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tri6kata

Why it is a conrod killer, can you help?

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Hi guys, I am new here and was provided with a task to deal with a problem in a map that has killed a few engines EJ20 and EJ25. Every time the problem was a broken connecting rod and barely achieved setup potential. Haven't worked with G4 till now, only stock ECU and its hard for me to compare the maps and make any conclusions. If anybody can check the values of advance, timing and fueling, is the ref limiter ok to be ign cut and etc. or just give me a tip to find the problem. Thank you in advance :)

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Are the failed conrods showing a tensile or compression type failure?  Are the big-end bearings and pistons from un-broken cylinders showing any signs of damage?

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A rev limit is active there is no combustion so that removes all compressive load from the connecting rod so I dont think it could be related to that. 

When an engine is sitting on a limiter for an extended period of time, the irregular firing events does create more torsional vibration in the crankshaft and this is well known to shorten crankshaft life - but I cant see how this could place any more stress on the connecting rod.  The "adaptive" limiter mode is designed to minimise the extra crankshaft stress by randomizing the cut pattern to reduce harmonics.

I think if it were detonation related you would see effects on the piston, spark plugs and rod bearings first.

So, im my opinion if you are seeing compression related failures on the conrods and there are no signs of detonation then it would suggest you are exceeding the torque capability of the connecting rod.

 

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