Monosoupape type engine running -Briggs & stratton

[shinyfuzzy]

i saw a 2hp briggs and stratton verticle shaft engine in the junk yard the other day... is it rare? ive never seen one b4. in was on one of those lawnboy type mowers with the wierdd deck design but i think it was a knock off

[ChargerMiles007]

@shinyfuzzy

I would say it is fairly rare, since it is probably from the early 1960s.

I personally have no idea if any of this stuff is collectable, or worth anything other than to us Briggs Guys :)

[shinyfuzzy]

@ChargerMiles007 u would love this junkyard btw, tons of briggs 3-5hp engines and lawnmowers just stacked

[ChargerMiles007]

@shinyfuzzy

Really, it sounds like a real Briggs Haven!!!! <3

Unfortunately, the garage I had my stash stored in is being sold, so I have a ton of them all sitting on my lawn!!!

I always look for the long crankshafts on the 3.5hp mowers, since I need them to mount the chain speockets onto to make my FrankenBriggs engines :)

[PivotMasterD1]

Wow. Those Briggs engines sure run no matter what! (For the most part, anyway)

[ChargerMiles007]

@PivotMasterD1

Yes, all the engines I have built, do indeed run, perhaps for only a short time, but they do run! :)

[tpvalley]

@ChargerMiles007

how is the crank case charge controlled?

reed valve?

[ChargerMiles007]

@tpvalley

Actually, this one just uses oil in the crankcase, it is only the "Piston Valve" engine that has gasoline/oil mix in the sump.

This engine uses ports in the cylinder wall for inlet ports, and both poppet valves are for exhaust.

I actally re-used this block for the inlet block on my Jumo 205 engine, I also use it for the supercharged 2 stroke Briggs. I have a new block with larger inlet port holes, for use on the Jumo 2o5, but the manifolding takes some time to do, I got lazy! :)

[tpvalley]

@ChargerMiles007

what draws the fuel air mixture through inlet ports if its not blown or using the crank case like a 2 stroke?

[ChargerMiles007]

@tpvalley

It is a 4 stroke engine, but uses a modified cycle.

On power stroke, both valves open very early for exhaust, this bleeds the pressure down, so that when the piston uncovers the small inlet ports, no exhaust goes into them. The piston goes up on exhaust, then the valves stay open past TDC, about 1/3 of the way down in the inlet stroke, pulling fresh air in thru the ex. valves. A high vaccum developes when the valves close, around BDC, inlet ports are uncovered, mixing rich mixture..

[ChargerMiles007]

@ChargerMiles007

...mixing a very rich mixture from the carb, with the air already in the cylinder that came in thru the exhaust valves. Then the piston goes up on compression, then power like a normal engine.

Somebody sure had their thinking cap on to figure all that out!

It was a bit hard on exhaust valves due to the fact that they were subjected to hot exhaust, then fresh cool air.

[tpvalley]

@ChargerMiles007

ah, I see.

[ChargerMiles007]

@tpvalley

Glad I explained that OK, I never know how well I explain things sometimes, and the 500 character limit doesn't help matters any!

[pimprock23]

did you paint thhis your self?

[ChargerMiles007]

@pimprock23

Yes, I painted it using car type laquer spray cans.

I am trying to make each engine a different color so they all visually look different, but I am running out of colors!!! :)

[kriegdouch]

like to see how you made the intake manifold. how was the fuel controlled, by the carb. i guess the only way to throttle up the motor is to lean it out yet slowly giving it more fuel, or am i wrong. i guess its very hard predicting the right ratio since it's not sucking in fresh air. at first i thought it was goin to over rev, but i guess that rich fuel charge chokes it down a bit

[ChargerMiles007]

@kriegdouch

I just use the normal throttle to control it, but the choke has to be shut most of the way for it to run.

i use the stock inlet manifold, but it feeds the mixture into a row of cooling fins that I turned into q manifold around the block. There are holes drilled from the manifold thru the clylinder wall, allowing the rich mixture into the cylinder at BDC, similar to the original monosoupape.

[mudpuppy4life]

sounds like a rotary

[ChargerMiles007]

@mudpuppy4life

Yes, it does, I think that is because of the poor mixture control, which was probably the case in some of those engines also. The piston valve Briggs also doesn't run smoothly. There sure have been a lot of advances in engines over the last century!

[shinyfuzzy]

how did u make that?!

[ChargerMiles007]

@shinyfuzzy

This one was one of my first engines. I welded up the camshaft to give it very long duration, like 370 degrees, and it opens both valves as exhaust. I drilled a row of inlet ports in a row of sooling fins, and JB-Welded up a new intake manifold. This engine is based on a crankcase breathing 4 stroke from the WW1 era, one of the old Rotary engines.

