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QUADMAN
GenIII
 
4/23/2002
00:20:25
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 Subject: QUESTION ABOUT PLUGS
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I have always been under the assumption that if you want more performance then you get a hotter plug and run higher octane, but I have seen where everyone is recommmending a colder plug. Wouldn't you only want to go to a colder plug if you were having detonation problems? I am just a bit confused and would appreciate some clarification.
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Fubar512
Dodge Dakota
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4/23/2002
10:48:08
| RE: QUESTION ABOUT PLUGS
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Quadman, there are probably several reasons why the colder, non-extended tip plugs (Autolite 3923s in particular) work better on these engines.
More then likely, Mopar chose the plug style and heat range they did for emissions considerations (remember the 195 degree t-stat?), as opposed to performance.
Also, it's likely that the extended tip of the OEM plug extends into the combustion chamber just far enough to effect performance.
A comparison of different plugs on the dyno would be the only way to prove this.
I'm not a egineer, so, my views on the matter are pure speculation, at best!
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jjj
Dodge Dakota
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4/23/2002
21:47:26
|  RE: QUESTION ABOUT PLUGS
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IMO 3923's on a non pinging engine will result in a power loss, as tested on a stock 01 5.9. Same with a 180 t-stat for everyday street use.
The extended tip moves the flame kernel and our engines have some of the highest cyl pressures available for pump gas around, around 180-185 I think.
A hotter plug is not needed unless fouling and never for extended upper rpm use. With today ignitions and fuel curves I really don't see any need to go hotter. A colder plug helps on extended high rpm usage, it disappates heat quicker and may stop preignition due to a glowing electrode. The non projected tip moves the flame kernel so it changes the whole flame front.
Of course this is just all my opinion.
Jeff
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handi2
GenIII
4/23/2002
22:10:27
| RE: QUESTION ABOUT PLUGS
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Using good new spark plugs of any kind, I dought you can tell any power differences.
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Jon
Dodge Dakota
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4/24/2002
20:45:04
| RE: QUESTION ABOUT PLUGS
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I did the 3923 plug change
1st the plugs I took out and the 3923s are excatly the same size.'
2nd my truck strats better
3rd it sounds a little better
4th a little more bottom end power
I love the plugs and will continue to ues them.
2001 QC 4.7
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Duner
Dodge Dakota
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4/24/2002
21:01:27
| Plugs?
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I haven't seen any performance gains from running colder plugs on my truck, just losses at idle and low rpm torque. I just keep fresh, clean, new ones in the engine all the time and have no problems. In the Fuel Altered/Funny car we changed all 16 plugs after every single pass. Those things don't like even slightly used plugs!
The reason that a 180 degree thermostat makes a difference is because if the engine actually runs 20 degrees cooler the fuel rails will be 20 degrees cooler and the IAT in the stock location will read slightly cooler temps also. (if I could be so bold as to borrow a word from Harlow) Both of these will add PEP! Speaking of which, why haven't we heard anything from our Autolite Ad Man yet? This is a thread about plugs isn't it?
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