Cooling issue help please
02-08-08, 12:40 PM
#27
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Search here for what? Thats like how they disproved the removal stock clutch fan is only 1 to 2 HP.. Now they have 25 Dynos from 2 sources that says 11 plus to the wheels with the removal of the fan.
He a grown man, he can decide what he wants to do.
02-08-08, 12:48 PM
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02-08-08, 12:48 PM
#31
When the cap or the thermostat isn't bad, then what are you gonna say..Grow up..keep your comments to yourself.
Search here for what? Thats like how they disproved the removal stock clutch fan is only 1 to 2 HP.. Now they have 25 Dynos from 2 sources that says 11 plus to the wheels with the removal of the fan.
He a grown man, he can decide what he wants to do.
Search here for what? Thats like how they disproved the removal stock clutch fan is only 1 to 2 HP.. Now they have 25 Dynos from 2 sources that says 11 plus to the wheels with the removal of the fan.
He a grown man, he can decide what he wants to do.
02-08-08, 12:51 PM
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on an average automobile you will get like 3hp average out of removing the fan. which in drag racing can mean a 10th. but 11? ill believe it when i see it post them dyno slips.
Im not saying its imopossable, maybe rotarys respod differently to these things but i would need proof, before i got around preaching it.
Im not saying its imopossable, maybe rotarys respod differently to these things but i would need proof, before i got around preaching it.
02-08-08, 12:53 PM
#35
When electrical power is needed from the alternator this means more mechanical power needs to be taken from the engine. Why? Well the alternator doesn't generate power, it converts mechanical energy to electrical energy.
Assuming the alternator converts mechanical power to electrical power with 85% efficiency (i.e. to get 1W of electricity you need ~18% more mechanical power, or 1.18W), you can approximate the horsepower requirement for an electric fan as follows:
Electrical Fan Power * 1.18 = Mechanical HP Requirement from Engine (HP loss)
(Amps x Volts / 745.7) * 1.18 = HP loss
For example, the popular Flex-a-Lite Black Magic 150 takes a rated 14 Amps at 13 Volts - the electrical system's voltage when the alternator is running - resulting in roughly 0.3 HP loss. Thankfully, this isn't much, so HP loss due to an electric fan swap will be minimal.
Interestingly, there is one more efficiency to take into account when comparing CFM (instead of current draw) to horsepower loss. Because the electric fan has to convert electrical power into mechanical power, there is another efficiency factor of perhaps 85%, giving an overall efficiency of mechanical-to-electrical-to-mechanical of 0.85 * 0.85 = 0.72.
Assuming the alternator converts mechanical power to electrical power with 85% efficiency (i.e. to get 1W of electricity you need ~18% more mechanical power, or 1.18W), you can approximate the horsepower requirement for an electric fan as follows:
Electrical Fan Power * 1.18 = Mechanical HP Requirement from Engine (HP loss)
(Amps x Volts / 745.7) * 1.18 = HP loss
For example, the popular Flex-a-Lite Black Magic 150 takes a rated 14 Amps at 13 Volts - the electrical system's voltage when the alternator is running - resulting in roughly 0.3 HP loss. Thankfully, this isn't much, so HP loss due to an electric fan swap will be minimal.
Interestingly, there is one more efficiency to take into account when comparing CFM (instead of current draw) to horsepower loss. Because the electric fan has to convert electrical power into mechanical power, there is another efficiency factor of perhaps 85%, giving an overall efficiency of mechanical-to-electrical-to-mechanical of 0.85 * 0.85 = 0.72.
02-08-08, 12:57 PM
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When electrical power is needed from the alternator this means more mechanical power needs to be taken from the engine. Why? Well the alternator doesn't generate power, it converts mechanical energy to electrical energy.
Assuming the alternator converts mechanical power to electrical power with 85% efficiency (i.e. to get 1W of electricity you need ~18% more mechanical power, or 1.18W), you can approximate the horsepower requirement for an electric fan as follows:
Electrical Fan Power * 1.18 = Mechanical HP Requirement from Engine (HP loss)
(Amps x Volts / 745.7) * 1.18 = HP loss
For example, the popular Flex-a-Lite Black Magic 150 takes a rated 14 Amps at 13 Volts - the electrical system's voltage when the alternator is running - resulting in roughly 0.3 HP loss. Thankfully, this isn't much, so HP loss due to an electric fan swap will be minimal.
Interestingly, there is one more efficiency to take into account when comparing CFM (instead of current draw) to horsepower loss. Because the electric fan has to convert electrical power into mechanical power, there is another efficiency factor of perhaps 85%, giving an overall efficiency of mechanical-to-electrical-to-mechanical of 0.85 * 0.85 = 0.72.
Assuming the alternator converts mechanical power to electrical power with 85% efficiency (i.e. to get 1W of electricity you need ~18% more mechanical power, or 1.18W), you can approximate the horsepower requirement for an electric fan as follows:
Electrical Fan Power * 1.18 = Mechanical HP Requirement from Engine (HP loss)
(Amps x Volts / 745.7) * 1.18 = HP loss
For example, the popular Flex-a-Lite Black Magic 150 takes a rated 14 Amps at 13 Volts - the electrical system's voltage when the alternator is running - resulting in roughly 0.3 HP loss. Thankfully, this isn't much, so HP loss due to an electric fan swap will be minimal.
Interestingly, there is one more efficiency to take into account when comparing CFM (instead of current draw) to horsepower loss. Because the electric fan has to convert electrical power into mechanical power, there is another efficiency factor of perhaps 85%, giving an overall efficiency of mechanical-to-electrical-to-mechanical of 0.85 * 0.85 = 0.72.
02-08-08, 01:01 PM
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here it is again, dyno sheets and all.
02-08-08, 01:06 PM
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I've read it before. I'm skeptical, i'm suprised that "add the Tornado to the intake piping isnt in there.
While i'm sure none of the things he suggests are bad ideas, i still doubt that you can get 11 hp from installing an electric fan.
While i'm sure none of the things he suggests are bad ideas, i still doubt that you can get 11 hp from installing an electric fan.
02-08-08, 01:28 PM
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wires don't wear out from eletrical current, they are designed to carry.
I burn up more alternators from doing 7800 rpms, that includes all my RX7s that have E fans, including all my freinds that use them also.
02-08-08, 01:30 PM
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Right but the connections get corroded and the wires get brittle with age and from the heating and cooling of being under the hood. as well as salt from the road and rust and dirt. old wires = less reliable wires.
02-08-08, 01:40 PM
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as the metal in the wire gets more brittle with age (as all metal will) it's resistance values will go up. which will put values into the wrong ranges. = problems.