Headers vs oem manifolds
So we are new to this forum and to the motorhome world also. I'm having to replace the heads on our ford 460 and seriously considering a banks exhaust instead of the oem manifold which I suspect trash...
Forum Discussion
WILDEBILL308 wrote:Have you ever seen a Tri-Y? 2 cylinders combine a little over a foot away from the port. The cylinders that combine are at opposite ends of the firing order. These combine into a tube that is the same size, which then continues down to the collector.
Banks, Thorley and Gibson are all designed to provide lower end torque and horsepower. All 3 use a “long tube” header designs. If you are concerned with under hood heat go with the ceramic coated ones or wrap them.
Bill
the Tri-Y design "Primaries" are very sensistive to "tuned length"
and the 4-1 design is opposite, ..very sensitive to Collector more than Primary Length
the Tri-Y has a negative pressure wave at the Branch and again at the collector and again at the Collector exit, the design keeps velocity up through out the system and pipe surface area is relatively small to radiate less heat and keep velocity higher
This is from a guy who has done 1000s of dyno tests to prove out simulation software accuracy. (not someone who is trying to sell their brand of header)
Please do a Google search on Tri-Y vs long tube. They are very different, and there is plenty of good info as well as dyno tests that show how Tri-Y has a much wider power band than long tube.
