long time ago with a Hemi, either Mopar or HD shovelhead, (yes the shovelhead is truly a hemi) ran better and made more power with dual plugs. With only 1 plug the flame has to travel up and over the dome to burn the fuel on the far side. This meant that the flame traveled slower and some fuel was not burnt. By using a plug on both sides of the domed piston it increases the rate of burn insuring a faster more complete ignition of fuel.

As far as aircraft I would imagine that both plugs in the same cylinder have completely separate ignition systems in a redundant setup incase of failure of one. Really would suck to have an ignition failure when flying, can't just pull over to the side of the road and wait on a tow truck!

My single cylinder DR650 motorcycle has 2 plugs, and it's not a hemi .
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  #69  
Old 01-27-2014, 09:26 PM
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For what it's worth, the modern 5.7L "hemi" is not a hemi.
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