Piet

He has to do his exams first before he is allowed to continue with his engine

As was to be expected....

Very nice C30, especially with the new wheels. I'am pretty sure it won't take long before it's power exceeds 500whp though

Like gdog said: If the bores were too tight you would see scuffing/seize marks on the skirts "crack starting. all the pistons have marking on the inside of the head near where the oil passages are"........ Didn't notice this before but maybe this would explain everything? While the pistons have been pushed upwards in the cilinder the H-rods, beeing at an angle came in contact with the inner side of the skirt, pushing it against the cilinder wall and eventually made it crack..... Or are these markings too high up in the pistons for that?

Also relevant: http://engineproblem.com.au/engine_problem/details/2.html Especially the sentence with the term "faulty piston design in it"

If this is caused by detonation then there should be damage / heavilly pitting visible on the topsurface of the pistons. I'am not so sure about the detonation theory. It's a real shame this has happened though, but I can understand that you're done with it now. Curious how you are going to modify/ upgrade your future C30, cannot imagine you will leave it standard for long.

Of course you're going to fix it A C30, what fun is that ....you can't even tune them yourself I would lift the head, drop the oil pan, get piston #3 out and decide from there.

Why going stand alone? What would be so much better with it?

I dis let them fire for a while at 30 Hz

Yes, I agree. Bench testing and running them in a car are different situations after all. The best charges time om the bench doesn't necessarily have to be the best charge time while using them in the car.

To avoid misunderstandings...:) These are charge times not dwell times. Dwell times have to calculated out off the charge times for each RPM to get the values for the dwell table.

This is what I measured on the LS9 coils: http://www.meditekst.nl/cop_hussein.mov (14 volt - 3 ms) at 10 volt : 4.5 ms at 11 volt: 4 ms at 11.5 volt 3.7 ms at 12 volt: 3.5 ms at 12.5 volt : 3.3 ms at 13 volt: 3.2 ms at 14 volt 3.0 ms These charge times are shorter then the charge times of the LS2 coils

That's odd ....at 13.5 volt I measured a charge time of 4.3 ms with these LS2 coil. 3.5 ms seems a bit low, they will not be fully charged. At 14 volt and 4 ms charge time: http://www.meditekst.nl/cop/LS2_14v_4ms.wmv Volt - ms 6 - 12,5 8 - 8,7 10 - 6.8 11 - 6 11,5 - 5,6 12 - 5,3 12,5 - 4,9 13 - 4,6 13,5 - 4,3 14 - 4

Just disable (set to zero) everything under "Diagnostic disables" in tunerpro except for "diagnostics replacement value: intake air temperature" set that one to 20 or something like that. The software AC mod works on every M4.4 by the way