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  #1  
Old 01-24-2011
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2 stroke inboard

I was wondering why there is no or almost no 2-stroke inboard engines??
I know that they burn more gas then diesel engines but they can run even if the boat is heeling 45 degree. I think thats a big + for 2 stroke.

The only thing very bad about 2-Stroke is the risk of explostion caused by the gazoline in your tank...

I was thinking about that because one of my friends ran into bad weather last year, got scared or something and started he's disel...he broke'blew it.


I only saw two 2 stroke inboard, one was in a contessa26 and the other one was in a paceship 25 I think.
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Old 01-24-2011
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Did the diesel faill because of the angle of heel? I would have figured that there would be enough oil in the sump to handle moderate angles of heel. On one of our previous boats, our motor used to quit in rough weather with high angles of heel, but I think it was because we only had a 20 gallon fuel tank, and the fuel pickup tube was on one side, so we would start sucking air.

Our first boat had a 6 hp Evinrude on it that burned 1 gal/hr. Our current boat is around ten times heavier with a four stroke diesel that burns around 1gal/hr.
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Old 01-24-2011
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2 stroke gas engines are almost dead because of emissions regulations. Evinrude is really the only company still making them for sale in the US. You can't find them in a sailboat because there isn't the market for them so no one makes one.

While it is true that a flooded sump engine has more problems at very large angles of heel, in my opinion that is an appropriate trade off given all of the other advantages.
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Old 01-24-2011
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Quote:
Originally Posted by PeterSailer View Post
I was wondering why there is no or almost no 2-stroke inboard engines??...
Two-stroke engines are dandy, if you don't mind the the noise, smoke, and fuel inefficiency.
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Old 01-24-2011
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Quote:
Did the diesel faill because of the angle of heel?
yes i'm pretty sure,he ran in some very nasty stuff...He was trying to sail in the south from New-Brundwick Canada and when he was off Nova-scotia he ran in a storm.( not sure if it was a actual storm but thats how he called it...) I think he was trying to get away from a lee shore so he started the motor to mortor-sail and then he lost he's motor.


Quote:
2 stroke gas engines are almost dead because of emissions regulations.
That make sense, a couple of my buddies were complaining a while ago about some laws that were gonna kill the 2-stroke motocross.
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Old 01-24-2011
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OMC and Volvo both produced a 2 stroke saildrive unit... neither proved historically reliable and despite the reduced cost vs diesel never really caught on. Most boats originally so equipped now sport outboards (many of them still have the original drive unit in place)
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Old 10-23-2013
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Re: 2 stroke inboard

One of the advantages of two-stroke is weight. For inboards weight is less of a goal (they're lower and don't get moved by hand). But there have been a number of them. Lots of Contessa's shipped with Vire 7hp 2-stroke gas engines for example.

There have also been some two stroke diesels.
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Old 10-25-2013
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Re: 2 stroke inboard

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Originally Posted by asdf38 View Post
There have also been some two stroke diesels.
I have read this, but have never seen one. Air cooled yes, but never 2 stroke.
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Old 10-25-2013
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Re: 2 stroke inboard

There are TONS and TONS and TONS of 2-stroke diesels around!
GM Diesel - now Detroit Diesel - ring a bell? 6-71 etc.

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
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Old 10-25-2013
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Re: 2 stroke inboard

Back in the mid 80's my dock neighbor built his own inboard 2 stroke out of a out board Evinrude . It was really cool I wanted to do it to my boat (O'Day23) The Admiral freaked out . I had to admit that would have been a big hole in the bottom of the boat .
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