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2-Cylinder Flywheels....

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Ron

02-28-2002 17:32:45




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I hear so much about stroking them, but I don't hear anything about balancing that with any increase in flywheel MASS..... The large 2-Cylinder tractors start to "Lunge" at about 750 RPM... The "Strokers" will make that even worse--unless the RPM's are increased, or the Flywheel mass is increased... Has anyone given this any thought???? That "Lunge" is where the Flywheel "Whips". and breakes the crank....

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smoker

02-28-2002 20:01:50




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 Re: 2-Cylinder Flywheels.... in reply to Ron, 02-28-2002 17:32:45  
Can they (the complete motor) be balanced? Since the only part that comes apart from the tractor; or on mine anyway; is the jug/block, a machine shop can't balance the whole motor can they? I'm not sure, just throwing out ideas.



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Gman

03-03-2002 17:41:43




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 Re: Re: 2-Cylinder Flywheels.... in reply to smoker , 02-28-2002 20:01:50  
Smoker you can static balance the assembly. Now I haven't done this,but I would like to try it sometime. Assemble clutch disc and flywheel on crankshaft then make you a saddle for the crank to sit in ,you would want to hold contact with crankshaft to a very minium.I was going to get me four new ball bearings and have the machine shop make me a thin collar to slide up on the bearing(to reduce crank contact) then make a support for the assembly. Now this want be as good as spin balancing but a lot of machine shops aren't set up to spin this much weight,but I beleive you will be close enough that the difference want be noticable. Gman's two pennies worth

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G Taylor

03-04-2002 19:38:48




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 Re: Re: Re: 2-Cylinder Flywheels.... in reply to Gman, 03-03-2002 17:41:43  
How about supporting the journals on an air cushion from the shop compressor? A couple of lower bearings,custom sleeves & airboxes with dozens of orfices drilled should do the trick.



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JDGnut

02-28-2002 21:53:04




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 Re: Re: 2-Cylinder Flywheels.... in reply to smoker , 02-28-2002 20:01:50  
Well... I talked to lots of people about this.. and I had decided completely against it, because of the low RPMs.. but after looking at a bunch of flywheels, I decided to give it a shot... I had the rotating assembly balanced.. flywheel, crank and clutch.. spun balanced.. and the pistons and rod weight balanced... I do not have the engine running yet.. and they had to take a ton out of the flywheel and clutch.. it is very expensive to add weight to the flywheel. (at least the way they wanted to do it.) Next time I will try to add my own weight before I have them spin the rotating assembly... I do not know if this was the right thing to do... at least on a JD I don't have to pull the tractor apart to replace the flywheel and clutch if it doesn't work... (I also think the machine shop has had enough of my big JD stuff.. they didn't like having to lift that rotating assembly all the time.. hahaa.. Oh well.. they said they could do it.. I should have it running in the next few months... (I think I have been saying that for a while.. but maybe... )
JDGnut

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G-MAN

02-28-2002 20:28:51




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 Re: Re: 2-Cylinder Flywheels.... in reply to smoker , 02-28-2002 20:01:50  
I'm pretty sure the process of balancing only includes the rotating assembly (with the rods, pins, and pistons of course, which are also part of the reciprocating assembly). This process involves matching the weights of the pistons, rods, bearings and pins to gain as equal weight as possible. And also balancing the weight of each above mentioned assembly to the crankshaft. Once again, I'm not sure, but it seems to me that since the rod journals are offset 180 degrees on a two cylinder crank, the reciprocating assemblies will balance each other providing they weigh the same amount. I have read that installing aluminum pistons in a G for instance, will cause more vibration than with the original cast iron units. I'm not sure why this is however. Maybe an engineer (Clooney) can enlighten us on this. I've also heard that regardless of how well weights are matched, an engine is only truly balanced at one specific rpm. Just my 2 cents.

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Gman

03-01-2002 01:07:13




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 Re: Re: Re: 2-Cylinder Flywheels.... in reply to G-MAN, 02-28-2002 20:28:51  
I have a '51 "G" about as big as you can get without moving the cam,static balanced the rods and Pistons one rod and one piston(25 lbs) the crank was stroked to 9.25,I assume the machine shop balanced it alone without the clutch drive disc,and with petcocks open it will stir the dust and rgravel up. This is the smoothest "G" I have till you hammer down on it,and it's a pure joy to hear it run,so I didn't make a great deal out of the balancing maybe I'm just lucky.It viberated quite alot when I first started it,till I remembered the LP distributor turns oppose of a standard distributor. By the way this is a 7.5 engine which makes it more amazing how smooth it runs,no hic-uping or coughing . Boring you guys but I'm sort of proud of the '51 Later The original Gman

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G-MAN

03-01-2002 05:37:40




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 Re: Re: Re: Re: 2-Cylinder Flywheels.... in reply to Gman, 03-01-2002 01:07:13  
Sorry if I took your name Gman. I just use it because I use it in Lycos chat also. I can change it if you want me to LOL. The un-original G-MAN.



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Gman

03-01-2002 17:57:25




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 Re: Re: Re: Re: Re: 2-Cylinder Flywheels.... in reply to G-MAN, 03-01-2002 05:37:40  
G-man I think the Hyphen seperates just fine,I think most guys can tell by the drift of the post which one it is so no problem. Gman Ky P.S. I think there is a Gman in Tenn.



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Ron

03-01-2002 06:08:18




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 Re: Re: Re: Re: Re: 2-Cylinder Flywheels.... in reply to G-MAN, 03-01-2002 05:37:40  
I was thinking more about the "Flywheel Effect" of more Mass==Heavier flywheels for more stroke... Yes, all JD 2-Cylinders are balanced in the clutch driver, and the flywheel... We are dealing with the "Bottom" of the RPM Scale here...!!!! Horse Power is only an "educated guess" at these speeds..!! And the ONLY way you can carry Smooth Torque to the wheels is to have enough flywheel on a Big 2-Cylinder...

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chad

03-01-2002 17:11:21




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 Re: Re: Re: Re: Re: Re: 2-Cylinder Flywheels.... in reply to Ron, 03-01-2002 06:08:18  
i hear ya ...its like square baleing hay with too small of a tractor the baler wont spin at a constant speed..... i once heared of a modified deere with two flywheels joined together to make it run smoth with high horse power....chad



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