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Jan 20th, 2020
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 Exhaust Scavenging
#4782825
06/10/18 07:12 AM
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Joined: May 2005
Posts: 12,196
Char Baby
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OP
Joined: May 2005
Posts: 12,196 |
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 07:13 AM.
Retired 6 yrs now & lovin' it
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'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic 1.8 LX
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Re: Exhaust Scavenging
[Re: Char Baby]
#4782846
06/10/18 07:27 AM
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Joined: Jan 2015
Posts: 1,559
ragtoplvr
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Joined: Jan 2015
Posts: 1,559 |
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
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Re: Exhaust Scavenging
[Re: ragtoplvr]
#4782861
06/10/18 07:41 AM
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Joined: May 2005
Posts: 12,196
Char Baby
OP
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OP
Joined: May 2005
Posts: 12,196 |
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 6 yrs now & lovin' it
-----------------------------------
'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic 1.8 LX
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Re: Exhaust Scavenging
[Re: Char Baby]
#4783000
06/10/18 10:58 AM
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Joined: Sep 2015
Posts: 6,220
BrocLuno
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Joined: Sep 2015
Posts: 6,220 |
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 
Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
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Re: Exhaust Scavenging
[Re: Char Baby]
#4783044
06/10/18 11:59 AM
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Joined: Oct 2014
Posts: 14,494
CT8
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Joined: Oct 2014
Posts: 14,494 |
Add to the exhaust tuning intake tuning. It is exactly the same but different.
2015 F150 2.7
2018 F350 6.2
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