Really need some
advice on this one. Port
engine has just been through it's 3rd
rebuild. The original problem occured at 3,000 rpms when the
engine shut down and basically cooked a piston. After rebuilding it with new pistons and new injectors it did the same thing again.
The next
rebuild included new
injector pump and valves. Now it is running fine but smokes beginning at about 2,000 rpms and progressively gets worse and the smoke gets darker as the rpms increase. It will run 3000 in fwd
gear but dumps unburned
fuel in the
exhaust and thick black smoke.
There are 13 hrs on it since the last rebuild. There is no blow by and the engine runs between 170 -188 deg until you bring the rpms up above 2500 then it creeps up past 195 at which point I back off the throttle.
Acts like it is overloaded but the
installation is on a Cat so there is an identical engine and prop on starb. Both engines run about the same rpm's at the same throttle positions. The Starb (good) engine will run 3000
RPM with no smoke.
One final clue, the smoking engine idles fast (about 1,000) and has done so since the
injector pump was changed.
Could this be injector
pump timing?
Pat? Anybody? I am stumped.
Thanks,
JJ