| From | Message |
kota318
Dodge Dakota
JOIN HERE
10/03/2003
00:52:03
|
 Subject: plug question
IP: Logged
Message:
are there any drawbacks to using a colder plug like the autolite 3923s?
|
ScojoDak
Dodge Dakota
JOIN HERE
10/03/2003
08:30:35
| RE: plug question
IP: Logged
Message:
none.
|
Dirk
Dodge Dakota
JOIN HERE
10/14/2003
19:37:48
| RE: plug question
IP: Logged
Message:
what's the advantage of it?
|
Nate
Dodge Dakota
JOIN HERE
10/14/2003
22:26:22
| RE: plug question
IP: Logged
Message:
Those plugs are colder than the recommended 5224's. Folks almost always use 3923's along with a 180 degree thermostat. You can search the archives for discussions on what exactly these switches do, but in a nutshell, they add a little performance (more hp) at the expense of fuel mileage (enriches fuel to air ratio) and engine wear (hotter running temp) by making the truck think the engine is colder than it really is.
|
kota318
Dodge Dakota
JOIN HERE
10/14/2003
22:50:44
| RE: plug question
IP: Logged
Message:
so, pretty much a bad idea to do if it adds to engine wear?
|
Nate
Dodge Dakota
JOIN HERE
10/14/2003
23:27:19
| RE: plug question
IP: Logged
Message:
Whoops! I got one small thing backwards. The 180 thermostat/3923 plugs combo runs the engine at a colder temperature, so the engine is colder, not hotter! But this creates more smog. Plus, more unburned fuel passes through unburned. So, more smog, less mpg, questionable engine wear. I don't like it. Others will disagree.
|
gen1dak
Dodge Dakota
JOIN HERE
10/16/2003
01:14:40
| RE: plug question
IP: Logged
Message:
Okay, regarding engine wear, once you're at the 180 degree range, the wear issue is miniscule. There are very slight reductions in wear as temp pushes past 190 degrees, but much beyond that and you're just burnt toast. Running a 180 eliminates 90% of the hot pocketing in the coolant system. The point is to eliminate/prevent detonation/pre-ignition while making max power. Cooler plugs, etc, do not fool the engine. Cooler plugs are shielded more to resist thermal buildup, which tends to be more of an issue when an engine is modified for higher power. If the plugs didn't maintain a cooler tip temp, they'd cause detonation by virtue of their tip temp, thus defeating the purpose of the engine mods. Also, detonate an engine, and a few microns more wear will be the last thing on your mind. It's much, much more important to keep fresh oil in the engine if you're concerned about wear. The 180 will allow the computer to run maximum ignition advance since the detonation sensor will not be hearing detonation and retarding the timing. Also, that 10 degree temp reduction will help maintain higher power output, which means you'll not need to run it as hard, which means it'll last longer.
|
99DAK
Dodge Dakota
JOIN HERE
10/16/2003
11:16:51
| RE: plug question
IP: Logged
Message:
I've seen it stated many times here that the 392* is no help for a stock motor, and possibly worse than the stock "extended tip" (or whatever they call it) plug. My experience bears this out. When I bought my truck (@47K, stock) it had just been tuned up with 3924s - I put factory spec Bosch Platinums in and picked up 2 mpg and better top AND bottom performance. I know this for a fact based on two 1200 mile trips. First trip (w/Autolites) avg. 20mpg with frequent downshift (OD - 3rd) on hills with cruise control on @ 75mph. Second trip (w/Bosch) 22mpg and NO downshifting on hills. And yes, both trips were identical routes, with no other changes to the truck other than plugs. (It bears adding that I had no pinging problems with either plug).
Of course different individual engines will always produce slightly different results, this is just my experience, but if the 3923/3924 is so much better why doesn't Dodge use the shorter/colder plug?
|
| | P 1 |
|
Post a reply to this message:
Username Registration: Optional
All visitors are allowed to post messages
|
