I think what would technically be more accurate is that this is a Briggs and Stratton that’s running on diesel fuel. It’s not actually a diesel engine, as it doesn’t actually have a fuel injector nor is it actually compression ignition. Functionally it’s a hot bulb engine, which is on its own more similar to a normal spark ignition engine than a diesel cycle one.
I had an old rider that I built to beat on in the woods. It had an 8 horse Briggs that I rarely ran gas through. I had a little liter tank to hold gas, and a bigger tank with diesel. To start, all I had to do was turn the gas on and fire it up. After a minute I'd turn the gas off and turn the diesel on. It would always run smoother on diesel, just smoked a bit.
You don't have to go thru all of that. Start and warm the engine on gasoline. Drain the tank fill with diesel, back the mixture screw out 2 turns and she'll fire and run no trouble. You just have to start it on gasoline. Did this for years with my brush push mower to keep chiggers at bay.
That's how they used to run some tractors back in the day. Two tanks. Start up on gasoline, then open diesel tank first and close gasoline valve. Messy but cheaper.
@@yewwtooob Yes. Most older tractors could run on gasoline, diesel or kerosene. There was also a really cheap fuel called “distillate”, which was somewhere between kerosene and gasoline.
I tried something like this years ago as a kid. Did the start up on gas then switched to No. 1 fuel oil (aka Kerosene). Engine ran ok on spark plug, but when i tried Diesel, it would die after gas ran out. Again, I didn't know how to modify anything at the time. Plus, there was no sense in it, because, even then, gasoline was still cheaper that Kerosene where i lived.
I've done that too, I have even mowed my yard with the spark plug disconnected once the engine was warmed up. Not much power and lots of knocking, but it got the job done.
If it wont run without the glow plug igniter, shave the head to increase compression., Diesel auto ignites with enough cpmpression. Really cool to see this. Super cool.
Awesome! I have gotten gas engines to compression ignite on kerosene (no spark or glow plug), I'm going to mess with that more when I have time. Here are some ways you might be able to improve this concept and hopefully get it to run without the glow plug once it heats up: 1. Run the engine hotter by covering the cooling fins, restricting cooling airflow, etc. Hotter cylinder temperatures will help the fuel auto ignite. 2. Get a very hot spark plug, preferably with a fine electrode. Even though you aren't using the spark, the hot electrode may be helpful. Insulating the outside of the spark plug with fiberglass to keep heat in couldn't hurt either. 3. Increase compression ratio by shaving the head and/or block as much as possible. Higher cylinder pressure will generate more heat on the compression stroke and help ignite the fuel. 4. Build a hot air intake by drawing air off the exhaust, head, or block. Hotter air into the cylinder will also result in higher temperatures during the compression stroke, again helping to ignite the fuel. The fuel will vaporize better in hotter air too.
What if it had a steel or copper fuel line coiled around the exhaust and it gets started on gas but when it warms up you turn a valve on to turn to kerosene or diesiel
@@_..-.._..-.._ diesel ignites at 1000degrees Fahrenheit so it wouldn’t ignite especially without air. All it would do is warm up the fuel so it doesn’t need as much heat to fire off when it gets in the cylinder. It has been done in the Great Depression on trucks when gas was rationed but kerosene was infinitely available so they coiled a line around the exhaust so it was heated up before going into the cylinder and that way there were gas engines “dieseling” or running on kerosene.
I tapped a r/c glowplug into the head, and blocked off some of the cooling fins in the shroud. It will run on both diesel and light crude oil. on order for it to work the engine has to be warmed up with normal spark ignition, which it will start on ether. a choke was also used.
