Briggs & Stratton 5hp - Craigs List AD

[RRitt]

Re: Briggs & Stratton 5hp - Craigs List AD

Briggs and Stratton **COULD** make a decent outboard. Whether or not they are doing so now is a matter of opinion.

The motor you pictured is definitely a better product but not every boat is big enough for that. I think that engine in picture might sink my canoe. If anything I would prefer a smaller and lighter engine. 2HP aluminum block air cooled 4stroke with steel sleeves and oversize muffler would have been my first choice. B&S was nearest thing I could find. Do you know of an engine closer to the desired?

and your point is what boobie?

i think his point is that an engine will run in outer space as long as you don't completely plug up the exhaust.

 

[Joshua Nichols]

Re: Briggs & Stratton 5hp - Craigs List AD

Bogs and scrap-iron
I went to the seminar when Briggs came out with these things.. No water pump was a nice feature... they was only retailing for $599 back then.. inflation is rough.. Sold a couple.. The titling of the unit made it undesirable for the company I worked for to sell anymore.. Didn't ever have any warranty work come in for them..

 

[mrcrabs]

Re: Briggs & Stratton 5hp - Craigs List AD

i think his point is that an engine will run in outer space as long as you don't completely plug up the exhaust.

Oh yeah I see, a nice rich charge of gas and excellent exhaust scavenging there in outerspace eh?. I bet the torque would be awesome, for a 2 cycle looper that is.

 

[RRitt]

Re: Briggs & Stratton 5hp - Craigs List AD

Oh yeah I see, a nice rich charge of gas and excellent exhaust scavenging there in outerspace eh?. I bet the torque would be awesome, for a 2 cycle looper that is.

shoot man - just dump your exhaust straight into the expanses of outer space. No pollution laws up there and his engine doesn't need any intake, just fuel and exhaust.

 

[Tommy Two Stroke]

Re: Briggs & Stratton 5hp - Craigs List AD

Regarding this discussion of adding an exhaust exiting underwater to a 4 cycle B&S outboard, it really isn't that big of an issue. The only significant back pressure occurs at startup, when the column of water is pushed out of the pipe, from the waterline down to the bottom of the pipe. Once the engine is running, there's virtually no back pressure caused by the water itself - only that caused by the restriction of the pipe. Blowing through a straw in a beverage is similar....the initial downward displacement of the water is what causes the most back pressure, but when all water has been displaced from the straw and bubbles come up through the beverage of choice, the back pressure goes way down.

Further, taking design clues from existing outboards, for such a setup, is essential. Most outboards have an exhaust which doesn't exit all that far below the waterline - usually just above the propeller. Designing a system for a 4-cycle engine such as the B&S, should emulate this setup and if it does, very little water-induced back pressure will occur.

Many riding mowers with large 4-cycle single and double cylinder engines, have an exhaust that's at least 24" long. The point is, it can be done, and once the column of water in an outboard setup is pushed out of the way during the initial starting of the engine, very little back pressure is caused by the water itself.

Like others have said here, B&S used an above-the-water exhaust on their 5hp outboard largely because of Coast Guard regulations.

 

[mrcrabs]

Re: Briggs & Stratton 5hp - Craigs List AD

http://www.physicsforums.com/showthread.php?t=206232

 

[RRitt]

Re: Briggs & Stratton 5hp - Craigs List AD

so .... if i got this straight .... reading the last two posts and the link.

It won't make much difference on a 4 stroke because all it needs to do is dump out the waste. Some concerns exist but they are mostly a matter of performance tuning. However, do not mess with the exhaust on a 2 stroke. 2stroke exhaust and carbs are both part of a single system that has been tuned to a specific rpm. At that rpm, the almost all of the fresh fuel/air is prevented from escaping by exhaust backpressure. Change either of the two and you need to start all over with both. Or have an crummy running engine that gets terrible gas mileage.

 

[garzilla]

Re: Briggs & Stratton 5hp - Craigs List AD

Wouldn't just drilling a few small (1/8" or smaller) holes in the pipe work wonders for back pressure?.....just above the water line...

I'm working on taking a 9.9 sears outboard lower and marrying it to a mower engine....just trying to figure out two things.....mating mowers output, to outboards driveshaft......and, getting the mower to idle down enough so I can still shift....

