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wow! hope you haven't dropped anything in the plug hole while plug was out. However like th epost above you'd have to shave alot off the head for it to be hitting the pistons. GL hame

found it after some isolation of parts. Turned out being the clutch fan bearing had siezed up and it was clicking round. I took the clutch fan off and ran the motor and its perfect. couldnt believe it. The fan was rooted, i've bought a 12in thermo fan to run instead.

Thanks for all the replies guys.

if an RB engine didn't need a viscous fan, don't you think the factory would have just used an electric one?

probly because viscous fans are cheaper, on the holden V8's you ditch the viscous fan and run ford thermos when ya get the motor pumpin n jumpin

Definitely is..

As I said before I ran 2x12" thermo's; they were mounted directly on to the rad. Upon pulling them off it was scary to see how little of the radiator air was being pulled through. Dust marks left behind looked to be ~25-30% of the radiator.

Shroud or not a single 12" won't pull enough cfm to cool sitting in traffic on a 35+degree day with the a/c on. With the a/c off you may get away with it as the viscous pulls bugger all air on idle. Mine tends to slowly increase engine temps until around 92-95degree's then holds steady when idling in peak hour with the viscous and a/c on.

I run a Ford twin shrouded thermo on an ally radiator and you can feel at the back of the car when it pulls on, and pushing through the ranges it sits perfect on 84deg and 83 at idle. Without the fan traffic driving pushes temps to 102, just for info' sake.

So who wants to debate that they don't work when properly researched and fitted?

Sure you are going to waste your money with a simple gutless unshrouded design, but for $200 from Autobarn you can have a decent setup.

And given that the last 2 viscous fans on the race car started to self destruct I'd be inclined to go with thermos.

Standard thermostat, but using an insert 90 on 80 off temp switch.

Using the Au fans, so with a 45mm ally (50mm tanks) it has 4mm clearance to the radiator and 4 mm to the PS pulley but cannot hit either short of a catastrophic impact.

Yep, had to really work slow to get the fit perfect but worth it in the end. I've never had trouble with thermos but bloody viscous fans are nothing but dramas on the track.

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