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Reload this Page M18 vs. M20 question
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  #1  
Old 04-16-2014, 08:25 PM
Tunames Tunames is offline
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Default M18 vs. M20 question
I have an 1812 with 900+ hrs. I also have a 2072 with 600 hrs. I just got last fall. The m20 in super runs so smooth compared to the m18 in the 1812. Its ran like that for the last 7 yrs. Is that typical of the 18's and 20's? Would the 18 be in need of a rebuild? or would it be better to repower it? and with what? I've always liked the 1812 but I'm REALLY liking the 2072! Advice and opinions welcome....
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Old 04-17-2014, 10:39 AM
Tunames Tunames is offline
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I've rebuilt carb (walbro fixed main jet) fuel pump is good,good consistent spark. I haven't pulled the heads to decarbon. I've started running sea-foam in the gas seems to help but still sounds like one cylinder cuts out intermittently sorta. I just thought it was normal for the magnums! Until I got the 2072....
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Old 04-17-2014, 11:24 AM
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Sam Mac Sam Mac is offline
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They should both run about the same. The 18 may need a little TLC.
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Old 04-17-2014, 02:16 PM
J-Mech J-Mech is offline
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Both engines are identical except for the carbs. Should run exactly the same. Tune the 18 up, clean the fuel system, and while your at it do a compression check. Figure out what's wrong with it and fix it. It's never "normal" for an engine to run rough.
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Old 04-17-2014, 04:45 PM
Tunames Tunames is offline
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Compression is down 88lbs. Both cylinders....
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Old 04-17-2014, 05:04 PM
J-Mech J-Mech is offline
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Compression is down 88lbs. Both cylinders....
That's lower than I like to see..... but it's not horrible. Pull the heads. Clean it up, check the valves. May even just have a leaking head gasket.
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Old 04-17-2014, 05:11 PM
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Shrewcub Shrewcub is offline
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That's lower than I like to see..... but it's not horrible. Pull the heads. Clean it up, check the valves. May even just have a leaking head gasket.
Agreed! Don't forget to clean and lube the starter while it's apart
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Old 04-17-2014, 05:40 PM
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Both engines are identical except for the carbs. Should run exactly the same. Tune the 18 up, clean the fuel system, and while your at it do a compression check. Figure out what's wrong with it and fix it. It's never "normal" for an engine to run rough.
I didn't know that! So a guy could get an M20 carb and put it on an M18 and be good to go then?

Didn't mean to thread jack BTW

Edit: According to the Magnum manual, the strokes and compression are different between the two. Oh well haha
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Old 04-17-2014, 06:45 PM
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I didn't know that! So a guy could get an M20 carb and put it on an M18 and be good to go then?

Didn't mean to thread jack BTW

Edit: According to the Magnum manual, the strokes and compression are different between the two. Oh well haha
Yes, my bad, I know the stroke is different. Same bore, same jugs, same pistons. Compression is different because of the stroke.
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Old 04-17-2014, 07:20 PM
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Longer stroke should not have different compression. Unless someone has been "fixing" it. Factory compensates for it in the design.
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