RE: Backpressure: The Myth and Why It's Wrong.

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Honda Civic >> Your Ride >> Header, Intake, & Exhaust >> RE: Backpressure: The Myth and Why It's Wrong.

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RE: Backpressure: The Myth and Why It's Wrong. - 6/5/2005 10:07:31 AM    LEVIII Posts: 2501 Joined: 4/18/2005 Status: offline Whenever people start to argue with me about they need back pressure and cars need back pressure I just say, tell me why. Best attempt at a response was cause cars are designed to need it, lol _____________________________ Buy your parts from........Speed6motorsports.com pick 2: reliable, cheap, fast (in reply to elfreaky70363) Post #: 31

RE: Backpressure: The Myth and Why It's Wrong. - 6/5/2005 10:50:42 AM    elfreaky70363 Posts: 450 Joined: 5/14/2005 Status: offline i have a question on one point made in the article that has been bugging me. there was a comparison made to a garden hose. now i realize that if you narrow the opening on the end of the hose the water comes out with more pressure. but does it really come out faster? i dont think so. i think the water can come out as fast as the pressure of the source it originates from allows it to. in other words, if you fill 2 buckets with water one with a hose that has an unrestricted opening and one with a hose that has a narrow opening they should fill at the same rate if the pressure of each ones original source is the same. when u restrict the opening of the hose it builds pressure within the hose and struggles to relieve the same pressure it had with the unrestricted opening, thus appearing to be faster. isnt this in effect creating back pressure when you restrict this opening? and wouldnt this be the same effect when referring to exhaust? help me to understand better if you can please. thanks < Message edited by elfreaky70363 -- 6/5/2005 10:52:08 AM > _____________________________ R.I.P. ARMAND LUKE FRICKEY 2/3/1984 - 1/6/2005 WE RIDE TILL I DIE / NEVER FORGOTTEN (in reply to LEVIII) Post #: 32

RE: Backpressure: The Myth and Why It's Wrong. - 6/5/2005 11:05:14 AM    LEVIII Posts: 2501 Joined: 4/18/2005 Status: offline Kinda, less will come out faster _____________________________ Buy your parts from........Speed6motorsports.com pick 2: reliable, cheap, fast (in reply to elfreaky70363) Post #: 33

RE: Backpressure: The Myth and Why It's Wrong. - 6/5/2005 11:42:35 AM    sacicons Posts: 7674 Joined: 6/26/2004 Status: offline its actually one of the basics of physics and fluid dynamics. if you have an equal amount of a fluid (air works as a fluid in these discussions) moving through 2 tubes, the fluid has to move faster to get through the smaller of the 2 tubes in the same amount of time. if you could measure the speed of the water coming out of the end of the hose, you would see that it is faster, thats why it sprays farther. also, one small problem with that analogy, it doesnt point out that the comparison is not the hose, its the opening. yes, it would just cause pressure to build up behind the end of the hose, but that is not where the comparison is. its only at that 1/8 of an inch of length that is the actual opening. _____________________________ Yes, there's a "Replacement for Displacement". Its called Volumetric Efficiency. quote: ORIGINAL: Forty04 I choose the rear ending (in reply to LEVIII) Post #: 34

RE: Backpressure: The Myth and Why It's Wrong. - 6/5/2005 12:10:29 PM    elfreaky70363 Posts: 450 Joined: 5/14/2005 Status: offline ok thanks, yeah i'm a lil clearer on that now. definitely not a physics major here so no argument from me _____________________________ R.I.P. ARMAND LUKE FRICKEY 2/3/1984 - 1/6/2005 WE RIDE TILL I DIE / NEVER FORGOTTEN (in reply to sacicons) Post #: 35

RE: Backpressure: The Myth and Why It's Wrong. - 8/30/2005 7:28:48 PM    jnoh   Posts: 38 Joined: 6/30/2005 Status: offline thanks for the post... cleared things up. (in reply to elfreaky70363) Post #: 36

RE: Backpressure: The Myth and Why It's Wrong. - 11/27/2005 2:56:16 PM    shopmanual   Posts: 139 Joined: 8/26/2005 Status: offline Thanks for finally clearing up the whole backpressure thing. Everybody I've talked to says you need it, but they have no idea why. (in reply to sacicons) Post #: 37

RE: Backpressure: The Myth and Why It's Wrong. - 1/25/2006 6:03:23 PM    sickcivic07   Posts: 74 Joined: 1/24/2006 Status: offline Now you guys have me worried I'm gonna have to check it. _____________________________ 2000 Honda Civic Si Cold-air intake Greddy exhaust Vex Wheels Short shifter 2 Kicker Cvr 12's Rockford fosgate amp DC Sports header Tokico Coil-overs Reactive Plug Wires (in reply to shopmanual) Post #: 38

RE: Backpressure: The Myth and Why It's Wrong. - 5/4/2006 10:32:27 AM    Impreza WRX Posts: 335 Joined: 1/6/2006 Status: offline I always thought it's because if there is no back pressure (i.e. your exhaust fell off at the header) the exhaust valves won't seat properly (as in slam shut harder) and will slowly mushroom up over time... < Message edited by Impreza WRX -- 5/20/2006 5:14:27 PM > (in reply to sickcivic07) Post #: 39

RE: Backpressure: The Myth and Why It's Wrong. - 5/23/2006 12:51:25 PM    ArmedSalad   Posts: 1 Joined: 5/23/2006 Status: offline Impreza's explanation is what i was given by a few people. an amount of backpressure is needed for the valve to work properly. otherwise too little or no BP would cause them to become damaged over time. _____________________________ not a owner...yet. looking at 2006/2007 Civic Si Fiji Blue Pearl. (in reply to Impreza WRX) Post #: 40

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