there is no ignition timing here, there is definitely knocking. the fuel injectors normally control ignition timing for diesels because diesel combusts as soon as it hits the glow plug. does run smoother than i would think tho, also i’m no expert. i have seen people run warm 2 stokes on diesel but i’ve never seen anything like this
Not all diesels have glow plugs. The fuel does not "combust" upon hitting it. The fuel combust under pressure. At TDC high compression combustion takes place. You are right it is not ignition. The constant power to the glow plug is needed to smooth the running of the lower compression gas engine
@@droopy-ny7rv your right, i just meant when it gets compressed and forced up against it, i should’ve said upon reaching tdc, but glow plugs do also control combustion to make sure it’s a consistent burn each cycle, so in modern diesels is that not how it works? obviously the mixture must be compressed too it’s not just the glow plugs “touching” it
Some modern diesel engines do not use glow plugs. Some Cummins have grid heaters and no plugs. Several diesel manufacturers run rail and injection pressure that is difficult for some to imagine. Thankfully there is no O2 in the lines. A neat device called a Polynesian fire piston always intrigued me you may find them interesting as well But like others have made reference to this engine has compression that is much to low for diesel. A normal diesel with glow plugs are only powered before start up. Some older engines have them in a side pocket that the fuel sprays onto on its way to the combination chamber. Lots of variables in design and pressure over the decades but that's why some will reliable start in sub zero temps and some need plugged into a heater to help with cold starts.
@OAKDALE Do you have any pictures or video of the glow plug install process? is this something a person could do with a drill press and some milling/drill bits in an afternoon?
Battery doesn’t last long. So what happens when you run the spark plug? What happens when its under load? Neat trick but is it useful? How could you build more compression? Carbon the thing up? Different head?
It's a glow plug for Radio Control (RC) model airplane engines. You can buy them at any RC hobby shop. He's leaving the glow plug starter on it because the gasoline lawn mower engine doesn't have enough compression to sustain proper ignition of diesel fuel even after the engine heats up to operating temperature. The engine needs the glow plug to be heated to burn the diesel fuel which is why he has to put a fresh battery in the glow plug starter. It's fun, but will eat up batteries like nobody's business!!!
@@alwaystinkering3524 would be cooler if you had a charging system on that engine so you could regulate it down to what that glow plug wants (something like 1.2 to 1.5 volts DC)
The magneto can't generate anywhere near enough current to heat a glow plug since it was designed to create high voltage at very low current to fire the spark plug. But with the right setup, the glow plug wouldn't be needed anyways once the engine is warmed up because the heat from compression would auto ignite the fuel.
The diesel fuel is goin through the carb in the cylinder along with air and its getting compressed and ignited by the glow plug that he installed in the spark plug hole.
Lol nice try guys but this is not a diesel conversion its just a gas engine running on diesel fuel not enough compression to ignite the fuel as they barely make 120 psi at wide open throttle and diesel needs well over 200psi to even try to run
yep not a diesel. they run on compression not a glow plug. glow plugs can get them started. but once running there is nothing outside to fire it... sooooo nope not a diesel
What's the sense? Gasoline is way cheaper than fuel oil and kerosene. When kero was cheaper than gas, I owned a John Deere that started on gas but then would switch to kero.
There's not very much of a practical purpose. I converted one of my lawn mowers to diesel just as a challenge and it runs reasonably well on diesel once it's warmed up. I'm currently experimenting with various mixtures of diesel and used oil to see what works. So far, I'm up to a 50/50 ratio of used oil and diesel, which seems to be working well. It would be cool if I could get it to run on 100% used oil, but realistically that would only save a couple dollars a month compared to using gasoline. I just like the challenge of doing weird things like converting a gasoline engine to run on diesel or used oil.
Diesel does not ignite by spark, it ignites by compression, the compression of the air heats up the gas and combusts the fuel when it is injected. with that glow plug this is a sort of hot bulb engine where it doesn’t need as much compression because it has the plug as a heat source. This engine is impossible to time the combustion because it’s not fuel injected and it’s not spark ignited
@@pureprotein9597 Diesel is normally ignited by compression, but it can also be ignited by spark. I converted one of my lawn mowers to run on diesel and it will run whether the spark plug is connected or not, but the sound of the engine changes drastically when connecting or disconnecting the spark plug, so obviously the spark does something. In my case, I think using the spark advances the timing by igniting the diesel/air mixture before it would compression ignite and not using the spark retards the timing by allowing the fuel to ignite later in the compression stroke closer to top dead center.
