Operation of Jumo 205 Type Briggs Engine Explained

[sandsifter149]

What the hell was that noise at about 1:10 ?

[ChargerMiles007]

@sandsifter149

Sorry, I didn't hear a noise at 1:10, but at 0:59 it is a Deltic starting up ( borrowed from youtube), before that it is a Deltic powered train going by at station at high speed :)

[gary66669]

looks like you lose all the oil out of the exhaust side form the exhaust holes

[ChargerMiles007]

@gary66669

Yes, some oil comes out the exhaust ports. The reason it was SO smokey when I started it, was that oil got into the intake manifold when I tipped it over to re-install the supercharger drive chain. I got out what I could, but apparently there was still lots left in there. I am surprised it didn't foul the spark plug!

[realvanman1]

This is really cool!

The supercharger is actually a scavenging blower, but it is very nice to see that you've ground a new cam for it, allowing it to operate strictly as a pump, skipping compression and power strokes that the original cam would have provided.

I think it would have been cool to have had two mags and two spark plugs, just because you could, with the two flywheels... Don't know how much difference it would make, but some engines had dual mags and two plugs per cylinder...

[ChargerMiles007]

@realvanman1

Yes, you are correct, it is indeed a scavenger, I just call it a supercharger so most people will stand a better chance at understanding what it is doing.

Dual spark plugs would be an idea, one thing to note though, is that the exhaust piston leads the intake piston by about 20 degrees, so seriously offset flywheel keys would be required. I used 1 plug just for simplicity, plus that way I knew the intake piston was near the top, since that block has the magneto on it.

[realvanman1]

@ChargerMiles007 Ah, I had assumed- and you know what they say about that- that the exhaust lead was accomplished by drilling the exhaust ports a tad higher in the cylinder. So this means that they must also close 20 degrees before the intake, if I'm understanding correctly? So you actually could develop a bit of boost in the cylinder, assuming the scavenger pump is of large enough displacement... Too cool!

[ChargerMiles007]

@realvanman1

Man, this is too weird, I went to look at your channel, and it is like it doesn't exist!

Are you like under YouTube Witness Protection, or something!!!! :)

HaHaHa lol :)

[realvanman1]

@ChargerMiles007 LOL! Really? I'll have to check into that! I've only got a couple of videos on there, I'm not much of a videographer (sp?)...

[ChargerMiles007]

@realvanman1

Yes, it is too strange, and it still does it!

It just says "This channel is not availible", and displays a bunch of other channels.

You sure you aren't Under Cover!!! :)

[realvanman1]

@ChargerMiles007 Huh, I logged out, found one of my videos, clicked on my user ID, and got the same message, "This Channel is not available". Weird. So I logged in, found the link for "Privacy Settings", and when I clicked on it, it said "information not available"! Perhaps I am living in.... THE TWILIGHT ZONE.... Which I think was a pretty cool show...

[ChargerMiles007]

@realvanman1

Yes, the Twilight Zone was cool :)

Hope your channel doesn't bite the dust, or something!

I have been having some issues answering comments the last week or so.

Generally I try to respond to all comments :)

If these problems persist, Zontaar might have to make a vid about them! :)

[labrieexpert2000]

the supercharcher is a engine or what?!

[ChargerMiles007]

@labrieexpert2000

Yes, a modified engine, so a valve is always open. It is basically an air compressor now, flowing a gasoline/air mixture to the 2 power unit engines. a small Roots supercharger would be a lot smaller, but I didn't have one back then, lately I have rescued 2 from Detroit diesel truck engines.

[eshizz89]

fuck man you can do just about anything with a tube of JB

[ChargerMiles007]

@eshizz89

HaHaHa!!!! :) You have a point there!

[eshizz89]

@ChargerMiles007 when i was a kid that is all me and my buddy used to repair our minibikes, even patched up a couple cases on various dirtbikes. i found a product that works a little better for certain materials. it is called "pig putty" comes in a tube. check it out.

[eshizz89]

@ChargerMiles007 it is a two part resin/hardener you knead, dries hard in about 3 minutes.sandable paintable. doesnt have as much flex as jb so it will crack on a part that moves and flexes a little bit.

[ChargerMiles007]

@eshizz89

Oh yes, I use JB Weld, I used almost a full tube on my 8 horse supercharger head for this, the black engine, to increase the compression ratio, since it isn't exposed to flame.

[HayLotion]

My pc fan looks like that.

[tpvalley]

the exhaust ports open early for the reason u say but mainly so they can be closed early while inlet ports r still open, this way u can have higher supercharger pressure without just wasting it out of exhaust this is main reason for non symetrical exhaust timing. loop scavenge engines can have a second row of inlets above normal inlets that r controlled by one way or reed valves so that air flows only after exhaust ports r closed on the up stroke for same effect.

