The saga continues! "New" engine blew up!

[Burg Boxster]

Originally Posted by seningen

Well I hope Jake is willing to spread the word.

seningen,
I think you already have your answer...

Originally Posted by Jake Raby

...I may know what has happened here and I am not willing to discuss it online.

I'm sure this, as you called it, 'box of marbles' is a particularly sensitive subject since it has the "engine saving IMS retrofit/upgrade" . . .

[AndyA6]

This is getting interesting!

[mikefocke]

known failure modes even according to its proponents. This statement is like commenting that the radiator cap didn't save the engine.

I'll be interested in the symptoms of what happened and then we can all theorize on what went wrong and perhaps learn something from someone else's sad experience.

The car was just worked on and had more than the IMSR done to it IIRC.

[seningen]

Originally Posted by Burg Boxster

seningen,
I think you already have your answer...



I'm sure this, as you called it, 'box of marbles' is a particularly sensitive subject since it has the "engine saving IMS retrofit/upgrade" . . .

No Box of marbles is not IMS --

When the IMS goes -- you most likely have bent valves.

Things can get worse -- but on my limited watch -- this is what I have seen.

You can also loose one of the chains, but I wouldn't expect that to be sudden.

Box of marbles -- I'm talking chunks of metal in the oil pan from
connecting rods, cracked pistons, cylinder wall debris.

I missed the original discussion.....

What year/model is the new engine. What is the history of this engine and
what if any rebuild info do we have? --- Ok I found the old thread --- an 02 S
that appears to have spun a bearing or some such and sent the connecting rod
through the block (ouch!)

But I can related -- we just lost #2 rod bearing on our 924S LeMons/Chumps
car. Time for some rebuild and oil mods!

Without tearing it down your new engine -- it's only speculation.

But if its something I haven't seen -- I'd sure like to know about it.
I can't prevent everything -- but I'd sure like to try with in a reasonable budget :-)

Mike

[insite]

engine was an '02S with unknown mileage. it had an LN IMS and a 2qt accusump system.

it has been used on track in the past. the engine was pulled from its original car following an AOS failure that was misdiagnosed as a blown motor.

[thstone]

Most likely something was missed in re-assembly and came apart as soon as the engine was run up to speed.

[seningen]

Originally Posted by thstone

Most likely something was missed in re-assembly and came apart as soon as the engine was run up to speed.

Was the engine disassembled after the AOS misdiagnosis or just the AOS fixed?

Maybe there was a bent con rod (or stressed con rod, bolts, cap, nuts?) from
a hydrolock situation.

Not evident when running at moderate RPMs.

Mike