compression much too low, it barely runs with no power other, it burns only the lights fractions of the fuel, the remaining is vapourized without contributing to the engine process, at least, increase the compression to say 12:1, your actual engine is about 6.5:1 so the head design should be totally revised. «On any diesel engine, the swirling of the air is of prime importance to burn completely the fuel so you should capitalize on swirling of the combustion air if you wish to improve that engine. Mercury marine have developped outboard engines for the use of government agencies that are spark ignited and burns diesel fuel so if you can find that info, this can be a good starting point for your project.
I think what would technically be more accurate is that this is a Briggs and Stratton that’s running on diesel fuel. It’s not actually a diesel engine, as it doesn’t actually have a fuel injector nor is it actually compression ignition. Functionally it’s a hot bulb engine, which is on its own more similar to a normal spark ignition engine than a diesel cycle one.
There is a huge market in California for these
I bet
I’m trying to build one because my neighbors keep trying to get me to go to electric, I’m going to diesel to make
Em mad
This is what happens when pot is made legal in a southern state!
Take the glow plug battery off. I doubt it's igniting by compression.
Its just helping. It’s still dieseling I can tell by the knocking noise it makes
@@joshmanis9860dieseling?
@@SumProject18 running like a diesel with just compression
I had an old rider that I built to beat on in the woods. It had an 8 horse Briggs that I rarely ran gas through. I had a little liter tank to hold gas, and a bigger tank with diesel. To start, all I had to do was turn the gas on and fire it up. After a minute I'd turn the gas off and turn the diesel on. It would always run smoother on diesel, just smoked a bit.
You should have been able to run karaseen like the old model T ford's
You don't have to go thru all of that. Start and warm the engine on gasoline. Drain the tank fill with diesel, back the mixture screw out 2 turns and she'll fire and run no trouble. You just have to start it on gasoline. Did this for years with my brush push mower to keep chiggers at bay.
That's how they used to run some tractors back in the day. Two tanks. Start up on gasoline, then open diesel tank first and close gasoline valve. Messy but cheaper.
@@yewwtooob Yes. Most older tractors could run on gasoline, diesel or kerosene. There was also a really cheap fuel called “distillate”, which was somewhere between kerosene and gasoline.
With a tiny bit more work you could install a 2nd fuel tank, one for the gasoline and the other for your distillate/K1/Diesel fuel.
I tried something like this years ago as a kid. Did the start up on gas then switched to No. 1 fuel oil (aka Kerosene). Engine ran ok on spark plug, but when i tried Diesel, it would die after gas ran out. Again, I didn't know how to modify anything at the time. Plus, there was no sense in it, because, even then, gasoline was still cheaper that Kerosene where i lived.
I've done that too, I have even mowed my yard with the spark plug disconnected once the engine was warmed up. Not much power and lots of knocking, but it got the job done.
If it wont run without the glow plug igniter, shave the head to increase compression., Diesel auto ignites with enough cpmpression. Really cool to see this. Super cool.
Awesome! I have gotten gas engines to compression ignite on kerosene (no spark or glow plug), I'm going to mess with that more when I have time. Here are some ways you might be able to improve this concept and hopefully get it to run without the glow plug once it heats up:
1. Run the engine hotter by covering the cooling fins, restricting cooling airflow, etc. Hotter cylinder temperatures will help the fuel auto ignite.
2. Get a very hot spark plug, preferably with a fine electrode. Even though you aren't using the spark, the hot electrode may be helpful. Insulating the outside of the spark plug with fiberglass to keep heat in couldn't hurt either.
3. Increase compression ratio by shaving the head and/or block as much as possible. Higher cylinder pressure will generate more heat on the compression stroke and help ignite the fuel.
4. Build a hot air intake by drawing air off the exhaust, head, or block. Hotter air into the cylinder will also result in higher temperatures during the compression stroke, again helping to ignite the fuel. The fuel will vaporize better in hotter air too.
