Quote:
Originally Posted by Dick Richy
LOL @ "Band-aid" comment. Sounds like you're an expert. How many FI kits have you made? Where are the facts that say meth caused this failure? Oh ya there is none... There are kits out there that have been running meth without fail for a long time and setting records not sure what you're talking about. The same kit is also offered without meth and runs just as well. Meth will not cause you to drop a rod. That seems to be a seized motor caused by bearing failure. If it was tuning or meth or any of that the piston would be damaged before the rod would be..
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Well sir I deal with 3500BHP FI engines on a daily basis..... it is my job. If you can't control Intake air temperatures and Exhaust Gas temperatures with a good intercooler/aftercooler and proper tuning it is not a good application for a street driven car.
Methanol is great for a race application but not for a street driven application. There is just too many variables to contend with...... have you ever seen an OEM turbocharged engine running methanol? When reliability is a big consideration (as I think it should be for any kit that is being produced for the E90/92/93 M3) Methanol injection is just not Ideal.
I am betting it is a 95% chance that this failed rod was do to severe Detenation near BDC. The combustion forces and cylinder pressures are huge when detenation occurs near BDC. The problem is that at BDC there is so much cylinder volume at this point in the stroke for the combustion event to expand. Couple this with the fact that both valves are closed and the piston has little or no room to travel to react to the pressures created by this explosion. In this instance the weakest link has to give...... The Rod. Shy of lifting the head off of the engine the rod is the only part that will give to these kind of forces.
Just visualize this: The intake valve has just closed and the cylinder is filled with a high temperature mixture of pressurized Fuel/Air/Methanol. The high temperatures caused by running boost are enough for detenation to occur. The mixture ignites near BDC and the combustion is so violent (two-three times a normal combustion event near TDC) the rod has no choice but to bend.
You see with methanol all it takes is a split second hiccup in the methanol delivery or one tank of off spec fuel and you have a ticking time bomb. Methanol is good but not for a daily driven street car.