JB Weld won’t fix this

[JohnCh]

Not se7en-related, but I thought some of you might be interested in how I spent my Saturday. A few of us got together to help a friend pull the blown engine from his Porsche 944 S2 dedicated track car. The engine was (operative word here) a heavily modified 968 unit that suffered catastrophic failure at 6000rpm on a thankfully slow part of the track. As we removed various pieces to aid removal from the engine bay, the true extent of the damage began to make itself known. The Carillo rod in #4 had literally sawed the block and wet sleeve in two! In fact with the head and remains of the sump removed, the two pieces of the block rotated in different directions around the crank! The damage was so extensive that even the custom header was beaten into oblivion by the rod and shrapnel.

 

A closer look showed the big end of the rod was fine, with no damage to the bearing, but the lower half of the J&E piston was missing and the small end of the rod was beaten flat and bent like a pretzel. Best guess at this stage is piston failure. Apart from two slightly bent valves, the head appears okay and the lightened, knife-edge crank is spinning freely, so there is hope there as well. The rod, piston, block, sump, header, and oil filler/breather assembly though are kaput.

 

http://john15.web.officelive.com/Documents/968-1.jpg

 

 

 

http://john15.web.officelive.com/Documents/968-3.jpg

 

http://john15.web.officelive.com/Documents/968-4.jpg

 

http://john15.web.officelive.com/Documents/968-5.jpg

-John

[7evin]

Wow, That is awful.

[slngsht]

amazing

[JohnCh]

Not sure I'll soon forget the sight of the engine on the hoist with 8 head studs facing up and 2 facing down. Oh well, at least we've learned that Carillo builds a really tough rod!

 

-John

[gjslutz]

I had a rod break in an over boosted (1.5 BAR) 911 turbo at night at max RPMs in 4th. As it was a cool fall night, I can tell you where all the oil smoke went. That rod also cut the engine apart. I had about 7 hours of run time on the engine at that time.

Gary

[BruceBowker]

Are you sure JB Weld won't fix that? It is pretty good stuff. Maybe 1 or 2 gallons?

[DeanG]

At least the rod will make a great conversation piece/paperweight

[sparecr]

Pistons and rods are curious little buggers, always trying to explore the outside world. Every now and then they make it.

[David C]

I've seen ventiliated blocks before from rod failure but that - ouch.

Must have made a heck of a noise.

Probably more than my Mom's lawnmower was making running with a broken crankshaft (she's not terribly mechanically inclined).

[7evin]

I had a rod break in an over boosted (1.5 BAR) 911 turbo at night at max RPMs in 4th. As it was a cool fall night, I can tell you where all the oil smoke went. That rod also cut the engine apart. I had about 7 hours of run time on the engine at that time.

Gary

 

Wow, Were you on a track or just on some lonesome road?

 

I bet from the back it was quite a show.