am I the only one who watched the entire video just waiting for the boom?

That was remarkably unspectacular.

I think we all know that the Intake is carbon free since it burned it all off.

I love doing stuff like this! That nitro exhaust always smells awesome! Great vid!

holy shit dude! that engine kept up the whole 3 minutes without melting a piston or something crazy like that! very nice

That ran far longer than the dragster engines specifically built for nitro. Those run under power for 4 seconds, the crankshaft turning less than 1000 revolutions, and then are totally rebuilt.

Hell yeah...when I used too move the lawn where I lived a few years ago I had a string to the gouvernor...when I run over some nasty tussocks of grass I pulled the string and the B&S gave up a roar and cutted grass, moss, feet...just everything...

When I was 12, I got a B&S horizontal-shaft to play with. I bolted it to a bench and played. It ended when I taped an oxygen hose to the carb. There are still pieces in the garage walls-but it wailed for a little while!

I like the way the plastic sheathing burns off the throttle cable just in front of the exhaust.

Great sound!^^

love the glowing red exhaust LOL

There was supposed to be a boom. where was the earth shattering kaboom!

I was worried about the cable burning.

Looks like it's going to the track by itself!

You got yourself the wolrd's smallest Go-cart engine for racing.

thats what most of the lawn mowers in my area sound like lol

wow that lasted longer than i expected them briggs can be unpredictable

Look at that red hot exhaust!!!

Boy, with that red out inside in the muffler , i'd bet it would be perfect for a turbo

nice engine man

the exhuast fumes were just so hot from running the nitro that the metal on the exhuast turned bright red

1:14 lol so much power it doesn't need driveline or wheels

many years ago i read up on nitro. it losses ability to make lots of power in a small combustion chamber. because nitro needs a very high air to fuel ratio. close to 1: 1.5

i ran a lawnmover on 50/50 petrol methanol It was old and the grass to high for it until i ran it on that mix :P very nice smell and good sound of it... :D

Nem is also completely correct, yes there is no external load, so there is no net power. But since it is spinning there is power at work

Our Generators Muffler will do this after about an hour of running. You can always find the damn thing by looking for the red glow of the muffler.

Would be a fun project for a little go-kart.

How did that thing not blow up that's a tuff Briggs

This engine is UNDESTROYABLE

Did you open up the carbs main jet?

for starting the small rc engines you connecteda 1.5 volt no 6 cell to the glow plug then a few drops of fuel in the exhsaust ports for priming and then flip the prop with your finger once running you diconnected the battery from the glow plug these engines where two stroke and ran around 15.000 to 20.000 rpm i think they also made pure diesel and spark ignition rc engines they where probably more cosly

sweet, did you have to tinker with the carb so it ran right? or just dump it in and go?

@53Poot the ignition system on a top fuel car only works to keep the engine running when its cool, during a run, the last 3/4 of the run, its dieseling and all the nitro rc engines run diesel cycle

Awesome! you should put the briggs on a go-kart and do that! I'll be restoring an engine in a few weeks and i'm gonna fill the tank with nitro n petrol too!

this is a terrible idea... I love it!

@53Poot actuly the top fuelers burn out their plugs and end up dieseling about 1/2 track or so... the heat in the combustion chamber is enough to self ignite the fuel and nitro rc engines run on the diesel cycle as well... no ignitions at all, just glow plugs to help start them

@naturalyshocked dont get your nitro's mixed up. nitrous is an oxidizer, nitromethane just contains its own oxygen. nitromethane is injected at about 8x the rate that same engine would consume of gasoline. hydrazine is fun. be careful :)

Well by the looks of the red hot exhaust; the piston is glazed, the rings are fried, and the cylinder walls are completely scored to hell.

rig up something like a rotor from a car with the brakes fully working and have something to set a certain pressure to load down the engine.

the muffeler was burning the little wirer lol

that is redglowing hot!

@benrobinson72 reread my post. I said "Never seen a four stroke briggs?" as a question directed towards v8motorheader. I learned about four stroke engines on a Briggs and Stratton in high school. some other guy said it was a two stroke and I was replying.

i would agree with mageac about a lot of the small rc engines i tinkered with these when i was young yes they do run on fuel very similar to nitro if not actual nitro and once running the heat of the explosions kept the glow plug hot enough to ignite the following fuel charges maybe it was not quite a diesel cycle where air compression just itself raises the air temp high enough it was more the fuel burning hot enough to keep the glow plug hot near incandescent

a briggs would melt before it would blow up, gotta love em.

what was glowing hot in there? wow. NIce video

the inside of that muffler looks like lava

fire!

Wow, engine kept up well, it might warp the engine parts. Thanks.

@mystiqueman366 ... no pretty sure they still have fly wheels... its always right under the pull start assembly

rofl. i want to roast marshmellows with that exhaust.