[429FordMuscle]

your vids are cool as hell!! 

[ChargerMiles007]

@429FordMuscle

Thanks, glad you like them :)

[1972FordF150]

Hey, if you would mow the lawn with this engine, how well would it work ?

[ChargerMiles007]

@1972FordF150

I actually did that about 10 years ago when I first built it. It cut the grass OK, but I can't say it was a real Powerhouse, but it sure is LOUD!!!!

[1972FordF150]

@ChargerMiles007 so it doesn't have as much cutting power as a un modified briggs 3.5 ?

[ChargerMiles007]

@1972FordF150

Right, since the engine can't breath as much air with the choke being shut all the time to keep the mixture rich enough for it to run.

[coreystouffer]

dude put a muffler on it

[ChargerMiles007]

@coreystouffer

You can't do that with a Monosoupape!

The engine pushes out the exhaust, then sucks fresh air back in thru the exhaust valves, so a muffler would mess that up!

Plus I LIKE Loud engines! :)

Wait till I find my 12:1 high compression head, I will build a Briggs 902 Max Noise!!! :) The loudly Barking dogs in my neighborhood will LOVE that!

[coreystouffer]

@ChargerMiles007 ohhhhh i didnt understand but i do now,,,,thats pretty cool,,,,,when was that engine built?

[ChargerMiles007]

@coreystouffer

The real engines were built during the first world war, so 1914-1918 range

The Piston valve was built earlier, as the Mono was made to replace it.

[mrnakers2]

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[ChargerMiles007]

@mrnakers2

Howdy, interesting comment, kind of creative :)

[mrnakers2]

kyler is my friend but i really like it

[mrnakers2]

Tvgcfthjrdudvgdvh v gtvi

[ChargerMiles007]

@mrnakers2

Man, that must be in some kind of Code! :)

[KrankieV2]

it sounds rather odd, very cool engine. I never knew any such thing existed!

[ChargerMiles007]

@KrankieV2

Yea, they were sure Strange Animals, lots of experimentation going on back in those days!

[jjmqwerty]

what is your email address?

[ChargerMiles007]

@jjmqwerty

Why do you want to know that, you aren't the YouTube Police or some Smog Sniffing G Man are you?!!! LOL These engines I build will pass everything BUT an Emissions test!!!

Send me another message, and I will think about it :)

[XELA2T]

now this is very interesting too, it even has a little bit the sound of a complete rotary.

Btw I did not forget and send you 3x message, I cant see here even one, did you receive any?

[ChargerMiles007]

@XELA2T

Yes, I got 3 messages. Yea, I know what you mean, this engine stutters like a rotary engine, I think it is poor fuel distribution and mixing. This is about the simplest engine I have built.

[SAGKFCASBOST1CSX]

very cool indeed i also saw the sleeve valve engine very impresive

[ChargerMiles007]

Thanks, I have a fun time designing and buiding these, it can be quite a challenge sometimes to figure out a simple cheap way to make one of these old engine designs run based on a lawnmower engine.

[coshyno]

very nice !

are these easy to make ?

[ChargerMiles007]

You could make this one fairly easily, you have to modify the camshaft, I use both valves for exhaust, then holes are drilled into the block and hooked into the existing intake pipe. It was a bit of work in the end I guess, but no machine shop work is required on this engine. The sleeve valve was a different matter!

[Mrbriggsboy]

Awesome engine!

One question though - did briggs and stratton make the slide valve and piston valve and monosoupape engines or are they homebrew?

[ChargerMiles007]

Glad you liked it!

I built all these engines, the Sleeve valve, Monosoupape, the opposed and the piston valve, so they are all homebrew.

I have more that I haven't had tome to video yet, and I am slowly building a 2 stroke sleeve valve :)

[Mrbriggsboy]

Cool! You did an awesome job!

[ChargerMiles007]

Thanks :)

I sent some photos of this engine to Briggs 10 years ago, I acted like I thought it was an escapee from their R&D department, and that I bought it at a garage sale. A guy from Briggs phoned me up as soon as he got the letter, said he was laughing his butt off at it! We had a good chat, they liked the Sleeve valve also, and were surprised we were even able to build the engine, let alone rev it to 6400rpm. Good times :)

[strikeronetuber]

Sounds sweet!

Sometimes it even sounds like hit&miss, or a mix of old engine sounds! :-P

i wish I could get scrapped engines for nothing over here...

[ChargerMiles007]

Thanks for commenting, glad you liked its unique sound.

I have thought about building a hit&miss, I have a big heavy pulley for the flywheel, but fitting the exhaust valve control mechanism in has elluded me so far.

Yes, getting scrapped engines for $3-5 each helps out a lot, although you never really know what you are getting :)