Turbo`s and Super`s for the intake but what of the exhaust...? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 05-15-2005, 07:43 AM
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Turbo`s and Super`s for the intake but what of the exhaust...?

We have Turbo`s & Superchargers for the intake systems for sure... Plus we have headers for the exhaust right...

But what about extracting more flow from the exhaust...? A Turbo or Supercharger to evacuate the exhaust system...? Or something to just aid it...? A header of a good design is supposed to scavange the exhaust of a cyl. when another fires via the collector (main reason for equal length tubes) Any info or testing done on something that might do this...? I know the flow rate of the exhaust is much higher because of the energy release of combustion but its a thought...?


Why not take the speed of something like a Nascar cup car and with ducting and some fabricating & devise a system that uses the high speed air to create a low pressure area at the end of the exhaust to basicly aid in the removal of the exhaust gases...?

Possible or use a pump of some sort...?

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Old 05-15-2005, 07:52 AM
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you have to have back pressure, without bp things go funny.
also, there is a suction at the end of your exhaust, when your driving, there is a low pressure area behind the tailpipe.
not trying to discourage further research, just randomly rambling.

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Old 05-15-2005, 03:15 PM
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Well with froced induction you want to have as little back pressure as possible especailly with a turbo since the turbine is making back pressure and eating up power you are losing power to lack of flow but it would be possible to achive boost without it so no matter what you do its going to be there thats just part of the game

A supercharger instead of causing a loss of power due to lack of flow is eating power off your engine (MUCH more power then a turbo)

Now when you feed a cylinder with high pressure its going to leave with higher pressure then you would with a N/A engine because it is still trapped in there it has expanded then its going to come out the exhaust faster then normal

Have the most free flowing exhaust possible because you dont have to worry about velocity because its going to be there no matter what
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Old 05-15-2005, 04:15 PM
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It would be completely impractical. A belt driven turbine to create vacuum in the exhaust would have to be HUGE and spin at an extremely high rate of speed. Frictional losses, the power required to spin it and the damage done to the oil from the heat just wouldn't be worth the effort. Not to mention the funky cam timing you'd need to keep from sucking the fresh intake charge right out of the cylinder.

Larry
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Old 05-15-2005, 06:44 PM
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Larry... Basicly what I figured but wondered if it would also apply to a normal aspirated engine...? Not a high vac but rather a very low pressure at the exit of the exhaust...? (more like a draw or scavange...?)

I understand the inpractical idea for a turbo or supercharged engine mainly from the severe draw on HP... (unless another way could be devised...?)
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