James,
A Toyota (4AGZZE?????) 2 Litre supercharger is over-driven by a large
electric motor I have 2hp ??? Its of a steam boiler pressure feed pump.
The outlet from the supercharger was ducted into a bench manifold with an
adaptor coupling for heads or bits n pieces. I used an inclined tube
manometer that read up to 5" H20 and with a second tube up to 10" H2O.
For small items I ran a bleed fitting (washer and disc) to reduce the flow
rate for small items. The Pitot tube I used came from a scientific supplies
lab in Bayswater that has since gone bust, but any large scientific
equipment supplier will be able to supply pitot's and calibration data for
it. (Not cheap though!!!!! $500 - $700 when I bought mine) The Pitot tube
can be used to directly measure flows at various locations in the device
being measured.
PS the inlet and exhaust badly needs a good silencer system as my
neighbours cracked a wobble over the droning even when silenced.
PPS If you get bored, you can always do some injector flow testing with an
injector test bench and set the injector spray directly into the discharge
air stream with a lighted Bunsen Bunsen burner underneath the air stream!
When you open the injector solenoid the fuel mixed in with the air stream
ignites creating a flame about 15-20ft long. A very speccy flame generator
but I'm not sure if its environmentally responsible? .
Cheers
Feral Errol
----------
From: jamesf <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Subject: Re: Airflow calculations
Date: Tuesday, September 19, 2000 1:51
Errol
Can you tell us more about making this flow bench setup?
I have access to a supercharger, where do I get the rest off the stuff
and what else is needed....
got any Pics of the bits etc?
Cya
JamesF
OZDAT Online
Errol Smith wrote:
> Terry,
> If you want to measure flows for a particular item then a simple flow
bench
> is the answer. I have made up a "home grown" version using an
electrically
> driven Toyota supercharger for the air pump. For the flow measurements I
> used an inclined tube manometer, and a Pitot tube ( accurate bore
> diameter). The amount of flow for a given bore diameter Pitot tube at a
> particular pressure is readily available. I do not know of an easy way to
> do it accurately on an engine in a moving car.
> Craig, any ideas?
> Cheers
> Feral Errol
> ----------
> From: Terry <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED]
> Subject: RE: Airflow calculations
> Date: Thursday, September 14, 2000 11:31
>
> Errol,
> One last question on this - is there any way to measure the pressure
> differential on a particular engine. Like it's easy manifold side, just
> hook
> up a vac gauge and it should be zero but are there any backyard ways of
> measuring the induction side.
>
> Terry
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Errol Smith
> Sent: Thursday, 14 September 2000 10:39 PM
> To: [EMAIL PROTECTED]
> Subject: Re: Airflow calculations
>
> Terry,
> Typically the pressure drop from the input side of the carb to the output
> (engine side) will have a pressure differential of between 1.5 - 2.5 "Hg
@
> Wide Open Throttle (WOT).. The pressure differential largely depends on
the
> engine speed, bore/stroke ratio and camshaft profile.
> Cheers
> Feral Errol
>
--
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James Fitness
Director
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