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Correct Spark Plug Size
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Correct Spark Plug Size
Can anyone tell me what is the correct size plug to use in the Cub? I had a Champion D16 in one Cub, Champion's site calls for an RD18Y or D18Y. I had an AutoLite 386 in another Cub and AutoLite's site calls for a 3116. The Cub specs call for a .023 gap, but both AutoLite and Champion state a .025 gap for the Cub.
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Hey Guys:
Don't forget, the heat range of the plug is more important than the brand. All the plug has to do is light the mixture. If a plug lights the fire, then that's all that is needed.
Remember, a hot plug is recommended when the engine is used very little, for a short time or may be pumping a little oil. A cooler plug is recommended for a clean burning engine that works hard for extended time periods. Sometimes you just have to experiment with different ranges to see what works best for you.
And if I don't get another chance, Merry Christmas and Happy Holidays to each of you.
Don't forget, the heat range of the plug is more important than the brand. All the plug has to do is light the mixture. If a plug lights the fire, then that's all that is needed.
Remember, a hot plug is recommended when the engine is used very little, for a short time or may be pumping a little oil. A cooler plug is recommended for a clean burning engine that works hard for extended time periods. Sometimes you just have to experiment with different ranges to see what works best for you.
And if I don't get another chance, Merry Christmas and Happy Holidays to each of you.
YD, Grover and Ole Malley
‘Keepers of the Flame’
‘Keepers of the Flame’
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Yo's Dad wrote:Hey Guys:
Don't forget, the heat range of the plug is more important than the brand. All the plug has to do is light the mixture. If a plug lights the fire, then that's all that is needed.
Sonny,
You learned good. I'm proud of you.
If I remember right, I compared the plug to the fuse on a firecracker. Once it fires reliably, it makes absolutely no difference in the Bang what the fuse is made of. As far as plugs are concerned it is the heat range, not the make that determines whether it remains in condition to fire reliably.
George Willer
http://gwill.net
The most affectionate creature in the world is a wet dog. Ambrose Bierce
http://gwill.net
The most affectionate creature in the world is a wet dog. Ambrose Bierce
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- Tractors Owned: 1947 Cub "Granny"
1948 Cub "Ellie-Mae"
1968 Cub Lo-Boy
Dad's Putt-Putt
IH 129 CC
McCormick 100 Manure Spreader
McCormick 100-H Manure Spreader
Post Hole Digger
M-H #1 Potato Digger - Circle of Safety: Y
- Twitter ID: Rudi Saueracker, SSM
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George:
Thanks for the quick lesson, I appreciate it and may have learned something, ifn I can keep it in me head .
Sooo, a Champion D-16 is a colder plug than the D-21 or the NGK 2245 A-6?
If this is the case, then as Ellie-Mae only gets to frolic after a snowfall, she should be running hot plugs in the winter. As she runs a lot in the summer, then I should change to say the D-16's which were working real well this summer.
Am I getting it
Thanks for the quick lesson, I appreciate it and may have learned something, ifn I can keep it in me head .
Sooo, a Champion D-16 is a colder plug than the D-21 or the NGK 2245 A-6?
If this is the case, then as Ellie-Mae only gets to frolic after a snowfall, she should be running hot plugs in the winter. As she runs a lot in the summer, then I should change to say the D-16's which were working real well this summer.
Am I getting it
Confusion breeds Discussion which breeds Knowledge which breeds Confidence which breeds Friendship
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Rudi wrote:George:
Thanks for the quick lesson, I appreciate it and may have learned something, ifn I can keep it in me head .
Sooo, a Champion D-16 is a colder plug than the D-21 or the NGK 2245 A-6?
If this is the case, then as Ellie-Mae only gets to frolic after a snowfall, she should be running hot plugs in the winter. As she runs a lot in the summer, then I should change to say the D-16's which were working real well this summer.
Am I getting it
Rudi,
Pretty close. As I understand it, the only reasons not to use the hottest plug possible is at higher temperatures their life is shorter and they can possibly cause pre-ignition. Therefore, I think it best to change to a colder plug only if they burn up prematurely or if there is a spark knock. For most of us the D-21 (or equivalent) will work best all the time, summer or winter.
The D-16 (colder) is a good plug but is more likely to foul than the D-21 (hotter) if the engine is less than perfect. The heat range refers to the relative operating temperature of the plug... not the intensity of the spark. The hotter plugs have the ability to burn off more deposits/oil/carbon... thus remaining cleaner.
George Willer
http://gwill.net
The most affectionate creature in the world is a wet dog. Ambrose Bierce
http://gwill.net
The most affectionate creature in the world is a wet dog. Ambrose Bierce
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- Cub Pro
- Posts: 28706
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- Zip Code: E1A7J3
- Skype Name: R.H. "Rudi" Saueracker, SSM
- Tractors Owned: 1947 Cub "Granny"
1948 Cub "Ellie-Mae"
1968 Cub Lo-Boy
Dad's Putt-Putt
IH 129 CC
McCormick 100 Manure Spreader
McCormick 100-H Manure Spreader
Post Hole Digger
M-H #1 Potato Digger - Circle of Safety: Y
- Twitter ID: Rudi Saueracker, SSM
- Location: NB Dieppe, Canada
George:
Thanks much. I think I will try the D-21's and see what happens. That is exactly what happened to the D-16's - burned up, toast, crispy critters with no get up and go - it all got up and went.
BTW, that is another tidbit of info to put into Tips and Techniques!
Thanks much. I think I will try the D-21's and see what happens. That is exactly what happened to the D-16's - burned up, toast, crispy critters with no get up and go - it all got up and went.
BTW, that is another tidbit of info to put into Tips and Techniques!
Confusion breeds Discussion which breeds Knowledge which breeds Confidence which breeds Friendship
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- 10+ Years
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- Joined: Tue Feb 04, 2003 7:49 pm
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Well, after many posts on this thread, I am learning allot here! Since there are some many different brand plugs out there, all with various characteristics, I decided to try a few to see if I can "feel" differt results within my 3 Cubs. I have AutoLite 386 on one, Champion D16 in another, and now I just got a set of AutoLite 3116 (recommended at the AutoLite site for the Cub). Comparing the AutoLite 386 to the 3116, the 3116's firing tip protrudes a bit longer. I would guess that this would better center the spark in the combustion chamber. I'll pull my D16's out and compare them as well and maybe get a set og D21's as well. If the tip protrudes the same, then I would say the difference is only that one is hotter than the other. Just another facsinating aspect to learn with this old iron .... which still applies to newer engines of today! Thanks to all for the posts, thoughts, and advice.
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