What's the biggest Diesel

[Dr.Evil]

MATT - Your right, The air plane engine is a glow plug ignited 2-stroke that burns a mostly alcohol fuel, with yp to 50% nitro methane and about a 16 to 20% blended Castor Bean/synthetic oil for lubrication. The planes are real east on engines, and most are really low performance. The glow powered Car racing engines are at leat twice the HP of the plane engines and most rev to 30,000 to 40,000 RPM. over 1 HP from a . 129 CID or 2-1/2 HP from . 21 CID are typical. But some company had a conversion head for OS . 12 sized engines that repaced the glow plug with a screw that varied the compression, and a few other things and the engine became a true diesel, ran of a special diesel based fuel. And as you would expect, ran cooler, GOBS of low end torque, and blew the Glow Engines away!

DENNY... ... ... ... ... ... .

 

[Wheaties]

Denny,



Now I see what you're getting at. The last time I played with model airplane engines, a . 61 CIN developed just over one horse. If I have that right, this would mean the engines you are talking about are three times as powerful per CIN. That's pretty incredible. I suspect they weigh considerably more? That always seemed to be the limiting factor when I was into modeling. That, and KISS.



I would argue that glow engines are technically diesels (the glow plug is really only for starting) because they are compression ignition regardless of the fuel. But if you're saying the engines you describe are 'real diesels' as in 'Cummins is a real diesel' then I take your point.



Matt

 

[Dr.Evil]

Matt - Yup, The car engines are pretty awesome! Still a multiport 2-stroke. Most have 4 ports, an intake, exhaust & 2 transfer ports. The . 21 cid car engines have 6, 7 or as many as 9 ports. ALL glow plug type, with different heat range plugs. Only moving parts are the crankshaft, rod, and piston, but are considered a rotary port engine since the carb feeds the engine thru the hollw crankshaft. OS even makes radial, twins, and a WANKEL engine. Also a bunch of 4-stroke engines out there too. Still run with glow plugs. We have one of the first NOVA ROSSI Top . 129 cid engines they shipped into this country 2 yrs ago. produces about 1. 1 HP at 32,000 RPM, idels at 3000. Our . 21 CID OS RZ-B 99 Edition is rated 2. 3 or 2. 4 HP at 32,000 RPM, top speed is 38,000 RPM, idels at 3000. Plane engines are usually all less than 10,000 RPM, Ducted Fan plane engines are about as hot as the car engines. R/C Helicopter engines are torquey and rev higher than planes. But the Insane Bomber engines are the Boat guys. Water cooled heads, Car engine RPM, and about twice the HP as the car engines. Biggest weak spot in the glow engines is the con rod. Boat guys break the rod every time they race the boat.

Then there's the diesel. I don't think it's made anymore, but several magazines I had said they were pretty stout. Fuel was about $8 Qt. insead of $30/Gal. like the glow fuels. If You haven't been around the hobby for a while, Tower Hobbies Web site should catch You up. I think in less than 5 more years they will have fuel injection, for performance reasons. Already have traction control, anti-loc brakes, multi-speed transmissions, On-board telemetry for engine temp, RPM, etc. All on a vehicle just over a foot long?

DENNY... ... ... ... ... ...

 

[Blakers]

Okay, I have to ask. Is it really a diesel if it burns diesel fuel, but the fuel fires a boiler?

No, it just has an oil-fired boiler. A diesel engine is an internal combustion engine that relies on the temperature from compression of air for ignition of fuel that is injected into the combustion chamber. Really the fuel burned does not matter in defining as a diesel, just the basic process of operation.



Early semi-diesels were built in the early 1900s-1920s that used injected fuel, but relied on a hot tube or hot bulb for ignition. The hot tube being a nickel tube heated by an outside flame that compressed air in the cylinder would be shoved into by the piston. The hot bulb being an external appendage to the combustion chamber that would be initially heated by an outside flame, but once the engine was running, would retain heat for ignition from the heat of combustion.



Hope that helps.



Blake

 

[Wheaties]

Blake,



I'm inclined to agree with you. I always thought it was the nature of the combustion process that made/excluded it as a diesel. But the way this thread was going, I was beginning to wonder.



I did a search after I posted Friday, and found mention that the diesel in the QE II was some 130,000 bhp's, but I haven't substantiated it as yet. Does anyone have a copy of the Guinness Book of World Records?



The Sulzer's are definitely big. I also ran across a few MAN B&W's (did I get that right?) that definitely seemed to be in the same league.



It seems that if you need an engine with more power in this league, they just add another piston. You can imagine talking to an engineer for one of these babies, "Well my 'cylinder count is pretty low actually, but 9 of them are bigger than my car... . "



--Matt

 

[Dennis Garrett]

Getting back to the JFK for a minute. My oldest son is a Helicoptor pilot on the "O'Bannon" (DD-987), a Navy destroyer based in Mayport. (Jacksonville, FL) In Nov. and again in May, I got to go along for a few days as the ship was returning to Mayport. Both times, the JFK was tied up there, having a new flight deck & other work done. It's the only carrier I've ever seen, (twice) and it's interesting anything about it would show up here!

 

[ETOBICOKE]

Tiny Model Arcraft Diesel

I have a minature reproduction of a 2 stroke Brown Diesel, 0. 250 bore by 0. 350 stroke. That should make the displacement about . 017 cu. I haven't run this one myself, but have seen the prototype of it run. I have raced with Nelson 2. 5cc 2 stroke diesels in control line scale racing events. They are definitly much harder to operate for several reasons, the compression and fuel mixture have to be changed as the engine warms up, prop selection is very critical to good performance, fuel quality can very, changing atmospheric conditions.

Model Diesels run on a mixed fuel aprox 30% either, 8-20% castor,1-2 amyle nitrate and the ballance is kerosene. Most of modelers who run diesels mix their own fuel, usualy it's kept refrigerated to stop the either from evapourating. The hardest part is obtaining small quantities of either, years ago it was available from the local drugstore, now we have to buy 5 gallons at a time.

In the hands of an experienced modeler these little diesels will generaly perform as well as a comparable glow engine of the same displacement.



Neil



Diesel Model engines: clockwise from top, 2. 5cc team race engine from China, 2. 5cc MVVS RC engine, Miniture Brown Engine, 2. 5cc Russian sport engine

 

[hammersley]

Diesel Outboards

Check out this site for diesel outboards.....



http://www.woodenboatshop.com.au/yanmar/outboards.htm

 

[hammersley]

Check out this site for diesel outboards.....



http://www.woodenboatshop.com.au/yanmar/outboards.htm

 

[hammersley]

Sorry about the double post and forgot this one...

http://www.landseapower.com/diesel.htm

Now we can be noisy when fishing... ...