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Thread: Piston and rod balancing
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01-25-2015, 05:40 PM #91
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01-25-2015, 05:46 PM #92
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.
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01-25-2015, 05:54 PM #93
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01-25-2015, 05:57 PM #94
Ballance shaft was the best thing to happen to the 4.3 V-6 Chev.
Dave1980 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"
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01-25-2015, 06:42 PM #95
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01-25-2015, 06:45 PM #966000 RPM
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01-25-2015, 06:55 PM #97
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
Dave1980 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"
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01-25-2015, 06:58 PM #986000 RPM
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01-25-2015, 07:24 PM #99
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01-25-2015, 07:25 PM #100
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
Dave1980 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"
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01-25-2015, 07:45 PM #101Scream And Fly VIP
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01-25-2015, 07:51 PM #102Scream And Fly VIP
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01-25-2015, 08:00 PM #103
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..
Dave1980 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"
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01-25-2015, 08:04 PM #1047000 RPM
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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.
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01-25-2015, 08:12 PM #105Scream And Fly VIP
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