Autolite AP63 spark gap ?

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Desmopower

Desmopower

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Hi, I am going to try Autolite AP63 spark plugs in my mk3, does anybody know the recommended gap size for them ? Thanks
 
I assume you just set them to factory spec as it is the ignition system/coil that determine the gap spec. 0.025-0.028" is factory spec.
 
Yeah, that what I was thinking but I thought I had read somewhere here about running the Autolite platitinium AP63's at a wider gap ? (tried looking for thead about this)
 
Seems to be coil dependant.
Look at posts 30-32
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Autolite AP63 Plugs

gosh look at all the fun I missed being a Computer Science major! All I had was the basic three semesters of eng physics and 1st semester diff eq. Physics was interesting, diff eq was, well, ugly. Glad I didn't have to go any further (or is that farther?) norbsa, your equations don't seem to...
www.accessnorton.com www.accessnorton.com
 
When I was running them, I think I had them set at 0.040" gap, but that was a long time ago...
 
I run the smaller diameter wrench double platinum APP 3923 because they are easy to find. They both happen to be gapped at .046". They come from Autolite gapped wider than any old Champion or NGK plug would have been. I have not tried a smaller gap with the Autolite plugs. I usually just make sure the ground is squarely over the top of the electrode. Even that is unnecessary, and just an old habit. .040 - .046 or try something smaller if you want to. I run a cheap dual e-coil, but don't gap the plugs for the coils. I just install the plugs and look at them once in a while. The science bores me, and I'd rather concentrate on the ride. I know there is something wrong with me, but I'm OK with it. ;)
 
Bike is running stock coils, so standard gap sounds like the way to go ? ( .025 - .028 )
 
What’s the perceived benefits of these plugs over the more normal offerings ?
 
I have always run NGK's but I have read posts here that have said that the Autolite platinium plugs are more resistant to fouling than copper plugs ?
 
Way back in the '70s I got given a box of Autolite race plugs free....half of them didn't work....after missing a couple of races messing with them....I just bought some other plugs and binned the freebies before they cost me more money!

Unfortunately, this kind of thing develops prejudices regarding a brand, even if other or later products are fine.
 
Fast Eddie said:
What’s the perceived benefits of these plugs over the more normal offerings ?
Click to expand...
About 20 years ago, Autolites were all the rage - Why? Can't rememember - easily available platinum plug maybe. I even bought a box and tried them.

I had been running Bosch Platinums up until I tried these. I had been running them for years in my competition bikes - they were very foul resistant and seemed to last forever when compared to conventional plugs. And they were readily available at the time. Even my lawnmower got them - lol.

The Autolites seemed to work about the same - no real difference. Gave a set to my dad - he had one fail on him with very low mileage. So we both switched back to Bosch.

I had not put a set of plugs in my bike for about 15 years, so 2 seasons ago, I switched to NGK Iridiums - work about the same as the Bosch's - Bosch plugs are no longer readily available where I live.

Another one of those things that, if it isn't broke, don't break it...

That's what I know.... FWIW
 
I've been using NGK iridiums for several years, but have recently switched back to Champ RN7YC, .026 gap, and I actually think they start and run better. Old school....
Jaydee
 
jaydee75 said:
I've been using NGK iridiums for several years, but have recently switched back to Champ RN7YC, .026 gap, and I actually think they start and run better. Old school....
Jaydee
Click to expand...
I think a lot of it has to do with the coil, and maybe to a lesser degree, the ignition system you are using. I am running a Harley twin lead coil - one of the stock ones the hot rod boys take off pretty much immediately after buying the bike. Ignition is Tri-Spark. It starts so quickly with the e-start, you don't even hear the starter crank. Never misses a beat when running.

Once again - stay with what works for you.
 
Bigger gap means more umph behind to get the electrons to jump forth so I would say you need a coil with greater potential.
In the early 70s did not cars start to have stronger coils to provide enough power to jump the bigger gaps? Perhaps the expensive material plugs have much less resistance but like everything else it is a case of 'what do I know'?
 
Aside from the electrical conductivity of the precious metal plugs, the biggest thing that I have noticed is that the electrodes do not suffer nearly as much from spark erosion as the old school plugs, so they maintain a more consistent gap over the long run, and last a lot longer.

I would apply this to the NGK and Bosch plugs that I have run. Jury is out on Autolites for me...
 
If running the stock coils I would keep the gap at .025". I use a Rev-Tech Harley type coil and run .035" with N7YCs. Just my opinion but .046" will probably work fine with an aftermarket coil but I would still close it down a bit.
Russ
 
Fast Eddie said:
What’s the perceived benefits of these plugs over the more normal offerings ?
Click to expand...
None other than easy to find and in my case they work with my ignition system. I have not had one foul or fail. I have a set of normal NGK resister plugs that are brand new, but I'm keeping them in a box for when they become classic collectibles. ;)
 
Derek Wilson said:
About 20 years ago, Autolites were all the rage - Why? Can't rememember - easily available platinum plug maybe. I even bought a box and tried them.

I had been running Bosch Platinums up until I tried these. I had been running them for years in my competition bikes - they were very foul resistant and seemed to last forever when compared to conventional plugs. And they were readily available at the time. Even my lawnmower got them - lol.

The Autolites seemed to work about the same - no real difference. Gave a set to my dad - he had one fail on him with very low mileage. So we both switched back to Bosch.

I had not put a set of plugs in my bike for about 15 years, so 2 seasons ago, I switched to NGK Iridiums - work about the same as the Bosch's - Bosch plugs are no longer readily available where I live.

Another one of those things that, if it isn't broke, don't break it...

That's what I know.... FWIW
Click to expand...
I have been using NGK BP7es plugs - pazon surefire ignition - stock coils, the NGK's are readly available locally but I have had a few issues with fouling due to idling and low speed running around. That is why I though I would give the Autolites a try. Just out of interest does anyone know what the Bosch platinum equivalent is to NGK BP7 ES ?
 
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