Re: MAF Flowbench (was Changing 165 / Nother Q)

["Bruce Plecan" <nacelp@bright.net>]

Popular Hot Rodding, (I think Pete Pesterierre (?) was still editor)  in the
Sept Oct isses some years ago built an econo flow bench, I'd tell ya what
year but a "friend" hasn't returned it, and it's been 3 years.  All of them
are kinda noisy, but the leaf jobs Howl......
   Back to back MAFs might not work right, unless you swtich them, and
repeat the test one will be straightening the air even better for the other.
    Might think of a MAP for measuring the low side pressure, and see what
ya get so that x depression you get x measurement.  I'd keep a known MAF for
reference and compare to that, not trying to get x grams per sec, just for
relative flow rates.  Course cutomers in general just look at the numbers.
Course this MOB, is different...
Grumpy


> > Has anyone scientifically measured the effect on readings between an
> > unported, stock, screened MAF and a ported (no sink) and un-screened
MAF? I
> > figgered roughly the percentage of area opened up, and a little tweak
for
> > the reduction in air turbulance and went with that to re-calibrate the
MAF
> > tables. I figgered a shop vac and a y-pipe and a volts meter would give
a
> > ratio as well.  anyone done it?  share?  of coarse the voltage reading
will
> > be lower for the gutted MAF,  but it would be cool to have a graph of
each
> > at all flow levels ;-))
>
> I don't even know who asked this question, that post was waay too fat
> and random ;^) but...
>
> I've got "good intentions" on building a flowbench "calibrator" for a
> MAF, comparing a stock one to a ported one. The trick is NOT a Y-pipe
> but two MAFs in series. Since they're in series, you know that the same
> amount of air has to be flowing through both of them. Measure the stock
> MAF, measure the ported MAF, and there's your scaling. I was going to do
> 2-3 feet of PVC, followed by a stock MAF, then 2-3 feet PVC, followed by
> a ported MAF, then 2-3 feet PVC, followed by a leafblower in suck mode.
> And use some sort of contraption to throttle the air going in....
>
> Of course, it's down on my list of priorities right now, but I was going
> to do it for the LT1 MAFs. Someone may beat me to it, though...
>
> -Andrew
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