Posted:
Fri Feb 03, 2006 9:29 amby talon
Good morning gents
While using the SF110 this week I noticed a difference in flow at 10" depending on the number of corks I had out.
I had 1-4 out - at 10" the inclined manometer read 93 that translated to about 102cfm - if I remember correctly.
I pulled the last cork out and at 10" the inclined manometer read 63 - thats about 110cfm.??????
I noticed on the inclined manometer the scale has more graduation between 60-80 I think. Is this the area I need to be in when doing my bench work?.....or is my bench having problems
Thanks
Jim
Posted:
Fri Feb 03, 2006 12:29 pmby Thomas Vaught
Well you should see a difference in the flow depending on what combination of corks you had out for your testing. That is the way the bench works. With all of the corks out you should be reading still a different number at 10" of water.
The reason why the graduations are spread out is the scale is a "square root" scale. Try and stay between 60 and 100 percent.
Best thing you could do would be to purchase a SF-110 manual from Super Flow. I talked to Harold Betties about selling the manuals to the board and he said call the service people up at SF and buy what you need.
Tom V.
Posted:
Fri Feb 03, 2006 1:01 pmby talon
Thanks Tom
I bought the flow com about a year ago.....I haven't hooked it up...( embarressed ). I watched the tape and my head started to spin - push this button means this and push that buttong means that. I think I will need to hook it up - it will probably help me get repeatability and if I am not mistaken I can hook up my pitot tubes and it will automatically calculate velocity? It is just the user interface on the front of that box - I''l have to get over it.
Thanks for taking the time to answer newbie questions
Jim
Posted:
Fri Feb 03, 2006 10:12 pmby Thomas Vaught
The bench is actually pretty simple once you understand how it works.
The plate on the top with the stoppers is the orifice plate. The "inclined" manometer on the front of the bench compares the difference in pressure under the plate with room air and gives you a difference in pressure which is shown by the manometer movement on the incline.
As you remove or add stoppers you change the 'flow range" and therefore the number that you multiply the percentage you read on the scale by. For example you read 68% and the range was 100 cfm then you would actually be flowing 68 cfm.
Only two motors work (there are 4) at one time.
Two motors allow intake testing and two motors allow exhaust testing.
Hope this helps.
Tom V.
Posted:
Fri Feb 03, 2006 11:01 pmby gofaster
Part of the difference in your readings may be due to temperature differential changes, and partly due to paralax viewing of the meniscus in the inclined manometer.
Temps change quickly, and if you don't have the FlowCom hooked up you have to quickly and accurately record temperatures, and manometer readings, and then move on to your next lift setting. If you just leave the SF-110 run at a given lift for a while, the temps will change fast, and your readings will change.
The inclined manometer has a mirrored scale, so you have to look straight into it to make sure you are seeing the meniscus properly.
Without having your FlowCom hooked up, you absolutely have to have the manual or at least a copy of the temperature corrections to accurately flow test. With the FlowCom installed you need to remove the thermometers and installl the FlowCom temp sensors in their place. Then the FlowCom will make the temp corrections for you.
Adding the depression control and Performance Trends software will cut your testing time down unbelievably! Plus with depression control, the bench runs so much cooler that you can take a little time to probe a port with flags, flow balls or a pitot, and not be in great danger of overheating the motors.
Superflow sells a basic manual for the SF-110, and they sell an expanded manual that covers the SF-110 bench and the FlowCom installation and operation.
I used my SF-110 for a long time without electronics, writing everything down on copies of the test form in the manual, and spending hours with a calculator figuring out the test results. I could kick myself for wasting all that time. The electronics are so nice to use, I can't express how much it simplified and speeded up my cylinder head testing. I mention PT software because that is what I have on my SF-110. If you check out the forum, Mouse (a forum member and contributor) also makes software.
When I first got my FlowCom, I put the video in a TV in the shop and watched the video while I played arounfd with the FlowCom. It's pretty simple once you get the hang of it.
- can't get him out of his little shop. He did not have the operators manual. I appreciate the input.