direct injection engines

[kachok25]

Could direct injection technology eliminate detnation problems in gasoline engines? After all you cannot detonate what is not there yet if gasoline in injected near top dead center it could only be burnd at the rate it is injected. this could be used to raise compression ratios or boost leavels in racing engines if I am not mistaken. The only problem that I could think of is the inability to create a completly homogenous mixture with direct injection (not enough time to completly vaporize the fuel), but I would think that it would be more than offset by the increased boost and or compression. However I do think that it would be difficult to pass emissions if you wanted to use it in a street legal engine. Someone give me your thoughts on this, it sounds logical to me but I am not sure how well it would work.

[Reed]

well most gasoline engines start the burn some degrees before TDC. so detonation could still be a problem. other than that it sounds like a good idea to me.

[CraigFL]

What you say is true but everytime anyone makes a major change like this, there will be problems -- pre production, early life and long term. There are also tradeoffs. When you want to force a technology change like this, development comes over a period of years. Auto makers are reluctant to jump into new ideas like this without significant development time.

[kachok25]

oh I am not saying lets force it down everybodys throat, or that it will change everything overnight, I was just checking if my theory was sound, and worth experementing with.

[Alastor187]

Originally Posted by kachok25

Could direct injection technology eliminate detnation problems in gasoline engines? After all you cannot detonate what is not there yet if gasoline in injected near top dead center it could only be burnd at the rate it is injected. this could be used to raise compression ratios or boost leavels in racing engines if I am not mistaken. The only problem that I could think of is the inability to create a completly homogenous mixture with direct injection (not enough time to completly vaporize the fuel), but I would think that it would be more than offset by the increased boost and or compression. However I do think that it would be difficult to pass emissions if you wanted to use it in a street legal engine. Someone give me your thoughts on this, it sounds logical to me but I am not sure how well it would work.

You would probably be interested in what Audi has done with their R8, here is link discussing the benfits of their direct injection system:

http://www.audiworld.com/news/05/lem...s/062505.shtml

[Schister66]

the only problem is that you're going to have to put the gas under a lot of pressure like they do in diesel vehicles and that makes them harder to work on.....

[Moppie]

Mitsibushi have been buidling direct injection petrol cars for about 10 years now, but only selling them in the Japanese Market.
That changed about 5 years ago, when certian models became avliable in limited numbers in overseas markets.
The Technology is now slowly making its way into thier entire model range here in NZ, and Im sure it will reach the rest of the world soon enough.

[kachok25]

Originally Posted by Alastor187

You would probably be interested in what Audi has done with their R8, here is link discussing the benfits of their direct injection system:

http://www.audiworld.com/news/05/lem...s/062505.shtml

thanks for the link I guess that I had the right idea, now I would love to see what they could do with that on a turbocharged street car without Le Mans rules.