 

[mrcrabs]

Re: Briggs & Stratton 5hp - Craigs List AD

9.9 lower and Briggs or even a modern Tecumseh is a good combo, I would guess idle will require deleting any Governor related parts and re thinking the throttle and kill switch, maybe even timing adjustments to get the idle down, 9.9 gears are not cheap...biggest problem you have to face is keeping the driveshaft seal in, if your shaft coupler lets the drive shaft wobble you will beat the seal out of the lower,

I would keep the pipe as shallow as you can, back pressure is not a problem while underway....I think the problems will comes while at idle and just sitting, depending on the weather temp.
you could put a mechanical cutout on the pipe if you want to get fancy and then just let her rip

 

[garzilla]

Re: Briggs & Stratton 5hp - Craigs List AD

Mmmm.....exhaust cutouts..lol

I'm thinking about putting some type of carrier bearing near the top of the driveshaft....it is quite sloppy up top without the motor attached to it..

Then again, I'll have zero invested in this project, so if it consumes itself, so be it..

 

[mrcrabs]

Re: Briggs & Stratton 5hp - Craigs List AD

I would be very interested in what you use for a coupler.

keep us posted on your Ideas.

 

[garzilla]

Re: Briggs & Stratton 5hp - Craigs List AD

I was actually thinking about just using the piece that attaches the blade onto the shaft of the motor.....it's already keyed to fit the engine.

Getting that to work on the drive....well, I'm thinking about cutting the end of the original crank off....that's splined to the driveshaft already.....tig weld together, and I should have a non permanent coupler....

I just need to take my mower back from a buddy I let use during the summer....sorry bro lol!

It's a toro, runs real good, but puffs a little smoke....hopefully all mowers use a similar style coupler....i can't remember the toro setup......Im going by my yard machines mower im using now.

 

[steelespike]

Re: Briggs & Stratton 5hp - Craigs List AD

While not having read all the posts;It seems to me he is running in some pretty gungy water and one of those "MudPuppys" About 16hp Briggs type motor mounted to the transom like an oar. They appear to run through anything including mud.I think there are
some utubes about them or maybe a web site.
I think he also mentioned "salt" which I'm sure the Briggs leg won't like.
Check out Gatortail,Mudbuddy,Prodrive,Go devil.Look like fun and practical if you have to run in mudflats,marshes and swamps.

 

[boobie]

Re: Briggs & Stratton 5hp - Craigs List AD

There was a good artical about the Mud Buddy in the latest Trailer Boats magazine. But I think it might be a little heavy for a canoe. All 4-stroke lovers should really like it though.

 

[tx1961whaler]

Re: Briggs & Stratton 5hp - Craigs List AD

I've taken my little 3 HP Johnnyrudes in some pretty darn shallow muddy water and never clogged them up. They get mounted up pretty high on the transom, so the prop is barely under the hull.
If they ever happen to get clogged up, it would take me a grand total of fifteen minutes with an open end wrench and a flat bladed screwdriver to get the water pump unclogged.
The Briggs and Stratton is NOT DESIGNED for use in brackish or saltwater, unless something has changed in the past couple of years.
"This motor is designed for freshwater use. Briggs and Stratton will not honor the warranty if this engine is used in saltwater."
http://www.smalloutboards.com/bg5.htm

Had a one cylinder clunker one time. Never again.

 

[mrcrabs]

Re: Briggs & Stratton 5hp - Craigs List AD

Had a one cylinder clunker one time. Never again.

sissy

 

[tx1961whaler]

Re: Briggs & Stratton 5hp - Craigs List AD

sissy

Yes!

 

[Socal Pat]

Re: Briggs & Stratton 5hp - Craigs List AD

I ran a Briggs for a few years. I finally replaced it with a Nissan 6hp. The Nissan was a bit quieter and smoother, but didn't really push the boat any faster. Thing is that after sitting on the side of the house uncovered for more than a year a guy came by to buy the Briggs. I stood it up, pulled the choke and it started on the 1st pull!!

 

[1946Zephyr]

Re: Briggs & Stratton 5hp - Craigs List AD

Well, I think Briggs and Stratton makes just as good an engine as anyone. 90% go to the dump as a result of neglection. Often times I have picked up mowers that just need a simple clean up of the points, or a minor fix of some kind. I think a lot of guys replace their old mowers, because their bored with the one they have and want something new.

There's still some good old Briggs out there runnin. I sold a 1936 Model Y that ran like a top and was in great mechanical shape. I think I could put up with the noise.