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  1. #91
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    This is odd crank I have on my log splitter. Yes both pistons go up and down together. Unlike any 2 cylinder I've ever seen before.

  2. #92
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    Quote Originally Posted by BarryStrawn View Post
    No argument from me that custom work can make an outboard run smoother. Same as it has always been for any mass produced engine. But there is no solution to make a V6 have perfect or even very good balance. You can just make them suck less than the factory job. If it is worth the time and expense is up to the individual.
    Well I have to agree with ya ... from the crankshaft wanting to throw itself on the floor , to rollin harmoniously in the V blocks has to be rated as "sucking less" ...

    Marcus:
    Chaz, a balancing shaft is needed if you want to actually balance the engine, not just weight match the components of the rotating assembly.

    Only a cross-plane V8 can be balanced with crank counterweights.
    Of all the piston driven engine designs derived from steam to present , only the cross-plane V8 can be counterweight balanced ... Humm ... you must own one of them new "Wikipedia" balance machines ...

  3. #93
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    Quote Originally Posted by roadkill636 View Post
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    This is odd crank I have on my log splitter. Yes both pistons go up and down together. Unlike any 2 cylinder I've ever seen before.
    Look a the size of the counter weight on that puppy.

    Dave
    1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
    1988 BAJA Sunsport 186, 96 225 Pro Max
    79 12' Auminum, 95 Merc 9.9
    RIP Stu
    "So many idiots, so few bullets"

  4. #94
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    Ballance shaft was the best thing to happen to the 4.3 V-6 Chev.

    Dave
    1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
    1988 BAJA Sunsport 186, 96 225 Pro Max
    79 12' Auminum, 95 Merc 9.9
    RIP Stu
    "So many idiots, so few bullets"

  5. #95
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    Here is my rig for balancing this small 1.05cid RC boat racing eng.
    It spins at 260000+ RPM
    The bob is 52% of the piston rod and needles.

    Forged steel rod running on needle bearings.
    Not so much of a toy as you would think.
    Made a big difference in the reliability and RPMs of the eng.

  6. #96
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    Quote Originally Posted by Dave Strong View Post
    Ballance shaft was the best thing to happen to the 4.3 V-6 Chev.

    Dave
    It only helped the perceived vibration issues. It didnt actually correct the out of balance condition at the crank. Still beat the crap out of the main bearings.

  7. #97
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    Quote Originally Posted by wired247 View Post
    It only helped the perceived vibration issues. It didnt actually correct the out of balance condition at the crank. Still beat the crap out of the main bearings.
    True but sure made my life easier when working for GM. Spent alot of time trying to keep customer complaints down till they put ballance shafts in those motors. Even changed a few motors to prevent buy backs, good examples of piss poor ballancing of a mass produced engine. Warranty gone before crank problems.

    Dave

    Dave
    1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
    1988 BAJA Sunsport 186, 96 225 Pro Max
    79 12' Auminum, 95 Merc 9.9
    RIP Stu
    "So many idiots, so few bullets"

  8. #98
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    Yeah, one of GM's better ideas. Along with the Vega inline 4, diesel Olds V8, door pulls that remove themselves in your hand and that ever popular flaking water based paint. The taxpayer bailout being number one. I hate that company!


    Quote Originally Posted by Dave Strong View Post
    True but sure made my life easier when working for GM. Spent alot of time trying to keep customer complaints down till they put ballance shafts in those motors. Even changed a few motors to prevent buy backs, good examples of piss poor ballancing of a mass produced engine. Warranty gone before crank problems.

    Dave

    Dave

  9. #99
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    Quote Originally Posted by wired247 View Post
    It only helped the perceived vibration issues. It didnt actually correct the out of balance condition at the crank. Still beat the crap out of the main bearings.
    300k and still going strong, but anyhoo..

  10. #100
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    Yes pulled some dumd azz moves over the years but have also made some good stuff over the years. That 4.3 is probably in more sterndrives than any othe engine and they go forever. Have a few customers with the first ones in their boats and can not believe how the run those shaking things, fire em up on the hose and have to look and make sure the balancer is still on the crank.lol

    Dave
    1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
    1988 BAJA Sunsport 186, 96 225 Pro Max
    79 12' Auminum, 95 Merc 9.9
    RIP Stu
    "So many idiots, so few bullets"

  11. #101
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    Quote Originally Posted by roadkill636 View Post
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    This is odd crank I have on my log splitter. Yes both pistons go up and down together. Unlike any 2 cylinder I've ever seen before.
    Early Triumph, BSA and Norton twin cylinder motorcycles same thing. Up and down together, TDC one firing other on exhaust stroke. Yes they did vibrate.

  12. #102
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    Quote Originally Posted by Dave Strong View Post
    Ballance shaft was the best thing to happen to the 4.3 V-6 Chev.

    Dave



    Don't know for sure but weren't those the ones with the offset journals? One of the engines that required odd percentage of reciprocating weight to try and get them balanced.
    I had one in an S10 pickup and they sure were gas hogs.

  13. #103
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    I grew to hate S-10's. PINTA trucks the 2.8's were no better, lift the cab to change a motor, trans or clutch..

    Dave
    1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
    1988 BAJA Sunsport 186, 96 225 Pro Max
    79 12' Auminum, 95 Merc 9.9
    RIP Stu
    "So many idiots, so few bullets"

  14. #104
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    One of the more exotic balancing solutions is an opposed boxer engine with twin crankshafts geared together so they spin opposite directions. The cylinders line up perfectly and all reciprocating forces cancel. So all you need for perfect balance is simple counterweighting for the reciprocating mass.

    I have a couple of Evinrude triple blocks setting up on the shelf front to front and it makes me wonder how good of an engine that might make. Cut the front halves to minimum height and marry them fore and aft. Add side induction. Pair of spur gears on the crank bottoms. Twin driveshafts to twin pinions in a new lower unit. Lot of work but it would be a killer 100 cube six cylinder. If you are wondering, I generally dream this stuff up in the Florida summer when it about 120 degrees out in the shop.

  15. #105
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    Quote Originally Posted by BarryStrawn View Post
    One of the more exotic balancing solutions is an opposed boxer engine with twin crankshafts geared together so they spin opposite directions. The cylinders line up perfectly and all reciprocating forces cancel. So all you need for perfect balance is simple counterweighting for the reciprocating mass.

    I have a couple of Evinrude triple blocks setting up on the shelf front to front and it makes me wonder how good of an engine that might make. Cut the front halves to minimum height and marry them fore and aft. Add side induction. Pair of spur gears on the crank bottoms. Twin driveshafts to twin pinions in a new lower unit. Lot of work but it would be a killer 100 cube six cylinder. If you are wondering, I generally dream this stuff up in the Florida summer when it about 120 degrees out in the shop.
    Okay so what's your excuse now in the winter? Just guessing but probably 70-80 degrees there.

    I just had a vision of what your describing and now I have a headache!

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