Originally Posted by klx650sm2002
Bit of a newbie question, here goes, when quoting gas flow figures for throttle bodies, ports, mufflers etc. how many inches of H2O are they measured at ?
Thanks in advance
Generally speaking, 28 in/H2O- BUT you need to be certain of what the depression actually
is because sometimes figures derived from a different depression will be used in advertising (for example) to "inflate" the figures, or flow at a higher depression will be compared to another manufacturer's flow taken at some lower depression- again to inflate the claims.
There are formulas to correct different depressions to each other or to a 28 in/H2O 'standard', as you may already know. Like to convert 25 inches of water to 28 inches of water: multiply by 1.06.
Some info on flow benches and how to fabricate them- http://www.flowperformance.com/