eznfrank
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| posted on 29/12/08 at 03:39 PM |
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ZX12r - which is best exhaust option 4-2-1 or 4-1
I'm just about to copy macspeedy and buy my manifold from SS headers but they have two options, a 4-2-1 and a 4-1, and I just wondered if anyone
had opinions or knew what the difference is between the two??
The cost is only about a tenner different so not worried about that, just what power output diff (if anything) would be?
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Hellfire
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| posted on 29/12/08 at 03:54 PM |
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The original ZX12R system is 4-2-1 which gives the best power delivery through the rev range. Having said that, a badly designed 4-2-1 will be worse
than a good 4-1. It depends on the bore diameters and lengths of primaries, collector and secondary pipes.
Phil
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Dangle_kt
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| posted on 29/12/08 at 03:55 PM |
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I can never rememebr which way round it is... 4-2-1 is better for top end power and 4-1 is better for midrange.
might be the other way round, but to be honest I doubt it matters hugely. If you get anyone who can rememeber which way round it is then I would go
for the midrange one - as in a BEC that will be used more than outright top end power.
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mark chandler
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| posted on 29/12/08 at 04:10 PM |
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Other way around, you can tune 4>1 for max power, you can tune 4>2>1 for max torque and power in mid range but its a black art.
I made 4>2>1 same as the bike but used larger bore tube than the original.
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Hellfire
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| posted on 29/12/08 at 06:13 PM |
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There's some good information regarding BEC exhaust systems on Richard Miles superb website.
Here
Phil
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eddbaz
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| posted on 3/1/09 at 04:47 PM |
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I brought some stainless steal 4-2-1 headers, which included a lambna boss for a £295 from mk, with the current exchange rate with the dollar the ss
headers don't seam such a good buy when you add postage and inport duty.
Just a tought.
[Edited on 3/1/09 by eddbaz]
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