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Started By
Message
Will we ever have a 4-stroke surface drive motor?
Posted on 7/14/15 at 9:08 am
Posted on 7/14/15 at 9:08 am
Like a 4-stroke outboard. Had this conversation the other night. It would be awesome to have the versatility of a surface drive but the quietness and power of a 4 stroke. I understand cooling is an issue but it seems that it could work. Anyone see any issue with this? A 40 HP 4 stroke surface drive would be incredible IMO.
This post was edited on 7/14/15 at 10:18 am
4
Posted on 7/14/15 at 9:10 am to PapaPogey
Power?
Posted on 7/14/15 at 9:30 am to PapaPogey
A certain company in LA has been working (R&D) on this idea for about a year now.
eta: and yeah, wouldn't have nearly the same amount of power as a 2 stroke. The noise and efficiency would nice though.
eta: and yeah, wouldn't have nearly the same amount of power as a 2 stroke. The noise and efficiency would nice though.
This post was edited on 7/14/15 at 9:33 am
Posted on 7/14/15 at 9:33 am to PapaPogey
Aren't they all 4 stroke? I've never seen a two stroke one.
They're so loud because they're air cooled and the muffler is the size of a coke bottle. If they were water cooled with exhaust outlets below the water line they would be much quieter.
They're so loud because they're air cooled and the muffler is the size of a coke bottle. If they were water cooled with exhaust outlets below the water line they would be much quieter.
Posted on 7/14/15 at 9:38 am to DownshiftAndFloorIt
quote:
Aren't they all 4 stroke?
Depends on the motor.
What I was referring to was converting an actual 4stroke outboard into a surface drive.
Posted on 7/14/15 at 9:40 am to bluemoons
I've never seen a two stroke surface drive.
If you took a 40hp four stroke Yamaha outboard, put a big fan on the top, and put a coke bottle muffler on it dumped out the cowlin, it would be loud as hell too
If you took a 40hp four stroke Yamaha outboard, put a big fan on the top, and put a coke bottle muffler on it dumped out the cowlin, it would be loud as hell too
Posted on 7/14/15 at 9:42 am to bluemoons
Well seeing that the premise is to run in theoretically no water, the issue is cooling water pickup. I assume incorporating a self contained water cooled system would be weight prohibitive.
Posted on 7/14/15 at 9:52 am to Coon
and expensive
for example on lawn equipment the water cooled option (radiator) is much more costly
for example on lawn equipment the water cooled option (radiator) is much more costly
Posted on 7/14/15 at 10:04 am to PapaPogey
I saw an outboard in Florida that had a water tank and used that water to cool the engine instead of lake water. It was a large motor, too. Like a 150 if I recall correctly. I'll try to find some pics.
I think he was at one of the rides put together bt the mudmotortalk.com guys.
I think he was at one of the rides put together bt the mudmotortalk.com guys.
Posted on 7/14/15 at 10:06 am to cgrand
You'd have to use a radiator on what OP is proposing.
I've wondered the same thing. A radiator and electric fan for a motor that size wouldn't be too intrusive and it seems like a no brainier to put a much bigger muffler.
I've wondered the same thing. A radiator and electric fan for a motor that size wouldn't be too intrusive and it seems like a no brainier to put a much bigger muffler.
Posted on 7/14/15 at 10:10 am to DownshiftAndFloorIt
Im gonna need a bigger boat...and god forbid you stick it.
Posted on 7/14/15 at 10:12 am to tigerfoot
Nahhhh. It wouldn't weight much more and the radiator would be pretty tiny. It would just be more expensive. It doesn't take much water and air at all to cool a little two cylinder 50 horse motor.
Posted on 7/14/15 at 10:13 am to bluemoons
quote:
What I was referring to was converting an actual 4stroke outboard into a surface drive.
Yeah that's where I was going with this.
Posted on 7/14/15 at 10:28 am to DownshiftAndFloorIt
I guess all of the standard big blocks are fours. Some of the smaller manufacturers use 2 stroke kohlers though.
Posted on 7/14/15 at 10:38 am to bluemoons
The Seven Marine 557 uses a closed loop cooling system. Antifreeze runs thru the motor but it is cooed by a small radiator that uses a conventional water pickup in the lower unit. Keeps corrosion from getting in the motor.
LINK
LINK
quote:
Closed-loop cooling. Cool Saltwater belongs in the ocean, not the engine.
Posted on 7/14/15 at 10:43 am to meauxjeaux2
All of the bigger inboard marine engines that use seawater are cooled like that. It's expensive because it requires at least two pumps and an expensive water to water heat exchanger.
Posted on 7/14/15 at 10:50 am to DownshiftAndFloorIt
you would either need an above deck radiator or run channels on the bottom of the hull like a tug to use a water cooled motor. However this would do nothing to solve the loud exhaust issue. When i had an inboard mud boat we took a mercruiser inboard engine and braised closed the water ports on the exhaust to run a dry exhaust and used channel coolers on the bottom of the hull. Worked quite well and utilized an automotive type muffler to quiet things down. Much more costly than the typical lawn mower engine setup they run.
Posted on 7/14/15 at 11:14 am to bayoudude
Yea but channel coolers would be a pain in the arse.
It seems like the radiator would be about the size of a shoe box. Of course then you would have to deal with some serious fan noise on a small radiator.
ETA: or you could do like a big supply boat and put the radiator in the water
You'd be looking at a $20k motor by the time I got done with it, but that bitch would be badass.
It seems like the radiator would be about the size of a shoe box. Of course then you would have to deal with some serious fan noise on a small radiator.
ETA: or you could do like a big supply boat and put the radiator in the water
You'd be looking at a $20k motor by the time I got done with it, but that bitch would be badass.
This post was edited on 7/14/15 at 11:31 am
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