What a champ!!!

@v8motorheader Never seen a four stroke Briggs and Stratton? Cuz that is what this looks like. Simple flat head four stroke one cylinder engine.

that'll blow out the rings!

I hate when people do this and don't do a teardown video afterward..

you are totaly right serously

I think you're running a little warm there buddy.

Oh nice, you can see the exhaust disintegrating, either that or carbon sparks :)

how is it running with no blade? was the flywheel swapped with a cast-iron one? because dosen't the blade act as the flywheel for these motors?

Oh your right, I wasn't even thinking when I said that. D:

Don't worry my John Deere closed her eyes for this one.

This engine are so strong. Have you registerer how much RPM has developed?

You need a very rich mixture with nitromethane !

my 3hp briggs on a cheap gokart had sparks flying out of the exaust. that was months before the carb said "fuck this. im out."

you can see that bolt spinning.

ur killing that engine the sparks coming out of the exhaust is metal lol

ok, loose carb explains the changing mixture. no load explains the excess vibration and loose carb. So, add a load and watch the nitro start making real heat. 100% nitro can reach 7000 degrees under full load. That will melt an un-coated aluminum piston in seconds. however, the crank will exit the block before that happens. Nitro also likes 65 degree BTDC timing. Nitro is just fuel. still needs air, spark, cam, and perfect timing to match the rpm and load.

That cable you had running to the carb, later in the video, it falls in front of the exhaust and the black coating melted off. Look at 2:54 and you will see the line over the exhaust has the black coating melted off...

OOppps, looks like the muffler is burning the throttle cable. Better get a new motor for the throttle cable.

Put the carb back on, dump some gas in, then go mow the lawn with it! Those engines are tough little bastards!

@mambacx vertical shaft engines have an aluminum flywheel which doesnt have enough mass to act as a real flywheel, the blade acts as the flywheel cause it has more mass

the 3 horse power engines never had enough power to mow a lawn that was over 3 inches tall. today i have a 4 1/2 horsepower, and it has enough power to cut my lawn (if it could be called a lawn)

Towards the end, I think it was running more on the burning metal than the nitro....

should have threw some water on it and watched it explode!! the sparks coming out of it was probably the sound deadening material inside the muffler, but in my experience the first things to cook inside the engine from overheating are the spark plug and/or the piston... and if that happened it would have died very abruptly.

I thought it would self-destruct.

B&S rock. They stand the tet of time.

Poor little Briggs and Stratton motor lmao

But I do agree that side valves are severely dated. Compression ratio suffers somewhat, but the centered spark plug doesn't hurt.

That will never run again ! Strong engine tho

yeah, you're right ...hould have written it full out.

How to add some load? Maybe with a driving belt conected to something...

Now that you burned the carbon and sludge out of 'er, she outa purr like a kitten.

@whatsdare i believe the sparks are pieces of piston and rings burning out the exhaust hahahahaha

at 0:54 the muffaler getin hot :3

come on people its just a bit of fun with a lawn mower engine!!! not like its a rare vintage car or something!

it will run on it but like that one guy said straight pipe it to disapate heat and put a glow plug cuz the spark plug will melt and change shape and the gap will open i know it from experience and by the way your exhaust valve is over heating and sticking open if your not careful you will melt the camshaft if it has the plastic one

briggsand stratton are UNSTOPABLE!!!

Nitromethane is HIGHLY flammable. top fuel drags run I think a mixture of 90% nitro and 10% alcohol. it'll burn up your engine though which you can see happen in this vid when the engine starts shooting sparks out of the exhaust.

you made an air pump turbine

yep, if it really went on nitro, the jet nozle should be something like 8 times bigger. atleast from what i have understood, a dragster uses 8 times the fuel amount per stroke vs a normal car. and nitro having a oxidizer built in.

for a 3hp motor that is pretty damn good but yea it s just a little tom hot lol

98% nitro, 2% Methanol

You are quite wrong. Horse power is a measurement of lb's per foot. Granted it might be very low, the fact that the motor is running and the output shaft is spinning means there is power being generated. There is a law called the conservation of energy. That means for every little bit of power, the same will come out. Most is lost to friction, and the rest is sent out. That means that since the motor runs, there is energy at work. This is essentially generating horsepower.

Briggs and Stratton quality

gotta love governors!

A pipe exhaust would help the poor thing breath. Remember it is a sidevalve engine. also the stock connecting rod will not handle this vibration and speed.

haha at 2:21 the bolt holding it to the skid falls out

Looks like you need the spark arrestor ;)

That was a cruel thing to do. Looks like it de-coked itself a few times there.

this is why im a briggs and straton lover fuck yah that was awsome >:D

do it with a line edger, its awsome