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Author Topic:   2.3 ford question
Trapper
Dirt Full Roller

Total posts: 64
posted August 31, 2003 11:26 AM  
During hot laps sat. night I only turned around 6100 rpms and a yellow flag came out and I let out of it to bring the car to a restart. When I got out of the throttle the #1 rod gave up and came through the oil pan.

Is there any thing I can do to make sure this doesnt happen again. Im in the process of building a new engine with arp rod bolts but didnt know if there was anything else I could do to prevent failure when letting off the throttle. I regularly have turned this motor to 7000 with no problem and didnt anticipate failure under decelleration.

Thanks in advance for any advice.

TRAP

b4racing
Dirt Forum Champ
Total posts: 626
posted August 31, 2003 01:46 PM  
I always have my whole assembly balanced and good bolts. the stock rods are supposed to be good up to 8000 and I have had them up past that a few times. BObby

machine for speed
Dirt Roller

Total posts: 18
posted September 01, 2003 12:03 AM  
What are you having balanced? And how?

b4racing
Dirt Forum Champ
Total posts: 626
posted September 01, 2003 01:16 PM  
everything from flywheel assembly to crank pistons and rods.

machine for speed
Dirt Roller

Total posts: 18
posted September 02, 2003 01:49 AM  
Are you zero balancing the round stuff and weight matching the pistons,rods to each other? I am not understanding what you are doing. Do you have the counterwieghts cut off the crank, and if you do, how are you balancing the rotating assmbly? thanks for your help.

b4racing
Dirt Forum Champ
Total posts: 626
posted September 02, 2003 03:09 PM  
yes that is what I am doing. BObby

Trapper
Dirt Full Roller

Total posts: 64
posted September 02, 2003 05:24 PM  
I will definately be balancing the crank but am very limited on what I can do with the fly wheel. It has to be a min. of 5/8" thick. Technically the crank is to remain stock but gonna balance it anyways if it will prevent future failures.

Am I procedurely correct in saying that you preassemble all your rods and pistons and weigh them to determine the lightest assembly and grind the surface on the end of the rod to make them all weigh the same or is it more to it than that. I hope it is that simple where I can do it myself and try to save a few $$$. Thanks for all the advice and balancing seems to be the answer but I have never balanced one before and trying to learn.

BTW the machine shop quoted me $160 to balance the crank, is this reasonable ???

Thanks
TRAP

b4racing
Dirt Forum Champ
Total posts: 626
posted September 02, 2003 05:44 PM  
I have it done by a machine shop and my whole assembly cost I think 100 to do. I had a quote of 200 for the crank if they lightened it and then balanced it. on the flywheel they do not have to grind it flat they can drill them to balance then you do not loose out on your rule.

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