I checked many sites and seem not to understand the numbers recieved from the flow bench. WHen I ported my head I was told the work that I recieved was a real good job. I am just going off from what the shop is saying.. This shop that did the work is known for his expertise. What I want to know is what is considred good numbers as results from your port job. For all others that have put there head on the flow bench what numbers did you come out with..........

296 cfm In
191 cfm ex

 

I would also like to know

 

bump

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by edulerp97 &raquo;</TD></TR><TR><TD CLASS="quote">I checked many sites and seem not to understand the numbers recieved from the flow bench. WHen I ported my head I was told the work that I recieved was a real good job. I am just going off from what the shop is saying.. This shop that did the work is known for his expertise. What I want to know is what is considred good numbers as results from your port job. For all others that have put there head on the flow bench what numbers did you come out with..........

296 cfm In
191 cfm ex</TD></TR></TABLE>
A little searching could have given you something ....

http://www.alaniztechnologies.....html

Keep in mind that flow numbers can be measured many different ways. Be prepared to convert in/H20 to in/Hg at various pressure levels.

 

I am still doing alittle reading, but it's all confusing still. Sometimes I understand better when Another person explains it to me then just reading it. Pretty much Now I just want to compare my numbers to what others have.

I seem to notice that everybody talks about how they got their head ported and ect... Nobody not once that I have notice ever said they tested on a flow bench. SO I am curious.... How do I know the work recieved is legite. For all we know other luders that got there head ported probably recieved a **** poor job.. If not lets see the numbers....

If you know how to explain don't hold the knowlegde that's why they have these forums for to help others out like myself. It's not like I am asking what is the best intake, headers, and exhaust for my care or something like that.....

 

I don't understand why everyone worships what flowbenches tell you.

There is MUCH more to flow than just how much air you can force through the thing. Ever heard of velocity?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LudeyKrus &raquo;</TD></TR><TR><TD CLASS="quote">I don't understand why everyone worships what flowbenches tell you.

There is MUCH more to flow than just how much air you can force through the thing. Ever heard of velocity?</TD></TR></TABLE>

Keep in mind that flowbenches also vary from each other. So if someone tells you you have X amount of airflow from their flowbench and you put it on another flowbench you monst likely end up with a different number. Not really a bad thing its just that most machine shops may claim big flow numbers but that could also be their flowbench reads high. When chosing a machine shop to do your port and polish work you should base them upon thier past workmanship not their flowbench claims.

p.s. im drunk right now so i hope this makes sense, it does to me...

 

the same thing goes for people who use dynojets, then those who use mustang dynos.... i think we should all protest and not use dynos altogether, anyone else like this idea?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMF22B &raquo;</TD></TR><TR><TD CLASS="quote">the same thing goes for people who use dynojets, then those who use mustang dynos.... i think we should all protest and not use dynos altogether, anyone else like this idea?</TD></TR></TABLE>
how about lets all just give aproximations instead of exact numbers, and we can keep using any type of dyno for tuning purposes. for example say "i have about 200hp to 220hp" instead of "i have 214.89hp" because after all every bodies car will change hp from day to day depending on many different factors.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LudeyKrus &raquo;</TD></TR><TR><TD CLASS="quote">I don't understand why everyone worships what flowbenches tell you.

There is MUCH more to flow than just how much air you can force through the thing. Ever heard of velocity?</TD></TR></TABLE>

by definition, Flow (Rate) is Q = Area * Velocity.

By virtue of the continuity equation, given a certain flow rate, A1V1=A2V2, so inevitably, if V1 &gt; V2, it must mean that A1 &lt; A2.

though applying bernoulli's equation to a non-ideal, compressible, and turbulent flow would be complicated as ****, what we do know is that a restrictive inlet cross sectional area would limit how much airflow could be delivered to the head (whereever that restriction is, the intake, the IM, the head, etc) since the 1 ATM of pressure would meet more backpressure from the bottleneck and not effectively force more air into the system.

 

That kinda makes a little more since....