[Jim Zeek]

Went to Maple Grove today for some tuning. Made a few passes with Autolite plugs then switched to AC Rapidfires to see if there is a difference between a .99 cent plug and a $3.99 plug. No difference. Timeslip was .005 slower with AC's in same setup. So I will go back to the Autolite plug (plug #85) and save a few dollars to put somewhere else.

[Jim Zeek]

Went to Maple Grove today for some tuning. Made a few passes with Autolite plugs then switched to AC Rapidfires to see if there is a difference between a .99 cent plug and a $3.99 plug. No difference. Timeslip was .005 slower with AC's in same setup. So I will go back to the Autolite plug (plug #85) and save a few dollars to put somewhere else.

[Craig Berkheimer]

I run the Autolight #75. I have success with these. Their getting tough to find around here. I'm paying $1.49 each. Is the #85 cooler?

------------------
Outlaw Pontiac Racers Association
"For Those Who Live The Legend" www.outlawpontiacs.com


JBP 416ci on Gasoline
#16 Dports 10.8-1 Compression
Weight - 3275
10.5 - 29.5 TIRE
Best ET: 60ft=1.39
1/8 =6.49@104mph
1/4 =10.29 @ 129mph

[This message has been edited by Craig Berkheimer (edited 10-28-2000).]

[Half-Inch Stud]

I use the Autolite 85's...but go further on to cut the ground lug back at the bend. Then whack the ground lug toward the center post for gap. My way of dealing with ping.

Went for a blast up the highway today after the front-end alignment and got all kinds of pinging: Going to investigate.

Suppose I'll fix the ping problem; then buy 8 autolite 85's [save em for atco]...then try heads-up ET/MPH comparisons on my modified lug vs unmodified/gapped.

[Gach]

Yeah the #85 are cooler.The # 75 seem to work the best.

[RPM]

75 & 85 are the same heat range. The 85 is a resistor plug and the 75 is a non-resistor. That is why the 7X are getting hard to find. I use 73's which seem to work good.

[PONTIAC DUDE]

NGK's

[boykoman]

ditto that Dude!

[David Holmberg]

I know where you can get a good deal on "Used" NGK plugs..... Right Dude... [img]/infopop/emoticons/icon_biggrin.gif[/img]

[Alex]

Craig,
This is not an advertisement but,
Autolite #75 @ $1.21 each(but must buy in packs of 4)on www.wrenchead.com
Dude what # NGK ??

[This message has been edited by Alex (edited 10-29-2000).]

[RPM]

Are the NGK's measurably better?

[PROBRD]

Switched from Autolite #85's to NGK XR5 plugs and slowed down .05 until I jetted carb up 4 jet sizes. What's up with that? Did I use the wrong ones? Went back to the Autolites and the bigger jets and it slowed back down .05 and jetted the carb back down and it picked back up. Have stayed with the Autolites since.

[SiberWolf]

Mine would baerly run on Autolites, even after playing with the timing and gaps heavily. Standard AC Delcos were doing okay, but i decided to try the Rapidfires and was able to gain .5 sec 0 - 60. Haven't made it to the track yet to get a new slip and see what i picked up in the 1/8th (no 1/4 mile track around here [img]/infopop/emoticons/icon_frown.gif[/img])

SiberWolf

[Larry Navarro]

...if its any consolation, i switched from AC's to a set of BOSCH platinums(not the 4prong), on a previous super duty T/A with H-O's HC-63 cam and idle quality seemed to have smoothed a tad. the cam was pretty wild ...244/[email protected]

[Paul Spotts]

Plugs are plugs when running an MDS or any other similiar unit. I always used the #75 Autolight (better then the 85 - only need them for a radio) US made is why I use them - never had luck with Champions. NGK and Accel plugs worked just as good - so I go for the least expensive. In 1999 I never changed my plugs all season in the (head hung low) lost but not forgotton 69 Bird.
The only problem with running Autolights in the dragster with a Vertex Mag is the .20 gap makes the electrode on too much of an angle - may try Marks idea - I just hate messing with electrodes

[Will]

I've found the same results as Larry with the Bosch Platinum plugs and also with the AC Rapidfire: better idle in a mostly street driven car. Overall performance remains the same though...

I've experimented with a lot of different plugs in my Nova and it definitely likes the NGKs and ACs. Champions suck. Those things will break if you look at them wrong, had one where the threads twisted off the plug and remained in the head and I did NOT apply any undue force to it.

Haven't had a chance to experiment with plugs in the Formula. Was running the Bosch platinum's in it because they were on sale and I knew they worked good.

[Gach]

Pontiac's as a rule like a hotter plug, at least the iron heads do. Aluminum heads like a little colder plug. Now the # 75 Autolite's seem to work the best. Ok so now were saying the # 85 Autolite plung is a Radio plug, hum ? plugs that have a longer electrode is a hotter plug, the # 85 Autolite's have a shorter electrode, they may be a Radio plug, but there still a colder plug. Put the two together, an you'll see. That's the reason why one number works better then the other.

Plug heat range plays a big part in weather or not one works better then the other, so if you find one that works better it's because it's a better heat range for your motor.That's why you'll find guys saying
NGK's work better in my motor, no two motors are the same, you really have to play, and find out what wroks best with your motor. Autolites # 75's seem to work best with most Pontiac motors, it's a real good plug to start with. Champions plugs though are out right Junk!

[RPM]

I also tried a set of Autolite #353 which have the short electrode. The 353 is a cold racing plug and they didn't seem to work as well as the extended electrode plugs like in my motor for everyday use. Reason I say the 73's seem to be the best for me is that with the 85's I have seen little black specs on the ceramic which I think may be an indication of some detonation starting. I don't see this with the #73 plug or with the 353. Different strokes (and plugs) for different folks (and engines). Never tried any of the Bosch or NGK and wouldn't put Champion even in my lawn mower.

[Gach]

RPM, just curious, you say you've seen black specs on the ceramic, whats the plug look like, other then that, is it super clean, or dose it have a little color to it. If it's super clean, that sounds like the motor is a little lean, could very well be detonation. Gee I never tired #73, is the tip shorter then the #75's. Hum? maybe those 85's because there a resister plug don't work to good with a 7AL MSD, an causes the motor to run a little richer.

[RPM]

The #85 ran very clean almost no color and showed some black specs on the ceramic. Never heard detonation but I'm sure I was at the initial stages of it. Using #73 they have a tan color, do not foul and no signs of det. Both the 73 and 85 are extended tip plugs unlike the #353 Autolite. For fuel, I run a mix of 92-93 and Torco 104 unleaded about 60% pump 40% Torco most of the time and cr is 9.7:1, 670 heads. Also, with the 73 the ground electrode is heavier than that of a standard plug which will probably make that part of the plug run cooler and is cut back from the center like a racing plug (353) which should expose the flame "kernel" to the mixture better.