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Author Topic:   Balancing claimer motor
Dirt Maniac

Total posts: 111
posted October 11, 2005 10:11 PM  
Anyone run an unbalanced, stock, cast everything bottom end? Not sure I can justify the $150 balance on a $500 claim. Any horror stories from said combo?

-stand on it-

Dirt Maniac

Total posts: 158
posted October 12, 2005 04:48 AM  
I run them in my street stock, but I wont turn them more than 6200 RPM. All kinds of horror stories about 6500 RPM. I've moved up a class and am investing the money to have my motors balanced.

Dirt Maniac

Total posts: 138
posted October 12, 2005 07:39 AM  

I ran a 307 in a purestock class this year, unbalanced and turned it upwards of 7,000 all year with no real problems. Good set of bearings (clevite 77) and ARP bolts throughout the motor and it stayed together for me.

Dirt Forum Racer

Total posts: 88
posted October 12, 2005 10:05 AM  
150 is a small price to pay for longevity of the bottom end.I ran a 2bolt 350 with all the oem rods and crank for 5 years freshened only one time after 3 seasons of use cranking 6500 every weekend.A good line hone on the mains and balanced rotating assembly will last you a long time if well maintained.That old engine got me 18 wins and all top 5 finishes in points over those five years.

Dirt Maniac

Total posts: 192
posted October 12, 2005 10:05 AM  
my claimer engines are unbalanced, I run them under 6500 though.
I have a stock bottom end 355 ( stock crank, stock rods, and rod bolts)
Ran it two seasons until I broke a piston.

James Ott
Dirt Maniac

Total posts: 131
posted October 12, 2005 02:48 PM  
I just had this very same discussion with my engine builder. If you were building a drag or street engine he said balancing is not real important for a conservatively built engine. The engine will only only see high rpms for a few seconds, 12-14 seconds in the quarter mile?. On the other hand a circle track motor will hang up in the high rpms for long periods of time 10 mins per race?. Now you can see why it would make sense to balance the motor. Plus it will rev quicker and you can unleash a little more power. So for a $150.00 why not sounds like cheap insurance to me.

Dirt Forum Racer

Total posts: 97
posted October 15, 2005 06:47 AM  
For the five years that I have raced I have used only stock stuff, plus ARP rod bolts. Never had any of it balenced. Never had a bottom end failure. We usually run in the 3000 to 6700rpm range. I think a lot of the life of an engine is in how it is put together and how it is maintained.


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