What if it had a steel or copper fuel line coiled around the exhaust and it gets started on gas but when it warms up you turn a valve on to turn to kerosene or diesiel
@@adamssmallenginesgreat idea, just plumb the exhaust into the fuel tank while you’re at it 😂 or just leave sht alone?
@@_..-.._..-.._ diesel ignites at 1000degrees Fahrenheit so it wouldn’t ignite especially without air. All it would do is warm up the fuel so it doesn’t need as much heat to fire off when it gets in the cylinder. It has been done in the Great Depression on trucks when gas was rationed but kerosene was infinitely available so they coiled a line around the exhaust so it was heated up before going into the cylinder and that way there were gas engines “dieseling” or running on kerosene.
It's called a hot bulb diesel. Concept is over 100 yrs old.
The exhaust was pinched too much, I'm willing to bet it would have been running pretty good if you have the exhaust wide open
Are you just running it through your carb??? That’s cool as hell interested
Could not understand a goddamn thing but that’s cool
I know. I’ve got a hard time speaking clearly
I know. I’ve got a hard time speaking clearly
@@alwaystinkering3524 I’m just doggin on ya bro haha, sorry. I like the vid!
Add some heet water remover yellow bottle, keep the glow plug hot
Following! Explain more about it please?
I tapped a r/c glowplug into the head, and blocked off some of the cooling fins in the shroud. It will run on both diesel and light crude oil. on order for it to work the engine has to be warmed up with normal spark ignition, which it will start on ether. a choke was also used.
Next use that method convert a Gasoline car
Let's see how this thing was modified, that will be the proof in the pudding.
Everyone’s neighbor.
Did you "shave" the head to raise compression?
there is no ignition timing here, there is definitely knocking. the fuel injectors normally control ignition timing for diesels because diesel combusts as soon as it hits the glow plug. does run smoother than i would think tho, also i’m no expert. i have seen people run warm 2 stokes on diesel but i’ve never seen anything like this
Not all diesels have glow plugs. The fuel does not "combust" upon hitting it. The fuel combust under pressure. At TDC high compression combustion takes place. You are right it is not ignition. The constant power to the glow plug is needed to smooth the running of the lower compression gas engine
@@droopy-ny7rv your right, i just meant when it gets compressed and forced up against it, i should’ve said upon reaching tdc, but glow plugs do also control combustion to make sure it’s a consistent burn each cycle, so in modern diesels is that not how it works? obviously the mixture must be compressed too it’s not just the glow plugs “touching” it
Some modern diesel engines do not use glow plugs. Some Cummins have grid heaters and no plugs. Several diesel manufacturers run rail and injection pressure that is difficult for some to imagine. Thankfully there is no O2 in the lines. A neat device called a Polynesian fire piston always intrigued me you may find them interesting as well But like others have made reference to this engine has compression that is much to low for diesel. A normal diesel with glow plugs are only powered before start up. Some older engines have them in a side pocket that the fuel sprays onto on its way to the combination chamber. Lots of variables in design and pressure over the decades but that's why some will reliable start in sub zero temps and some need plugged into a heater to help with cold starts.
@OAKDALE Do you have any pictures or video of the glow plug install process? is this something a person could do with a drill press and some milling/drill bits in an afternoon?
Il vous faut un taraud adapté à la bougie de préchauffage (Glow plug), de pour pouvoir i' installer sur la culasse.
Battery doesn’t last long. So what happens when you run the spark plug? What happens when its under load? Neat trick but is it useful? How could you build more compression? Carbon the thing up? Different head?
It will run off the spark plug once it's hot enough
That's incredible!
Where did you buy the glow plug?
