Broke connecting rod?
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Broke connecting rod?
I am in need of some help guys. I have had a rod failure an not sure why. Will post pics shortly
All parts new with about 40 passes. Engine has enderle hat/victor ram set up. 0 1/2 Ron’s pump on alcohol. Engine ran clean but not 100 % sure if tune up was perfect.
This guy has had a bad run and I am trying to find a problem. At the end of last year he had an aftermarket block sbc that had the main webbing broke in it (engine had lots of passes around 650-675 hp range). He put a spare engine in while we were building his new engine and it broke a rod after about 4 passs. I had nothing to do with these engines but new one with broke rod is all my build from scratch.
I will put the brand names out there if y’all want them. I am in no way putting a particular part(manufacturer) at fault. I just want to prevent another failure
Rod bearing good and wrist pin not seized up
All parts new with about 40 passes. Engine has enderle hat/victor ram set up. 0 1/2 Ron’s pump on alcohol. Engine ran clean but not 100 % sure if tune up was perfect.
This guy has had a bad run and I am trying to find a problem. At the end of last year he had an aftermarket block sbc that had the main webbing broke in it (engine had lots of passes around 650-675 hp range). He put a spare engine in while we were building his new engine and it broke a rod after about 4 passs. I had nothing to do with these engines but new one with broke rod is all my build from scratch.
I will put the brand names out there if y’all want them. I am in no way putting a particular part(manufacturer) at fault. I just want to prevent another failure
Rod bearing good and wrist pin not seized up
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Re: Broke connecting rod?
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Re: Broke connecting rod?
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Re: Broke connecting rod?
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Re: Broke connecting rod?
Lance Flake...with NO signs of blueing or seizing ....wow, it appears as if the rod just flat failed. American (or) off shore forgings ? Mark H.
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Re: Broke connecting rod?
How high is it revving ?
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Re: Broke connecting rod?
Can you post a complete layout like this?
It may give guys a better idea if hydroliced and compressed the rod causing the failure.
Also a shot of the top of the piston.
SAMPLE PICTURE.
It may give guys a better idea if hydroliced and compressed the rod causing the failure.
Also a shot of the top of the piston.
SAMPLE PICTURE.
Please Note!
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THE ABOVE POST IN NO WAY REFLECTS THE VIEWS OF SPEED TALK OR IT'S MEMBERS AND SHOULD BE VIEWED AS ENTERTAINMENT ONLY...Thanks, The Management!
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Re: Broke connecting rod?
A pic of the upper bearing would tell more of the story.
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Re: Broke connecting rod?
I will piece the rod together as best I can tomorrow evening
Something foreign did hit the piston but I don’t think it was enough to break the rod. Will get pic.
3.75 stroke 7200 rpm
Was not a cheap rod! Lol
Something foreign did hit the piston but I don’t think it was enough to break the rod. Will get pic.
3.75 stroke 7200 rpm
Was not a cheap rod! Lol
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Re: Broke connecting rod?
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Re: Broke connecting rod?
What puzzles me is the 3 catastrophic failures in such a short time with 3 different build 3 different builders. Same fuel system and ignition system. 6 al2 Msd box
First engine ran for a long time. Lots of passes probably 1000 or so. The guy had fellow racer freshen it and it broke the block within that season
First engine ran for a long time. Lots of passes probably 1000 or so. The guy had fellow racer freshen it and it broke the block within that season
Re: Broke connecting rod?
Face-on pix of both surfaces of the break would be very useful. Pix/description of the chamber appearance too. Open headers I presume, so no chanced of finding a stray part that might have caused to piston damage?
I once found an un-curled exhaust seat insert in the muffler before we tore down the engine to check out the dead cylinder.
I once found an un-curled exhaust seat insert in the muffler before we tore down the engine to check out the dead cylinder.
Felix, qui potuit rerum cognscere causas.
Happy is he who can discover the cause of things.
Happy is he who can discover the cause of things.
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