OST-031: a delicate dance

[oldeskewltoy]

from another forum Wrote:Wouldn't these "bad" heads have better pressure recovery zones?

not disputed.... BUT.. the time required/amount of work involved makes it significantly less desirable. Also to consider is the irregularity of the "flaw"s occurance.



chamber #1 has no "flaw"... chamber #4 has only a minor "flaw". Do I weld up chambers 1 and 4 and shape them to equal the finished chambers of 2 and 3? My typical finished head goes out the door for under $1500, some under $1000

so... to again answer your question... Yes... these heads would have better pressure recovery, but the work involved makes it less affordable/attractive.


"Pressure Recovery" - is a concept researched by Darren Morgan (Induction Research and Development expert). In essence.....

Quote:'pressure recovery' refers to efficient slowing of fluid velocity and transforming the kinetic energy into pressure. In the runner, and especially through a partially-open valve, the velocity is high and the pressure low. In the cylinder, the opposite is true. A gradual transition, as in the exit contour of a carb venturi or through a tapered-hole carb spacer, accomplishes this. Blasting a high-speed air jet into a a big, still cylinder does not.

to simplify this even more(to better visualize)... think of the valve opening inside a funnel.....