Andrew,
The fan is not fixed directly to the pulley, there is a 'clutch-pack' in-between.
The clutch pack is a viscous, mechanical device that disengages at high engine RPM.
It prevents the fan from spinning faster than 2500RPM.
This saves engine power and doesn't really affect the cooling capacity of the car.
(A clutch pack failure causes the fan to lock to the pulley and behave as a normal
engine fan.)
Those baby BMW's 316, 318 etc... still use this type of fan.
Nick
1978 Datsun Stanza
============================================================
From: "Andrew Greenbury" <[EMAIL PROTECTED]>
Date: Thu, 29 Mar 2001 12:11:42 +1000
To: [EMAIL PROTECTED]
Subject: Re: water pump questions
hi nick
sorry i am unfamiliar with this water pump from an auto L20 - so
you are saying its attachment to the rad fan is not fixed but through
a (controllable?) clutch, eliminating the need for (independant)
thermofans??
thanks
andrew
> List,
>
> I used an automatic L20 pump in my engine. Only because it had a viscous clutch fan
>hanging off the front and I couldn't fit an electric fan in.
>
> The automatic T/M water pump has cast, curved vanes as opposed to the four, cheap,
>folded vanes on the normal pump.
>
> I can vouch for the pumping efficiency of this pump, it can collapse the intake pipe
>because the suction is so high.
>
> I ended up keeping the stock L16 radiator because of the increased pumping power.
>
> Will this pump exhibit cavitation at high revs (<7000rpm)?
>
> Nick
> 1978 Datsun Stanza
> ============================================================
> From: "Errol Smith" <[EMAIL PROTECTED]>
> Date: Wed, 28 Mar 2001 20:11:25 +1000
> To: <[EMAIL PROTECTED]>
> Subject: RE: water pump questions
>
> Steve,
> L20B and 240K pumps have different impeller depths as well. The deeper
> impellers are ok for low engine speed running in hot weather but cavitate a
> lot at high engine speeds.
> Cheers
> Feral Errol
> mailto:[EMAIL PROTECTED]
> <a href="<a
>href="http://www.datrats.com.au/">http://www.datrats.com.au/</a>">http://www.datrats.com.au/">http://www.datrats.com.au/</a></a>
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of steven harney
> Sent: Wednesday, March 28, 2001 6:33 PM
> To: [EMAIL PROTECTED]
> Subject: RE: water pump questions
>
>
> They probaly bolt on although there are some differences. ie the z series
> has a deeper cut, you can spot the differece if you sit them side by side. I
> don't know if this will affect the performance of the pump. I ended up using
> a z20 pump, although harder to find second hand they are similar in price.
>
> my 2 cents
> Steve.
>
>
>
>
>
> Chris,
> Just a stock L18/L20 pump will do.
>
> Cheers
> Feral Errol
> mailto:[EMAIL PROTECTED]
> <a href="<a
>href="http://www.datrats.com.au/">http://www.datrats.com.au/</a>">http://www.datrats.com.au/">http://www.datrats.com.au/</a></a>
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of FJ MAN
> Sent: Monday, March 26, 2001 12:43 AM
> To: [EMAIL PROTECTED]
> Subject: water pump questions
>
>
>
> ive taken the clutch fan assembly off my z18et for clearance and appearance
> reason so now i need a new water pump is there any specific type ppl go for
> or should i just get the L20 replacement?
> cheers fellas
> regards chris
> _________________________________________________________________________
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