Quick 4 branch noob question

1. Smylie Regular Poster Joined: Jan 2009 Southampton Posts: 251 1.4 Citroen saxo furio

   #1 14th April 2009, 14:24

   Hi
   Im going to get a 4 Branch mainfold soon i was just wondering what would give me the best power.
   A 4-1 or A 4-2-1
   Thanks
2. mik Frequent Poster Joined: Mar 2009 tamworth Posts: 629 vts gti-6 XKR

   #2 14th April 2009, 14:28

   4-1 harder to find, cituning do one but only for straight through mid sections.. aimed at track cars
3. Smylie Regular Poster Joined: Jan 2009 Southampton Posts: 251 1.4 Citroen saxo furio

   #3 14th April 2009, 14:36

   oh right ok, thanks for quick reply, il see if i can hold of one.
4. JamesRm Forum Section Moderator Joined: Aug 2008 Liverpool Posts: 15517 Saxo VTR

   #4 14th April 2009, 14:36

   i think 4-2-1 gives more mid range, and 4-1 gives more more top end
5. user_22749 Saxperience Post Whore Joined: Apr 2008 N.Wales Posts: 7746 e46 M Sport

   #5 14th April 2009, 14:36

   I think 4-1 is more for higher rev power and 4-2-1 is for low down rev power
   
   EDIT: SaXo_vtr123 beat me to it!
6. Smylie Regular Poster Joined: Jan 2009 Southampton Posts: 251 1.4 Citroen saxo furio

   #6 14th April 2009, 14:41

   ah well if thats the case then the 4-2-1 would be the one for me.
7. JamesRm Forum Section Moderator Joined: Aug 2008 Liverpool Posts: 15517 Saxo VTR

   #7 14th April 2009, 14:43

   Quote:

   Originally Posted by Smylie ah well if thats the case then the 4-2-1 would be the one for me.

   Yeah they are what most people go for
   
   Try Kam Racing, they have a nice selection
8. KamRacing Saxperience Addict Joined: Nov 2006 A farm shed in Aylesbury Posts: 14916 Corolla AE86 Peugeot 205 B18C (in bits)

   #8 14th April 2009, 21:40

   neither a 4-2-1 or a 4-1 will give you extra power over the other design if they are a good make and well designed.
   Thats not their job.
   Its not about how much power you will make but where that power will be.
   For a standard or fast road camshaft profile, you want a manifold to enhance the mid range so a 4-2-1 is best.
   For a more race orientated camshaft profile the powerband will be moved up the revrange so a 4-1 will work best at high revs so will complement the camshaft choice.
   
   Kev