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spark plugs

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Greenpully
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PostPosted: Fri Jul 17, 2020 4:09 pm    Post subject: spark plugs Reply to specific post Reply with quote

Can I use non resistor spark plugs in an engine that came from factory with resistor plug?Will non resister plugs put more load on electronic ignition system? Why was resistor plugs used in any engine? Thank You GP
 
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Janicholson
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Joined: 30 Jan 2004
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Location: St. Cloud, MN

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PostPosted: Fri Jul 17, 2020 4:18 pm    Post subject: Re: spark plugs Reply to specific post Reply with quote

You can it will work I would gap the new plugs at about .035 to .040". Resistor plugs raise the voltage at which the spark jumps the gap. (as does resistor wires) the intention is to raise the spark voltage. The resistor wires also eliminate most of the radio static as well.. Jim
 
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Billy Shafer
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PostPosted: Fri Jul 17, 2020 4:56 pm    Post subject: Re: spark plugs Reply to specific post Reply with quote

I would stay away from Champion plugs. I had 6 fail in one week. My brother bought a weed eater. Would not start. Replaced the plug with an NGK. Started up fine. Champion is not what they used to be.
 
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T.R.K.
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PostPosted: Fri Jul 17, 2020 5:02 pm    Post subject: Re: spark plugs Reply to specific post Reply with quote

I have fixed several Husqvarna engines with resistor plugs that somebody decided didn't need a resistor spark plug and then brought it to me because it didn't run right.

It screws up the timing with them because the ignition module is looking for the resistor in the plug to time its spark.

The resistor sparkplug was originally invented to minimize radio interference from the ignition system. The same reason for resistor spark plug wires.

Just go to a tractor show where they have a parade. If somebody is standing close by talking about each tractor on the P.A. system, you will know the ones that don't run resistor wires and resistor plugs. The P.A. system gets all staticey when those tractors drive by.
 
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racered57
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PostPosted: Fri Jul 17, 2020 5:26 pm    Post subject: Re: spark plugs Reply to specific post Reply with quote

the gap would be the greatest resistance in the circuit, an open circuit in fact. fascinating. Now throw in a few extra atmospheres and some voc and snap bang poof if your lucky!
 
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sotxbill
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PostPosted: Fri Jul 17, 2020 5:53 pm    Post subject: Re: spark plugs Reply to specific post Reply with quote

CVPost-Janicholson wrote:
(quoted from post at 19:18:11 07/17/20) You can it will work I would gap the new plugs at about .035 to .040". Resistor plugs raise the voltage at which the spark jumps the gap. (as does resistor wires) the intention is to raise the spark voltage. The resistor wires also eliminate most of the radio static as well.. Jim


Bingo... What he said...
 
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Fawteen
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PostPosted: Sat Jul 18, 2020 12:47 am    Post subject: Re: spark plugs Reply to specific post Reply with quote

In my experience (mostly small engines) Champion has been junk for 40 years.
 
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MarkB_MI
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PostPosted: Sat Jul 18, 2020 1:57 am    Post subject: Re: spark plugs Reply to specific post Reply with quote

So...why would you want to? You have a specific spark plug recommended by the equipment manufacturer, and you have any number of substitutes available from other plug brands. You're not going to get any improvement in performance, if that's what you're thinking. At best, the non-resistor plug will be a buck cheaper than the equivalent resistor plug.
 
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Charles in Aus.
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Location: Victoria , Australia

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PostPosted: Sat Jul 18, 2020 3:08 am    Post subject: Re: spark plugs Reply to specific post Reply with quote


Absolutely Fawteen !
In 1978 I put a brand new Champion plug into the left hand cylinder of my Yamaha 500 . Finger tight , then just snug and the thread sheared right off and stayed in the head ! Magpies roosting in the tree nearby flew away from the swearing . Ive never used one since .
 
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John T
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PostPosted: Sat Jul 18, 2020 3:58 am    Post subject: Re: spark plugs Reply to specific post Reply with quote

Sure, it would "work" and the world will not end, but if the system was designed to use resistor plugs that would be my choice.

John T
 
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Indiana Ken
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PostPosted: Sat Jul 18, 2020 4:37 am    Post subject: Re: spark plugs Reply to specific post Reply with quote

CVPost-Janicholson wrote:
(quoted from post at 17:18:11 07/17/20) You can it will work....Resistor plugs raise the voltage at which the spark jumps the gap. (as does resistor wires) the intention is to raise the spark voltage....Jim


This is new to me. My understanding is/was that the spark occurs once the voltage ionizes the gas/air between the plug gap. I am puzzled; how does the resistance, change the voltage level required for ionization?
 
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karlinpa
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PostPosted: Sat Jul 18, 2020 5:23 am    Post subject: Re: spark plugs Reply to specific post Reply with quote

i wont use champion either tryed them twice through the years had no luck reading this see nothing changed
 
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DR. EVIL
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PostPosted: Sat Jul 18, 2020 8:39 am    Post subject: Re: spark plugs Reply to specific post Reply with quote

All this hate for Champion spark plugs! You guys must be doing something WRONG, they work fine for me!
Had a diesel pickup for a daily driver for 23 years, only replaced glow plugs once. The platinum plugs in newer cars run much longer that the plugs in your 1950 & 1960 vintage cars and trucks. But whether it's in an air cooled Kohler, my Stihl chain saw, leaf blower, string trimmer, or one of my FARMALLS, CHAMPION plugs work for me.
 
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Billy Shafer
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PostPosted: Sat Jul 18, 2020 9:07 am    Post subject: Re: spark plugs Reply to specific post Reply with quote

When you have six plugs fail in a week. That tells you something. Put in NGK never had a problem.
 
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marloweg
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PostPosted: Sat Jul 18, 2020 9:29 am    Post subject: Re: spark plugs Reply to specific post Reply with quote

only plug i use are champion . if you have a Dodge you better run Champion
 
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