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Old 26 December 2013, 07:42   #1
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Propane Outboards

Anybody seen these before??

LEHR Marine |

The chap who services my engine is selling them now and they seem an interesting alternative for the occasional boater.

Chris
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Old 26 December 2013, 11:01   #2
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What advantages have they got over 4 stroke petrol engines?
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Old 26 December 2013, 11:10   #3
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What advantages have they got over 4 stroke petrol engines?
Higher octane (about equal to avgas / race fuel)
Cheaper per equivalent gallon
No ethanol
Cleaner burning (less impurities)
Lower maintenance (less harmful residues left behind in the engine due to cleaner burning)

You can go longer on oil changes too since there aren't a lot of contaminates suspended in it.
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Old 26 December 2013, 11:30   #4
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Higher octane (about equal to avgas / race fuel)
Cheaper per equivalent gallon
No ethanol
Cleaner burning (less impurities)
Lower maintenance (less harmful residues left behind in the engine due to cleaner burning)

You can go longer on oil changes too since there aren't a lot of contaminates suspended in it.
That's interesting. Lehr's promotional material (attached) suggest that despite the higher octane, the propane 2.5 HP is much less powerful than a Merc 2.5hp gas engine...
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Old 26 December 2013, 12:04   #5
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That's interesting. Lehr's promotional material (attached) suggest that despite the higher octane, the propane 2.5 HP is much less powerful than a Merc 2.5hp gas engine...
That's not exactly what I would call scientific testing.

There may be gearing differences between the two units as well.
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Old 26 December 2013, 12:06   #6
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That's not exactly what I would call scientific testing.

There may be gearing differences between the two units as well.
Point taken for sure. I think if I was Lehr, I'd use more scientific testing for my promotional material
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Old 26 December 2013, 12:39   #7
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And you can easily refuel.... Where?
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Old 26 December 2013, 13:37   #8
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B&q...
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Old 26 December 2013, 13:49   #9
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And you can easily refuel.... Where?
Propane is the standard yachting fuel for cooking over here. Alcohol and diesel stoves are a very distant 2nd + 3rd. Compressed natural gas (methane) is non-existant in the yachting world.

So pretty much every marina on the west coast of North America has propane. The 1lb canisters seem like a bad way to go though. They aren't really refillable while being heavy and taking up alot of room too. The composite tanks are rustproof and light.

Floodproof and quickstarting seem like pretty admirable qualities in a tender engine which might go long periods between use.
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Old 26 December 2013, 17:14   #10
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As does fuel not going stale. You'd have to carry a lot of propane to run one as an auxiliary though and it wouldn't be easy to monitor fuel levels.
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