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Corsa Sport » Message Board » General Chat » Differences between 4-2-1 and 4 into 1 exhaust manifold


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Author Differences between 4-2-1 and 4 into 1 exhaust manifold
Corsa_Quadz
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Registered: 24th Feb 08
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19th Oct 09 at 13:49   View User's Profile U2U Member Reply With Quote
What are the differences between these 2?? Different flow rates??
Kevxx
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Registered: 14th May 08
Location: Forfar, Angus
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19th Oct 09 at 14:08   View User's Profile U2U Member Reply With Quote
I believe, the 4-1 will keep you're power in mid-range, and 4-2-1 will move it higher in you're range.

It depends how you're engine is set-up, which you want.

**this could be shite, only IIRC

[Edited on 19-10-2009 by Kevxx]
Corsa_Quadz
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19th Oct 09 at 14:11   View User's Profile U2U Member Reply With Quote
Sounds good enough for me mate cheers kev
N3CRO
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Registered: 12th Apr 07
Location: Sandy, Bedfordshire
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19th Oct 09 at 16:59   View User's Profile U2U Member Reply With Quote
I've always wondered this myself. I thought maybe they were the same thing but people just word them differently.
alan-g-w
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Registered: 9th Nov 07
Location: Glasgow
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19th Oct 09 at 17:05   View User's Profile U2U Member Reply With Quote
Physically, a 4-2-1 goes from 4 headers (the 'pipes' that come from the flange), into 2 then the two go into one, which then goes onto the exhaust. If that's described well enough.

A 4-1 just misses out the middle stage and the 4 'pipes' just go into the one flange and onto the exhaust.
N3CRO
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Registered: 12th Apr 07
Location: Sandy, Bedfordshire
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19th Oct 09 at 19:25   View User's Profile U2U Member Reply With Quote
Ooohhhh....
Richardhhha
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Registered: 29th Sep 07
Location: Croydon, Greater London
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19th Oct 09 at 19:37   View User's Profile U2U Member Reply With Quote
the 4-1 manifold is better for high rev range use as it looses a bit of torque at mid range

4-2-1 is the better of the 2 tbh more torque mid range and the same at high rpm's

 
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