If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#11
|
|||
|
|||
Don Stauffer wrote:
Don Stauffer wrote: A 4-stroke diesel is still an Otto engine. An Otto cycle engine is one with four strokes, intake, compression, power, and exhaust. Doesn't care whether SI or CI. Whoops Before everyone jumps on me, I left off an important qualification. I was specifically talking about cars, airplanes and highway trucks. Large Diesels, (stationary, large ship, etc) do run a different cycle- the true Diesel cycle. However, even the true Diesel cycle of larger engines is not the true cycle Diesel really wanted. He couldn't develop the true cycle he wanted (constant enthalpy), and a large Diesel comes somewhat close. A high speed (vehicle) engine doesn't even come close with even today's technology. It is pretty close to an Otto cycle, though still not exactly. Otto cycle has infinitesmal fraction of cycle for ignition and burn, while even a high speed Diesel (and even the SI engine) still ignites and burns over a finite angle of crank rotation. Still, the result, as I say is MUCH closer to Otto than the cycle Rudy had intended. Still makes a good engine, however :-) I pretty much agree, although today's high-speed diesels are doing a lot better at approchin the constant-enthalpy cycle than they used to, thanks to being able to divorce the injection profile from crankshaft position via electronically-controlled injection systems. |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
2-stroke diesel is the (near) future? | Max Kallio | Home Built | 134 | July 18th 05 12:39 AM |
BSFC vs gas mileage, 2 stroke vs 4 stroke | Jay | Home Built | 10 | August 24th 04 02:26 PM |
Diesel Jodel information..........and .........diesel plane groups | Roland M | Home Built | 1 | January 4th 04 04:04 AM |
Diesel engines for Planes Yahoo Group Jodel Diesel is Isuzu Citroen Peugeot | Roland M | Home Built | 3 | September 13th 03 12:44 AM |
Diesel engines for Planes Yahoo Group Jodel Diesel is Isuzu Citroen Peugeot | Roland M | Rotorcraft | 2 | September 13th 03 12:44 AM |