[James92Scort]

Ok I´ve been thinking about something here, how the f*** can you turbo a diesel? I know how diesels work, you don´t have a spark plug, the fuel and air ignite at TDC without a spark. so how can you put more air/fuel in there without pinging? unless you have to retard the timing on the cams? I still don´t see how it´s done. someone hit me back with any possible explanation, or a website that would help me out. Thanks.

 

[89GT]

On a diesel intake stoke just pulls air in compression stroke it compresses that air, power stroke fuel is introduced and from the heat of the compressed air it is ignited, then the exhaust, it just forces more air in the cylinder. Just compare a 7.3L non turbo to a 7.3L power stroke they make alot of torque.

Curtis

 

[James92Scort]

so the powerstroke fuel is just introduced into the chamber after the air has been compressed? I think I see now. Thanks.

 

[Pimp_scort_89_GT]

Also the more air that is being compressed, the higher the compession will be and the better it will be able to burn the fuel. As far as the pinging goes.... Pinging happens when your fuel ignites before the spark plugfires which causes the two flame fronts to colide and cause pinging. Diesel engine dont have sparkplugs, so the only flame front present is the one cause by the high compression. If you could turn your spark plugs off in a situation that would cause pinging, you wouldn´t get the pinging, you would then be dieseling.

 

[James92Scort]

Well the way I´m thinking is when you add more air into a cylinder it raises the temp/compression so therefore when you introduce the diesel it´d detonate before TDC.

 

[TheBlade]

Well do remember a diesel uses Glow-plugs. So its not void of a detonation condition (pre-ignition condition). But yeah forced artificially raises the compression ratio. The cool part about diesel is you can run higher ratio´s. That´s why a 350 chevy running gas stock can put down like 300 hp and 340ft-lbs (number I pulled out of my butt for example) but running the 350 as a diesel in a Peterbuilt you can get 400hp and 850ft-lbs. If you weren´t aware, when refineries are seperating the grades of fuel by where they seperate in the tanks, if they cut a batch of Jet-A and its a little on the low side they sell it as Diesel #2. Diesel and Jet fuel are really resistant to detonation...that´s why compression ratio´s in diesels can be like 30:1 instead of 9:1 like in our GT´s. Actually, the big Volvo diesels that you see going down the road...if you listen you can hear the turbo spooling like mad. Believe it or not some of those big Volvo´s that cost 500k bucks are pushing like 65psi.

I almost forgot the best thing about diesel ----- Propane injection! Its like N2O in gas. Best part is you can fill it up in any little hick town, it costs next to nothing, and no cop would give you crap for having a 50lb propane tank in your vehicle.

Makes you think twice about that old 80´s VW Rabbit Diesel huh? Besides alot of European cars are diesel because of the gas mileage. Gas is like 5 bucks a gallon in most places.