Flywheel on a b
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Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=153203
Printed Date: 23 Aug 2025 at 4:23pm
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Topic: Flywheel on a b
Posted By: lowell
Subject: Flywheel on a b
Date Posted: 20 Aug 2018 at 5:31pm
| Is a b flywheel internal balance or external balance |
Replies:
Posted By: Gary
Date Posted: 20 Aug 2018 at 6:13pm
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I believe they balanced the Flywheel by drilling holes in the outer circumference between the clutch surface area and the ring gear Gary https://www.ebay.com/itm/Allis-Chalmers-B-IB-tractor-AC-engine-flywheel-w-starter-ring-gear-clutch-/323362225804" rel="nofollow - https://www.ebay.com/itm/Allis-Chalmers-B-IB-tractor-AC-engine-flywheel-w-starter-ring-gear-clutch-/323362225804 |
Posted By: lowell
Date Posted: 20 Aug 2018 at 6:17pm
| Ok but are they balance neutral balance or to the engine |
Posted By: Stan R
Date Posted: 20 Aug 2018 at 7:51pm
|
https://www.google.com/search?q=neutral+balance+or+to+the+engine&rlz=1C1CHBD_enUS765US765&oq=neutral+balance+or+to+the+engine&aqs=chrome..69i57&sourceid=chrome&ie=UTF-8" rel="nofollow - https://www.google.com/search?q=neutral+balance+or+to+the+engine&rlz=1C1CHBD_enUS765US765&oq=neutral+balance+or+to+the+engine&aqs=chrome..69i57&sourceid=chrome&ie=UTF-8 Especially at the rpm they run at |
Posted By: lowell
Date Posted: 20 Aug 2018 at 7:56pm
| That still don't help me out but thamks anyway |
Posted By: AaronSEIA
Date Posted: 21 Aug 2018 at 5:49am
|
Its a solid chunk of steel that has holes drilled in it for balancing. I'm not sure what internal vs external balanced means. The crank has no counterweights on it that I'm aware of. Turning 1800 or 2,000 no load, I'm not sure it's as critical as the 383 stroker pages I read trying to figure out what the terms mean. AaronSEIA
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Posted By: Dick L
Date Posted: 21 Aug 2018 at 6:48am
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They are balanced at the time they are manufactured. Not on the engine. The crankshafts are also balanced at the time of manufacture within the tolerance specs at the time. If you want to run 4000 RPM's you will need the crankshaft and flywheel balanced as well as rods and pistons. For normal use all flywheels for those engines are interchangeable. |
Posted By: lowell
Date Posted: 21 Aug 2018 at 9:31am
| Thanks so they are neutral balance that is what I needed to know |
Posted By: Stan R
Date Posted: 21 Aug 2018 at 11:52am
| That is what the link said that I posted! Lol |
Posted By: lowell
Date Posted: 21 Aug 2018 at 12:20pm
|
Ok I'm going to try to adapt a motor that is external balance to it so I will have the flywheel balance that way |
Posted By: steve(ill)
Date Posted: 21 Aug 2018 at 6:29pm
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To help explain what Lowell is doing......... some motors have the counter weights on the crank cut or drilled so that the MOTOR is balanced within itself... Then you can add a balanced flywheel to it later... EXTERNAL balance means the motor is not balanced by drilling the crank weights.. The FLYWHEEL is made to bolt to the crank and the flywheel BALANCES the motor.. You can normally tell this by looking at the flywheel.. If it has large cast pockets and is obviously a couple pounds heavier on one side compared to the other, then it goes on a motor that has NO INTERNAL BALANCE...... If the flywheel looks like a solid plate of steel with teeth on the outside, ( with a couple small balance holes), then it goes on an INTERNAL BALANCE motor and the flywheel has its own balance holes. ------------- Like them all, but love the "B"s. |
Posted By: lowell
Date Posted: 21 Aug 2018 at 6:34pm
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Yes it was I want to put a 4.3 Chevy v6 in one but the engine is external balance it has a big weight on one side but the flywheel can only go on way That why I was asking about it |
Posted By: steve(ill)
Date Posted: 21 Aug 2018 at 6:35pm
Here is a picture of a flywheel used to balance a non balanced motor. This would be EXTERNAL BALANCE...... it is obvious that the flywheel is not balanced itself.. It MUST be connected to an out of balance motor to balance the UNIT. ------------- Like them all, but love the "B"s. |
Posted By: Steve in NJ
Date Posted: 21 Aug 2018 at 7:24pm
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Never saw a 4.3L V6 with a big weight on one side. The 4.3L Chevy V6 is internally balanced just like a sbc. They're basically a 350 V8 with two cylinders missing off the rear. I had a Carbureted 1985 vintage 4.3 in my 29 Model A P/U, I have a 92' vintage 4.3 in my 31' Model A Vicky, and a 97' vintage counter balanced shaft Vortec 4.3 in my 67' Nova Wagon. The Vortec is still internally balanced between the crank and the hamonic balancer. The balance shaft is a weighted shaft located in the lifter valley of the engine and spins in the opposite direction of the crankshaft to offset the vibrations that are created by the inconsistant power stroke angles over 360 degrees of crank rotation. Doesn't have anything to do with the crank balancing. They all can use a 6" sbc 350 harmonic balancer on them. I believe the counter balance shaft engines started around 1995-on. What's cool about the 4.3 is you can use all sbc parts on the front of it. That's what I have on all my cars. Pulleys, pumps, balancers etc. HTH Steve@B&B ------------- 39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife |
Posted By: lowell
Date Posted: 21 Aug 2018 at 7:33pm
Well they do if I could post a picture 
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Posted By: Steve in NJ
Date Posted: 21 Aug 2018 at 8:23pm
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Musta' read your post wrong. I thought you were talking about the crankshaft having a weight on one side. You're refering to the flywheel having a weight. Thats a flywheel balance weight. I have those on all my flywheels also. Still has nothing to do with the crankshaft and harmonic balancer. All Chevy flexplates line up one way on the crank. Some cranks on the older sbc's had a dowl pin. Install it, slide the torque converter up to it and bolt it up. I've been using the same flywheels for years with my 4.3's. They work fine on my vehicles. Should be a nice install in your B. I like the idea! I'm a B guy, and a 4.3 guy. Go for it!! Steve@B&B ------------- 39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife |
Posted By: lowell
Date Posted: 21 Aug 2018 at 8:30pm
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So the b flywheel will have to be balanced to the 4.3 and put on the right spot When gm went to the one peace rear main seal they put the weight on the flywheel But the 454 and 400 had the weight on the flywheel before them |
Posted By: Steve in NJ
Date Posted: 21 Aug 2018 at 8:48pm
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Ahhh! But the 400 small block with its 4 1/8" bore and special counterbalanced crank had a special stepped harmonic balancer that was ONLY used for the 400 sb. Now your talking peaches from apples. Not sure about the BBC. I wasn't a BB guy. If you're going to use the B flywheel, then I would have it balanced as an assy with the crankshaft rods, pistons, & balancer. If you're going to use the flexplate with an Auto Trans behind it, then you wouldn't have to do anything. I have plans on installing a Mercruiser 160 4 cylinder in my WC with A/T after I retire when I have more time to "play".... Good luck and have fun doing that install!! Steve@B&B ------------- 39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife |