Engine damage due to incorrect wiring? EMU Black

hello!

This is about an air-cooled 6-cylinder boxer.

The car has very strange engine damage. All pistons on the left bank (1-2-3) are broken. Nothing at all can be seen on the right bank.

i noticed the following on the wiring harness:

- the outputs of the injectors are only wired with 22AWG

- only one powerground was connected to the control unit!

- only one 16AWG cable goes from the 12 Volts supply relay to all injectors and ignition coils (6 injectors and 2 ignition coils)

Unfortunately there are no data logs for the period in which the damage occurred....

Do you think there is a connection here? By the way, the control unit is not damaged.

I just don't understand why only one bank has damage while the other bank looks completely fine... if the engine had knocked, you would be able to see it on all cylinders, right?

Thank you very much for your help!

Sven,

Nothing you've said thus far sounds like a certain cause of an issue.

Did the engine have an intake or exhaust leak on a single bank? That could cause one bank to run significantly different AFR than the other.

Is there anything asymmetric about the air cooling or oiling of this particular engine? Is it perhaps located in a manner where one side gets more airflow than the other?

It partially depends on what you mean by "broken", but if it's just one bank it might be something relatively simple, like a camshaft stuck fully advanced or retarded, if applicable, or incorrectly timed, with the potential to mess up the AFR's because the airflow isn't matching the fuel entering the cylinders?

What differences were there between the banks' sparkplugs and bores?

If they have per bank throttles, that's another potential cause of one bank running lean.

Sry for my late reply...

Here is a picture of one piston and it's spark plug.

Unfortunately, no intake or exhaust leak.

No adjustable Camshafts, one Throttle Body for both banks. Fueling is set to Squirt twice per cycle (EMU Black). So there should be enough fuel.

Like i said, i have no logs from the race the failure happend...

Last time i had the car on the dyno was November last year. Fueling was spot on. Lambda 0.87 and 75% injector DC.

Could bad fuel be a thing? I'm not sure what fuel my customer got on that racetrack and the car has no knock control. But if it was bad fuel shouldn't be both banks damaged?

Thank you very much for your help! i really appreciate it

I find people have inadequate filtering more often than not on modified cars, so were the injectors flow tested? Maybe there's debris in one bank, or more debris in one bank vs the other.