Im looking for flow charts for alum or steel pipe in vacum or pressureized. In CFM.

 

material doesnt have much to do with it, but what youre looking for depends a lot on the geometry of the system. youd be best to get a fluids book and you might be able to get some info from there.

what exactly are you looking for?

 

Basicly a 3" pipe vs 2.5" in cfm in a 12" section in vacum.

Someone posted a link while ago but could not find any thing in the search

 

well they can both flow the same really. its just that the 2.5 will have a higher velocity and a greater pressure differential.

if you tell me what exactly youre doing and need I may be able to help you.

i think what you want to know is the pressure drop, and for that you need to calculate CFM drawn by your engine at whatever your goal RPM, and max RPM are. then look at the pressure drops through the two sizes

 

in for more.

 

Say for intake for a GT28RS on a v6 twin turbo.

There was a chart that was mph bassed flow

 

whats the displacement and RPM you want to know the flow rate at?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dfoxengr &raquo;</TD></TR><TR><TD CLASS="quote">whats the displacement and RPM you want to know the flow rate at?</TD></TR></TABLE>I admire your attempts, but I dont think he knows enough to know what he is asking.

 

you calling me stupid?

here shot at it. VG30DETT 3000cc 6500rpm.

My question is. Say at 60mph air flowing throw a 2.5" pipe vs 3" how much cfm .

Im trying to find the chart someone posted one time on intercooler pipe size velosity charts that stated at 60mph this pipe will flow this much cfm and at 100mph this pipe will flow this much air based on a 12" pipe surface.


Modified by JDMCRX at 5:47 AM 6/25/2008

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMCRX &raquo;</TD></TR><TR><TD CLASS="quote">you calling me stupid?

here shot at it. VG30DETT 3000cc 6500rpm.

My question is. Say at 60mph air flowing throw a 2.5" pipe vs 3" how much cfm .

Im trying to find the chart someone posted one time on intercooler pipe size velosity charts that stated at 60mph this pipe will flow this much cfm and at 100mph this pipe will flow this much air based on a 12" pipe surface.


Modified by JDMCRX at 5:47 AM 6/25/2008</TD></TR></TABLE>

Yupppp

jk

 

12" pipe surface doesnt have anything to do with it either. youre just looking for area based volumetric flow.

ill just point you in the right direction.

volume flow will be the [displacement(convert to ft^3)/2]*[rpm/60] in units of ft^3/s

thats how much your engine is sucking at 100% VE

multiply that by something between 70-95%

then divide the new number, still in ft^3/s by the cross-sectional area in ft^2 to get ft/s, then convert that to MPH.

you can reverse or do it in opposite steps too if youd like since you know you want 60MPH velocity for some unknown reason also.

good luck

 

is this what you were looking for

https://honda-tech.com/zerothread?id=1202591

 

Sounds more like a calculation for a ram-air style inlet than for intercooler piping.

 

Yes thats it. I was just looking for a generic charts not enegine specific

Thanks dfoxengr tho

 

That was one. But there was one i saw on here. 2" pipe with so much vacum will flow this much and 4" with this much vacum will flow this one.

We were just trying to figure out the flow difference in a intake pipe for 2.5" to 3"