[Diy_efi] Intake manifold flow testing

[Geddes, Brian J]

What I said below doesn't make any sense.  Ignore the "siphoning" =
comment.  What I've read suggests that the runners furthest from the =
throttle body will get more air.  Don't know why - I'll have to do more =
reading.  :)

- Brian

>=20
> Hmm...using a water meter and a leaf blower is an interesting=20
> idea.  I think I'd need to have air flowing through all 6=20
> runners at once.  What I've read suggests that the runners at=20
> furthest from the throttle body will get more air, because=20
> the earlier runners 'siphon' off the pressure.  If all the=20
> other runners were blocked off, I might not see this effect.
>=20
> Maybe if I put an equal restriction at the end of each runner=20
> (fixed diameter nozzle, or something),  and fed the leaf=20
> blower into the throttle body, I could measure the pressure=20
> in each runner.
>=20
> - Brian
>=20
> >=20
> > There was a guy who did DIY flowtesting using various=20
> > adapters, a low pressure gauge, duct tape, and a leaf blower.=20
> > it may not be high-tech, but I guess it would be able to tell=20
> > you a little something about how well each intake runner flows...
> >=20
> > http://home.earthlink.net/~tmahon281/tech.html
> >=20
> > go down to about 2/3 to 3/4 of the way down the page, you'll=20
> > find the guy's info on it.
> >=20
> > -----Original Message-----
> > From: Geddes, Brian J [mailto:brian.j.geddes at intel.com]
> > Sent: Tuesday, February 11, 2003 3:43 PM
> > To: List for general do-it-yourself EFI talk
> > Subject: RE: [Diy_efi] Intake manifold flow testing
> >=20
> >=20
> > Is there a close enough correlation between EGT and A/F to=20
> > use EGT to estimate the relative airflow differences?  I=20
> > thought that the EGT-A/F connection wasn't very exact...but=20
> > I'm certainly no expert. =20
> >=20
> > - Brian
> >=20
> > > -----Original Message-----
> > > From: Dave Dahlgren [mailto:ddahlgren at snet.net]
> > > Sent: Tuesday, February 11, 2003 12:15 PM
> > > To: List for general do-it-yourself EFI talk
> > > Subject: Re: [Diy_efi] Intake manifold flow testing
> > >=20
> > >=20
> > > The sad part about this problem is that it most likely=20
> > > changes with rpm as well
> > > that is to say they can move around. a rich one at 4500 might=20
> > > be a lean one at
> > > 6000.  You could probably verify they stay the same by using=20
> > > some egt probes and
> > > data logging them along with rpm map and tps..Above all i=20
> > > think i would only
> > > want to add fuel.. Best idea is get a better intake manifold.
> > > Dave
> >=20
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> >=20
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> >=20
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