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Old 05-20-2015, 12:12 PM   #21
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Eric, both diesels. Ones a cat and I'm not sure if the Mack has a Mack engine or another manufacturer in it.

The Expedition isn't diesel.


The old Macks with no power steering and just barebones are tanks of trucks.
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Old 05-20-2015, 12:37 PM   #22
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The use of spark ignition reduces the loads enough so gas engine construction , and weights can be had.
Are you saying that the spark ignition allows them to reduce the compression and therefore also reduce weight via lighter construction?

The comment in the article about them converting a gasoline engine into a diesel engine brings back memories of the GM diesel fiasco when they attempted to do the same in the late 70's.
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Old 05-20-2015, 01:28 PM   #23
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Yes the lack of an explosion for combustion reduces the peak cylinder pressures enough that the loads are no higher than on a gasser.

The air flow/flame travel during combustion on a spark engine is controlled by the chamber shape.

These will be as quiet (no cylinder walls ringing) as any gas engine , as light as any other engine with direct injection .

The fuel filter will be extra fine ,as usual for electronic injected engines .

Probably light aircraft will be the first adapters after military drones , but the rapid death of ethanol poisoned gasoline might make the outboard guys do the dance with the air police first.

The first GM diesel was a conversion and it was a disaster.

The second used a special block and crank and it is one of the most sought after engines for race cars , after its rebuilt for gasoline to 600+ HP
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Old 05-20-2015, 01:57 PM   #24
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Quote:
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Are you saying that the spark ignition allows them to reduce the compression and therefore also reduce weight via lighter construction?

The comment in the article about them converting a gasoline engine into a diesel engine brings back memories of the GM diesel fiasco when they attempted to do the same in the late 70's.
Yeah, Conrad.....the same alarm bells went off with me. Long before GM did the gas to diesel conversion, Dodge did there own conversion of a 331 cu. in. inline 6 back in 1936. Same result....couldn't keep the heads on them. Blown gaskets, warped heads and stretched head bolts were the norm. Sound familiar?

Anyway, with 95 percent parts interchangeability between the gasser and diesel version, it sounds like the same old approach, but with the mention of the beefier sleeves and spark ignition for lower compression (lower cylinder pressures), could they have actually learned something?

For my money, I'd like to see an EPA approved diesel outboard line, especially in the 15 to 150 HP range. Making it light in weight might require some metallurgic/composite evolution that, as mentioned in the article, the involvement of the DOD could push.
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Old 05-20-2015, 06:24 PM   #25
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Yanmar Diesel Outboard

Love our VW TDI Wagon.....tons of power and 46MPG. Saw this Yanmar Diesel Outboard at the Charleston Tall Ship festival a few years ago....
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