Re: balance ?
[Re: bonefish]
#1228598
05/07/12 10:43 AM
05/07/12 10:43 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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No... your changing the reciprocating weight so it would MOST LIKELY end up with a different bob weight and need to change the crank weight.... but it depends on how much weight your talking about with the pistons... JMO... I'm no pro 
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Re: balance ?
[Re: bonefish]
#1228599
05/07/12 11:26 AM
05/07/12 11:26 AM
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Joined: Nov 2004
Posts: 3,544
Syracuse,NY
CompWedgeEngines
master
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master
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
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Unless you KNOW the weights of the 12.5 pistons, AND can match that weight with your new pistons ( I doubt it), you'll need to rebalance. It is possibloe at time sot get pistons close, and swap wrsit pins for tool steel, and hence take out wieght of the piston assembly, but unless you know all the weights, hard to say. Balancing is not an option on a race engine, you simply need to do it right. 
RIP Monte Smith
Your work is a reflection of yourself, autograph it with quality.
WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
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Re: balance ?
[Re: bonefish]
#1228601
05/07/12 12:15 PM
05/07/12 12:15 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
i was just thinking if you balanced the pistons in relationship with on another it would be the same end result,like take the lightest piston then the second lightest and duplicate the percentage of the differance.
They/you balance the pistons to one another on any
balance job but if the weights of the pistons are greater
or lesser than the ones you have been running then
the crank needs to be changed in weight
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Re: balance ?
[Re: bonefish]
#1228604
05/07/12 12:50 PM
05/07/12 12:50 PM
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Joined: Jan 2003
Posts: 5,894
Florida
Locomotion
master
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master
Joined: Jan 2003
Posts: 5,894
Florida
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Quote:
i was just thinking if you balanced the pistons in relationship with on another it would be the same end result,like take the lightest piston then the second lightest and duplicate the percentage of the differance.
To help put it into perspective, the "counter-weights" on the crank shaft are just that - weights to "counter" the weights of the rods and pistons while everything rotates. A balance machine as well as gram weight scales are required to do it right and minimize vibrations.
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