This is either the greatest or worst idea ever.
04-23-2008, 11:44 PM
#3
Could that restriction damage the engine?
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04-24-2008, 02:20 AM
#8
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Thats different, man. We're talking about basically CAPPING off the exhaust. Turbos don't completely stop the flow of exhaust gases. Worst case I can think of is damage to exhaust valves.
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04-24-2008, 08:25 AM
#9
You can't hurt the motor by plugging the exhaust.
This product looks legit, they sell it at Northern Tool. Looks like a great idea.
http://www.northerntool.com/webapp/w...5091_200335091
This product looks legit, they sell it at Northern Tool. Looks like a great idea.
http://www.northerntool.com/webapp/w...5091_200335091
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04-24-2008, 09:41 AM
#12
Wouldnt it also cause egt's to go up?
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04-24-2008, 11:36 AM
#13
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Well, i would think that it probably has some kind of bypass valve that allows it to maintain pressure in the bag and still keep the exhaust flowing. That way it would still have some flow at all times.
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04-24-2008, 11:46 AM
#14
From the link at the bottom of the paragraph:
There is a hose coming out of it which you connect to the exhaust of your car. In about 30 seconds the bag will have inflated enough to raise your car up off the ground. There’s even a one-way valve to prevent air loss if you decide to turn off your vehicle
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04-24-2008, 12:02 PM
#15
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Devices like this have been around for at least 15 years, probably much longer. Used to see 'em advertised in the JC Whitney catalog. I can't see how it's going to cause any damage to the engine, honestly. Let's do some math.
Let's say that we're lifting the BMW X3 station wagon that they show in the picture. That vehicle has a max gross of about 5 kilopounds. They're lifting half of it. I honestly don't know the exact formula for picking up half a vehicle at an odd angle, so let's err on the worst-case side and say that the bag is hefting 2/3 the weight of the car, or about 3,300 pounds. The bag measures 24" in diameter, giving a frontal area of 452.4 square inches. So, to lift 3.3 klb, it needs to be operating at about 7.4 PSI.
I'm pretty sure that a four-cycle engine can safely work against 7.4 PSI of backpressure. Heck, a turbo Miata with a stock exhaust system is probably close to that when at WOT. The efficiency will be reduced as you'll probably get some reversion towards the very end of the exhaust stroke, but it's not going to cause any actual harm.
By the way, here's the homepage for the company that produces the device: http://www.airjackusa.com/index.htm
Let's say that we're lifting the BMW X3 station wagon that they show in the picture. That vehicle has a max gross of about 5 kilopounds. They're lifting half of it. I honestly don't know the exact formula for picking up half a vehicle at an odd angle, so let's err on the worst-case side and say that the bag is hefting 2/3 the weight of the car, or about 3,300 pounds. The bag measures 24" in diameter, giving a frontal area of 452.4 square inches. So, to lift 3.3 klb, it needs to be operating at about 7.4 PSI.
I'm pretty sure that a four-cycle engine can safely work against 7.4 PSI of backpressure. Heck, a turbo Miata with a stock exhaust system is probably close to that when at WOT. The efficiency will be reduced as you'll probably get some reversion towards the very end of the exhaust stroke, but it's not going to cause any actual harm.
By the way, here's the homepage for the company that produces the device: http://www.airjackusa.com/index.htm
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04-24-2008, 12:09 PM
#16
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Devices like this have been around for at least 15 years, probably much longer. Used to see 'em advertised in the JC Whitney catalog. I can't see how it's going to cause any damage to the engine, honestly. Let's do some math.
Let's say that we're lifting the BMW X3 station wagon that they show in the picture. That vehicle has a max gross of about 5 kilopounds. They're lifting half of it. I honestly don't know the exact formula for picking up half a vehicle at an odd angle, so let's err on the worst-case side and say that the bag is hefting 2/3 the weight of the car, or about 3,300 pounds. The bag measures 24" in diameter, giving a frontal area of 452.4 square inches. So, to lift 3.3 klb, it needs to be operating at about 7.4 PSI.
I'm pretty sure that a four-cycle engine can safely work against 7.4 PSI of backpressure. Heck, a turbo Miata with a stock exhaust system is probably close to that when at WOT. The efficiency will be reduced as you'll probably get some reversion towards the very end of the exhaust stroke, but it's not going to cause any actual harm.
By the way, here's the homepage for the company that produces the device: http://www.airjackusa.com/index.htm
Let's say that we're lifting the BMW X3 station wagon that they show in the picture. That vehicle has a max gross of about 5 kilopounds. They're lifting half of it. I honestly don't know the exact formula for picking up half a vehicle at an odd angle, so let's err on the worst-case side and say that the bag is hefting 2/3 the weight of the car, or about 3,300 pounds. The bag measures 24" in diameter, giving a frontal area of 452.4 square inches. So, to lift 3.3 klb, it needs to be operating at about 7.4 PSI.
I'm pretty sure that a four-cycle engine can safely work against 7.4 PSI of backpressure. Heck, a turbo Miata with a stock exhaust system is probably close to that when at WOT. The efficiency will be reduced as you'll probably get some reversion towards the very end of the exhaust stroke, but it's not going to cause any actual harm.
By the way, here's the homepage for the company that produces the device: http://www.airjackusa.com/index.htm
You sound more like an engineer to me.
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