The saga continues! "New" engine blew up! - 986 Forum - The Community for Porsche Boxster & Cayman Owners

insite · 03-07-2011, 06:34 AM

Quote:

Originally Posted by Byron in Atlanta

....pressed the clutch for the hairpin, down shifted to 2nd and the dashboard lit up like a Christmas tree.....

any chance of a type II over-rev here?

Gilles · 03-07-2011, 10:50 AM

Quote:

Originally Posted by insite

any chance of a type II over-rev here?

+ 1...

Also the crank seems to be in one piece because the engine does run... unfortunately, with a clanking noise

I am sorry to hear this

.

insite · 03-07-2011, 10:51 AM

my guess is that a rod broke & the motor just hasn't siezed yet.

wonder if we can piece together one working motor from the two dead ones in your garage? ;-)

Jake Raby · 03-07-2011, 11:14 AM

I believe that I may know what has happened here and I am not willing to discuss it online. We have recently uncovered some revealing information that could be applicable to your situation.

I definitely want to see this engine.

The LWFW is more than likely not a problem, that takes time to occur with these engines generally. Like I said, I believe I know what happened.

insite · 03-07-2011, 11:23 AM

Quote:

Originally Posted by The Radium King

sounds like it stalled when the clutch was depressed - ecu not able to react to the rapid rpm change associated with the lighter flywheel. so, what happens when you take a m96 from high rpm to off in a corner?

nothing, really. done it thousands of times. react how, out of curiosity?

The Radium King · 03-07-2011, 11:37 AM

i've read (ie, no ral expereince) that sometimes vehicles will stall with a lwfw, as the ecu anticipates a certain lag in rpm drop when the clutch is depressed. they way i read the initial description, it read like the stall happened when the clutch was depressed, not re-engaged ...

insite · 03-07-2011, 11:41 AM

Quote:

Originally Posted by The Radium King

i've read (ie, no ral expereince) that sometimes vehicles will stall with a lwfw, as the ecu anticipates a certain lag in rpm drop when the clutch is depressed. they way i read the initial description, it read like the stall happened when the clutch was depressed, not re-engaged ...

ah; i hear what you're saying now. the revs do drop very fast. in the older cars, if the idle valve is the least bit sticky, it won't always react in time to keep the engine from stalling. i think the e-gas cars don't have this problem so much as the early ones. byron's was e-gas.

i was working under the assumption that the engine died after the downshift was completed. byron?