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Re: Why does a lean engine run hot?
OOoh, i finally figured what system you guys are talking about, you guys are talking about EGR systems that are or rather can be used for throttle management.... yes you can have no air restriction valve.. the thing is you still limit your air intake by controling the amount of exhaust gases you recirculate into the intake, you are not doing this by physical means, but you are restricting air flow still
sheesh i thought i was going crazy here...
it is infact not a very very common system, that's why i couldnt get what in the world you guys are talking about, and yes it does happen on some bigger diesels and some gasoline engines, if implemented properly it may increase the efficiency in a couple of areas, and diesels do benefit from it quite a lot, yes, though it limits their power. The new Jetta TDI's have this system if i'm not mistaken, my dad's has an earlier EGR system, while it recirculates the gases, it is not the sole means of controlling air intake, and still has a butterfly valve, but with proper ecu software, you can eliminate the need for the valve, yes... once again, you do loose power by decreasing the specific heat of a power stroke with exhaust gases though, so while some cars have this, not all cars do...
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