Topic: Kohler command head flow numbers

[gtpuller]

heres another poor mans flow bench

http://www.4cycle.com/karting/html/flow_bench.html


I have a question for you guys could you use a vacumn guage to at least get an idea  of whats happening with a particular head. so take a reading of the actual vacumn and then a reading at the intake and the exaust ports paying attention to the difference in the readings. Would this give any meaningful results? Silly? Wrong concept? forget the whole thing?

[gtpuller]

anyone?

[fordman21]

I would think that a flow bench would give you the best results, and it would be tested at 28WC pretty well the standard of the industry. There are some pretty cheap flow bench kits out there by the looks of it if a guy was serious about doing cylinder head mods. Once the valve opens you are going to loose vacuum with a vacuum guage and you really wouldn't know whats happening at each valve lift interval at a certain point otherwise.

[gtpuller]

I would think that a flow bench would give you the best results, and it would be tested at 28WC pretty well the standard of the industry. There are some pretty cheap flow bench kits out there by the looks of it if a guy was serious about doing cylinder head mods. Once the valve opens you are going to loose vacuum with a vacuum guage and you really wouldn't know whats happening at each valve lift interval at a certain point otherwise.

Thanks Ryan I appreciate it.

Tim Johnson

[gtpuller]

heres another poor mans flow bench

http://www.4cycle.com/karting/html/flow_bench.html

http://www.dwyer-inst.com/

this is the instrument company used for the above flow bench, the manometers used are less than $200.00. For you gents that have experience in this would this be a good place for a guy to start if he had the inclination to try this! ENTRY LEVEL CHEAP? The above mentioned flow bench uses a 16" and a 24" U tube (8" and 10" WC) respectively, If I understand the material correctly. Standard flow numbers are generally given at 28"WC? would it matter if the "reference" were different just have to set the vacumn up with a pressure that was compatible with what you are working with? dwyer has a larger manometer up to 18" WC didnt see any others.
probably if i look harder maybe find a larger manometer, 28"WC but these are pretty cheap!

Wouldn't be the standard but since only trying to improve the flow of what you have at hand does it have the potential to work?
only gonna look at improvement of what you start with right?


This is what happens when boredom sets in and you cant sleep, surfin the web!


http://www.flowperformance.com/faq.html

[gtpuller]

found this interesting

http://www.tractorsport.com/cgi-bin/forum/cgi-bin/ikonboard.cgi

and i think i answered my own question about using the smaller manometers from this article

http://en.wikipedia.org/wiki/Air_flow_bench


Most flow testing is done at 10 and 28 inches of water pressure (2.5 to 7 kilopascals

quote from the above article.

Making a little more sense now. but I have a headache. LoL

[gtpuller]

Ryan what flow bench do you use? Is it software driven?



Thanks

Tim Johnson

[fordman21]

Flow Performance, yes it is software driven. It seems to be extremely accurate and consistant.

[Wallbanger]

I bought a Flow Performance 2.0 kit for testing some karting Tilton carbs. I sent them some carbs and they built an adapter for them and flow tested the carbs for me. Then they sold me the whole setup. I was hoping I could find carbs that flowed more than others, but found they all flow pretty much the same. But what I did discover was that I could improve flow about 10 to 15 percent just by doing a few tricks that cost no money, no modification and hardly any time. I was able to apply these tricks to other parts of the intake and exhaust system. Would never have even dreamed this could be done without a flow bench.

Wally

[gtpuller]

thanks yes and its really not that expensive either, and the website for this is in a post above

too much for me right now. I was just tryin to figure out the cheapest way to do it! Honestly at this point the mathematics in converting the readings of the  pressure in the manometers, and  at the pitot tube  to cfm ( flow ) isn,t completely clear to me. Keep readin till I figure it out I guess!!
   

Thanks guys

Tim Johnson

[Rooster]

This one explains things well. I think

http://cid-253920c013930de6.office.live.com/self.aspx/.Public/hyperflow.pdf#resId/253920C013930DE6!200

[fordman21]

Its amazing what little things make a difference, I have new intake manifold and header designs in my head already based on what happens before and after the heads alone.



Here is my set up.

[Rooster]

Have you ever done any flathead flow work?
I am working on a flow bench and wondering how I am going to measure valve lift?

[George Herrin]

Have you ever done any flathead flow work?
I am working on a flow bench and wondering how I am going to measure valve lift?

Make a bridge across the top of head with screwable studs use a dail indicator on stud to measure valve lift

[Rooster]

ok, but when it is on the flow bench...I have to have the head on it?