Hornet
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| posted on 24/5/16 at 10:15 PM |
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Duratec Broken Con Rod
Hi after a request for more info in the wanted section.... see below
Was on a trackday on Monday when after only 12 laps my st150 (running 220bhp) decided to go pop. No warning with good oil pressure and good
temperatures with rev limit set to 7000rpm.
And another
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bi22le
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| posted on 24/5/16 at 10:34 PM |
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Ouch.
U have no idea about that but i would guess it to be mechanical seizure.
Can you get the piston out?
What is on the other side of the piston?
Pre det is terrible for rods, timing and CR all srnsible?
Track days ARE the best thing since sliced bread, until I get a supercharger that is!
Please read my ring story:
http://www.locostbuilders.co.uk/forum/13/viewthread.php?tid=139152&page=1
Me doing a sub 56sec lap around Brands Indy. I need a geo set up! http://www.youtube.com/watch?v=EHksfvIGB3I
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big-vee-twin
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| posted on 24/5/16 at 11:06 PM |
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Are they standard rods and pistons because they are only good for 200 hp?
Duratec Engine is fitted, MS2 Extra V3 is assembled and tested, engine running, car now built. IVA passed 26/02/2016
http://www.triangleltd.com
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madteg
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| posted on 24/5/16 at 11:19 PM |
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Time for forged rods i think
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neilp1
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| posted on 25/5/16 at 05:06 AM |
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quote:
Originally posted by big-vee-twin
Are they standard rods and pistons because they are only good for 200 hp?
I thought they were good for that on standard internals, but not 7000rpm.
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joneh
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| posted on 25/5/16 at 05:11 AM |
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I thought standard internals were OK up to around 200bhp. At least that's what I recall the Burton tuning guide suggests.
Hope you can recover it!
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Andy D
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| posted on 25/5/16 at 06:00 AM |
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Can't see on the pic, was the big end bearing OK?
Have you got the head off, any damage up there?
Bad luck mate. 
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britishtrident
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| posted on 25/5/16 at 07:24 AM |
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We tell you more if you post a picture of the bearing and the fracture surfaces.
But as there is no bluing around the crankshaft end visiable in the picture I would first be checking the facture surfaces for evidence of a fatigue
failre.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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FuryRebuild
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| posted on 25/5/16 at 08:24 AM |
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SBD recon 210 IIRC is the giddy limit on stock internals. However, I'm really gutted for you. You have my sympathy - it's a rotten thing
to happen.
When all you have is a hammer, everything around you is a nail.
www.furyrebuild.co.uk
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daviep
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| posted on 25/5/16 at 01:38 PM |
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Looks to me like the broken rod may just be collateral damage, the piston must have failed first or the little end of the rod would still be hanging
from the piston. Either piston seized and gudgeon pin was ripped out the piston or over revved and piston kept going at the top of the stroke.
Checking for damage on the big end bearing may give you a clue as to cause of failure depending on which side the damage is.
Is it possible you over revved it changing down?
Cheers
Davie
“A truly great library contains something in it to offend everyone.”
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