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Can you use a mechanical supercharger to compress and
store air in a tank to 150psi?
The idea is that if I mount a supercharger to my diesel
engine; and have a gate valve solonoid between the
supercharger and the engine intake; that switches under
braking or through manual switch at idle-
simultaneously
diverting the airflow from the supercharger to a tank to
store, and opens another port to allow the engine to
naturally aspirate. The gate valve solonoid could close
under acceleration or manual switching so the engine could
return to a charged intake.
Would this work?
It's for 4wd endurance remote application and not really for
performance or power increases.
It would eliminate the need for a seperate compressor to
run air tools, shocks, air diff locks, re-inflate tyres etc.
Cheers,
Glenn
idriveakingswood@hotmail.com
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how much do superchargers charge ? I think it's 8psi, which isn't going to go a long way towards 150psi. |
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It used to be common'ish practice for to replumb an engine such that one of the cylinders was used to power an air-driven device or fill a tank. DD's are sorta famous for it; probably break a petrol engine doing that. Over 200psi easy. |
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(your e-mail can go on your account page... unless this is your only post it'll save typing. ) |
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//how much do superchargers charge ? I think it's 8psi//
I assume that's atmospheric (14.7psi) + 8 psi?
If not, then superchargers suck. |
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My duece-anna-half has no supercharger (it has a turbo,
tiny in comparison to its displacement), but it does have
an integral compressor, run from the serpentine belt, that
powers the air-over-hydro brakes (most big trucks do). I've
modified it to charge an air tank I installed beneath the
bed, which provides pressure for pnuematic tools and
pressurizes a water tank. That's right, my duece has
running water. I made my modification such that pressure
for the onboard accessories is only drawn from the
compressor when the parking brake is set. |
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Aftermarket add-ons exist for 4x4s that closely resemble
my home-built system. I've been thinking about getting one
for my Jeep. |
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In short, I'm not sure how this idea differs much from
existing onboard compressors. |
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Yes, that is, in fact, exactly what they do. Remember that
8 psi is a helluva lot of pressure when it's being rammed
through a valve aperture. |
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//I assume that's atmospheric (14.7psi) + 8 psi?//
8psia (absolute) + atmospheric pressure = 8psig (guage). |
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Your assumption would only be valid precisely at sea level. When not specified, psi(guage) is generally assumed, unless you're in a non-atmospheric environment. |
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This is a well-thought-out idea. After doing a little
research, I'm not sure if you could work up 150psi by
tapping your 'charger, and if you could it would mean
running at sustained high revs. From one 4x4 nut to
another, get yourself an aftermarket compressor. The
mechanical ones that run off the belt are better than the
electrics, but harder (read: more fun) to install. |
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Welcome to the HalBakery, [cruiser]. Hope you stick
around. Don't worry, the insanity is infectious. |
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A Kingswood is a 60-70's model Holden (GM) built in Australia. Mine died a long time ago but the email lives on...
I know it's lost energy but i was hoping not to mess with the exhaust.
What happens after the charged air reaches >8psi? Would the air blow back through the charger? |
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It would, as the 8psi would not open a non-return
valve if the pressure downstream from the valve
was greater than 8psi over atmospheric. |
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It might be possible to run one cylinder (of 6 or 8)
as a compressor, using a Schrade (or similar) non-
return valve in the plug port. Petrol engines
usually run at 8-10 Bar maximum, though I'd be a
little worried about blow-by through the piston
rings. Diesel engine would do it much better,
with compression reaching 25-40 Bar, in some
engines. |
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Technically you should be able to store air pressure using a forced air system. The problem lies in the complexity of a truck's air system that usually requires air compressor, dryer, governor, and air tanks. The governor determines the loaded/ unloaded cycles and basically switches the air compressor modes. You would still need a governor in your new arrangement, but that would take a bit of engineering to make work. You can't just have a turbo ramming air into a pressure vessel and rely on a purge valve to handle the excess. The other thing is that you wouldn't want to be messing with your turbo unless you really knew what you were doing. The engine still needs turbo injection for proper fuel mixture even at idle. |
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An alternative idea would be to completely remove your turbo and put in an air compressor system. Use the air system to inject clean dry cool air into the engine from the air tanks. Diesel engines gulp air, so that's going to be quite an air system. |
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Or you could just mount an AC compressor, apparently they do quite nicely for providing large volumes of compressed air. |
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Well, yeah, but where's the excitement? I mean, that's
almost never going to unexpectedly explode, is it? |
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