15-05-2014, 10:51 AM
Yeah, be mighty careful with the pressure regulator, if you accidentally tap the top of it, it'll completely cock the advance curve - i.e. it'll sound like a transit van at 1400rpm.
TDis will not have this issue since they have a solenoid valve controlling the advance curve, the pressure regulator is knocked in the entire way...
What nominous does describe is the entire problem with running veg oil in the first place, it's massively exacerbated by us using VE pumps that use spring and regulator advance on the timing piston, rather than the TDis solenoid system. Soon as the pump begins to drop internal pressure due to sucking veg, you INSTANTLY drop timing, it's a finely balanced system that if there's any suction going on, it'll instantly retard the pump back to base timing.
As far as I can see, soon as you start running veg - bam you've probably lost 5* of timing midrange, by the time you're past 3800rpm, it's struggling so bad to get fuel, the timing is right back at stock position.
TDis will not have this issue since they have a solenoid valve controlling the advance curve, the pressure regulator is knocked in the entire way...
What nominous does describe is the entire problem with running veg oil in the first place, it's massively exacerbated by us using VE pumps that use spring and regulator advance on the timing piston, rather than the TDis solenoid system. Soon as the pump begins to drop internal pressure due to sucking veg, you INSTANTLY drop timing, it's a finely balanced system that if there's any suction going on, it'll instantly retard the pump back to base timing.
As far as I can see, soon as you start running veg - bam you've probably lost 5* of timing midrange, by the time you're past 3800rpm, it's struggling so bad to get fuel, the timing is right back at stock position.
