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p.mole1
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K series let go

Has anyone ever thrown a rod on a K series? Yes it was me that left the huge oil trail at Anglesey. I have given it a quick once over and there is at least one hole in the block. Up until it failed I had 60psi oil pressure, I did hear some very light metalic noise ay very low throttle openings less than 5% at around 2500 to 4000 which I thought could be pinking but as soon as throttle was applied it disappeared. With hindsight it could have been the little end? Just as the noise started to increase and I was going back off it let go at 6000rpm in top at over 100mph. I think the bottom end a pile of scrap. I hoping my DVA VVC head is ok or it's game over.  

p.mole1
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I have a paid for a track day at Croft if anyone would like to make me an offer for it? With hindsight I should of waited till till Anglesey was out of the way!

p.mole1
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I have just pulled out the spark plugs and number 2 plug is soaked in oil, looking down the plug hole I was expecting carnage but all of the pistons are where they should be expected? The crown of number 2 is covered in oil but seems intact. There  is at least one hole in the block below number 2 piston. I'm going to hazard a guess that I've spun a bearing or a rod bolt has gone? Judging by the prodigious amounts of oil smoke pouring out the bonnet i must have holed a piston. How is possible to put a hole in an engine and all the pistons are still in the correct place. I'd like to thank the person that lent me the trolley jack so I could get my car on to the recovery truck and apologize for spoiling a track session. Looks like it's end of track days for me this year and possibly for good!

p.mole1
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I have had another quick look at the engine before I drown my sorrows! 2 more holes found in the crank ladder which has also cracked along with the block, I tried a screw driver down number 2 spark plug hole and it was coincidence that the piston was in the expected position as it moved down the bore with a horrendous scraping noise unattached to the crank. I'm assuming that would have hit the cylinder head with enough force to wreck it although I still seem to have a full set of inlet valves. I looks like all I'm going to be left with is a pair of camshafts and a set of tappets and a sump pan which seems to have survived.

revilla
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Hi Phil, really sorry to read this. From the pictures and description I would guess it's a big end failure, possibly rod bolt as you say. Looks like the crank has punched the floating end of the big end of a rod outwards through the side of the crankcase. Like you, I can't imagine there's much left of the bottom end but I wouldn't give up hope on the head until you've had a look. If the piston has remained intact you may be OK. I've seen an engine with two dropped valves resulting in a badly bent con rod where the resulting scarring of the head was only cosmetic. I think you need to just get the head off for a look and see what's what.

SV VVC 170 - 170.4 bhp @ 7100 rpm - 142.4 ft.lb. @ 4900 rpm

p.mole1
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Thanks, I'm going to drop the sump today just of curiosity to survey the damage. I should have the head off by Wednesday and then I'll decide what to do. I should end up with interesting paper weights.   

Tony Whitley
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Bugger Weeping

  Freestyle Caterham #1
Jonathan Kay
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Sorry to hear this.

Email sent.

Jonathan

p.mole1
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The fragments in the sump are the remains of the piston skirt! I traced the problem it's oil starvation number 2 bearing has spun in the rod as the rod is blued with the heat only piston crown is left in the bore. I was lucky the car didn't catch fire as all the oil was dumped onto the exhaust manifold.

Wrightpayne
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Was the car on standard oil system or was an Apollo added?

p.mole1
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The upper photo is what is left of the big end bearings, they are blue with the heat and all of the white metal has gone, also you can see the where the conrod has been getting hot! Ignore strange noises at you peril! If I had noticed a drop in oil pressure I would have done something about it but it was showing 60psi when it let go