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Author Topic:   2300 crank breakage
donnie wegmann
Dirt Roller

Total posts: 9
posted April 01, 2002 08:36 PM  
having trouble with my cranks , i run a ford 2300 with stock rods w/arp rod bolts ,wiseco pistons , stock crank 10/10 ,and flywheel (1.100). non of which is balanced. (track rules dont allow it ) my cranks keep breaking at the last counterweight with no warning . i have changed blocks so i know its not the motor. motor turns around 7300/7600 rpms on a 5/8 mile dirt track . any body had this problem ? any help appreciated .

Dirt Freak

Total posts: 265
posted April 01, 2002 10:33 PM  
dont wind the motor so high or it will keep happening. run less rear gear and it wont happen. check your harmonic balancer maybe it aint workin right or maybe your crank endplay is too much. h*ll who knows maybe its just cr*ppy luck.

Dirt Forum Champ
Total posts: 711
posted April 02, 2002 07:32 AM  
2300 fords do not have a harmonic balancer, are you getting some kind of vibration? or detonation? i never had that trouble with them and revved them alot higher than that for many yrs. investigate your crank grinder he may not be putting enuff radius on your rod journals or just find a std. crank and polish it. hope this helps you ford5

Dirt Newbie

Total posts: 3
posted April 03, 2002 09:40 PM  
go have it balanced out of town and dont tell anyone...then check the stuff the other guys said...after all this is racin....

Dirt Freak

Total posts: 233
posted April 04, 2002 04:18 PM  
Stock rods and crank here. Turn 7600-8000. Haven't had broken crank in 3 years. Ford is right, there is no harmonic balancer. You really need to be able to balance the assmebly. Sounds like you need a rule change or change the gear.

Dirt Maniac

Total posts: 171
posted April 04, 2002 07:18 PM  
Not saying that it would help his problem, but there is a balancer available for the 2300.

Dirt Full Roller

Total posts: 32
posted April 06, 2002 09:38 PM  
I opinion Ford5 hit it on the head. Look at the radius on the crank jounals, if is a sharp 90 deg. there is a good chance it will break there. Some machine shops don't bother putting a radius back on their stones after they have trued it. When a crank is stressed (such as racing at high r.p.m.'s) the lack of radius gives it a weak spot.

Good luck Chuck

donnie wegmann
Dirt Roller

Total posts: 9
posted March 02, 2003 02:13 PM  
got to looking at my broke cranks and it looks like you were right , the machinist didnt put the radius cut back . thanks for the help $$$

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