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post #11 of 27 Old 10-25-2013
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Re: 2 stroke inboard

Re 2 stroke diesels: That's why so many dragsters, etc. with Roots style superchargers refer to them as 6-71, 8-71 etc. That's where they originally came from.
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post #12 of 27 Old 10-27-2013
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Re: 2 stroke inboard

I think having an oil/gas mix in the fuel tank for long periods of time might be problematic and face it, fuel tanks on sailboats are not filled often. Aside from the oil turning into varnish, we now have ethinol to deal with in gas. Another reason to choose diesel.
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post #13 of 27 Old 10-27-2013
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Re: 2 stroke inboard

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Originally Posted by Coquina View Post
There are TONS and TONS and TONS of 2-stroke diesels around!
GM Diesel - now Detroit Diesel - ring a bell? 6-71 etc.

Detroit Diesel Series 71 - Wikipedia, the free encyclopedia
Model Displacement Engine configuration Horsepower
1-71 1.2L (71ci) Single-cylinder 10
2-71 2.3L (142ci) I-2 68
3-71 3.5L (213ci) I-3 113
4-71 4.7L (284ci) I-4 160
6-71 7.0L (426ci) I-6 238
6V-71 7.0L (426ci) V-6 238
8V-71 9.3L (568ci) V-8 318
12V-71 14.0L (852ci) V-12 450
16V-71 18.6L (1136ci) V-16 635
24V-71 27.9L (1704ci) V-24 1800
Don't forget the 92 series. Lots of them out there as well but everything I've ever read, seems the 71's were the better, more reliable engine.

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post #14 of 27 Old 10-29-2013
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Re: 2 stroke inboard

What may fool some people is 2-stroke diesels use oil in the sump just like a 4 stroke and have camshafts and valves as well. They do have a fun feature that if the rings get bad and the engine sucks in the lubricating oil they will run away at full blast or more until the oil is gone.

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post #15 of 27 Old 10-29-2013
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Re: 2 stroke inboard

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Originally Posted by Coquina View Post
What may fool some people is 2-stroke diesels use oil in the sump just like a 4 stroke and have camshafts and valves as well. They do have a fun feature that if the rings get bad and the engine sucks in the lubricating oil they will run away at full blast or more until the oil is gone.
At least you don't have to mix oil with the diesel like you do with gas on gas 2 strokes.
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post #16 of 27 Old 11-13-2013
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Re: 2 stroke inboard

The early (1970) CAL 27's came with VIRE 7hp and 12hp.
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post #17 of 27 Old 11-13-2013
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Re: 2 stroke inboard

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Originally Posted by chuck53 View Post
At least you don't have to mix oil with the diesel like you do with gas on gas 2 strokes.
Actually, diesel is basically kerosene with 4% oil.
When in Rarotonga I was offered as much free kerosene (jet fuel) as I could put in my tanks, because the drums had been stored wrong and some water had gotten in. Not a big problem for a diesel, but a HUGE problem for a jet engine, I guess. After some research, I found I could safely use it if I added 4 gallons of motor oil for every hundred gallons of diesel; scored 250 gallons of free fuel oil!
Also, I've never heard of a diesel, or a marine gasoline engine failing because of rough water and/or heel. Most "marine" diesels and gas engines have a sufficiently deep sump to handle the heel/roll as no boat stays all the way heeled all the time and the rougher, the more movement. Most engine failures in rough water are caused by fuel filters plugging up from dirty tanks.
Another reason not to adapt a stationary or auto engine to marine w/o knowing what one is doing.
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Last edited by capta; 11-13-2013 at 08:17 PM.
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post #18 of 27 Old 11-14-2013
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Re: 2 stroke inboard

again good points capta....its not the heel that kills diesel in rough weather, its unmaintained diesel filters and tanks that cause it to fail when everything gets sloshed aroudn to hell, they stall and clog up the injectors which becomes a task to be done only at the dock.

I will point out though that some diesel manufacturers DO state maximum tilt angles and heel for normal use...it might have something to do with lubrication over a long period of time...I know I didnt feel too comfortable when motorsailing on my small h28 with a yanmar 2gmf...

having said that we did use it a couple of times to get out of an iffy situation...mosty thick chop when the wind died and seas were still sloppy and we were close to shore...
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post #19 of 27 Old 11-14-2013
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Re: 2 stroke inboard

to the op I WOULD love ideas on inboard 2 strokes from days gone by...I wouldnt mind trying to fabricate one since outboards are plentiful here and I am in need of an inboard as I prefer it...
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post #20 of 27 Old 11-14-2013
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Re: 2 stroke inboard

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Originally Posted by chuck53 View Post
At least you don't have to mix oil with the diesel like you do with gas on gas 2 strokes.

there are many 2 strokes that use oil injection....

VESPA motorcycle engines do so this way...they have a fuel tank and oil tank...

however those that wanted max performance took the oil injection off and mixed their own batches of oil to fuel ratio...

I have not looked into a marine version of this engine but I think it would be a great solution to old or stale fuel mix combos...
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