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Exhaust Scavenging #4782825
06/10/18 08:12 AM
06/10/18 08:12 AM
Joined: May 2005
Posts: 10,390
ROCHESTER, NY
Char Baby Offline OP
Char Baby  Offline OP
Joined: May 2005
Posts: 10,390
ROCHESTER, NY
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"
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic LX
Re: Exhaust Scavenging [Re: Char Baby] #4782846
06/10/18 08:27 AM
06/10/18 08:27 AM
Joined: Jan 2015
Posts: 647
missouri
ragtoplvr Offline
ragtoplvr  Offline
Joined: Jan 2015
Posts: 647
missouri
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
06/10/18 08:38 AM
Joined: Mar 2017
Posts: 5,767
...
PimTac Offline
PimTac  Offline
Joined: Mar 2017
Posts: 5,767
...
https://youtu.be/rNtS8qyjIJU

Skip to around 2:50 in the video.


2017 Mazda CX-5 GT.

Valvoline Modern Engine 0w20
Mobil 1 EP 108A
Re: Exhaust Scavenging [Re: ragtoplvr] #4782861
06/10/18 08:41 AM
06/10/18 08:41 AM
Joined: May 2005
Posts: 10,390
ROCHESTER, NY
Char Baby Offline OP
Char Baby  Offline OP
Joined: May 2005
Posts: 10,390
ROCHESTER, NY
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 LX
Re: Exhaust Scavenging [Re: Char Baby] #4783000
06/10/18 11:58 AM
06/10/18 11:58 AM
Joined: Sep 2015
Posts: 5,955
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 5,955
Kalifornia Kollective
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
06/10/18 12:59 PM
Joined: Oct 2014
Posts: 12,039
Idaho
CT8 Online content
CT8  Online Content
Joined: Oct 2014
Posts: 12,039
Idaho
Add to the exhaust tuning intake tuning. It is exactly the same but different.


2015 Ford F150 2.7
2018 Ford F350 6.2

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