Exhaust manifolds

1. user_57064 Established Member Joined: Jan 2012 south essex!! Posts: 2442 posi blue vtrs race car

   #1 23rd January 2012, 14:13

   Hey
   
   ive seen that on naturally asperated engines people generally use 4-2-1 manifolds, whats the advantage of this over the sports type 4-1 manifold that is usually used on the turbos like all the pipes same length or is it that the 4-1 helps the turbo spool and no real performance gains in either??
   
   
   thanks
2. user_57064 Established Member Joined: Jan 2012 south essex!! Posts: 2442 posi blue vtrs race car

   #2 23rd January 2012, 17:42

   sorry just read what i wrote, i meant to say no real performance gains over the other one... just wondering cus saw a custom mani on a n/a skyline and wondered why everyone favours the 4-2-1....
3. KamRacing Saxperience Addict Joined: Nov 2006 A farm shed in Aylesbury Posts: 14916 Corolla AE86 Peugeot 205 B18C (in bits)

   #3 23rd January 2012, 20:37

   Sadly these manifolds are rarely fully optimised as space is such a major design factor. Buy what fits.