markrinker
New Member
The way I understand it is, you want to match fuel delivery with RPM's, otherwise you're dumping too little or too much fuel per ignition. Dumping too much fuel into a cylinder will not ignite it all, wash the oil off the liner, etc... So prop tuning and making sure the fuel rack is all calibrated will probably yield good results. Just getting everything to factory spec will get you a 60% increase in economy from the numbers you threw out, no need for fancy doodads or super blowers or boostermabobs. Much better than the 5% you're looking for.
The biggest problem with too much fuel is high EGTs. Unburned fuel is the black smoke seen in the exhaust, and means the turbos are not supplying enough oxygen in the charge air to burn the fuel available based on the current ignition timing (amount, duration of fuel injected).
There is no rich or lean in diesels - just fuel, air, cylinder pressure, and timing of the injection event.
CAT has tuned for 2800rpm @ WOT on the 3126. Props are matched to hulls and anticipated loads, like selecting drive tires on a truck. The same hull could be propelled with a target RPM of 2600 or 3000. Longevity would be a factor - what becomes the weakest link?
Fun stuff. I bet there is more performance and efficiency in there...just waiting to get out. :smt001