Quote:
Originally Posted by RH77
Our TSX has NO EGR... so what does that mean? It has the i-VTEC system that variates the cam timing.
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If a manufacturer has fine enough control over the exhaust valve timing/lift they can effectively keep some exhaust in the cylinder, which is usually called internal EGR. This is much nicer than older systems since there's no need to run a separate line from the exhaust to the intake and alla that provided there is enough control over the amount of exhaust left over from the last stroke. Restricting the exhaust pipes will also result in more exhaust staying in the cylinder compared to stock/normal, in other words more exhaust gas recirculation/staying in the cylinder for the next combustion event.
Quote:
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Originally Posted by Acura
EGR Effect
At moderate engine speeds, i-VTEC advances cam timing for increased valve overlap, creating an internal exhaust gas re-circulation (EGR) effect. At the same time, the lift of one intake valve is reduced to achieve a strong swirl effect in the combustion chamber. The combined swirl effect and internal EGR effect provide for a highly efficient combustion process - so efficient that there is no need for an EGR valve to recycle exhaust gases, further enhancing the engine's clean burning performance.
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From earlier in the thread...
Quote:
Originally Posted by Coyote X
From what my camaro ran like during the brief time I had restrictors duct taped over my exhaust it made it run good at low rpms. The other guy who tested them noticed his car warmed up a lot faster with them on.
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Quote:
Originally Posted by MetroMPG
The fastest warming car I've ever driven was a Mitsubishi 2.0L (I think - whatever the motor was in the Talon/Eclipse/Laser).
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I bet the Mitsu was turbocharged.
Quote:
Originally Posted by Frank Lee
HA! My '63 Chev had EGR- who knew?
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Probably the individuals who designed the system. Warming up the intake faster and keeping some more heat in the cylinders than normal is an easy peasy way to help cold combustion. It's not EGR in the sense that some proportional amount of exhaust gas is routed back to the intake, or that it's metered, but it has characteristics of both internal/external EGR systems, so I call it EGR.
