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p.mole1
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Last year I did a couple of track days with no Apollo but I did have an Accusump fitted and it seemed to work,oil pressure never dropped below 35 psi. However I think the problem is not oil pressure it's fact the bearings are probably being supplied with froth and this causes damage to the white metal. At the begining of this year I managed to locate and fit an Apollo but the damage was probably already done?. This combined with 195 Bhp this year finished them off

sforshaw
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Sorry to hear about your woes Phil, not good :(

If there's oil starvation no.1 & 2 big ends are the usual ones suffering the most damage ... I've been there done that made the video etc, except mine was at Oulton and I got away with just a new crank and subsequent rebuild. I feel your pain though, it's not nice.

But .... and I could be wrong ,.. I'm surprised that you managed to break a rod and mangle the piston if the big end bearing was the start of the problem, the K-Series bottom end is pretty tough even in standard form and oil starvation at no.2 usually causes massive knocking and a very noticeable loss of oil pressure, but the rest of the engine will hold together. I think getting the head off is going to show whether it might have been something higher up that started the destruction, maybe a valve that went first.

I know it's easy to say, but at this stage just relax, take your time and work it all out, there's nothing that can't be repaired, you just might want to take it slow.

Stu.

The register for all numbered limited-edition Caterhams ....... www.thecaterhamregister.net ...... www.instagram.com/thecaterhamregister

p.mole1
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Thanks it's nothing that can't be fixed,at least the bottom end didn't cost me too much, I'm going to take my time to find out what has caused it and will inspect all of the bearings, I hope someone caught on video as it was spectacular, unfortunately I didn't have my camera on

p.mole1
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Cylinder head seems ok apart from 2 bent exhaust valves, but if look at the piston you can see an imprint of the small cutout in the combustion chamber! The combustion chamber is unmarked apart from some tiny pits it squish area so hopefully it will be ok

TomB
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That’s one impressively broken engine! Stronger 160 pistons lunched. Have you got to the bottom of the cause yet? 

revilla
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In your pictures the exhaust valves have clearly taken a clout, but the piston has fractured across the pockets on the inlet side, not the exhaust side. Is there any sign of contact on the inlet valves? I'm just trying to imagine the sequence in which things failed. I'm wondering if the piston crown maybe fractured first. I'm sure I read somewhere that it was a weak point and a known failure mode fracturing across the valve pockets like that.

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

p.mole1
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Thanks you can see where the piston made contact with the exhaust valves, I should have the engine out tomorrow and will strip the bottom end. I still think it is a lubrication/oil starvation issue. The inlets seem fine and the valves show no contact marks. I will be rebuilding the bottom end with steel rods and forged pistons, but I need to make sure I have no lubrication issues.

Wrightpayne
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Arhhh but which steel rods - Max Speeding?

sforshaw
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What sort of power are you hoping to get, or put more simply, why do you think you need steel rods? If your problems are lubrication related you need to fix that first, before deciding on forged pistons / steel rods ... dry sump needed.

Stu.

 

The register for all numbered limited-edition Caterhams ....... www.thecaterhamregister.net ...... www.instagram.com/thecaterhamregister

rj
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The Chineese rods are as cheap as ordinary rods.

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