Turbo for flowbench

[Bryon Hargis]

That is correct, turbo cars won't make boost till you give them something to 
work off of, which is waste energy in the exhaust.  Your car doesn't waste 
much energy down the exhaust until its under load.

The a/c compressor won't work, as those are for high pressure, but not high 
flow. (Ones I have seen anyway) Using one engine to drive another will work, 
but is not efficient at doing it (to many moving parts/friction).  The best 
choice is the impeller idea.  However, you just described a commercial 
supercharger.  No reason to reinvent the wheel.  To get good performance 
from a supercharger in terms of high pressure AND high flow, tolerances must 
be very close at very high RPM.  I don't think you would get acceptable 
results out of something you just rigged up, and you sure as hell would need 
to be careful that whatever you made could take being spun up to however 
fast.

You could take a junkyard 4 cylinder, mount it to a stand, and spin up a 
appropriately sized S/C.  But I don't think it would be economical versus 
buying 20 vacuum motors from grainger and setting up a 150 AMP service to 
them ($1.2K)

Bryon

----Original Message Follows----
From: "marko.cosic" <marko.cosic at ntlworld.com>
Reply-To: diy_efi at diy-efi.org
To: <diy_efi at diy-efi.org>
Subject: Re: Re:Turbo for flowbench
Date: Mon, 4 Feb 2002 21:50:37 -0000

I forgot to address the second idea, but again, it will not work without
load.  I mean think about it, with the wheels in the air, how much throttle
does it take to get your engine to redline and how much air are you flowing
to make that insignificant amount of power?

You would need a load bearing dyno to do either of what you mention, if your
going that far.

----

If one were to connect a port to a car's intake system, so that it had to
breathe through it, surely the running engine, even on full throttle 
opening,
would behave as if the throttle was only open to the equivalent area of the
port?

I don't think the engine would appreciate being run with 25" water 
backpressure
on the exhaust either.

If the turbo was not pressurising the engine but the flowbench instead, 
surely
it would be a funny 'hybrid' jet engine - the piston engine being both the
burner and compression stages for the turbine wheel?

I "own" a turbo car, but have yet to get around to getting it running again, 
and
am not yet driving. I assume from your posts a turbocharged engine only 
develops
boost when its under load?

My two suggestions for a really off the wall way of getting 'high' pressure,
high-flow air:

Air can be pumped with a centrifugal (spelling?) fan. Imagine: taking an 
engine,
and somebody who knows the crude basics of designing such fans, and welding
vanes onto the flywheel that are a very close fit into the bellhousing. Now 
add
a plate over the end of the bellhousing, a very close fit between it and the
vanes, with a hole in the centre to suck through. Now remove the starter 
motor -
this is your air outlet. Quick flick on a starting handle and jobs good - 
high
volume air pump. Regulator then needed to bled away excess air to maintain
pressure at 25" water.

Or: 1 engine driving another purely as an air-pump

Or: 1 engine driving several air-conditioning compressors as an 
air-pump/garage
compressed air supply. I believe the 'York' compressors are the ones that 
have
integral oil rather than mixing the oil with the A/C gas.

Marko



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