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Old 15th March 2008, 23:18   #1
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Default Engine/Crank Balancing - Where can i get it done?

Where in Pune or Mumbai can I get my Engine Balanced? I've got aftermarket pistons and rods for my RD350. For the new rods to fit, the webs have to be modified and the new Wiseco Pistons weigh lesser than stock (don't have the exact figures). And so I'll have to get my crank dynamically balanced. I would want to go to someone who's been building cranks for so long that 'crank' is his middle name now. It need not be a 2-wheeler guy. Afterall, a crank is a crank.

After reading the RD350 part, I know MOST of you would suggest Ron Chinoy. But I have already dumped the option. Not because he's not good at what he does. But because I'll have to send off the crank to him and I'll miss out on learning from the whole experience.

PS: Delibrately not posted in the motorcycles section.

Last edited by dustDevil : 15th March 2008 at 23:24.
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Old 16th March 2008, 02:59   #2
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2 stroke cranks are quite a bit different from 4st because they run on needle bearings.

Does Wiseco recommend that the crank be balanced? If the weight drop is negligible, then it may not be necessary.
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Old 16th March 2008, 10:21   #3
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No wiseco did not recommend balancing as such. But the con-rods are actually for the Banshee ATV. These can be used with the RD crank,but with a little modification to the webs. That is why it'll require balancing.
Where can I get it done?
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Old 16th March 2008, 22:43   #4
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Quote:
Originally Posted by Mpower View Post
they run on needle bearings.
What is / are the reason(s) for that Mpower?

cya
R
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Old 17th March 2008, 09:14   #5
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What is / are the reason(s) for that Mpower?

cya
R

If a shell bearing or a bush bearing like in the fourstrokes is being used the crank needs to run in wet sump where it can do with the oil splash lubrication or the big end should be pressure fed; or both. The shell and bush bearings need pretty good lubrication.

This will not work with a two stroke in which the crankcase is sealed and the lube is provided by mixing the 2t in the petrol. So needle bearings are used at the big end and the small end pins. Even crank main bearings are lubricated by 2t oil in the fuel.
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Old 17th March 2008, 19:29   #6
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Is there no one who can tell me where to get my crank rebuilt???
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Old 17th March 2008, 20:08   #7
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There used to be one guy in Chennai who could do dynamic crank re balancing. He's known amongst the performance Bulleteering crowd. Maybe someone from Chennai could help you.
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Old 17th March 2008, 20:15   #8
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Is there no one who can tell me where to get my crank rebuilt???
You want to rebuild? or just balance ?
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Old 17th March 2008, 21:34   #9
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You want to rebuild? or just balance ?
I wanna Rebuild, Modify(the webs need a little modification to accomodate the new conrods) and Balance.
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Old 18th March 2008, 09:28   #10
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Quote:
Originally Posted by dustDevil View Post
After reading the RD350 part, I know MOST of you would suggest Ron Chinoy. But I have already dumped the option. Not because he's not good at what he does. But because I'll have to send off the crank to him and I'll miss out on learning from the whole experience.
I appreciate the desire to learn. Personally, If I was getting Wiseco from my hard earned money, I'd make sure I go for the best guy.

Now that you've already dumped that option, I'll try and enquire from some friends in both Pune and Mumbai
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Old 18th March 2008, 12:19   #11
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I wanna Rebuild, Modify(the webs need a little modification to accomodate the new conrods) and Balance.
PM me the details may be i can help you out, i had carried out similar job on my car engine.
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Old 18th March 2008, 15:05   #12
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well a tech question here

what do u mean by crank balancing???
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Old 19th March 2008, 01:54   #13
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If a shell bearing or a bush bearing like in the fourstrokes is being used the crank needs to run in wet sump where it can do with the oil splash lubrication or the big end should be pressure fed; or both. The shell and bush bearings need pretty good lubrication.
I think all journal bearings have to be pressure fed with oil. Splash is not good enough.
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Old 19th March 2008, 07:51   #14
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Is there no one who can tell me where to get my crank rebuilt???
Aalap, I am free on Friday 21Mar'08. Give me a call and I'll take you to the right places to get the crank balanced. I hope its the original RD crank and not the altered KB crank that is more usually found in RD's?
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Old 19th March 2008, 14:18   #15
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Quote:
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I think all journal bearings have to be pressure fed with oil. Splash is not good enough.
Yes i think you're right.

Small fourstroke engines with needle bearings at the big end can do with splash lubrication.
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