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Lightening/balancing

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Lightening/balancing

Post by mrbeige on Fri Jul 24, 2009 3:42 am

So, if I wanted to make sure the con-rods and pistons were all the same weight, what sorts of tools would I need? I mean for the pistons, a very good quality set of electronic scales would be fine, but what about con-rods? balancing them wouldn't be that straight forward would it?

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Re: Lightening/balancing

Post by junkie on Sat Jul 25, 2009 1:31 am

You obviously take the lightest rod and piston and make them the same as that at the least, i have a very good set of electronic scales for weighing gas charges into fridges and they only go to the nearest 5 gram which possibly is not enough for this purpose but brilliant for weighing the holiday suitcase.

They need balancing together rotationally like a wheel and tyre i think.
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Re: Lightening/balancing

Post by CorradoVR6-Turbo on Sat Jul 25, 2009 12:42 pm

Im sure you should balance each end of the rod,big end and then little end and then the combined weight.

Im sure someone will jump in to correct this.

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Re: Lightening/balancing

Post by mrbeige on Sun Jul 26, 2009 2:27 am

Yeah I thought you'd take the lightest of each component to use as a reference. Smile

There must be a special way to measure the big and little end of a rod separately.

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Re: Lightening/balancing

Post by kevhaywire on Mon Jul 27, 2009 9:35 am

2 sets of scales? One end of the rod on each scale? Same as corner weighing a car.

We're not in the 1950s any more Stu Very Happy I don't think even OE cast rods are more than 10g adrift.

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Re: Lightening/balancing

Post by mrbeige on Mon Jul 27, 2009 9:39 am

I suppose not, but I like the idea of getting as much out of OE parts as possible. You'd need two fairly accurate scales though. I wouldn't think a set of Salter digital kitchen scales would do the job Laughing

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Re: Lightening/balancing

Post by mic_VR on Mon Jul 27, 2009 11:56 am

Is it a simple case of removing weight anywhere when looking at rods? I'd have thought it was key not only to remove weight but making sure that weight was removed in such a way as to not unbalance the crank.

Hate to say it but seems a lot more scope for it going wrong than right if doing it by guess work.
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Re: Lightening/balancing

Post by dirtytorque on Mon Jul 27, 2009 2:07 pm

hmm..something I'd give to a pro tbh.
Thats one thing you want rotating nice and smooth,no harmonics.
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