Spark Plugs: Autolite Heat Ranges?

L48M20 · Dec 25, 2004

Simple question...

What are the heat range part numbers for Autolite plugs?

I have a set of AFR 210 cylinder heads and AFR recommends starting with AR3910 Autolite plugs.

I have fouled a few plugs while I try to sort the tuning...is the 3910 a cold plug or?

My local Autozone/Oreilly/Advance aren't any help especially these plugs are already special ordered.

In other words, how does Autolite number their ranges? 3920, 3930, etc?

Thanks!

dnult · Dec 25, 2004

Have you tried www.autolite.com? Looks like there is lots of info there. If you are brand loyal, most of the major spark plug manufacturers have good technical info on their plugs. You could start by crossing your autolite number to whomever's product you choose. Unfortunately, each manufacturer has their own method of heat-ranging plugs, but their tech documents usually explain the details.

GM Parts1 · Dec 27, 2004

It's a cold plug. On a scale of 1-10 10 being hot it's a 2.

I have a catalog.

L48M20 · Dec 27, 2004

Heh, thanks for the link...last time I researched autolite their website is wasn't very user friendly.

This one I can deduce that they also offer a AR 3911 which is indeed a hotter plug.

Can you tell me (using your catalog) if they have a whole range of plugs such as AR 3911-AR 3919-just different heat ranges?

Thanks a bunch...my Autozone friend said "that plug is not available (speaking of AR 3910) because it isn't in my computer...."

GM Parts1 · Dec 27, 2004

The 3910 and 3911 are power tip non resistors. 3922-3927 are resistor power tips. If you have an MSD or stero you want these anyway. 3923-3924 is mid range and should do well on a dual purpose car.

nick V · Dec 30, 2004

I'm running the 3926 - (stock for a LT1 vette) with great results!!!!!

L48M20 · Jan 3, 2005

Excellent!

I picked up a set of 3926's...I think they will do the trick and because the store had that number in stock. Just trying to get the part throttle tuned!

Thanks

L48M20 · Jan 9, 2005

Well, put ~50 miles on those plugs and what a night a day difference.

Again, mainly concerned about getting it tuned other than WOT...no more fouling, rev's cleanly, and starts better.

Thanks!

Spark Plugs: Autolite Heat Ranges?

L48M20

dnult

GM Parts1

L48M20

GM Parts1

nick V

L48M20

L48M20

Top Contributors this Month

Recommended Communities