MB 4 cyl engines with cast iron heads (OM 621, 615, 616) all run down the road at rpm between 4 and 5k. The mode of operation is pretty much floor it until you need to slow down or stop.
Modifying these engines for marine use has been done, but requires some engineering and manufacturing. At 10:58 AM 7/25/2008, you wrote: >I would personally be very interested in seeing how well that would >work. I currently have a couple of aluminum >boats with 2 stroke outboard motors. I would like to get an inboard >outboard but have been shying away from the >larger engines due to fuel costs. There are 120 to 140 horse 4 >cylinder versions out there and I wonder how well a >MB diesel would handle the boat if used as a replacement. I am >guessing the engine would be heavier and obviously a >240D does not put out similar horsepower but diesels have good >torque and I wonder if that would help to offset the >loss of HP. Unfortunately, I don't know a whole lot about the >gearing etc of the existing setups. I am assuming >that the gas motor would run something like 4 to 5K rpm at or close >to full throttle. I am assuming the diesel >would not be happy at that rpm so one would have to regear in some >manner to keep the rpm of the prop in the range >it expects. Lots of these boats are capable of pretty good speed on >the water. I don't really care about going all >that fast. It has to get on plane but 20 mph would be fine instead of 40 mph. > >Would love to hear from anyone with direct experience and or good >insight. I'm not an engineer and I may be way off >on some of my thoughts on this. > >One advantage would of course be reduced concern about fuel vapour >and the possibility of explosion and fire. Gas >inboards some times do that. > >Randy > >-----Original Message----- >From: [EMAIL PROTECTED] >[mailto:[EMAIL PROTECTED] Behalf Of Hendrik & Fay >Sent: Thursday, July 24, 2008 5:53 PM >To: Mercedes Discussion List >Subject: Re: [MBZ] OT: Boats > > >One would have thought that by now the Diesel crowd would have suggested >an OM something would be ideal for a boat. Just don't go up any hills in it. > >Hendrik >with no boat > >Jim Cathey wrote: > >> What a shame about your boat motor, Jim! Are you planning to repower > >> it or > >> just give up on it? > >> > > > > Plan to fix it, whatever's wrong. Repower is a distant > > second, new motors are UUUUU-gly. (And north of $6k.) > > > > -- Jim > > > > > > > >_______________________________________ >http://www.okiebenz.com >For new parts see official list sponsor: http://www.buymbparts.com/ >For used parts email [EMAIL PROTECTED] > >To Unsubscribe or change delivery options go to: >http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > >_______________________________________ >http://www.okiebenz.com >For new parts see official list sponsor: http://www.buymbparts.com/ >For used parts email [EMAIL PROTECTED] > >To Unsubscribe or change delivery options go to: >http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com Loren Faeth _______________________________________ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
