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| Let's get Technical! Discussion for hardcore in-depth motor heads! |
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#1
10-16-2004, 01:21 AM
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What does 4-2-1 mean for a header?
This might be a stupid question for some of you, but I'm not real familiar with the 'header' area. What does the 4-2-1 mean?
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#2
10-16-2004, 01:39 AM
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Re: What does 4-2-1 mean for a header?
the header goes from the exhaust ports, in 4 of course, then the pipes merge in to two pipes, then finally into one pipe befire they eventually reach the cat
a 4-1 header just removes the 2, the four pipes merge into one. correct me if im wrong 4-1 = high end power? 4-2-1 = low end power?
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#4
10-16-2004, 07:52 PM
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Ok, so which one would be the best choice, or is it just depending on which one you want?
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#5
10-16-2004, 08:02 PM
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Re: What does 4-2-1 mean for a header?
if ur spending a lot of time in ur lower rpms, which u prolly are for daily driving, go with the 4-2-1, unless ur planning on autox'ing a lot
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#6
10-19-2004, 12:29 AM
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Re: What does 4-2-1 mean for a header?
always wanted to ask this but was just waiting for the thread to come up...for daily driving and occasional track driving a 4-2-1 header would be best on my B16 because of the lack of torque...right?
__________________
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12.428 @ 92.5 Mph Before, Now 12.000 @ 94.1 Mph On 1000ft Track Currently 4th in BHRA All Motor Class...Soon to be 2nd (I hope) ...  Theres gonna be alotta slow singin, an flower bringin if I hear my car alarm start ringin  ...
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#7
10-21-2004, 02:36 PM
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Re: Re: What does 4-2-1 mean for a header?
Quote:
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#8
10-21-2004, 05:02 PM
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Yes a 4-2-1 design enphasizes low and mid-range power and torque, while a 4-1 is meant for high end power and torque - they are mostly used for drag cars, if you put them on a D or B you lose that little bit of low end torgue you have 4-2-1 is the way to go
__________________
Oil leak? What oil leak? That puddle under the car is just sweat from all that horsepower. "How many NASCAR passes is that worth? 500?" (Schumacher passing Raikkonen) Emily is amazing, and she messed with my sig AGAIN! 
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