Hello. Update on some of the things I have learned in the last few weeks of my testing. First off I built a pop off tester, second I purchased a dynamic timing light (ouch). There are several things that can change the timing of the injection in relationship to crank timing that greatly effect how well the engine can run on other fuels as well as diesel. Obviously the IP setting and the injector pop off pressure(low pressure=early timing). The viscosity of the fuel can change timing. One thing that really surprised me is the major effect that removing the spring in the CSD as Jerry highly recommends. Jerry has said that timing differed from year to year, this is what I found on my 1982 N/A. I used the probe and the timing light to confirm readings.
Pump timing:
RPM=750's, timing 15.5? BTDC (matched factory timing of 15?) on diesel
RPM=2800's, timing retarded to avg. of 11.4?BTDC on diesel,,,even more with blended fuel(with spring in CSD) this timing retard seams to match some of the info I have about emission settings of the time...???
Timing at the injector:
RPM=750's timing=8.6? BTDC
RPM=2800's timing= 7.5? BTDC avg.
Now when I removed the spring in the CSD, man did things start improving :)))
Pump timing:
RPM=750's timing 15.4? BTDC
RPM=2800's timing 22.7? BTDC avg. ( I have read that the VE IP can have a 8? advance)
Now another big surprise, when I checked the timing at the injector, I did not get the full 7.3? advance.......only about half of that......
So the final setting I used is about (12?BTDC at 2800's injector timing)which left me at (16.4? at 750 RPM pump timing). It cranks better than it ever has and runs pretty good on diesel. This setting on diesel seams to have good low end torque and a little down on high end horse power. I set it there thinking more about running my blend than diesel as my blend gave me improvements in high end horse power or it seamed.
I believe that I have come up with a way better tell how your engine is responding to any type fuel change and just maybe be able to tell if your engine(compression, timing, injector pressure, etc.) can safely use which ever fuel you run without coking issues. The results of the tests so far are amazing. I posted the why's and how's on the
http://biodiesel.infopop.cc/groupee/forums/a/tpc/f/159605551/m/9221066701I welcome your comments, corrections and suggestions.
crossbones
