What spark plugs for 340

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I run Autolite 65’s, they are cheap, work and I don’t care changing them like underwear. Whenever I go to the parts store I tell them I will take all they have. I think I have done it enough that the store computer has upped the “quantity to stock” in that store. :)
 
jazak5 said:
similar set up 10.5

heavy cam/ 3000 stall converter 3.23 sure grip /factory avs carb 91 octane /alcohol free with a bottle of 108 boost every tank

E3 .46 with pertronix converstion excellent throttle response in 2.02 J heads THEY WORK
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E3’s lost power in a test my brother ran on a 2 liter Cosworth on the dyno compared to a normal plug. They are junk and a marketing gimmick. Other have shown them to be junk also… But suit yourself…
 
Because one type of plug loses power on a an engine.....does not mean it will lose power on all engines. Have you watched DVs recent you tube on spark plugs?
 
Scody21 said:
E3’s lost power in a test my brother ran on a 2 liter Cosworth on the dyno compared to a normal plug. They are junk and a marketing gimmick. Other have shown them to be junk also… But suit yourself…
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E3s are total snake oil. Junk.
 
RustyRatRod said:
Then go with Champions. That WOULD be an upgrade.
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I bought 24 Autolite 65 platinum on sale plus a rebate. Made them around a dollar each. I normally buy copper plugs for a points ignition, but the price was the same. Supposedly platinums extend the heat range. I don't know if they do, but no complaints the car runs strong.
 
S'cuder said:
I bought 24 Autolite 65 platinum on sale plus a rebate. Made them around a dollar each. I normally buy copper plugs for a points ignition, but the price was the same. Supposedly platinums extend the heat range. I don't know if they do, but no complaints the car runs strong.
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The more exotic metals do last longer. That's about the only benefit as far as I know.
 
I for one, am very happy that Splitfire, E3 & others etc took the time & effort to try something new. Otherwise, we would still be using the two piece 18mm plugs that my 1938 Harley used...
 
Multiple ground wire electrodes aren’t new. They have been tried in several forms over the decades.

I may test some different configurations including the Vizard deal but that costs money. A lot of money in testing for little possible gains.
 
This is my story on Splitfire plugs. Back in the early to mid-90's I had a 1985 C4 Auto Corvette with Air Flow Research aluminum heads, Arizona Speed and Marine runners, extrude honed intake manifold, ported throttle body, TPIS cam kit, roller rockers etc... Nice 12 second car. Anyways I always used Bosch Platinum plugs, but everywhere you went you saw the ads for Splitfire plugs and how well they worked, and that they made more power etc... One day I was at the local Western Auto and there were the ads on the counter for the Splitfire plugs. I just decided to buy a set and put them in the car. I went home and in front of the garage, I took out the Bosch Platinum plugs, and just chucked them on the grass behind me, and installed the Splitfire's. Took the car out for a spin and I immediately knew that it was down on power, it was a noticeable difference. I went back home, retrieved the Bosch Platinum plugs from the grass, cleaned all the dirt and grass off them and put them back in the car. Threw the Splitfire plugs into the garbage. I later learned that Splitifre had a satisfaction guarantee and that I could have taken them back for a refund, but the garbage truck had already taken them...
 
Bewy said:
I for one, am very happy that Splitfire, E3 & others etc took the time & effort to try something new. Otherwise, we would still be using the two piece 18mm plugs that my 1938 Harley used...
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Yeah, but do you use them?
 
Scody,
No I haven't used the brands listed in post 34. But I have tried Pulstar plugs & got a noticeably smoother idle with them.
I am also grateful to Charles Kettering. The story goes: his friend was starting his car with a crank handle when the engine kicked back & the handle broke his friend's leg; friend subsequently died from infection [ early 1900s ]. Kettering was very upset & vowed to find a better/safer way to start an engine....& invented the starter motor.
My earlier point was/is that we should be thankful some people took risks to improve a product or device.....or we would still be using crank handles.
 
A friend tried those Splitfires 20 years ago. They blew out all around the casing past the porcelain.
Crap.. I always use an NGK plug..
 
Bewy said:
Scody,
No I haven't used the brands listed in post 34. But I have tried Pulstar plugs & got a noticeably smoother idle with them.
I am also grateful to Charles Kettering. The story goes: his friend was starting his car with a crank handle when the engine kicked back & the handle broke his friend's leg; friend subsequently died from infection [ early 1900s ]. Kettering was very upset & vowed to find a better/safer way to start an engine....& invented the starter motor.
My earlier point was/is that we should be thankful some people took risks to improve a product or device.....or we would still be using crank handles.
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I appreciate invitation and improvements of things. Sometimes it just doesn’t work out as hoped, case in point are the splitfire plugs, can they even it purchased anymore? Soon enough the E3 plugs won’t be available.
 
furrystump said:
I run Autolite 65’s, they are cheap, work and I don’t care changing them like underwear. Whenever I go to the parts store I tell them I will take all they have. I think I have done it enough that the store computer has upped the “quantity to stock” in that store. :)
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I run them in the Nopar and the Harley. Less fouling from over carbed and cammed fun
 
lemondana said:
The first prefix R stands for resistor. I found out many years ago that my 68 340 GTS didn't run as good with the resistor plugs as the standard N9-Y. Might be that is just me. But then again I ran around with stainless solid core plug wires-they wrecked havoc with people's TV reception before cable.
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Anyone know the equivalent plug in autolite for RN9YC? Thx in Advance!
also maybe the best place to buy a correct Mopar Tan cap & Rotor?
 
johnnycuda said:
Anyone know the equivalent plug in autolite for RN9YC? Thx in Advance!
also maybe the best place to buy a correct Mopar Tan cap & Rotor?
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Autolite’s belong in the Garbage Can… just like e3 spark plugs and Fram oil filters

NGK BKR6E or BKR5E or the Champions your running…
 
Scody21 said:
Autolite’s belong in the Garbage Can… just like e3 spark plugs and Fram oil filters

NGK BKR6E or BKR5E or the Champions your running…
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NGK's are for Foreign cars i would never use them in my mopars thx!
been running Autolite's in all my old cars for a very long time its just plugs are getting harder and harder to find these Days
 
johnnycuda said:
NGK's are for Foreign cars i would never use them in my mopars thx!
been running Autolite's in all my old cars for a very long time its just plugs are getting harder and harder to find these Days
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when you started using AutoLites back in the day they were American made and quality. When the corporate greed took over, it was all about the bottom line and cut corners so quality went down the drain as it is today with Autolite. You think that Autolite of today as it was yesteryear, your highly mistaken and your running hot garbage in your car, suit yourself….
 
Scody21 said:
Autolite’s belong in the Garbage Can… just like e3 spark plugs and Fram oil filters

NGK BKR6E or BKR5E or the Champions your running…
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Champion plugs also belong in the trash . I'v had excellent luck with autolite plugs. Back in the day when I did use Champion plugs they were usually good for a couple thousand miles at best.
 
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