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Author Topic:   Balancing?
eaton89
Dirt Freak

Total posts: 268
posted January 28, 2005 06:50 PM  
Has anyone checked the balancing on a Jr, speedway or midwest assemblies and were they balanced well. I've heard some of these companies dont get them very good but was wondering if anyone has checked them out and what they found.

racin78p
Dirt Freak

Total posts: 333
posted January 29, 2005 12:33 AM  
My 355 has a rotating assembly from Jr. Motorsports. When we ordered it we had the "claimer balance" done. It's really nothing more than matching up the rods/pistons weights. No real metal removal that I know of. It held up real nice, and for the money I think it was worth the peace of mind knowing I could turn it tighter without going BOOM! Turned it 7000 a few times. If I remember right, the pistons/rods were within a couple of grams of each other. Not bad. For our new motor, I am going to spend the money and have a local engine shop balance everything "just right". The cost will be at least double, but I am going to be turning this motor alot tighter, so,...

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racin78p
if it ain't fun, then don't run

iowatoolman
Dirt Freak

Total posts: 369
posted January 29, 2005 02:01 AM  
the last balance job i had done cost around 100 bucks
most stock motors will turn 6800 all day long
i like them to turn 10000 all day long

drive hard or drive home

racin78p
Dirt Freak

Total posts: 333
posted January 29, 2005 03:03 PM  
Hey iowatoolman, where are you getting balancing done for a C note? Does that include flywheel, harmonic balancer and internal guts? I gotta pay around $200 for all the afore mentioned (but a GREAT job done!). If it's close enough to Northeast Kansas, maybe I'll take a drive.

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racin78p
if it ain't fun, then don't run

zeroracing
Dirt Forum Champ
Total posts: 1876
posted January 29, 2005 10:03 PM  
my current mod motor is not balanced. turn it 7200-7400 most every lap, even on a half mile. bearings always look new, lots of races on the motor.

BCracing
Dirt Full Roller

Total posts: 32
posted January 30, 2005 09:23 AM  
LOL@ 10000 all day long--what are u running formula 1 ?? my last hobby motor I bought a "balanced" Eagle rotating assembly, didnt do any other balancing, turned 7200-7300 every night and some nights as high as 7600 got 58 nights on it right now with out refreshing it--planning on even maybe putting a few more nights on it this year before we freshin it up

eaton89
Dirt Freak

Total posts: 268
posted January 30, 2005 05:48 PM  
This is why I asked. I havent run a balanced motor yet. I usually have something else cause problems first. I want to get a balanced rotating assemblie but was told sometimes they dont do a good job. So I was woundering if I should just buy the parts and take it to my machinist. It costs a little more money that way. But after hearing everyones replies I dont think I need to worry. Thanks!!

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