I helped with deltics as a lad.

[ChargerMiles007]

@tpvalley

Howdy, that is cool that you helped work on the Deltics!

I wish I could have a look at one of those some time, but most are in the UK.

I saw a Junkers Jumo 205 diesel aircraft engine at the Ottawa Aviation Museum, thats what gave me the incentive to built this engine. I will pull it out one day soon, and run it for longer.

Thanks for your messages, I appreciate you taking the time.

I am working on a poppet valve 2 stroke at the moment.

Miles

[tpvalley]

@ChargerMiles007

u have the fairbanks and morse diesels with opposed piston engines.

[ChargerMiles007]

@tpvalley

Yes, that is true, there are the Fairbanks-Morse diesels, I have never seen one of those.

I grew up with a main line train track bordering our backyard, so I imagine I have heard them run, and didn't know it. I really like the unique sound of a Deltic running!

[dgdaner]

I'm sorry i got that wrong a ex vw guy i think his name is hofbauer is making one in a company called ecomotor the links are on my channel for some reason I can't put them in a comment

[dgdaner]

vw is making a opposed piston engine that is two cylinder 4piston 300+ hp! It is still in testing but it looks awesome

[ChargerMiles007]

@dgdaner

Thanks for letting me know about that, I will have a look for it! :)

[dgdaner]

@ChargerMiles007 the first html is from autoevolution . com the second one is youtube. /n ews/opoc-engine-explained-2260 9.html

and watch?v =5Y8QqeuvArE

[novachevyguy]

cannucks !!! what will they waste their time on next????

[ChargerMiles007]

@novachevyguy

Making the noisiest 9 cubic inch Briggs lawnmower on the planet!!!! :))

I built this engine, since I was so impressed with a real Junkers Jumo 205 engine that I saw in a museum, I thought it was a cool design concept.

[iwasapenny]

Instead of using a separate engine as the supercharger, why not use a smog pump? Ive seen them used as superchargers on several Briggs go kart engines. It would be a lot more compact and efficient, and might reduce the amount of vibration.

[ChargerMiles007]

@iwasapenny

That is a good idea, I haven't actually seen a smog pump in a long time at a wrecking yard here, but cars don't last as long near the Great Lakes, since they have to salt the roads to deal with the ice. It wonder how you would know the output of the smog pump in cfm or a similar measurement?

[mightyfinejonboy]

have you looked at The Scuderi Cycle ,looks interesting i saw it on the jalopnik site.

keep up the good work.

regards jon

[ChargerMiles007]

@mightyfinejonboy

No, I haven't heard of that one, I will have to check that out!

[robinhooodvsyou]

"So this guy over here, he is my supercharger", sounds funny, keep it going !

[ChargerMiles007]

@robinhooodvsyou

HeHe, I guess I talk like that without even knowing it!

Guess it shows I am a true motor head :)

[1972FordF150]

This thing is interesting and cool !

[ChargerMiles007]

@1972FordF150

Thanks dude :)

[NASTYTHEBOY]

so which crank do you harness powerfrom in a real application!?

[jvanderman]

this is a very interesting piece and its got my brain thinking so thank for maki!n this

[ChargerMiles007]

@jvanderman

You are welcome, I just like making engines from the past that operated differently than ones that most of us are familiar with these days. It shows that there is more than one way to skin the cat, so to speak.

[gpzDave]

Ah so if it wasn't supercharged then the engine wouldn't run due to where the ports are loacated, cool!

[ChargerMiles007]

@gpzDave

Yes, that is correct, you have to have some type of air pump to make this engine run.

[NightTurkey82]

I cant help but notice that you are using nearly a 1:1 ration from your supercharger to your other engine, by the time the exhuast valve opens and bleeds the pressure to the intake of the firing engine, you have lost most if not all pressure, and may even be pulling vaccum. I would overdrive the supercharger, maybe a 2.5 or 3:1 and try that. But then again, you built it so i might not know something about the build that you do.

[ChargerMiles007]

@NightTurkey82

I try to time the supercharger so that the pressure starts to build up just before the inlet ports open in the 2 stroke.

I only drive it at 1:1, since I don't want to over-rev the big riding mower engine.

Thanks for the advice, it shows that you were pauing close attention to the vid! :)

[MRkallek91]

1 views. FIRST! hhahaha

[ChargerMiles007]

@MRkallek91

WooHoo, you got the first view, and comment! Congrats! I love it when I do that, it is always a neet thing!

I hope this vid helps explain how this beast works, since I know it is far from a normal engine!