Ron,
One of the problems with the stock shroud is that it is way off center no
doubt due to the fact that the fan is off centered and so when I center my
electric fan the shroud gets in the way. Oh well.
The Scirocco rad seems to be the rad to use in a variety of cars but the
problem w/the roadster is the limited width. I was given a 240 rad and
someone else gave me a used Scirocco rad but I had no luck trying to mount
them as there is too much in the way and they are way too wide.
How do flex fans work out? Anybody try using them?
Mike
----- Original Message -----
From: "Ronnie Day" <ronday@home.com>
To: "datsunmike" <datsunmike@nyc.rr.com>; "Datsun Roadster List"
<datsun-roadsters@autox.team.net>
Sent: Wednesday, April 25, 2001 12:39 PM
Subject: Re: Cooling
> >However now that I stroked/bored the engine do you think the cooling
system
> >will be taxed even more? I had it recored with a core that has many more
> >fins per inch than my old radiator but both are the same number of rows.
> >
> >I also have a stock 7 plastic bladed fan that I can use or I can buy a
> >Flex-a-lite fan.
>
> An increase in engine size is going to increase the load on the cooling
> system in any case. The key to making a fan work is a good shroud so that
> the fan pulls air through the entire surface of the radiator, not just
> the area directly in front of the fan itself. The fan need to be centered
> on the shroud opening and allow just enough clearance so the fan doesn't
> hit the shroud when the engine torques over. With electric fans you don't
> have to deal with engine movement, but you still need a good shroud for
> maximum cooling efficiency. I don't remember if the roadsters have a
> shroud, but they probably should. It would take some work, but I'd think
> fabricating a workable home built version shouldn't be too difficult, and
> would yield measurable benefits.
>
> If the OEM radiator still falls short, a popular radiator swap for the
> 510, as well as being used in a lot of other modified cars, is the
> Scirocco (VW) unit. It's so popular that there are a number of versions
> available up to a very heavy duty all aluminum unit from Griffin. To
> compliment the design, you can get a dual electric fan/shroud combo that
> completely covers the back (engine) side of the radiator. This is the
> setup I plan to run in the 510s from now on, provided there's enough room
> between the Scirocco radiator and the water pump pulley for the fan
> assembly. Some that have used this radiator use one or two smaller fans
> offset to avoid the pulley. Most of the time this radiator has enough
> cooling capacity to work well without a shroud. In case anyone wants more
> info, Jegs and Summitt both sell an aluminum/ABS version for $110, the
> fan setup is around $180. The Griffin unit is $200 plus, but should
> handle just about any motor at any power level.
>
> In any case the fan is really only needed when a car's not moving at all
> or in slow or stop and go traffic.
>
> FWIW, Ron
>
> Ronnie Day
> ronday@home.com
> Dallas/Ft. Worth
> '71 510 2-dr (Prepared Class Autocrosser)
> '73 510 2-dr (Street Toy)
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