as I figure out my flowbench software....

[SappySE107]

UPDATED 12-23-05!

Do not use any of the numbers posted here for anything useful to you. I have learned how to get more accurate readings to compare with as well as how to make it as consistant as I possibly can. I am leaving this post as a history of my learning:P Always remember to check that there are no leaks through other ports. Always check the calibration on the flowbench EVERY DAY! or even twice a day as temperature, humidity, and barometric pressure will throw things off a little. Use 2 test springs per valve to keep them from trying to open at the lowest lift testings (reason some of the low lift values posted in this thread are wrong). Shroud the intake and exhaust ports for more accurate, consistant readings. When testing manifolds, install the fuel injectors, and with the plenum on, tape off all open vacuum ports and ports to the other head that wont be there.


It has a digital readout on the box so I can write this shit down until I read the manual on how to do this with the software and get graphs. All at 28 inch pounds of water

Stock 3.1 Head without using clay (testing to see the real difference, ive read you need it to make the tests more accurate)

Intakes
.050 29.9 cfm
.100 54.4 cfm
.150 73.2 cfm
.200 92.0 cfm
.250 108.2 cfm
.300 122.1 cfm
.350 135.6 cfm
.400 146.2 cfm
.450 153.0 cfm
.500 158.0 cfm

Intake with Clay
.050 30.1 cfm
.100 56.8 cfm
.150 73.8 cfm
.200 98.4 cfm
.250 119.1 cfm
.300 138.2 cfm
.350 156.6 cfm
.400 167.4 cfm
.450 174.8 cfm
.500 177.0 cfm

Compared to what chris got with his stock 3.1 flowbenched.

.........no clay.......with clay.....chris' numbers
.050...29.9 cfm.....30.1 cfm
.100...54.4 cfm.....56.8 cfm......57.42 cfm
.150...73.2 cfm.....73.8 cfm
.200...92.0 cfm.....98.4 cfm......95.04 cfm
.250...108.2 cfm...119.1 cfm
.300...122.1 cfm...138.2 cfm....130.7 cfm
.350...135.6 cfm...156.6 cfm
.400...146.2 cfm...167.4 cfm....163.35 cfm
.450...153.0 cfm...174.8 cfm
.500...158.0 cfm...177.0 cfm....183.15 cfm

[eliteweapons]

Those stock 3.1 heads flow like crap.

[SappySE107]

Yeah, they do:P I got another vacuum to hook up both at once so I can do exhaust ports, and its still not enough. Gotta get a larger one....damn. Figured out the software though not the graph part of it (dunno why its not graphing). Those above numbers are a bit off cause I just picked a number as it was flying past (not stable). Software does averaging as I hold down the trigger

Hoping to have all 3 cylinders flowed from a stock 3.1, 3100, and 3400. Id like to see how they flow cylinder to cylinder stock as well as how the castings changed over the years. Then ill get some flow numbers for my porting on a set of 3400 heads. From there, research...pray for sales, and go from there.

[eliteweapons]

I have the 3100 heads and refitted them with 1.8 intake and 1.5 exhaust. after porting the numbers were intake= 270 lift 133.5 cfm 360 lift 169.9 cfm 450lift 197.3cfm 540lift 205cfm
exhaust 225 114
300 138.9
375 150.6
450 157.9

And I only did this set for me. I hate porting.

[SappySE107]

2 vacuums didnt cut it. Turns out the old one works better than 2 new ones. Broke my valve device trying to bend it...so the JB weld is curing again on it. Might do some more work over the weekend...most likely. Gonna port a mitsu head for some money as well since I forgot it was sitting in the corner and my friend wanted it done so he could sell it.

[SappySE107]

Oh man, i can't stop laughing! Got the other vacuum on here and tested exhaust flow of a stock 3.1 head. Pathetic at best. Im going to double check the intakes with the new vacuum, and try to get the graphs going. I have enough test springs to do every cylinder on a head now though First row is lift, second is flow in CFM.

0.0500...24.0
0.1000...44.9
0.1500...67.0
0.2000...85.2
0.2500...100.3
0.3000...111.7
0.3500...115.6
0.4000...115.4
0.4500...114.0
0.5000...114.2

[eliteweapons]

I didn't realize there was that much improvement on the gen III heads over the gen II.

[SappySE107]

Oh yeah:P I am flowing all the intakes. New vacuum is giving me slightly higher readings. Helps that my depression isn't dropping so much now with the better vacuum. Numbers are more stable. Im just posting as i learn this

[eliteweapons]

when we tested mine before and after we had 74% efficiency of exhaust to intake ratio stock and 77% after the mods. With the higher flows after mods at 28"

[SappySE107]

Sorry for the size reduction, i didnt wanna go 1024x768 on this. Thats cylinder 1 intake and exhaust. After we move servers, ill have quite an update for the pushrod head section:P 2.8/3.1 Gen 2 aluminum head.

[SappySE107]

Here is the graph i know people really wanted to see. 3400 exhaust flow rate vs 3.1.



0.0500...24.3
0.1000...52.5
0.1500...77.7
0.2000...101.9
0.2500...117.3
0.3000...129.1
0.3500...134.3
0.4000...138.8
0.4500...142.7
0.5000...145.7

[SappySE107]

And here is the 3.1 vs 3400 intake.



0.0500...46.1
0.1000...64.2
0.1500...89.5
0.2000...113.7
0.2500...137.5
0.3000...159.1
0.3500...179.3
0.4000...194.9
0.4500...208.3
0.5000...216.9
0.5500...222.9
0.6000...225.0

Went to .600 this time.

[SappySE107]

No more updates till the server switch, and I flow a 94-95 3100 head. For the record, the above 3 or 4 posts are the most accurate flow numbers. Got the software to work that averages out the turbulent readings. I will have full size pics with watermarks to represent our fine site

[SappySE107]

Ok, so i forgot that I wanted to test out these SI valve portflow series valves. They are pretty much on par with stock. Slightly worse at mid lift but hardly a difference. The program averages all the values and the average between cylinders was further apart than the SI portflow intake valve was in comparison to a stock valve on the same port. I will be having an angle cut on the backside of the valves though later on so I will see what this does.

[sil]

sweet you have a flow bench
it uses a water calumn for inches of gravity?

can wait till you switch servers and get the site updated with the benchmarks

is it just me or does the last flow bench you posted... at about .0250 peak, and then dip out around .100 then recover at about .1250
and that is the 3400 intake connected to a 3400 head?
ported head?