by RCCUMMINS89 » Wed Sep 11, 2013 9:14 am
Wanted to add an explanation of something for the "guest readers" and those reading this thread in the future.
To explain why injector tip has no relation to timing............but the affects can be the same.
The more the timing..............the further the piston is from the injector. The more likely it is to spray outside the bowl. Therefore, the shorter the injector...........the less the timing before it sprays outside the bowl. Thus it will act like there is more timing with a shorter injector tip.
However........the piston is still in the same spot (18 btdc, or whatever) regardless of how long or short the tip is. Therefore the compression ratio at the injection event is the same as well as the burn time. Therefore it has no bearing on the timing itself.
The above leads to the injection tip placement (short or long, washer thickness, etc....) only has an affect of (for the sake of argument) changing the piston to spray relation much in the same way spray angle does.
Therefore if an injector tip is short, or if one uses too thick of washers.....it will behave in the same way as a marine injector (155 angle vs 145 angle). This will cause idle haze, very responsive driving, but high smoke at lower rpms. The smoke will also have a tendency to be bluer.
89 RC on shortened 92 diesel frame - NV4500 w/dual disc/4.10s on 37s. - Self built pump, "hot screw", lots of timing, True high volume low pressure lift pump, 62fmw/68/.7gated, 77lpm SAC Inj., Studs/O-rings,- 423/1220 Mustang - 11/16/2013
http://www.TheHungryDiesel.com full line dealer, if you don't see it please ask.