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John Deere G Flywheel extra weight

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Gman

05-28-2001 18:47:33

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Will adding more weight to flywheel give more torgue and power at the end of track,thinking about adding additional weight to flywheel,have to run open classes anyway so I need all the power I can muster up any input????? Gman

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The Dukester

06-02-2001 07:59:29

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Re: John Deere G Flywheel extra weight in reply to Gman, 05-28-2001 18:47:33

Years ago, at our local county fair, I saw an unstyled John Deere A using two flywheels bolted together at the pulls. It was a deadweight sled they were pulling and I can well imagine the extra inertia of that setup did help break that sled loose which looked like it was most of the battle in that kind of pull. To me, this is a poor type of tractor pull, and is pretty scary, as all the major pullers let their tractors rear up at least 30 degrees or more, buy nobody seems to get hurt-except the tractors, that is.

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JDog

05-29-2001 09:14:15

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Re: John Deere G Flywheel extra weight in reply to Gman, 05-28-2001 18:47:33

IT will make more power with a heaver flywheel. It will only help because of the uneven fire of the JD. To get max power from a G, you need to add about 100 lbs. You can bolt a wheel weigth to the flywheel but make sure it is centered. I've seen 15HP gain from adding 60lbs.

Good luck

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Duh!

06-04-2001 11:49:24

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Re: Re: John Deere G Flywheel extra weight in reply to JDog, 05-29-2001 09:14:15

Abody in motion tends to stay in motion till
acted upon by a outside force i.e. gravity or a
pull sled. The heaveir it is the more force is
requried to slow. More pull at the end of the track.

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G Taylor

06-07-2001 11:30:12

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Re: Re: Re: John Deere G Flywheel extra weight in reply to Duh!, 06-04-2001 11:49:24

The energy has to be replaced after it's used if it's to be avalable again.There isn't enough energy stored in a 200lb flywheel alone at 600rpm to pull a sled 12" in the 6500lb class. The flywheel smooths the impulse loads on the gear train. It will also allow a few less rpm when lugged to the last putt before stalling. Extra weight will allow a high compression engine to lugg to a low rpm like a modest compression engine. The otherwise identical high comp engine will put out more power at the same rpm by the way.

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JDog

06-07-2001 16:35:14

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Re: Re: Re: Re: John Deere G Flywheel extra weight in reply to G Taylor , 06-07-2001 11:30:12

How do you know that? Have you dyno a JD with weight added to the flywheel? Or are you acting like burns and making up a story as you go? This type of bad infomation can cause someone to waste time and money just so you can look like you know something.

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G Taylor

06-07-2001 21:35:58

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Re: Re: Re: Re: Re: John Deere G Flywheel extra weight in reply to JDog, 06-07-2001 16:35:14

Do the math & figure out the stored energy.At low rpm it isn't very much compared to what's required to pull a sled another 12". Burns stretchs the occassional story but at least he's always polite.

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Gman

05-30-2001 13:09:44

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Re: Re: John Deere G Flywheel extra weight in reply to JDog, 05-29-2001 09:14:15

JDog if I'm not mistaken the extra weigh creates Kinetic energy. thanks for comments my machining bill is going to be big I'm afraid. Gman

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G Taylor

05-29-2001 21:53:46

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Re: Re: John Deere G Flywheel extra weight in reply to JDog, 05-29-2001 09:14:15

With the same amout of air/power mixture into the engine how does the extra flywheel weight add combustion efficiency?

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JDog

05-30-2001 20:37:07

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Re: Re: Re: John Deere G Flywheel extra weight in reply to G Taylor , 05-29-2001 21:53:46

How? you ask. You dyno the tractor. Change to a custom made heavy flywheel. Dyno the tractor again. 16 more horsepower. End of story.
If you want more details, ask that smartass burns (or what ever his name is). In his little dream world, he knows it all.

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G Taylor

05-31-2001 21:40:30

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Re: Re: Re: Re: John Deere G Flywheel extra weight in reply to JDog, 05-30-2001 20:37:07

How does a heavier flywheel allow the engine to burn more air/fuel mixture? That's where the "power" comes from. All a flywheel does is absorb & release kenetic energy. Some other factors had to change or the dyno was sensitive to the 180/540 firing order. I maynot always agree with Burns, but respect him for being one of the most polite on this board.

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burns

05-31-2001 05:17:22

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Re: Re: Re: Re: John Deere G Flywheel extra weight in reply to JDog, 05-30-2001 20:37:07

I see that I have made another friend.

Smartass....yes
Serious.....no

Was the weight added to an orginal flwheel? Was the starter ring added. Can you describe the design. I don't plan on going this route, just curious.

Have a good one.

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Gman

05-31-2001 06:04:50

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Re: Re: Re: Re: Re: John Deere G Flywheel extra weight in reply to burns, 05-31-2001 05:17:22

Burns I'm still in the thinking stage for the present,but I think I'm goingto use a 4' thick donut 21' dia.with a 16" hole in center.I got a locking device on crankshaft to eliminate side thrustit's 1 1/2 " thick and fits over center of flywheel held on by two 5/8" bolts and 3/4" bolt in flywheel,then I'm going to use 1/2"plate to fill in between flywheel lock and 4"donut. By putting the donut on outer edge of flwheel were the centrifical force is the greatest,this donut will weigh approx.150 lbs. I will weld the flwheel lock 1/2" plate and donut together and machine to were they look pretty good,I beleive this will do the job. Later Gman

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G Taylor

05-28-2001 21:16:34

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Re: John Deere G Flywheel extra weight in reply to Gman, 05-28-2001 18:47:33

The extra weight if properly balanced reduces drivetrain stress, reduces tire spin at the end of the track & allows the engine to be lugged further before stalling.

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burns

05-28-2001 19:37:41

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Re: John Deere G Flywheel extra weight in reply to Gman, 05-28-2001 18:47:33

Well Gman without getting into the technical crap of whether or not a reciprocating flywheel has potential and/or kinetic energy. I am offering my humble opinion.

With 540 degrees of crankshaft rotation without a power stroke, any Deere relies on its massive reciprocating parts to carry the engine until the next power stroke. Now if you add weight to the flywheel, I would think that you could maintain the torque needed to maintain a higher rpm. I also think that you reach a point of having to much weight. If you are running in 2nd or 3rd gear and the sled is set aggressively, you are going to reach that point in the track where you are going to call upon that extra weight. If you don't have it spinning fast in this short period, I think you may be disappointed.

IMHO

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G Taylor

06-09-2001 21:04:30

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Re: Re: John Deere G Flywheel extra weight in reply to burns, 05-28-2001 19:37:41

All true Burns & more. More weight doesn't add power, it just smooths out the power application. Or we would be putting 2000lb flywheels on stock "B's" & winning the 8000lb class. While the flywheel stores kenetic energy the amount is equal to a dozen or so power pulses. Just count the "putts" from idle to redline when full throttle is applied. Yes it does help when it's down to an inch or two between 1st & also ran. Certainly allows lugging to a lower rpm before stalling.

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I'd like to know

06-11-2001 11:39:01

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Re: Re: Re: John Deere G Flywheel extra weight in reply to G Taylor , 06-09-2001 21:04:30

How can you say that it won't work if you have never tried it?

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