I want to put an injector on SI type engine. Give it an electronically controlled injector. I cant alter stroke and compression ratio. Just want to know if diesel will ignite properly. I am putting centrifugal supercharging for increasing the volumetric ratio and want to make it able to run on gasoline, diesel, and if possible E85. This will be done on a 2 wheeler for my college's final year project. Please kindly help!!!!!!!!!!!!!!!!!!!
You can give better ways too.
2007-08-08 00:34:24 · 7 answers · asked by aloktheautomaniac 1 in Cars & Transportation ➔ Motorcycles
I'm not a mechanic, but I'm afraid your idea won't work... You can't make a gasoline/diesel hybrid imo, they are too different.
For gasoline, a spark is enough to ignite. LPG (Liquid Propane Gas) and ethanol are very similar too gasoline. For LPG, you don't even need adjustments in your motor, just a specially designed fuel tank.
Diesel is completely different. It requires high compression to allow self-ignition (you don't want that in your gasoline engine). Diesel engines are far more complex than gasoline engines.
2007-08-08 01:12:26 · answer #1 · answered by JohnyD 3 · 1⤊ 0⤋
cas marti was right on the money except for one tiny exception, diesels ignite when the fuel injector injects the diesel fuel into the compressed air inside the cylinder. In short, gas engines compress a fuel-air mix and then ignite it with a spark, diesels compress air and ignite that by injecting fuel. Incidently, in many pre-60's industrial diesel engines (International bulldozers for example) had the diesel injection equipment on one side of the engine and a carb and spark plugs on the other. Big engines were hard to start in cold weather, so those engines would start on gasoline and once running, were switched over to run on diesel. So actually, your idea isn't as far fetched as one would think except it's already been invented!
2007-08-08 09:35:14 · answer #2 · answered by bikinkawboy 7 · 1⤊ 0⤋
No, you're trying to get two different types of engines to work on the same parameters. Uh-Uh! Diesels ignite on compression; gas engines ignite on spark. A gas engine, even with supercharging,(centrifugical or Rootes), starts with a static ratio of approx. 8-8 1/2 to 1. Depending on the fuel, boost can go as high as 16- 30 PSI. Diesels usually start at a static ratio of at least 16 to 1, depending on whether it's a 2 -stroke or a 4-stroke cycle engine. Detroit Diesels are a two stroke to start & the Rootes type "blower" is necessary to make 'em work. Then to make more power you can add turbochargers. Biggest I ever saw was a V-16, with two 8-71 blowers(hey, go figure), & 4 turbos. Awesome even on the stand, prit neer 8 ft. long. Other diesel engines, like a Cat, push compression ratios past 22 1/2 to one. See the fallacy in the thought of having an engine that could do both? You'd need #2 diesel for the one side, then gasoline over 130 octane for the other, not to mention all the hardware on the top of the cylinder to make 'em both work w/o screwing each other up. Nice in dreams, but, not practical in life.
No, bikinkawboy, they called them "pony motors". Usually a Wisconsin V-4(air cooled). After you'd started the pony & let it warm up, then you'd engage the clutch to the main engine to turn it over for a start. Needed the pony because it was a big Cat engine(approx. 7 1/2-8 ft. long; 8-9" dia. pistons; I-6)& you needed the 60HP of the pony just to turn it over. ( & I took it as a 'gimme' that he knew the principle of diesel operation).
2007-08-08 08:27:23 · answer #3 · answered by Anonymous · 1⤊ 0⤋
Just Using Spark to Ignite diesel in SI engine will not ignite will not work . This is because the Flash point will be acheived by spark from a Spark Plug . As you are not increasing the compression raion , the temperature of the mixture will be not enough even though you are trying to ignite with a spark plug. There are other reasons as well .... which we can discuss but it is beyond the scope here.
2007-08-09 14:23:49 · answer #4 · answered by CAR TRAVELER 2 · 0⤊ 0⤋
The only clothing guaranteed not to fit is "one size fits all." Same is true of multi-fuel engines. Making an engine that runs on anything, even if technically possible, would result in incompatible compromises. You may actually get the proposed engine to work, but it would guaranteed be terrible in all but one mode, and it would probably be terrible in all modes.
2007-08-08 09:54:24 · answer #5 · answered by Yesugi 5 · 1⤊ 0⤋
The military has been using multi-fuel engines in trucks for years. You can research how that's been done for yourself.
The biggest problem will be scaling down to a two wheel vehicle.
2007-08-08 11:21:30 · answer #6 · answered by yeochief2002 4 · 0⤊ 0⤋
forget it it won't work
2007-08-08 09:36:40 · answer #7 · answered by 51 6 · 1⤊ 0⤋