Posted by David G on May 08, 2016 at 19:28:59 from (63.152.70.156):
I got started on the tuning today.
I adjusted the opening time delay on the fuel injectors to what they should be.
I cranked the timing up to 30 degrees from 26 at full RPM, with 18 up from 12 degrees @ 600 RPM, that really seemed to light it up, I still have to decrease these values at full load to simulate vacuum advance. I would still appreciate if someone could get me the advance tables from a Farmall M or MH44, they should be close.
I had the AFR richened to 13.5 at idle to 12.5 at full load, I cranked that back to 14.5 at idle and 13.1 at full load. I have to run the tractor at each RPM and load range to let the autotune correct the fuel values. I was able to do some today, but found a sawtooth throttle can jump 2 -3 hundred RPM between teeth. I ended up slowly moving the throttle between the teeth, it was a real pain. I was not able to adjust the dyno on each range by myself. It would be super easy to tune one of these with electronic throttle and dyno control. I would run a program that set the RPM, then ran the Dyno up for each RPM range and let the autotune do its job.
The tractor puffs a little bit of black smoke when you advance the throttle quickly, I may back the throttle enrichment ramp down a little.
The tractor put out full HP after these changes a lot easier than it did last time, I think the timing was a little slow and the mixture too rich.
There is no blow by when at idle or partial load, but a pretty constant blow by when the engine is run at full HP for several minutes, there is only about a dozen hours on the rebuild.
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