Fan HP Usage
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Thread: Fan HP Usage

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    Opeler Yellow73GT's Avatar
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    Fan HP Usage

    I don't know if any of you guys have been following these guys, but I thought the information was interesting enough that I should share.

    https://www.youtube.com/watch?v=ZXdLgaFXZzs
    "Be Water, My Friend" Bruce Lee, December 9, 1971

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    Opelnut opelnut_1's Avatar
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    Very interesting

    My Question is which provides better cooling cause in the Gt's case that should be more of a concern..
    My Collection:
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    Pedal Smasher Autoholic's Avatar
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    I've watched some of their other tests, they usually are interesting.

    As for which fan option is better for cooling, well the fan that robs the most power will be the best fan for cooling. The reason why is simple, the more air the fan pulls through the radiator, the more power it will consume to do so. But an effective cooling system is far more than just the fan. The radiator, type of coolant, thermostat, airflow and shroud / no shroud all play a part. It's better to focus on the needs of the whole system than to just go for the most extreme fan you can find.
    ~Joe
    "Autoholism is an incurable addiction medicated daily with car porn." ~Me

    "the sickest of the sick — a car guy who is collecting parts for the restoration of a car he doesn’t even own yet." ~Anonymous

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    Opeler Yellow73GT's Avatar
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    Quote Originally Posted by opelnut_1 View Post
    My Question is which provides better cooling cause in the Gt's case that should be more of a concern..
    When I was looking for any prior discussions on cooling system stuff to see if fans had been discussed in this manor, instead I spent to much time reading other interesting things that distracted me, and after way too long decided to just post it.

    But to that point, as Autoholic has said, it's the entire cooling system as a whole, not any one part. I for one got to thinking about an electric fan after seeing this, simply because it would draw less hp from an already overtaxed little engine (relatively speaking). I ran some numbers on a hp/1/4mile calculator and 10 horsepower on a 2200 pound car means something

    Your ET / MPH computed from your vehicle weight of 2200 pounds and HP of 100 is 16.32 seconds and MPH of 82.81 MPH.
    (imagine factory stock)
    (now imagine modified with electric fan for the next 2 lines)
    Your ET / MPH computed from your vehicle weight of 2200 pounds and HP of 105 is 16.06 seconds and MPH of 84.16 MPH.
    Your ET / MPH computed from your vehicle weight of 2200 pounds and HP of 110 is 15.81 seconds and MPH of 85.48 MPH.

    I wouldn't think the little factory stock fan on the 1.9 would rob more than 10 horse, but who knows? And if it is stealing 10 horse thats a full half second in the quarter mile, only other way to gain that in a 1/4, without actual engine modification $$ is to shave off 500 lbs. (Rule of thumb 100 lbs =.1sec) I like cheap horsepower, so the idea of switching to an electric fan and maybe aluminum radiator for cooling efficiency wouldn't be such a bad idea after all. Hmmmm.
    "Be Water, My Friend" Bruce Lee, December 9, 1971

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    power loss from cooling

    Hi, The obvious advantage of electric fans is they only need run when needed.
    When street racing in my teens (40 years ago) I found disconnecting my alternator made a noticeable difference, every thing run off the battery for the duration of the race. You could do similar and disable the fan with a micro switch/relay on full throttle. The other thing we found affecting cooling was the air flow to the radiator was blocked partly by putting an electric fan in front of the radiator unless a short circuit was placed across it when not in use to stop it free wheeling in the air flow.

