[Diy_efi] Intake manifold flow testing

[Geddes, Brian J]

Hmm...using a water meter and a leaf blower is an interesting idea.  I =
think I'd need to have air flowing through all 6 runners at once.  What =
I've read suggests that the runners at furthest from the throttle body =
will get more air, because the earlier runners 'siphon' off the =
pressure.  If all the other runners were blocked off, I might not see =
this effect.

Maybe if I put an equal restriction at the end of each runner (fixed =
diameter nozzle, or something),  and fed the leaf blower into the =
throttle body, I could measure the pressure in each runner.

- Brian

>=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
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> 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.
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> -----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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