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Minneapolis Moline Tractors Discussion Forum
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M670 compression ratio

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John G

08-26-2003 11:20:46




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I've got a M670 that is being used on a sawmill. The guy wants to change it from LP to gasoline. It has 10A4232 heads, will it have too much compression to run gasoline all day long under a load?? I'm thinking it should run 10A4210 heads on gasoline. Any thoughts or comments or suggestions welcome.




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scottAR

08-26-2003 18:45:59




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 Re: M670 compression ratio in reply to John G, 08-26-2003 11:20:46  
I would keep it on LP, especially a tractor that is running all day. The LP motors just run forever.



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John G

08-26-2003 19:09:09




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 Re: Re: M670 compression ratio in reply to scottAR, 08-26-2003 18:45:59  
I agree, but the places this guy goes, he can't always find an LP dealer and doesn't like dragging 100# tanks with him. I don't really think he knows about LP, he bought this tractor, took off the wheels, 3 point, front wheels, steering, and other stuff, then mounted it on the ugliest trailer around. ANYWAY, he's got it in his mind that the LP is no good and wants to get rid of it. I got into this because I seem to be the only one in this area with SOME MM & LP knowlege. Thanks for all the responses, I think I'll rebuild the origional LP regulator and see if I can convince him to keep the LP. Really don't want to change heads and all the other stuff, then find out it doesn't have enough power anyway. It's marginal anyway on the power end for the load. Thanks again, John

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Kelvin

08-26-2003 17:55:36




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 Re: M670 compression ratio in reply to John G, 08-26-2003 11:20:46  
having been drawn into a mess on a M5 with 4210 heads, I would suggest you get 4209 heads for it. 4210 heads will be well over 8:1 compression and by my experience, it'll spark knock (whether it bothers you or not) and will diesel on 87 octane gas. Also, from what I've read here, and the MM forum, head life is shortened. They tend to crack between the valves.



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Mopower

08-27-2003 08:22:18




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 Re: Re: M670 compression ratio in reply to Kelvin, 08-26-2003 17:55:36  
I would have to agree. I am running a bored M5 with 4210s for doing hay and odd jobs. While it has great power, it klunks when it shuts off and diesels a bit. I have some tuning to do because I like my motors to idle down about 250 rpms and this one will not run that low. You can count the revs on the Jet Star II when it idles. I do not know if it is compression/timing related, but I'd like to get the M5 idled down. I'd take any 4210 or 4232 for a good competitive pulling motor!

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Andy

08-26-2003 16:31:03




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 Re: M670 compression ratio in reply to John G, 08-26-2003 11:20:46  
I think it would be too high for regular gas. 4232's are higher than 4231. If you don't want to run it on LP, a set of 4209 or 4210 would be a lot easier on it. You can go to fiorellis MM page and get the compression ratios.



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BMG

08-26-2003 14:56:27




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 Re: M670 compression ratio in reply to John G, 08-26-2003 11:20:46  
John,
I've got 10A4231 heads on my 1966 M670 Super gas. They aren't the original heads as they're painted yellow and the rest of the engine is brown. It seems to run fine. It dieseled a little when you shut it down but since I adjusted the timing by ear it seems fine. Sure starts up nice! I just run regular 87 octane fuel. Haven't really worked it real hard but previous owner used it as primary tractor throughout the 70s and early 80s. I think he pulled 4 or 5 bottom plow in our SE Michigan soil. Elevation here is not too much above sea level.

Brian

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Alan K

08-26-2003 20:21:12




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 Re: Re: M670 compression ratio in reply to BMG, 08-26-2003 14:56:27  
Brian, was just wondering, what do you get for "mileage" (ha ha) or gallons per hour with your M670 gas?
Is it reasonable for it's size?



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BMG

08-27-2003 15:32:08




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 Re: Re: Re: M670 compression ratio in reply to Alan K , 08-26-2003 20:21:12  
Alan,
I haven't really had it long enough to find out. I don't get to use it too much with 40+ other Molines around. I'm guessing its got to be pretty thirsty though.

Brian



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