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#1
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Kohler M20 spark plugs
Just thought I would share some information about the Kohler Magnum 20 , I was doing some regular maintenance and decided to try the Autolite xp 26 spark plug. I can say without a doubt the engine runs a lot better in a noticeable way such as easy starting and throttle response also seems to have or hold the governor when you really put a load on it. So I thought I would try a new set of the champions rv17yc it definitely runs better with the Autolite xp, I hope this helps someone.
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#2
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It's in your head. I assure you.
Iridium basically handles high energy spark better, and thus lasts longer. The small magneto in your M20 doesn't make a hot enough spark to see an advantage of a $7 spark plug. Pretty basic spark plug rule says use what the manufacturer recommends. Kohler says use a copper plug. |
#3
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This is really more of a question than a comment. I'm no spark plug expert. I know what to put in what engine and why... With that said I have never tested or studied or compared one against the other.
If an iridium plug handles high energy better, could that mean that its also more efficient with a lower energy spark? I thought as plugs progressed and matured from plain ole copper to what we have today the whole idea was to be more efficient. I'm not saying you will see a noticeable difference in running necessarily especially across just 1 or 2 cylinders but do you think they would be somewhat more efficient?
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Cooperino 100, 104,125, 126, 2x129's, 804, 1211, 1641 |
#4
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Been my experience that spark plugs spark.
Only times I saw a difference was when the wrong heat range was used and either they fouled, or burned a window in a piston. But even at that, most times it really was not the plug that was the problem. The best preforming plugs were always the ones on sale. |
#5
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I agree. It's hard in most standard applications to put in a plug that makes a vast improvement. Definitely not a power improvement. Maybe take away a cylinder knock. However, with the increased voltage (which also made for a much larger plug gap because the flame could actually jump the distance) the need for a plug that would not burn up because necessary. Also, a lot of ignition systems went back to wasted spark (for emission reasons) and that caused the need for double (platinum/iridium) tipped plugs. So.... in those applications there is a need for the "high end" spark plug. But in an old point or mag system, they are just a waste of money.
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#6
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I'm also a bit worried they may create a flame that will burn a piston. The design of of a plug creates a consistent burn. A "better" spark may ignite the fuel too quickly and while it may appear to give a power increase, it's detrimental to the life of the engine.
I'm kind of thinking this through as I post trying to come up with a good answer as to why it appears to give a power increase, and why that isn't necessarily a good thing. |
#7
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Quote:
I would post findings here but i looked at about a dozed sites and all said close to the same thing.
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Cooperino 100, 104,125, 126, 2x129's, 804, 1211, 1641 |
#8
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I’m only telling you guys about my experience with the 2 differences. The engine had regular Autolite 26 in it, im not saying that it ran bad but I just wanted to try something else, and it started a lot better with the xp plug VS new champions, I’m not trying to start a debate about waisting money or arguing about it, just saying it works for me, if I can get time to do a video I will so I might be asking how to post a video.
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#9
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#10
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I'm thinking an old flathead ain't going to be too sensitive to a little timing advance or pre-ignition @ 6.5 to 1 CR.
But I haven't done any scientific work to that fact. Now take a SBC of the 60's vintage with 10.25 CR and cheap gas, will take the heads off the pistons in a heartbeat. BTDT and it wasn't pretty. |
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