CMF_Nissanmania
» CMF Member
Anyone got any idea on the ideal length/diameter of 4:1 exhaust manifold runners for a NA CG13 application?
Or otherwise where I can source one?
Or otherwise where I can source one?
Advice on 4:1 exhaust manifold
- Thread starter CMF_Nissanmania
- Start date
CMF_LWC
» CMF MemberYou could try this guy's site: http://www.my-acoustic.com/Car/intake_exhaust/exhaust/exhaust2.htm
CMF_deNs
» CMF MemberI've seen a lot of custom jobs, but does anyone actually have premade stuff for the CG anymore? Every place I called said their only option was custom (after every person asked "a nissan what?"). I'd heard Midas were sellers of Hurricane extractors. When I called one of their stores I was quoted nearly $400 for custom (somewhat understandable) and another one of their places tried desperately to convince me that I would gain nothing from it and that I should leave my setup as it is... Sigh.
Are you looking to make your own ones up if you get measurements for lengths?
---dens
Are you looking to make your own ones up if you get measurements for lengths?
---dens
CMF_Nissanmania
» CMF MemberI probably will need to get some made up as a bit of a trial for my NA build. Am interested in getting a setup as on March Cup cars as this is really where my motor is at. Currently have Hurricane 4-2-1 setup with 2" exhaust.
CMF_mipcar
» CMF MemberI also have the Hurricane setup and a 2" system. You will gain some power. I've lost my old dyno run sheets. As I recall my car stock put out 44kw at the wheels. With the extractors and getting rid of the front cat. It went up to nearly 50kw.atw.
Mychael
Mychael
CMF_Brendon
» CMF Memberi think hurricane stuff is made by liverpool exhasut in sydney.
CMF_mipcar
» CMF MemberYeah, that name rings a bell. Also if you have aircon. you need to have the headers slightly modified to fit.
Mychael
Mychael
CMF_deNs
» CMF MemberSo you're going from a 4-2-1 Hurricane setup to a 4-1 setup? Presumably for more top-end power I'm guessing.. Also assuming those hurricane extractors are ones designed to allow room for aircon, modified for aircon or you've removed aircon 
I'd be interested in the 4-2-1's if you're interested in selling after you upgrade.
---dens
I'd be interested in the 4-2-1's if you're interested in selling after you upgrade.
---dens
CMF_ed.
» CMF MemberA guy I know is getting 4-1 stainless headers made up by Westside exhausts in Sydney.
CMF_Nissanmania
» CMF MemberFrom a bit of research, exhaust manifold design is a pretty complex area (especially for NA motors) where the intended use, type of cams, compression ration, desired RPM range etc will determine the configuration.
There is a good article at http://www.team-integra.net/sections/articles/showArticle.asp?ArticleID=2 which cover the theory.
Otherwise building one from scratch is pot luck and trial and error which can get expensive with the cost of dyno time and custom fabrication.
There is a good article at http://www.team-integra.net/sections/articles/showArticle.asp?ArticleID=2 which cover the theory.
Otherwise building one from scratch is pot luck and trial and error which can get expensive with the cost of dyno time and custom fabrication.
CMF_lam.666
» CMF Membergtrholic has the impul 4-1 headers you might be able to ask him for some measurements
$400 for hurrican headers is a rip
call them directly their worth about $250 new
$400 for hurrican headers is a rip
call them directly their worth about $250 new
CMF_deNs
» CMF MemberIt was $400 for custom ones since they said they didn't have anything for the K11. But $250 new? That's awesome...
---dens
---dens
CMF_mipcar
» CMF MemberYep, cost me around $400.
Mychael
Mychael
CMF_Yom
» CMF MemberYeh $250 is highly unlikely. Unless they're complete rubbish.