Have yall seen this "supercharger" ? thoughts?
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Have yall seen this "supercharger" ? thoughts?
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Joined: Dec 2008
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From: Cedar Park TX
The math behind it first.
He claims 900 CF ( I will assume 900 cubic feet per minute). 1 liter equals .0353 cubic feet. Our Hemi being a 5.7 liter equates to .20121 cubic feet. So for every revolution the engine is consuming .20121 cubic feet of air. At idle, RPM at 650 the engine is inhaling 130.7865 cubic feet of air per minute. Cruising down the highway at 70 mph my truck is turning about 1800 RPM's, so it needs 362.178 cubic feet. When I need to wind it up to pass someone I hit redline at 5600 RPM I need 1126 .776 cubic feet of air. Far exceeding his claimed 900 cubic feet, so it is actually going to be choking the engine.
These things have been around for about 10 years. These guys make them from exhaust fans used in boats to help clear the bilge/engine rooms of exhaust fumes. Think of the fan in the bathroom that helps clear the foul air. Doesn't blow hard at all. The scary thing really about these 'superchargers' is that when the bearing fails, or a fan blade breaks off, the parts get sucked directly into your engine because they are mounted after the filter.
Don't do it, and thinking about it is actually killing brain cells.
Bill
He claims 900 CF ( I will assume 900 cubic feet per minute). 1 liter equals .0353 cubic feet. Our Hemi being a 5.7 liter equates to .20121 cubic feet. So for every revolution the engine is consuming .20121 cubic feet of air. At idle, RPM at 650 the engine is inhaling 130.7865 cubic feet of air per minute. Cruising down the highway at 70 mph my truck is turning about 1800 RPM's, so it needs 362.178 cubic feet. When I need to wind it up to pass someone I hit redline at 5600 RPM I need 1126 .776 cubic feet of air. Far exceeding his claimed 900 cubic feet, so it is actually going to be choking the engine.
These things have been around for about 10 years. These guys make them from exhaust fans used in boats to help clear the bilge/engine rooms of exhaust fumes. Think of the fan in the bathroom that helps clear the foul air. Doesn't blow hard at all. The scary thing really about these 'superchargers' is that when the bearing fails, or a fan blade breaks off, the parts get sucked directly into your engine because they are mounted after the filter.
Don't do it, and thinking about it is actually killing brain cells.
Bill
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The math behind it first.
He claims 900 CF ( I will assume 900 cubic feet per minute). 1 liter equals .0353 cubic feet. Our Hemi being a 5.7 liter equates to .20121 cubic feet. So for every revolution the engine is consuming .20121 cubic feet of air. At idle, RPM at 650 the engine is inhaling 130.7865 cubic feet of air per minute. Cruising down the highway at 70 mph my truck is turning about 1800 RPM's, so it needs 362.178 cubic feet. When I need to wind it up to pass someone I hit redline at 5600 RPM I need 1126 .776 cubic feet of air. Far exceeding his claimed 900 cubic feet, so it is actually going to be choking the engine.
These things have been around for about 10 years. These guys make them from exhaust fans used in boats to help clear the bilge/engine rooms of exhaust fumes. Think of the fan in the bathroom that helps clear the foul air. Doesn't blow hard at all. The scary thing really about these 'superchargers' is that when the bearing fails, or a fan blade breaks off, the parts get sucked directly into your engine because they are mounted after the filter.
Don't do it, and thinking about it is actually killing brain cells.
Bill
He claims 900 CF ( I will assume 900 cubic feet per minute). 1 liter equals .0353 cubic feet. Our Hemi being a 5.7 liter equates to .20121 cubic feet. So for every revolution the engine is consuming .20121 cubic feet of air. At idle, RPM at 650 the engine is inhaling 130.7865 cubic feet of air per minute. Cruising down the highway at 70 mph my truck is turning about 1800 RPM's, so it needs 362.178 cubic feet. When I need to wind it up to pass someone I hit redline at 5600 RPM I need 1126 .776 cubic feet of air. Far exceeding his claimed 900 cubic feet, so it is actually going to be choking the engine.
These things have been around for about 10 years. These guys make them from exhaust fans used in boats to help clear the bilge/engine rooms of exhaust fumes. Think of the fan in the bathroom that helps clear the foul air. Doesn't blow hard at all. The scary thing really about these 'superchargers' is that when the bearing fails, or a fan blade breaks off, the parts get sucked directly into your engine because they are mounted after the filter.
Don't do it, and thinking about it is actually killing brain cells.
Bill
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From: KY
Last edited by tombogue09; Apr 29, 2010 at 09:37 PM.
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From: Gainesville, FL
DarkKnight, your post got me thinking. I have played around a lot with carbs and am familiar with flow ratings associated with carbs. You can put a 650 cfm on a large V-8 and produce up to 400+ hp no problem. The only time I really saw anything in the 900 cfm range was on strokers and high power applications. I did some quick mental math and agree with your numbers, but there is some disconnect here. 900 cfm in a carbeurated equivalent of our engine would be way too much. The only thing I can think of to connect the dots here is that the flow rating is at atmospheric pressure. But the initial air charge in each cylinder is going to be a vacuum because an engine is essentially an air pump. Therefore even at a few mmHg of vacuum the volume of that air can expand by 10-20% (10psia= 7.36 ft^3/lb ; 14psia=.6.25 ft^3/lb). My numbers are rough but fairly representative. This means that a 900 cfm flow rate may be far more than you previously thought. However i still agree this product is junk. And this is in no way an attack on you Knight, just expounding on your insights (which is refreshing since too few people in this country actually use their brain anymore). If anyone has an educated reason for these numbers i would love to here it as right now my theory is just and educated guess.