RE: honda civic headers
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RE: honda civic headers - 7/18/2005 12:50:06 AM
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sacicons
Posts: 7699
Joined: 6/26/2004
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the diameter of the pipes has a direct effect on exhaust gas velocity, and if the pipes are improperly sized, even by only a little bit, it will either restrict the flow enough to hurt high end power, or it will cause stagnance in the exhaust flow, killing the cylinder scavenging effect. and that will really hurt your low end, and can even hurt top end. so you really should stick to companies that spend money on designing and flow testing their headers. there are a few things you can get away with using cheaper parts, but headers and exhausts are not them.
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Yes, there's a "Replacement for Displacement". Its called Volumetric Efficiency.
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ORIGINAL: Forty04
I choose the rear ending
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RE: honda civic headers - 7/18/2005 12:59:24 AM
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nightrider46
Posts: 427
Joined: 7/14/2005
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exhaust flow is exhaust flow, pressure is pressure you'll still have the same coming out of the pistons when it makes its explosion it's just matters how thick is the headers cuz the more room it has to push out, the faster the air will release to the exhaust and thats when u have your Cat for a restriction so u wont lose back pressure
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RE: honda civic headers - 7/18/2005 1:30:59 AM
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sacicons
Posts: 7699
Joined: 6/26/2004
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oh ok. good to know that you are so knowledgeable about flow rates, cylinder scavenging, and fluid dynamics. thanks for your insightful comments.
yes it was sarcasm. for the most part i am a very liked and likeable person here, but i am sick and tired of people talking about things that they dont know about like it is gospel. do a little looking around here for an article i posted about backpressure and flow rates and see if it makes sense. those flow rates and pipe diameters play a huge role in power production, especially in headers.
or, go buy your "DR267 Super Sport" (yeah, its a BS name) no-name header and come line up next to me and my DC sports ceramic coated 4-2-1 header. while youre at it, cut your springs and spray paint MUGEN across your hood. oh, and stickers. lots of stickers.
I hope you dont take too much offense to this, but i do hope that you decide you wont just believe everything you hear from friends and read on the internet. and no, im not saying you have to spend a fortune to go fast, but you wont get there buying the cheapest parts you can find. one good part is worth three or four cheap ones. and backpressure being "needed" is a bunch of crap.
and im a little cranky because im sunburned and tired, so maybe we'll have to talk about this tommorrow when i have more patience. sorry if i offended you. nothing personal.
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Yes, there's a "Replacement for Displacement". Its called Volumetric Efficiency.
quote:
ORIGINAL: Forty04
I choose the rear ending
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RE: honda civic headers - 7/18/2005 10:37:38 AM
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Remmy
Posts: 11165
Joined: 1/11/2005
From: Charleston
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I didnt know jack crap about bacl pressure and all of that until I read Sacicons article... It should be a sticky if it already isnt, ill go look for it.
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RE: honda civic headers - 7/18/2005 10:38:48 AM
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Remmy
Posts: 11165
Joined: 1/11/2005
From: Charleston
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never mind, its the only sticky in here! lol
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RE: honda civic headers - 7/18/2005 12:20:51 PM
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ngoti 8tor
Posts: 4424
Joined: 3/24/2005
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quote:
ORIGINAL: nightrider46
exhaust flow is exhaust flow, pressure is pressure you'll still have the same coming out of the pistons when it makes its explosion it's just matters how thick is the headers cuz the more room it has to push out, the faster the air will release to the exhaust and thats when u have your Cat for a restriction so u wont lose back pressure
Dude! That is not what a Cat is for. And if what you say is correct, then why buy a header at all? Why not stick with the stock exhaust manifold and just buy a good quality Cat? And while you're at it, make sure you buy crush-bent piping for your exhaust instead of mandrel-bent, and make sure they put a few hundred extra bends in the piping since "exhaust flow is exhaust flow".
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ngoti8tor
"I see", said the blind man pissing into the wind, "It's all coming back to me now".
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ORIGINAL: 2000 LoW reD Si
haha ngo your like the forums...sex guru.
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RE: honda civic headers - 7/18/2005 12:51:01 PM
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nightrider46
Posts: 427
Joined: 7/14/2005
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hey i'm not offended it's just when me and a friend of mine did the dyno and we have the same everything besides the headers. i have mugen 4-1 and he has DC 4-1, and it showed that that the DC headers had 2 extra hp which is not a big diff to even notice the power. So if u think it's worth to pay an extra 50-100$ for 1-3 hp then ur nuts. U probably could get that hp by making ur timing faster on ur distributor
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