Couldn't a compressed air tank hold enough air for the second or two it takes for a turbo charger to get up to speed? The pressure could be regulated for a smaller tank at higher than boost pressure.
Bret Cahill
snipped-for-privacy@aol.com (BretCahill) wrote in news: snipped-for-privacy@mb-m06.aol.com:
Sure.....it would work, the problem is not pressure...the problem would be volume, an engine uses a considerable amount of air.
At 100 - 200 psi even an 8 gallon tank would hold the 6 - 12 cubic feet of air that should last the second or two for a turbo to get up to speed.
One or 2 waste gates could keep the back pressure from building up too much.
The air tank would also have much more time to cool off or to be cooled for an intercooler effect.
It is such a simple cheap easy to install addition it's hard to believe the rubber burners haven't tried it.
This is much more of a problem in politics than in technology. They want to have something worthwhile happen "automatically" without any [dumb] human involvement so they are always trying things like mandatory sentencing and other nonsense.
It takes years for them to figger out it doesn't work.
In sharp contrast, if, say, the computer controls on an engine fail, they figger it out eight orders of magnitude faster.
Bret Cahill
A crank driven supercharger requires a lot of work and cost and unreliable parts and necessarily takes up valuable space on the engine.
The tank + turbo system is cheap, simple, efficient, off the shelf, easy to install and has the advantage of flexibility in locating the tank -- or even several smaller tanks -- where space isn't so critical.
The air is intercooled, first, just by sitting in the tank, then again as it goes from the tank through the metal tubing to the engine. Finally it can be cooled again -- this time well below ambient -- by expanding it just before the regulator reduces it to boost pressure.
Then the boost pressure of the air from the regulator/tank system could be set significantly less than that from the turbo charger running at speed and the mass flow rate to the engine wouldn't be affected by the turbo picking up the load.
Bret Cahill
Dear BretCahill:
Like an air starter on a diesel...
David A. Smith
"N:dlzc D:aol T:com \(dlzc\)" N:dlzc1 D:cox T: snipped-for-privacy@nospam.com
A super charger draws a lot of power from the engine, while the tank stores it up when you don't need it, like when smokey is around.
A diesel with an air starter is almost ready to go if you don't need the air for brakes.
Harbour Freight sells a 2 hp compressor 4 SCF/M @ 90 psi 8 gallon tank for $99.
Less than two minutes to recharge.
When you weren't burning rubber you could could use the compressor for construction work.
Bret Cahill
snipped-for-privacy@aol.com (BretCahill) wrote in news: snipped-for-privacy@mb-m06.aol.com:
Hrm....ever deal much with production personnel? I do daily....and while some are sharp as a tack....probably triple that aren't....and they can screw up an anvil..(honestly...I've seen it done...)
That statement comes from my many years as a Mechanical/Production Engineer..directly working on production issues and designing automation for production.
It takes production personnel less than a day to find a way to crash something, no matter how robust, tested, and proofed it is.
Try to package a 8 gallon tank in a vehicle, other than in the trunk. Plus, it's gonna have to be tough as hell to withstand 200 psi in the high vibration environemnts likely to be seen in any operating vehicle - much greater than a shop floor.
Now add plumbing, wastegates, a control system, etc.
Suddenly it's no longer cheap. Feasable maybe, but not cheap.
R. Johnson
BretCahill wrote:
Diesel rigs have been stowing air tanks for years with no problems.
Just tell the cops you have air brakes and air start because of the higher reliability.
Control systems are cheap when the turbo lag ALWAYS amounts to 8 gallons of air.
Cheaper and, when it comes to intercooling, relieving the crankshaft of any additional load and, therefore, burning rubber, better than supercharging.
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