crossbones wrote:Hello Brian, did you clean and set your injectors?
Yes, and I set them a little higher (1600 psi) than you normally do because I'm using UCO (WVO) blended with diesel (about 30% VO to 70% diesel). I remember reading that Elsbett suggests increasing popoff pressure from 5-15 bar for VO, so 1600 psi is almost +7 bar from your recommended 1500 psi.
I should probably start a new thread about what's happening lately, but to make it short... I'm getting a pretty strong tick (sometimes it's a hard knock) after the engine is up to operating temp and the rpms are around 2000-2500. (I don't have a tach, so that's a guess-timate.) So, knowing that too much advance can cause excessive knock, I first tried retarding it a bit, but that didn't help the knocking at all and I lost a LOT of power. So, then I advanced it farther than it was to start with to counteract the retard-effect I caused by setting my injection pressure higher and running the VO blend. The power was restored, but the knock is the same.
I then drained about a quart of oil, added about a quart of kerosene and about 1.5 ounces of xylene to the crankcase and ran that for about 10 minutes. Then I drained the oil pan (drivers side jacked up) for about an hour. (There was some pretty nasty goo coming out at the end.) I changed the filter and filled 'er up with a decent CJ-4 (non synthetic) oil. I took it for a test drive and after it got good and hot, the knock wasn't quite as hard/loud, but it was still there. I thought maybe the goo might've been clogging (or at least slowing) the oil pump.
I'm not exactly sure, but what I'm hearing may be a sticking valve. That's why my interest was again piqued in the possibility of vanadium buildup.