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Old 10-18-2010, 11:21 AM   #30
ralphyost
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City: Cape Coral FL
Vessel Name: Say GoodBye
Vessel Model: 21 Mako
Join Date: Oct 2007
Posts: 261
RE: How Many Ford Lehmans are there?

Willy
Yeah I am probably getting somewhat higher than my calc. especially because I neglected to mention that my genset pulls diesel from it also. I dont bother seperating genset fuel consumption since this summer only used genset for 40 hours or so. Its negligible.

However, I can tell you that the Lehman 120 uses VERY LITTLE fuel at idle speeds.* You can prove it by starting cold then running at idle only and watching the temp gauge. It will hardly warm up at low idle, even at 1000 rpms. Takes forever.
Thats because there is not enough fuel burn in the cylinders to generate the heat required to get the engine up to operating temps.

Bob Smith advocates start up, throw off the lines and leave the dock. Do not wait for warm up. Run at 1500 or so until you see the temp start coming up then move on up to 1800 RMP.

So the actual fuel burn is an actual estimate.

R.
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