boosted bseries 04

Hi, Im still purplexed about my blown motor.

its a boosted b-series, 81mm bore, 9:1 compression. your basic turbo setup tuned on pump gas.


the pistons are shot, plugs look like they have white specs all over them.

Im still wondering exactly what happend? My first indication was that the motor went lean, detonated, and damage was done.

what does everyone have to say about the timing maps, do they look too aggressive, or is that ok? did the motor detonate because it was too lean, or because of the ignition timing. Im looking for answers so I dont have to fork out money to rebuild.

I sent the injectors out to be tested, I hope to have the results back shortly. but they didnt have many miles on them.

attached are the pics:

http://img82.exs.cx/img82/8449/pic175.jpg
http://img72.exs.cx/img72/7218/61-fuel.jpg
http://img90.exs.cx/img90/7917/c5-ign.jpg
http://img89.exs.cx/img89/3510/e8-log1.jpg

beepy

Hmm. Were't you the guy blaming your tuner for blowing the engine?

In any case, compare your timing map:

http://img90.exs.cx/img90/7917/c5-ign.jpg

To the "hack" timing map:



Yours is about 6° less advanced at the high end. Seems fairly safe.

I would say from lack of any other evidence, that the engine detonated from going excessively lean, for any number of reasons. Perhaps an injector was bad. Perhaps an injector pigtail rattled loose. (Has happened to me twice) Perhaps it was the tuner's fault. (Though I am doubtful of that)