It's a glow plug for Radio Control (RC) model airplane engines. You can buy them at any RC hobby shop. He's leaving the glow plug starter on it because the gasoline lawn mower engine doesn't have enough compression to sustain proper ignition of diesel fuel even after the engine heats up to operating temperature. The engine needs the glow plug to be heated to burn the diesel fuel which is why he has to put a fresh battery in the glow plug starter. It's fun, but will eat up batteries like nobody's business!!!
radio control plug
@@alwaystinkering3524 would be cooler if you had a charging system on that engine so you could regulate it down to what that glow plug wants (something like 1.2 to 1.5 volts DC)
did you restrict the exhaust for more compression?
haha i think so
More likely to breath less of the unrefined toxic smoke that has cyanide and other delicious compounds in it. 😂
I wonder if you can run a jumper wire from the spark plug boot to the glow plug and save on batteries?
The magneto can't generate anywhere near enough current to heat a glow plug since it was designed to create high voltage at very low current to fire the spark plug. But with the right setup, the glow plug wouldn't be needed anyways once the engine is warmed up because the heat from compression would auto ignite the fuel.
Yeah; and then put the spark plug back and fill it up with gasoline, I bet it runs 100% better 😂
please tell me, how it's work with out the injectiin system ?
The diesel fuel is goin through the carb in the cylinder along with air and its getting compressed and ignited by the glow plug that he installed in the spark plug hole.
This will only work if the petrol has methanol inn it
Just let it warm up them when it about to run out of Gans then fill in diesel
Why? More complicated than running gas! You can run diesel after you warm up with gas anyway
Has it got a carberator and is diesel?
so show us how you did it
You can't throtle it ?
Chooching
where is the injector ?
its carbureted the carburetor just makes the fuel a mist like an injection pump
Vacu-jet. Long time Briggs and Stratton thing.
Lol nice try guys but this is not a diesel conversion its just a gas engine running on diesel fuel not enough compression to ignite the fuel as they barely make 120 psi at wide open throttle and diesel needs well over 200psi to even try to run
yep not a diesel. they run on compression not a glow plug. glow plugs can get them started. but once running there is nothing outside to fire it... sooooo nope not a diesel
What's the sense? Gasoline is way cheaper than fuel oil and kerosene. When kero was cheaper than gas, I owned a John Deere that started on gas but then would switch to kero.
There's not very much of a practical purpose. I converted one of my lawn mowers to diesel just as a challenge and it runs reasonably well on diesel once it's warmed up. I'm currently experimenting with various mixtures of diesel and used oil to see what works. So far, I'm up to a 50/50 ratio of used oil and diesel, which seems to be working well. It would be cool if I could get it to run on 100% used oil, but realistically that would only save a couple dollars a month compared to using gasoline. I just like the challenge of doing weird things like converting a gasoline engine to run on diesel or used oil.
What in tarnation
Not really a true diesel for one reason those are low compression engines, two there's no injector or injection pump.
different
Why not keep the sparker plugged in?
Diesel does not ignite by spark, it ignites by compression, the compression of the air heats up the gas and combusts the fuel when it is injected. with that glow plug this is a sort of hot bulb engine where it doesn’t need as much compression because it has the plug as a heat source. This engine is impossible to time the combustion because it’s not fuel injected and it’s not spark ignited
@@pureprotein9597 Diesel is normally ignited by compression, but it can also be ignited by spark. I converted one of my lawn mowers to run on diesel and it will run whether the spark plug is connected or not, but the sound of the engine changes drastically when connecting or disconnecting the spark plug, so obviously the spark does something. In my case, I think using the spark advances the timing by igniting the diesel/air mixture before it would compression ignite and not using the spark retards the timing by allowing the fuel to ignite later in the compression stroke closer to top dead center.
compression ratio?
For these flat heads it’s 6.5 to one
compression much too low, it barely runs with no power
other, it burns only the lights fractions of the fuel, the remaining is vapourized without contributing to the engine process, at least, increase the compression to say 12:1, your actual engine is about 6.5:1 so the head design should be totally revised.
«On any diesel engine, the swirling of the air is of prime importance to burn completely the fuel so you should capitalize on swirling of the combustion air if you wish to improve that engine.
Mercury marine have developped outboard engines for the use of government agencies that are spark ignited and burns diesel fuel so if you can find that info, this can be a good starting point for your project.
Old Smokey