Exhaust gas flow info

[vvti16v]

Found something interesting on the net about exhaust gas flow.

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All tests via an independent lab

All tests @ 15” wc

2 “ Straight Pipe 283 CFM

2 ¼ “ Straight Pipe 365 CFM

2 ½ “ Straight Pipe 521 CFM

2 ¼” Typical Bent tailpipe 268 CFM

2 ½” Typical Bent Tailpipe 417 CFM

Mufflers:

2 ½” Inlet/Outlet Dynomax Super Turbo 278 CFM

2 ½” Inlet/Outlet Ultraflow Bullet 512 CFM

2 ½” Inlet/Outlet Gibson Superflow 267 CFM

2 ½” Inlet/Outlet Flowmaster ( 2 Chamber) 249 CFM

2 ½” Inlet Outlet Flowmaster ( 3 Chamber) 229 CFM

2 ¼” Inlet/Outlet Thrush CVX 260 CFM

2 ½” Inlet/Outlet Maremount Cherry Bomb 298 CFM

2 ½” Inlet/Outlet Hooker Aero Chamber 324 CFM

2 ½” Inlet/Outlet Hooker Max Flow 521 CFM

2 ½” Inlet/Outlet Borla Turbo 373 CFM

2 1/2" Inlet/Outlet Magnaflow 284 CFM

Standard OEM 2 ¼” Inlet/Outlet 138-152 CFM

Standard OEM 2 ½” Inlet/Outlet 161-197 CFM

[ELEGNT]

WOW...where did u find that...awesome info!

[Evo7]

What does CFM stand for?

Evo

[Guni]

What does CFM stand for?

Evo

Cubic Feet / Minute for measuring air flow.

Opps ....

Edited April 22, 2009 by Guni

[jaderd]

cubic feet per minute.....im looking into that a fair bit at the moment in choosing an air compressor and what tools to run from it.....also need to look into "free air" with compressors too although that is a diff story.....

[chicaboo]

Cubic Feet (per) Minute: That's how you measure air flow.

Gav.

EDIT: Pipped at the post by Jads! :P

[vvti16v]

Anyone seen this muffler?

http://www.holley.com/types/Aero%20Chamber.asp

[whitestivo]

very good work, shows why even a small increase from 2.25 to 2.5 inch is such an improvement, i mean 40%, that is huge

thank you for that info, excellent work

anyone got info lying around on the cfm difference between a 2.5"mandrel bent, and a 2.5"press bent, i'm now thinking this will be much larger than i expect as well

whitestivo

[Suprathai]

That is very interesting with the air flow and amount of restriction that can be placed using a muffler.

An interesting comparison would be the effectiveness of the muffler against noise vs the flow rate

[the_random_hero]

very good work, shows why even a small increase from 2.25 to 2.5 inch is such an improvement, i mean 40%, that is huge

thank you for that info, excellent work

anyone got info lying around on the cfm difference between a 2.5"mandrel bent, and a 2.5"press bent, i'm now thinking this will be much larger than i expect as well

whitestivo

Depends on the radius of the bends. Anything less than say 45 degrees, I don't particularly judge it to be cost effective as it's such a small difference. There is bit of information missing from the first post though - how this corresponds to power. A system with no restriction will be an absolute dog to drive, not to mention will be STUPIDLY loud. As you all know, systems with too much restrictions are the norm when it comes to factory exhaust systems, so changing to a system with less restriction is the way to go BUT it should only be part of the goal - the other parts people neglect is sound and how this impacts on your power band.

Of course this is only for NA engines, FI is a whole other kettle of fish.