The problem I see with the dyno test is it only yields one piece
of power information.
As Dave has said (I hope I get this right) what is important is
the way the horse power curve fits between the transmission's
shift points. An engine that would go like hell with a 6 speed
might be a dog with a 3 speed.
Example: A formula Ford engine will produce maximum power
with a four into one header. It will go faster on a road race
course with a 4-2-1 header which produces a lower but
broader power curve. To me, the only race peak HP
always wins is the dyno race.
A 1,000cc motorcycle with a 6 speed and high power
to weight is quickest with 4-1.
Sooo ... I think I need to find the best header for my
In looking at some headers made to fit real tight areas, I wonder
how the actual behavior of the fluid flow and the shock waves
could be predicted or modeled. I would be surprised if current
CFD models would be of any use. It's looks like it's just too
chaotic to describe mathematically.
Albaugh, Neil wrote:
>It seems to me that a series of dynamometer tests could settle this
>"stepped header" question once and for all.
>Regards, Neil Tucson, AZ