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More spark plug questions?
https://slantsix.org/forum/viewtopic.php?t=23624		 Page 2 of 3
Author:  sandy in BC [ Sun Jun 17, 2007 10:15 am ]
Post subject: 
7 pin hei

thanks for the clarification on extended tip vs projected tip
Author:  Sam Powell [ Sun Jun 17, 2007 11:34 am ]
Post subject: 
Thanks for the tip on the radiator cap. I see what you are saying. If I had a coolant bottle, with the current set up it probably would not suck the fluid back out of it anyway. I have purchased a remote filler and new cap which will get spliced into the upper hose as soon as I work out the over flow bottle thing. But for now Dan, which NGK plug should I put in here to get a colder plug in it? It is a 64 head with the tubes. I could try to figure this out on my own of course, but you seem to have the lowdown on this kind of stuff, and I appreciate your help very much.

Sam
Author:  sandy in BC [ Sun Jun 17, 2007 11:52 am ]
Post subject: 
The early head plug to use is the NGK ZFR5N plug. I use it in my car and am very happy with it.
Author:  SlantSixDan [ Sun Jun 17, 2007 1:29 pm ]
Post subject: 
If there were such a thing as a ZFR6N, that'd be one step colder, but there's no such plug, so if you want to try a colder plug you'd be moving away from the extended-projected tip. There are various 6-heatrange NGK plugs available. What is the nature of your ignition system?
Author:  Sam Powell [ Sun Jun 17, 2007 3:19 pm ]
Post subject: 
MSD 6. It is timed by the ECU, and the spark is distributed through a stock distributor. The coil is a stock coil. If you can recommend a better one, I will happily buy it. I bought an MSD blaster and then knocked it off the bench and damaged it, and went out in disgust, and got a stock one. Thanks Dan.
Sam
Author:  Matt Cramer [ Sun Jun 17, 2007 3:47 pm ]
Post subject: 
For the record, I'm running NGK ZFR6F-11 plugs on my Dart. It took a call to NGK to figure that one out - after explaining to the NGK guy that yes, you can put ZFR5N plugs in a slant six and they are normally the best choice even though their manual doesn't show it. The ZFR6F plug has a slightly shorter reach and is one range colder.
Author:  Sam Powell [ Sun Jun 17, 2007 3:58 pm ]
Post subject: 
Thanks Matt. I will go buy the tomorrow. Who carries them in stock to your knowldege. The extended tip rotor Dan recommended was ordered in from NAPA. It only took a day to get it, but they did not carry in in stock. According to Anothersix, this will help.

Sam
Author:  sandy in BC [ Sun Jun 17, 2007 4:19 pm ]
Post subject: 
14mm, 3/4" reach, 5/8" hex, gasket seat, resistor, ISO length, projected extended tip, V-power (v-grooved center electrode), .044"gap
Author:  Matt Cramer [ Sun Jun 17, 2007 4:44 pm ]
Post subject: 
IIRC, I found mine at O'Reilly's.

And when I start the Dart back up again, it'll be using an MSD 6 ignition with a MSD High Vibration coil (not really necessary, but I had it left over from a bike experiment).
Author:  SlantSixDan [ Sun Jun 17, 2007 5:54 pm ]
Post subject: 
Yeah, one of the NGK "6" plugs. Which ones to buy depends on how exotic you want to get (How much you want to spend...) as well as obvious mechanical parameters. The ZFR6F-11 would be a fine conventional choice. Its reach is actually the same as the ZFR5N, but the electrodes are slightly shorter. ZFR6FIX-11 is the Iridium version which is quite costly but might well be particularly well suited to your turbo application. The -11 at the end of the plug number indicates a gap of 0.044", which ought to be just about right for your ignition system.

The stock coil is going to have a little trouble keeping up with your MSD. I like the Blaster coil; you may want to buy another of those and refrain from dropping it this time ;-)

That long-tip rotor is going to work quite nicely with your ignition system. Put it together with a Standard-Bluestreak CH-410X cap.
Author:  Sam Powell [ Sun Jun 17, 2007 7:04 pm ]
Post subject: 
Is the iridium for durability? That absolutely sounds like a made up element. You know, like "what element will help you clean the junk out of your garage?" Iridium. "Or how do you get unwanted guests to leave early?" Serve them iridium. Thanks for the info, everyone.
Sam
Author:  SlantSixDan [ Sun Jun 17, 2007 7:54 pm ]
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Nope, it's an actual, honest-to-grapefruit, real element.
Author:  sandy in BC [ Sun Jun 17, 2007 7:57 pm ]
Post subject: 
Iridium is the latest magic element.

My top of the line snowboard has Iridium in the base to make it faster....and it actually is. The theory/BS is that the iridium holds heat .....melts the snow under the board allowing it to slide more freely.

~Shrug~
Author:  Sam Powell [ Mon Jun 18, 2007 4:59 am ]
Post subject: 
I read Dan's link,. Very interesting. It sounds as if iridium plugs would, in theory, last pretty much forever. I wonder how the iridium plays into the heat range idea, if as you say about your snowboard, Sandy, that the iridium holds the heat better. One would assume that the clever engineers at NGK took that into account. I think until I am sure where I want to stay, plug wise, that I will get that standard material plug. I might try to go colder yet if it still seems needed, or helpful.
Sam
Author:  LUCKY13 [ Mon Jun 18, 2007 7:58 am ]
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I have had great results with the Iridium plugs in turbo apps ( 600hp Mits 4G63 engines & Buick GN's). With a hotter coil behind them they really come to life. They dont like NO2 though. But they do resist spark blow out better than normal plugs, I could run a wider gap with them and they would still fire. And they do last very good. And the engine really showed a better, crisper, response.

I would get the tune up dead nailed before I spent money on them though. At $10.00 a pop, you want to get the right heat range the first time if you can.


Jess
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