Pros and Cons ng naka-rekta ang engine fan

[ceekeigh]

Ano po ang pros at cons ng naka-rekta ang engine fan?

Pagka-on ng kotse, andar agad si fan.

[rollyic]

mas malakas ang buga ng hangin...meaning, iwas over heat.

[ceekeigh]

mas malakas ang buga ng hangin...meaning, iwas over heat.

Wala bang masusunog like relay or something? Sensya napo 1st time car owner, I'm starting to learn pa lang yung mga ganito.

[12vdc]

pros: none
cons: matagal bago marating ang "operating temp" dahilan para malakas sa konsumo ng gasolina, makikuryente, masisira kaagad ang fan

[ceekeigh]

pros: none
cons: matagal bago marating ang "operating temp" dahilan para malakas sa konsumo ng gasolina, makikuryente, masisira kaagad ang fan

Salamat po. Now I know.

[dr. d]

bat naman kaya ni-rekta ang fan? i am sure the story behind it is an interesting one..

[ceekeigh]

pros: none
cons: matagal bago marating ang "operating temp" dahilan para malakas sa konsumo ng gasolina, makikuryente, masisira kaagad ang fan

Dito lang ako worried sa engine temperature thinggy. So malakas sya sa gas nun?

[s10pao]

Takes a longer time to reach optimum engine operating temperature.

cons: matagal bago marating ang "operating temp" dahilan para malakas sa konsumo ng gasolina, makikuryente, masisira kaagad ang fan

sirs can you further elaborate? kasi ung thermostat naman ang nag-co-control ng circulation ng coolant dba?

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[ceekeigh]

Mga bossing, yung fan po na nakalagay sa may radiator/EFI. Yun po yung fan na sinasabi ko.

[12vdc]

sirs can you further elaborate? kasi ung thermostat naman ang nag-co-control ng circulation ng coolant dba?

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Rad fan and Thermostat works hand-in hand to maintain coolant temp.

At engine startup, thermostat is closed and rad fan is shut. Coolant circulates in the engine block only thru the bypass valve of the thermostat. When engine reach operating temp, thermostat opens and remains open allowing coolant to circulate from the water pump to the radiator then backto the engine block.

Radiator fan will turn on when the thermal switch sensed that the coolant temp exceeded the limit. This then lowers the temperature thru the heat exchanger(radiator) by transferring heat (thru conduction - air is a heat conductor) from the radiator fins to the ambient air (by turning on the fan thereby blowing air accelerates thermal conduction from the source/coolant to the sink/ambient air).

So imagine what happens when you turn on the rad fan at engine startup, it will take longer for your engine to reach operating temp thereby wasting your time and fuel while idling your engine to reah opeating temp. If you drive the car with cool engine, more fuel will be wasted since you are pumping more fuel to the combustion chamber and most of it escapes.

[Chinoi]

sirs can you further elaborate? kasi ung thermostat naman ang nag-co-control ng circulation ng coolant dba?

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Ang thermostat ay mechanical thermal valve. Di nito pa-circulate ang tubig sa cooling system ng engine kapag malamig pa ang engine. Since pinaandar na kaagad ang radiator fan ay ma-ventilate nito ang engine kaya matagal uminit yun engine. Syempre matagal din mag bago mag circulate ang tubig sa engine. Hindi fuel efficient ang malamig na engine. Saka naka open loop ang computer box ng computer kapag malamig ang engine. Ibig sabihin wala muna control ang computer box at rich fuel mixture muna ang engine habang hindi pa ito uminiinit. Takaw ka sa gas nun kung malamig engine.

Kaya naman design na open loop muna ang computer box or rich fuel mixture ay para bumilis ang pag init ng engine. Pero once na ma reach na yun operating temperature ng engine ay doon na mag close loop or control sa engine ng tamang air fuel mixture para maging fuel efficient ang EFI engine ng Vios.

Conclusion. Mas matagal naka rich fuel mixture ang timpla ng engine habang di naabot ang tamang operating temp ng engine. Hula ko lang.

[falken]

Ano po ang pros at cons ng naka-rekta ang engine fan?

Pagka-on ng kotse, andar agad si fan.

Takes a longer time to reach optimum engine operating temperature.

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[jaggerx3]

How about ung fans na engine driven. Like sa revo namin pagka stat naikot na agad yung radiator fan since engine driven sya

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[12vdc]

How about ung fans na engine driven. Like sa revo namin pagka stat naikot na agad yung radiator fan since engine driven sya

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Same principle lang with most transverse engine. Controlled naman ng viscous-fan-clutch thermostat. Kabaligtaran ng thermostat wax - silicon oil ang nasa loob tumitigas sya habang umiinit so lalong kumakapit at nagiging 1:1 ang ratio ng crankshaft speed at fan speed.

Most transverse engines ganyan na kasi ang design ng cooling system dahil hindi pede lagyan ng viscous fan. Electric fan na lang then lagay ng sensor para automatic na on/off.

[dr. d]

How about ung fans na engine driven. Like sa revo namin pagka stat naikot na agad yung radiator fan since engine driven sya

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1. many modern direct-driven fans have a viscous coupling, sabi nga ni 12 volts. personally, i find this viscous mechanism more of a headache than an advantage...
2. most engines have a thermostat inside them, whether their fans are direct-driven or electric aux fans. the thermostat interferes with radiator-engine block coolant exchange, so that the block gets to optimal temp faster..