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    Pedal Smasher Autoholic's Avatar
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    There is no need to create a switch to disable a cooling fan in a GT. With a water pump driven fan, you could use a clutch actuated fan. It is only used when needed, so it shouldn't consume as much power. If you want to go with an electric fan, there is no reason to mount it in front of the radiator. Just ditch the water pump driven fan. Mounting a fan in front of the radiator is the worst thing you can do, you're impeding the flow of air from the front of the vehicle. Heat exchangers that move through the air work the best by pulling oncoming air through the radiator with a fan.
    ~Joe
    "Autoholism is an incurable addiction medicated daily with car porn." ~Me

    "the sickest of the sick — a car guy who is collecting parts for the restoration of a car he doesn’t even own yet." ~Anonymous

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    7,000 Post Club My location wrench459's Avatar
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    We did "it" several different ways.
    One was to warm up the engine and gear oils to around 140F
    At the finish line well over 270

    Si vis pacem, para bellum "If you want peace, prepare for war"

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    OpelGT.com Übermoderator My location kwilford's Avatar
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    Quote Originally Posted by Autoholic View Post
    ... there is no reason to mount it in front of the radiator. Just ditch the water pump driven fan.
    Except there isn't usually enough room on a stock Opel GT between the water pump and the radiator for an electric fan. Do you have an Opel yet Joe?
    P.J. Romano and slracer like this.
    Keith Wilford
    Working on the bare-metal, nut & bolt rotisserie restoration of my '71 Opel GT, and may have another GT to build next...

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    cooling for less power loss

    If you have to put the electric fan in front of the radiator it won't block air flow if you stop it free spinning with the air flow. It is the spinning that blocks the air to stop a 12v dc fan from spinning you use a relay so when it's off the relay puts a short across the relay. It stops it because if you spin a dc motor it acts as a generator and the short put a big load on it, it can't push.
    Turning off the alternator at full throttle would remove electrical load what ever it is fan or what ever.
    Some water pumps don't pump properly at high rpm. reducing crank pulley size 10 percent will reduce power loss on all accessories. Some cars this works well and others need the pulley they have.
    alex
    davegt27 likes this.

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    Pedal Smasher Autoholic's Avatar
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    Quote Originally Posted by kwilford View Post
    Except there isn't usually enough room on a stock Opel GT between the water pump and the radiator for an electric fan. Do you have an Opel yet Joe?
    No, I have seen a few GT's that have done it, which is why I mentioned it. There is a GT in Orlando I'm rather interested in, and I'll be in Orlando in later July...
    ~Joe
    "Autoholism is an incurable addiction medicated daily with car porn." ~Me

    "the sickest of the sick — a car guy who is collecting parts for the restoration of a car he doesn’t even own yet." ~Anonymous

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    Opeler
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    Interesting test and discussion, especially if one owns a small block Chevrolet (SBC).

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    Opel Intern Swiftus's Avatar
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    Quote Originally Posted by Yellow73GT View Post
    Like a current vid where you can catch a glimpse of a drag GT
    You mean the Gray and Red GT on Roadkill? Yeah, rolled through the shot @ 28:50.

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    Quote Originally Posted by Yellow73GT View Post
    As a general rule, I have stopped coming here (this crappy site) ...
    You should have continued to live by your own self-inflicted rule.
    kwilford, Ooooner, Lindsay and 4 others like this.
    "LIKE" my post or my cat will bite your nose off!

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    Just Some Dude in Jersey My location The Scifi Guy's Avatar
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    Mods: Feel free to merge any useful posts from my other erroneously started thread on this subject into this one.

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    Quote Originally Posted by Yellow73GT View Post
    As a general rule............... forearmed.
    You need to hook yourself up to a battery mate, and get a positive charge going. Your shirt should read negative earth.
    ~Joe
    "Autoholism is an incurable addiction medicated daily with car porn." ~Me

    "the sickest of the sick — a car guy who is collecting parts for the restoration of a car he doesn’t even own yet." ~Anonymous

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    7,000 Post Club My location wrench459's Avatar
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    Quote Originally Posted by gt alex View Post
    If you have to put the electric fan in front of the radiator ...
    Turning off the alternator at full throttle would remove electrical load what ever it is fan or what ever.
    alex
    Alex, I've seen a gain of 3-5 HP while on a dyno.

    Si vis pacem, para bellum "If you want peace, prepare for war"

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