Posted by David G on January 26, 2018 at 07:12:31 from (204.29.138.33):
Well, it is still not running correctly.
The original turbo was re-installed after the re-designed turbo was found to be too large, turns out the old turbo is too large in cold weather, they are upsizing the waste gate, as I suggested 4 months ago, to accommodate the bigger turbo under "all" circumstances. The leaner burning engine is producing a lot more exhaust gas than the engine did before, and looking from an exhaust volume perspective a lot like a Diesel. I think they will install the new waste gate in the upcoming month. The old waste gate was 4", the new one will be 5" and the piping is being upsized.
They installed a pre-chamber to make it burn leaner. They found out the pre-chamber was too long and there were rich pockets inside it causing detonation. They shortened the pre-chamber and that seemed to get rid of the detonation issue. They also changed the position of the pre-chamber, it was mounted horizontal, the new mounting is at a 45 degree pointing down. These two changes made the flame front appear to be about 2 degrees under no load and 4 degrees quicker than the old one, thus the engine started pre-igniting. They have now retarded the fuel timing and it is not not pre-igniting.
More testing will be done once the new waste gate and corrected turbo are installed.
This was a 2 million dollar fixed bid conversion, I think they are about a million over, glad I did not bid that.
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