Eaton superchargers and MAF sensors

Mon Jul 30 09:36:45 GMT 2001

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Help me out, I don't understand where the reversion would be happening.  =
Maybe I'm missing the point.

I'm guessing that you are referring to the effect where a MAF indicates =
an air flow higher (some times much higher) than the actual air flow due =
to the air passing by the sensor more than once due to reversion at the =
sensor.

Usually with a roots type blower the fuel is applied before the blower, =
therefore that is where the MAF is taken.  Therefore, it seems that with =
a positive displacement blower there would be no reversion from inlet =
port / cam effects. =20

The roots type blower itself is a pulsing device and would cause a =
reversion like effect above the blower regardless of the load, but I =
believe would not cause any problems with increasing the apparent MAF =
output.
  ----- Original Message -----=20
  From: ABNENGINEERING at cs.com=20
  To: diy_efi at diy-efi.org=20
  Sent: Thursday, July 26, 2001 1:29 PM
  Subject: Eaton superchargers and MAF sensors

  Some talk was made about reversion effects confusing MAF sensors...My=20
  question is if Eaton (roots type but with vanes twisted into a 60 =
degree=20
  helix) superchargers would exacerbate or help to eliminate this =
problem?=20

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<BODY bgColor=3D#ffffff>
<DIV><FONT color=3D#008080 size=3D2>Help me out, I don't understand =
where the=20
reversion would be&nbsp;happening.&nbsp; Maybe I'm missing the=20
point.</FONT></DIV>
<DIV><FONT color=3D#008080 size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT color=3D#008080 size=3D2>I'm guessing that you are referring =
to the=20
effect where a MAF indicates an air flow higher (some times much higher) =
than=20
the actual air flow due to the air passing by the sensor more than once =
due to=20
reversion at the sensor.</FONT></DIV>
<DIV><FONT color=3D#008080 size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT color=3D#008080 size=3D2>Usually with a roots type blower the =
fuel is=20
applied before the blower, therefore that is where the MAF is =
taken.&nbsp;=20
Therefore, i</FONT><FONT color=3D#008080 size=3D2>t seems that with a =
positive=20
displacement blower there would be no reversion from inlet port / cam=20
effects.&nbsp; </FONT></DIV>
<DIV><FONT color=3D#008080 size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT color=3D#008080 size=3D2>The roots type blower itself is a =
pulsing device=20
and would cause a reversion like effect above the blower regardless of =
the load,=20
but I believe would not cause any problems with increasing the apparent =
MAF=20
output.</FONT></DIV>
<BLOCKQUOTE=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #008080 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=3DABNENGINEERING at cs.com=20
  href=3D"mailto:ABNENGINEERING at cs.com">ABNENGINEERING at cs.com</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> Thursday, July 26, 2001 =
1:29=20
  PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Eaton superchargers =
and MAF=20
  sensors</DIV>
  <DIV><BR></DIV><FONT face=3Darial,helvetica><FONT size=3D2>Some talk =
was made=20
  about reversion effects confusing MAF sensors...My <BR>question is if =
Eaton=20
  (roots type but with vanes twisted into a 60 degree <BR>helix) =
superchargers=20
  would exacerbate or help to eliminate this problem?</FONT>=20
</FONT></BLOCKQUOTE></BODY></HTML>

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