If you introduced an induction device (a scoop, if you will) on the exhaust system, say beyond the cats? It would draw in air at high speed, creating a vacuum and would draw the exhaust faster than the exhaust would normally exit. Of course, the exhaust system would have to be larger at that point, with higher flow mufflers, but I'm wondering if there would be any benefit to this?
What would happen....
Jun 11, 2005
4 Replies
what for think about it
hurc ast
Actually there is an exhaust scavenging system that can be used for evacuating the crankcase. The tubes are typically welded into the exhaust pipe right after the manifolds or headers. It's not the best solution but it does work to a certain degree. Here's an example:
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The psi of the exhaust would exceed the psi in the scoop's intake, such that air would be coming OUT of the intake, not IN. In other words, you would only have created another outlet for the exhaust gasses.
If you're interested, here is a great technical article by Dave Vizard from the May Popular Hot Rodding:
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Among other things, the article explains that in an optimized (i.e.,race) engine, there are actually five cycles, not four. The "fifth"cycle occurs during valve overlap, when negative pressure waves (i.e.,vacuum) travels up from the header collector to the exhaust port andhelps draw the fuel/air mixture into the intake port.
180 Out
wrote
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Great article. Gave me some ideas for when I redo my exhaust from the headers back.
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