[Diy_efi] formulas for CFM rates
Oolan Zimmer
ozimmer at softhome.net
Tue Dec 16 01:00:24 GMT 2003
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MessageIt's more complicated than just bore size, you need to consider =
changes in air velocity too.
I would guess somewhere around 600 CFM for a 75mm throttle body. But =
again, other things influencing turbulence and air velocity will have =
the biggest impact here.
Oolan Zimmer
ozimmer at softhome.net
----- Original Message -----=20
From: Mark Linder=20
To: 'A list for Do-It-Yourself EFI'=20
Sent: Monday, December 15, 2003 6:34 PM
Subject: RE: [Diy_efi] formulas for CFM rates
Sorry, I should have been more specific - I need to calculate the CFM =
of air through a throttle body.
Thanks!
Mark
-----Original Message-----
From: diy_efi-bounces at diy-efi.org =
[mailto:diy_efi-bounces at diy-efi.org] On Behalf Of Oolan Zimmer
Sent: Monday, December 15, 2003 4:18 PM
To: A list for Do-It-Yourself EFI
Subject: Re: [Diy_efi] formulas for CFM rates
Isn't the CFM of a 4-cycle engine just the displacement/2 x RPM? 1 =
liter =3D .0353147 CF.
Oolan Zimmer
ozimmer at softhome.net
----- Original Message -----=20
From: Mark Linder=20
To: diy_efi at diy-efi.org=20
Sent: Monday, December 15, 2003 5:50 PM
Subject: [Diy_efi] formulas for CFM rates
Back on the old list someone had posted the formula for =
calculating CFM based on bore size. Does anyone have that formula?
Also, if anyone knows the CFM rating of a 75mm Mustang style =
throttle body, please post it.
Thanks!
Mark
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<DIV><FONT face=3DArial size=3D2>It's more complicated than just bore =
size, you need=20
to consider changes in air velocity too.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>I would guess somewhere around 600 CFM =
for a 75mm=20
throttle body. But again, other things influencing turbulence and =
air=20
velocity will have the biggest impact here.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Oolan Zimmer</FONT></DIV>
<DIV><FONT face=3DArial size=3D2><A=20
href=3D"mailto:ozimmer at softhome.net">ozimmer at softhome.net</A></FONT></DIV=
>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<BLOCKQUOTE=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Dmark.linder at verizon.net =
href=3D"mailto:mark.linder at verizon.net">Mark=20
Linder</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Ddiy_efi at diy-efi.org=20
href=3D"mailto:diy_efi at diy-efi.org">'A list for Do-It-Yourself =
EFI'</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Monday, December 15, 2003 =
6:34=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> RE: [Diy_efi] formulas =
for CFM=20
rates</DIV>
<DIV><BR></DIV>
<DIV><SPAN class=3D414163300-16122003><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>Sorry, I should have been more specific - I need to calculate =
the=20
CFM of air through a throttle body.</FONT></SPAN></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2></FONT> </DIV>
<DIV> </DIV>
<DIV align=3Dleft><FONT face=3DArial color=3D#0000ff =
size=3D2>Thanks!</FONT></DIV>
<DIV align=3Dleft><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT> </DIV>
<DIV align=3Dleft><FONT face=3DArial color=3D#0000ff =
size=3D2>Mark</FONT></DIV>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
<DIV></DIV>
<DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr =
align=3Dleft><FONT=20
face=3DTahoma size=3D2>-----Original Message-----<BR><B>From:</B> <A =
=
href=3D"mailto:diy_efi-bounces at diy-efi.org">diy_efi-bounces at diy-efi.org</=
A>=20
[mailto:diy_efi-bounces at diy-efi.org] <B>On Behalf Of </B>Oolan=20
Zimmer<BR><B>Sent:</B> Monday, December 15, 2003 4:18 =
PM<BR><B>To:</B> A=20
list for Do-It-Yourself EFI<BR><B>Subject:</B> Re: [Diy_efi] =
formulas for=20
CFM rates<BR><BR></FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Isn't the CFM of a =
4-cycle engine just the=20
displacement/2 x RPM? 1 liter =3D .0353147 CF.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Oolan Zimmer</FONT></DIV>
<DIV><FONT face=3DArial size=3D2><A=20
=
href=3D"mailto:ozimmer at softhome.net">ozimmer at softhome.net</A></FONT></DIV=
>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<BLOCKQUOTE=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- =
</DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Dmark.linder at verizon.net=20
href=3D"mailto:mark.linder at verizon.net">Mark Linder</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Ddiy_efi at diy-efi.org=20
href=3D"mailto:diy_efi at diy-efi.org">diy_efi at diy-efi.org</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Monday, December 15, =
2003 5:50=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> [Diy_efi] formulas =
for CFM=20
rates</DIV>
<DIV><BR></DIV>
<DIV><FONT face=3DArial size=3D2><SPAN =
class=3D938244723-15122003>Back on the=20
old list someone had posted the formula for calculating CFM based =
on bore=20
size. Does anyone have that formula?</SPAN></FONT></DIV>
<DIV><FONT face=3DArial size=3D2><SPAN=20
class=3D938244723-15122003></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2><SPAN =
class=3D938244723-15122003>Also, if=20
anyone knows the CFM rating of a 75mm Mustang style throttle body, =
please=20
post it.</SPAN></FONT></DIV>
<DIV><FONT face=3DArial size=3D2><SPAN=20
class=3D938244723-15122003></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2><SPAN=20
class=3D938244723-15122003>Thanks!</SPAN></FONT></DIV>
<DIV><FONT face=3DArial size=3D2><SPAN=20
class=3D938244723-15122003></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2><SPAN=20
class=3D938244723-15122003>Mark</SPAN></FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV align=3Dleft>
<DIV align=3Dleft><FONT face=3DArial size=3D2><A=20
href=3D"http://www.newsolutionsnw.com/"></A></FONT></DIV></DIV>
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