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petert

[Race_Prep] Never Ending Race Car Build

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petert

Now right on the limit of the bar mount. Probably time to move on to a custom bar/front.

bumper mount.JPG

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petert

Threw a rod today.

IMG_0386.JPG

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Andy

Oh. That is a real disappointment . Full engine rebuild required with replacement block and heaven knows what else. However, you must have been trying hard !

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petert

Well that's the strange thing. It was just went bang changing from 2-3 at 7500. My son was driving, just 8 laps in, out of a 137 lap endurance race. Suffice to say I didn't get a turn.

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petert

Sorry, it was 3-4. Looks like he got a bit flustered trying to shut it down.

 

 

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Andy

See what you mean. Good video clip though. The engine sounded great right up until it popped a rod though its crankcase . I suppose that is the thing about some modes of failure. A component goes through a certain number of stress cycles and then fails on the next cycle , even though the stress is no higher than the previous x thousand of them . Still a complete bummer though. 

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wicked

Always crap to see a good block popping rods... feel sorry for you.

Any clue on the cause? It popped on straight and not in a left corner. Looks like the rod bolt snapped?

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mmt

So sorry to hear Thatcher bad noise. Sounded really healthy before. 7500 rum for 130 Lars must be tough though. Some good lines your son makes. 

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petert

Boom! I think the engine gave birth to an alien. If it's only got two bent valves I'll be extremely lucky.

bent valves.jpg

damaged block 2.jpg

damaged block.jpg

pace sump 2.jpg

pace sump.jpg

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JeffR

Bloody hell. Some serious damage there.

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petert

Autopsy complete. I suspect the cap from conrod #3 broke in two, as there is only part of it remaining. The two rod bolts snapped, remains of which are still in the main part of the rod. The remains of the two bolts and large part of the cap are missing. The engine kept rotating, maintaining oil pressure, until John shut it down. The crankshaft is in surprisingly good condition and should survive a regrind, thank goodness. Piston #3 is cracked (circled) and has substantial bruising (circled) where it has been smacking into the head. Mains bearings and remaining three rod bearings were perfect.

 

What do I build next?

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wicked
26 minutes ago, petert said:

 

What do I build next?

 

audi4cylindercoffeetable-e1499459598981.

 

 

Rebuild what you had if you have spare parts or maybe move on to EW10J4S?

 

 

 

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welshpug

why did the cap and bolts break though?   seized / spun bearing?

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