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Manifold
- Thread starter mr bognor
- Start date
its easier if you see pics of the 2 next to each other
the 4-1 gets incredibly hot, due to the shape and length of the header pipes, these 4 pipes meet at the collector (where all4 pipes meet into 1)
the 4-1's GLOW bright red
the 4-2-1's have a much better design, gas flow is better, so the manifold doesn't get anywhere near as hot
thats the non techy explanation!!
the 4-1 gets incredibly hot, due to the shape and length of the header pipes, these 4 pipes meet at the collector (where all4 pipes meet into 1)
the 4-1's GLOW bright red
the 4-2-1's have a much better design, gas flow is better, so the manifold doesn't get anywhere near as hot
thats the non techy explanation!!
the 'best' manifold depends entierly on your engine specification and the rpm region it spends 90% of its time. So there is no saying a 4-1 or a 4-2-1 manifold is best, you just cannot quantify that.
However, if your using the factory available items, then the 182's 4-2-1 manifold is better simply because its less restrictive in the collector areas and the 6" directly outside the exhaust port.
However, if your using the factory available items, then the 182's 4-2-1 manifold is better simply because its less restrictive in the collector areas and the 6" directly outside the exhaust port.
an experts opinion:
There has been a bit of controversy recently regarding our manifolds against various others, especially against others stainless steel units and the benefits of 4-2-1 and 4-1. Regarding the merits of 4-2-1 and 4-1, some people seem to have the facts all arse about face. From a technical point of view a well designed 4-2-1 will give more low down power and reduce a bit off the top and the 4-1 will give more top end and bit less at the bottom. The critical words here being WELL DESIGNED. This all goes back to my comments about Sound/Pressure waves. When this was talked about above it was in relation to exhaust systems, but the same rules apply to exhaust manifolds. For things to be correct if you have a 4-2-1 manifold, you have the 4 pipes coming out of the head, 2 pairs (primary pipes) then join up to make 2 more pipes (secondary pipes) and then these 2 pipes join to make 1 pipe. For the pressure waves to be working correctly on 4-2-1 manifold the lengths of the primary pipes must be the same as the secondary pipes, regrettably some manifolds do not follow this pattern and therefore I cannot see them being much benefit. I can understand why they have not done this as it should be, it is a question of space, as 4-2-1 is more complicated, having more joints. So the argument about which is best does not stand up to a proper comparison. All I can say is ours are all 4-1 and they all work very well and give more power.
There has been a bit of controversy recently regarding our manifolds against various others, especially against others stainless steel units and the benefits of 4-2-1 and 4-1. Regarding the merits of 4-2-1 and 4-1, some people seem to have the facts all arse about face. From a technical point of view a well designed 4-2-1 will give more low down power and reduce a bit off the top and the 4-1 will give more top end and bit less at the bottom. The critical words here being WELL DESIGNED. This all goes back to my comments about Sound/Pressure waves. When this was talked about above it was in relation to exhaust systems, but the same rules apply to exhaust manifolds. For things to be correct if you have a 4-2-1 manifold, you have the 4 pipes coming out of the head, 2 pairs (primary pipes) then join up to make 2 more pipes (secondary pipes) and then these 2 pipes join to make 1 pipe. For the pressure waves to be working correctly on 4-2-1 manifold the lengths of the primary pipes must be the same as the secondary pipes, regrettably some manifolds do not follow this pattern and therefore I cannot see them being much benefit. I can understand why they have not done this as it should be, it is a question of space, as 4-2-1 is more complicated, having more joints. So the argument about which is best does not stand up to a proper comparison. All I can say is ours are all 4-1 and they all work very well and give more power.
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