Propain injection
Veteran
Joined: Mar 2004
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RE: Propain injection
Since were off topic, I got a better one. Water injection. In the tractor pull's some guys would inject water, when it turns to steam or something it really expands, not really sure of this, but there are wierder things out there. And yes, I have heard of propane for diesel, used to own a jetta diesel, and everybody said, put propane on it?!?! I don't think it really works.
Captain
Joined: Mar 2004
Posts: 659
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RE: Propain injection
Water injection is pretty sweet, actually- we've used it on airplanes for years (mostly turbines, though). It doesn't really apply to turbos, though.
The way it works is that water is injected into the combustion chamber with the fuel/air mixture. Since water as a liquid does not compress it effectively decreases the volume of the chamber (since it occupies a non-compressible space) thereby increasing compression- when the gas expands you get the area of the expansion plus the area of the water which never compressed in the first place- basically, you increase the force of the explosion. That's a pretty simple explanation, but that's the basics of it.
So anyway, since turbos run such high pressure anyway, water injection really isn't used. I guess it could be, but you'd need a pretty beefy engine. I myself certainly wouldn't do it on the SRT.
But, as always, that's just my take (I should just put that in my sig).
The way it works is that water is injected into the combustion chamber with the fuel/air mixture. Since water as a liquid does not compress it effectively decreases the volume of the chamber (since it occupies a non-compressible space) thereby increasing compression- when the gas expands you get the area of the expansion plus the area of the water which never compressed in the first place- basically, you increase the force of the explosion. That's a pretty simple explanation, but that's the basics of it.
So anyway, since turbos run such high pressure anyway, water injection really isn't used. I guess it could be, but you'd need a pretty beefy engine. I myself certainly wouldn't do it on the SRT.
But, as always, that's just my take (I should just put that in my sig).
Legend
Joined: Jul 2003
Posts: 9,543
Likes: 2
From: United States
RE: Propain injection
Here's a simpler explanation: it raises the compression ratio.
Slightly Off Topic: If you put water in a old Windex bottle and spray it into the intake/throttle body/carburator, while the car is running and you can operate the throttle at the same time to keep it running, it will steam clean the valves and knock off any carbon deposites. This is an old trick that happens to work well. I have used this trick on my Roadrunner before. I first used Gumout Carb and Choke cleaner until the exhaust blew out clean, then I used the water trick and you should have seen all the black smoke that came out of it, it looked like an old diesels exhaust. I used the water spray until it blew clean, so I know it works for a fact. I had read of this trick in Hot Rod magazine several years ago as well. I don't recommend that anyone does this on their SRT-4 unless they have driven around 10K miles or more without an oil catch can, then you may want to try this to clean up the valves that are probably cruded up from the oil blow-by. Also try this if you have an older carburated car, it will thank you.[sm=smiley2.gif]
Slightly Off Topic: If you put water in a old Windex bottle and spray it into the intake/throttle body/carburator, while the car is running and you can operate the throttle at the same time to keep it running, it will steam clean the valves and knock off any carbon deposites. This is an old trick that happens to work well. I have used this trick on my Roadrunner before. I first used Gumout Carb and Choke cleaner until the exhaust blew out clean, then I used the water trick and you should have seen all the black smoke that came out of it, it looked like an old diesels exhaust. I used the water spray until it blew clean, so I know it works for a fact. I had read of this trick in Hot Rod magazine several years ago as well. I don't recommend that anyone does this on their SRT-4 unless they have driven around 10K miles or more without an oil catch can, then you may want to try this to clean up the valves that are probably cruded up from the oil blow-by. Also try this if you have an older carburated car, it will thank you.[sm=smiley2.gif]
