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Stock Engine Fan Question

undertoe

By undertoe,
in Engines & Forced Induction

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GTR-Dad Explorer

GTR-Dad

Posted
Posted
Is it worth replacing the stock engine fan on a rb20det with an electric unit to gain extra power ? Is this a common mod or do most people not bother?

I've heard you can expect 10-15 hp more from an RB26DETT. Not sure how the stock fans compare between this and the RB20, but I'll bet you'd realize a gain.

blind_elk Grand Master

blind_elk

Posted
Posted

My experience has been that it's not worth an engine for the sake of a few kW. I could not keep the engine properly cooled after I installed a thermo fan. All was OK once I re-installed the factory fan.

Sarumatix Veteran

Sarumatix

Posted
Posted

Cooling is a dangerous thing to fiddle with, I have recently converted to thermos and have had few problems however so far (grasps wood with both hands). There is a little power improvement but that vanishes whenever the fans come on (which seems to be never when the car is moving so far). I did it because my stock fan had turned to rubbish. This is on an RB26, leave the stocky unless you need to change it.

rev210 Grand Master

rev210

Posted
Posted

I used the 16 inch davies craig thermo. It is easily as good as the factory fan and fits in the shroud with very little modification.

The key is to retain the fan shroud or make up a new one, otherwise the fans aren't as efficient at drawing air through the radiator.

predator Grand Master

predator

Posted
Posted
I think you'd LOSE a little bit of power if the RB25 pushes more air. =-]

Not necessarily, if the fan blades are more efficient, you can get more airflow with less drag on the pulley system.

but craved is right, I swapped it over onto my rb20 and noticed it gave better cooling... its a slightly better design, like many things on the rb25.

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