depth of piston notch vs cc of relief?
I used this page to get arough estimate.... emphisis on ROUGH ESTIMATE.
http://www.abe.msstate.edu/~fto/tools/vol/wedge.html
I plugged in these numbers to estimate an intake valve relief piston eyebrow:
H: .400 (approx eyebrow width)
A: 1.500 (approx eyebrow length)
B: .090 (flycut depth)
C: .750
This results in 0.02249 or 0.3687 cc
I had previously estimated my reliefs at 1cc, but maybe now ill estimate them at 2/3 a cc.
http://www.abe.msstate.edu/~fto/tools/vol/wedge.html
I plugged in these numbers to estimate an intake valve relief piston eyebrow:
H: .400 (approx eyebrow width)
A: 1.500 (approx eyebrow length)
B: .090 (flycut depth)
C: .750
This results in 0.02249 or 0.3687 cc
I had previously estimated my reliefs at 1cc, but maybe now ill estimate them at 2/3 a cc.
Thread Starter
Joined: Mar 2003
Posts: 8,319
Likes: 1
From: North Carolina
hmmmm, i have a spread sheet that may or may not work. does anyone know the depth of valve reliefs on the intake and exuast with a given cc for relief. for 0.090" cut i got a .662 cc on the exhuast side.
Thread Starter
Joined: Mar 2003
Posts: 8,319
Likes: 1
From: North Carolina
ok well I finally got it to work out in the equation, I think. I am in the process of making an excel sheet with all the variables to calculate cc based on cutter, valve angle, ect.
Here is what I am getting for a 2.125" intake cutter:
0.010"------------------0.063 cc
0.020"------------------0.109 cc
0.030"------------------0.151 cc
0.040"------------------0.192 cc
0.050"------------------0.234 cc
0.060"------------------0.279 cc
0.070"------------------0.329 cc
0.080"------------------0.385 cc
0.090"------------------0.447 cc
0.100"------------------0.517 cc
Granted this can still be way off, but I am going to double check on some things and make sure its right and play with it in excel. I am also going to cut and cc mine (or at least attempt to) to compair.
Here is what I am getting for a 2.125" intake cutter:
0.010"------------------0.063 cc
0.020"------------------0.109 cc
0.030"------------------0.151 cc
0.040"------------------0.192 cc
0.050"------------------0.234 cc
0.060"------------------0.279 cc
0.070"------------------0.329 cc
0.080"------------------0.385 cc
0.090"------------------0.447 cc
0.100"------------------0.517 cc
Granted this can still be way off, but I am going to double check on some things and make sure its right and play with it in excel. I am also going to cut and cc mine (or at least attempt to) to compair.
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Verdad Gallardo Thread Starter
Joined: Mar 2003
Posts: 8,319
Likes: 1
From: North Carolina
Its pretty long, my calculator took a while to do the integral lol. What I did, was take the area of a semi circle and subtracted the parts out I didnt need for each sliver for the integral. Based on some basic geometry and what not, it wasnt too bad, just a really long solution. Like I said, I will try to get it in excel. Now that I have an idea where I stand on things, I am getting everything ready for when I get the heads on Friday. Just have to wait on the exhuast fly cutter so I can modify the cutter or the head so it will fit.
