hey guys i just bought and electric fan and i have a stock 87 rx7 non turbo...... what size fan should i have so my car wont over heat!

 

Uh, shouldn't you ask the question, THEN get a fan?

Once you have a fan, why ask the question? You already plan to use it or you wouldn't have bought it.

Good Luck.

 

This has been covered at least 100 times. Stock fan is great, there is little gain from electric fan other then appeareance or clearence issues.

 

Actually, I would disagree.

A properly installed electric fan has the advantage of providing cooling when it's most needed- at idle when stopped, which is just when the stock mechanical fan is doing the least work. The electric can also be set to stop when it's not needed- on the highway, when the stocker is working the hardest.

There is nothing wrong with the stock unit, assuming the thermoclutch is in perfect shape but a good electric fan is a better solution.

The electric fan won't save you any power, which is a claim commonly put forth but I think it's a better solution if properly installed.

 

http://aaroncake.net/RX-7/efaninstall.htm

 

The stock fan doesn't run while on the highway it just freewheels. If it is running on the highway it is broken.

 

This is a common misconception. The viscous van clutch cannot completely disengage. In complete 'disengage mode' the fan clutch is still spinning the fan at 20-30% of engine speed. At max engagement, the fan is at 85-90% shaft speed.

So, let's do some math, shall we?

At idle, my rpms are 800 rpm. 85% of this is 680 rpm, 90% is 720 rpm.

In my RX7 engine speed on the highway is 3000 rpm. 20% of 3000 is 600 rpm. 30% is 900 rpm.

Now we can see that if the engine is completely warm, A/C running and in need of the complete capacity of the cooling fan at idle, the fan can only spin at about the same speed as the fan spins in 'disengaged' mode on the highway. One should see here the inherent flaw in viscous cooling fans.

Now spin the FC fan at 720 RPM. Forget about how fast the car is going. Tell me 900 rpm does not take engine power and use fuel.

http://findarticles.com/p/articles/m...65/ai_57044400
http://www.haydenauto.com/products/f...fan-blades.htm


Don't be an internet parrot. If you just repeat stuff you read on forums, then you are not helpful to any discussion. You are not ignorant. You are stupid.
Note that stupid is worse than ignorant.

And learn to spell, or at least use spell check.

Class dismissed.

 

To the OP - seriously? You bought a fan and then want to know if it's ok? REALLY?

ZOMGWTFBBQ!!!!!! ACTUAL NUMBERS ON TEH INTERNETS REGARDING E-FANS!

Jack - I wish there was some kind of applaude smiley, I would use it.

 

a stock car should NOT be overheating.

 

OK.
When the car was new, it probably didn't.
Unfortunately, 20 years later, many (maybe most) of the stock thermoclutches are worn out and need replacing. At over $200 a pop new that's a compelling argument for an electric fan right there.

 

I'm closing this topic.

Fan discussions have been beat to death here. The result is the same over and over. The same misinformation is posted, then corrected, then the argument over the correction ensues.

Electric fans are such a common question they are covered in the FAQ. A simple search for "electric fan", "electric fan recommendations" and variations on that will turn up a staggering amount of information and past topics.