16V Valves....

[oldeskewltoy]

The extension is some 6 months... maybe? Hope to afford to do it, but a few priorities before it

from another forum Wrote:For sure the short side radius has more influence on flow, then the back cut. I just recall reading an article about the effects of a 20* Vs a typical 30* back cut on the exhaust valve of a SB motor. Dave W

only partially done so far... but exhaust valve type seems to matter less then ported, or unported port....


A bit of understanding of how the FP2 flowbench I have, operates... It takes air samples every 2 seconds, these samples measure air in CFM (cubic feet per minute) The samples come out to the tenth, I take 18 to 20 samples per setting, from those 18 to 20 sample 6 are randomly taken to then average. This is how I get to post readings to the hundredth. For TRUE actuality readings, look @ the number and figure the high number was .5 higher, while the low number was .5 below. For example in the first readings below ".050" - 27.78 - - 38.96" 27.78 was actually 18 readings that ranged from 27.2 to 28.3.


Some numbers.........

Stock chamber w/stock ports, stock valves no back cut
..........Lift - Exhaust- -Intake

• .050" - 27.78 - - 38.96
• .100" - 61.81 - - 78.58
• .150" - 94.28 - - 116.58
• .200" - 109.44 - - 148.48
• .250" - 114.66 - - 167.41
• .300" - 116.40 - - 175.94
• .350" - 118.36 - - 179.08
  

Stock Chamber w/stock ports, SI valves
..........Lift - Exhaust- -Intake

• .050" - 28.22 - - 40.24
• .100" - 59.47 - - 80.65
• .150" - 93.47 - - 121.53
• .200" - 111.23 - - 150.81
• .250" - 116.23 - - 167.92
• .300" - 117.90 - - 175.35
• .350" - 119.62 - - 180.24
  

More to come........