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Exhaust Scavenging #4782825 06/10/18 08:12 AM
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Char Baby Offline OP
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Yes, I've looked this up but, find too much mumble/jumble.
Can someone explain in more simple terms of what exhaust scavenging is/dose...without writing a book?
Or is there too much to detail in order to explain briefly?

Thanks,

CB

Last edited by Char Baby; 06/10/18 08:13 AM.

"Retired"
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'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic 1.8 LX
Re: Exhaust Scavenging [Re: Char Baby] #4782846 06/10/18 08:27 AM
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ragtoplvr Offline
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Ever shut a faucet too fast and have water hammer?
Enough energy in the inertia of the flowing water to shake the pipes.

Flowing exhaust has energy too. Using that energy to enhance the flow is able to pull more exhaust out a closing valve. or on an opening valve on an adjacent cylinder.

Rod

Re: Exhaust Scavenging [Re: Char Baby] #4782857 06/10/18 08:38 AM
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PimTac Offline
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https://youtu.be/rNtS8qyjIJU

Skip to around 2:50 in the video.


2017 Mazda CX5
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Re: Exhaust Scavenging [Re: ragtoplvr] #4782861 06/10/18 08:41 AM
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Char Baby Offline OP
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Originally Posted By: ragtoplvr
Ever shut a faucet too fast and have water hammer?
Enough energy in the inertia of the flowing water to shake the pipes.

Flowing exhaust has energy too. Using that energy to enhance the flow is able to pull more exhaust out a closing valve. or on an opening valve on an adjacent cylinder.

Rod


Perfect, thanks!


"Retired"
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic 1.8 LX
Re: Exhaust Scavenging [Re: Char Baby] #4783000 06/10/18 11:58 AM
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BrocLuno Offline
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That's an apt description, but in the case of exhaust, it's frequency dependent and usually does not start until north of 3,000 RPM ... It is tune-able like a Pipe Organ tubes. Hence the search for the right length and size of collector tube and extension. It does not generate HP per se, but helps achieve more air flow and that helps with the HP.

There is a YT vid on Engine Masters where they test various exhausts and you can see the results compared smile


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: Exhaust Scavenging [Re: Char Baby] #4783044 06/10/18 12:59 PM
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CT8 Offline
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Add to the exhaust tuning intake tuning. It is exactly the same but different.


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