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Post by dangercat on Jun 21, 2019 10:42:21 GMT -5
Just wondering if anyone feels there is any advantage to using NOS OEM spark plugs in their saws. By this I mean if a saw called for a Champion or AC Delco spark plug and you could get NOS ones, is there any advantage or disadvantage? Or are modern ones the way to go? Growing up my grandpa who retired as the parts department manager at a Chevy dealership always said use the exact spark plugs that the manufacturer called for because the engineers knew what an engine needed and the plug was designed exactly for it.
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Post by sweepleader on Jun 21, 2019 11:03:22 GMT -5
I would agree with your grandpa to the extent that the OEM engineers knew the sparkplug they used for testing the engine worked the way they wanted it to.
Having spent much of my adult life fixing cars, a lot of years professionally, I have looked at a lot of spark plugs.
My feeling on substituting a different brand is find out what the OEM plug was and interchange directly from that number/manufacturer only. Do not sub in several steps as manufacturers all have different systems of grading and you can wind up a long way from the original if you go through several stages of substitution.
On the other hand, put in anything that fits and watch how it works. But you must watch. You can degrade performance with the wrong plug. AND understand it is possible to damage an engine by using something that is too far off or does not fit mechanically.
Now let's talk about fuel/oil ratios, eh? :{)
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Post by dangercat on Jun 21, 2019 11:39:49 GMT -5
I would agree with your grandpa to the extent that the OEM engineers knew the sparkplug they used for testing the engine worked the way they wanted it to. Having spent much of my adult life fixing cars, a lot of years professionally, I have looked at a lot of spark plugs. My feeling on substituting a different brand is find out what the OEM plug was and interchange directly from that number/manufacturer only. Do not sub in several steps as manufacturers all have different systems of grading and you can wind up a long way from the original if you go through several stages of substitution. On the other hand, put in anything that fits and watch how it works. But you must watch. You can degrade performance with the wrong plug. AND understand it is possible to damage an engine by using something that is too far off or does not fit mechanically. Now let's talk about fuel/oil ratios, eh? :{) Fuel/oil ratio??? are you supposed to mix it for chainsaws??? haha I am not opening that can of two cycle!! Appreciate the insight, I use a lot of NGK plugs, but have come across a good deal on a lot of NOS Champion plugs and wondered if performance would be as good, worse or no change than using modern plugs. |
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Post by sweepleader on Jun 21, 2019 14:38:08 GMT -5
I don't have a high opinion of Champion plugs, even though they are/were specified by a lot of OEMs.
NGKs have always been good to me, this is where we get into that can of two cycle. I am stopping right here.
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Post by 5terrysupersaws on Jun 21, 2019 15:42:38 GMT -5
NOS spark plugs would be desirable for period correct restorations, where every detail must be met for the die hard "authentic" collectors... or for saws where no cross reference plugs are available ( XL-500 ). Now, what Champion numbers are in the lot ?? ...... C.A.D. is a tough nut to crack !!  |
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Post by dangercat on Jun 21, 2019 18:05:51 GMT -5
NOS spark plugs would be desirable for period correct restorations, where every detail must be met for the die hard "authentic" collectors... or for saws where no cross reference plugs are available ( XL-500 ). Now, what Champion numbers are in the lot ?? ...... C.A.D. is a tough nut to crack !! The lot has (3) N-3G (3) D-9 (5) CJ-14 (24) CJ-4, primarily interested in the CJ-4 for my 750's! |
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Post by 5terrysupersaws on Jun 21, 2019 18:29:42 GMT -5
NOS spark plugs would be desirable for period correct restorations, where every detail must be met for the die hard "authentic" collectors... or for saws where no cross reference plugs are available ( XL-500 ). Now, what Champion numbers are in the lot ?? ...... C.A.D. is a tough nut to crack !! The lot has (3) N-3G (3) D-9 (5) CJ-14 (24) CJ-4, primarily interested in the CJ-4 for my 750's! Not sure what the others fit, don't see them on the Homelite plug chart.....so do you really need 35 spark plugs..  SUGGEST NGK-BM7A as a Champion CJ-4 replacement .. |
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Post by dangercat on Jun 22, 2019 12:34:39 GMT -5
The lot has (3) N-3G (3) D-9 (5) CJ-14 (24) CJ-4, primarily interested in the CJ-4 for my 750's! Not sure what the others fit, don't see them on the Homelite plug chart.....so do you really need 35 spark plugs.. SUGGEST NGK-BM7A as a Champion CJ-4 replacement .. Well i just need the 24 CJ-4s for my 24 750s haha nah I think I done talked myself out of it and noted on the NGK replacement! |
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Post by rowdy235 on Jun 25, 2019 18:14:11 GMT -5
I'll pour some fuel on the fire, I run nothing but NGK plugs in all my equipment, from my Super 2 to my toyota pickup. Never had an issue with them when cross-referencing to champion/autolite/etc.
I have had two plugs DOA and both were champions. Not to knock them as I know they are usually a good product.
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Post by dangercat on Jun 25, 2019 20:03:59 GMT -5
I'll pour some fuel on the fire, I run nothing but NGK plugs in all my equipment, from my Super 2 to my toyota pickup. Never had an issue with them when cross-referencing to champion/autolite/etc. I have had two plugs DOA and both were champions. Not to knock them as I know they are usually a good product. I am with ya on the NGK plugs, I use them in all my small engines. In my Chevy truck I run AC Delco though, i'm sure NGK would be fine but the advice from my Grandpa just sticks in the back of my mind! |
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