[Fot] GT6 cooling

[Vince G]

I agree with the "some other problem theory".  I put a brand new core in a
stock rad, added an aluminum shroud and my temp stays 180 to 190 when in track
in 80 degree weather.  My engine is pretty mild though.  My street GT6 is the
same.   On a real hot day in stop and go traffic it runs hotter, on the
highway it's good.   I need to put electric fans on both cars...

I use the water wetter" additive in both vehicles.

Good luck Ed..

Sent from my iPhone

On 2014-02-10, at 10:14 PM, "Scott Janzen" <sjanzen at me.com> wrote:

> Honestly, I think there could be another problem besides radiator size,
though
> I don't really know the capacity of those Scirocco rads.
> You can find photos of my car and the radiator and fan on
BritishRaceCar.com.
> Just type in GT6 once you get there.  A bunch of FOT cars are on this site.
> When I got the car it had what I was told was an old Corvette radiator,
> cross-flow, wide and not very tall, leaky and weighted a ton but basically
> mimicking horizontal shape of the the grille opening.  I replaced it with
an
> aluminum one of the same dimensions I had someone make up, and added a good
> shroud.  Frankly, it is too much cooling.  I run a small orifice in place
of
> the thermostat, and int the hottest days of summer it stays at 190 when on
the
> track, and in cooler weather I have to block off part of the radiator with
> cardboard to keep the temp up above 160.
> The fan is typically only running when in the paddock after a track session
or
> if we are on the grid for too long, but then I just shut it down.
> I've slowed the pump down with pulley size as much as I can - at 6-7000 RPM
I
> suspect there's still too much flow.  I've heard of people trimming the
> impeller on a lathe.
>
> Check to make sure you don't have an air lock or blockage somewhere and have
a
> good radiator shop look at the radiator, and check the thermostat in a pan
of
> water on the stove.  The only temps that matter are when you are running on
> track - agreed that temps other times will be a problem without a fan.
>
>
> On Feb 10, 2014, at 9:24 PM, Edward Dunn wrote:
>
> Jason, et al;
>
> I've tried without a great deal of  success to race a '71 GT6.  Currently
> getting about 1.2 races per engine.  Getting a bit too expensive for me,
> compared to my Spitfire which is pretty solid.
>
> I won't begin to compare with my wife's vintage Formula V, which just runs
> and
> runs (on pump gas...) and for which a race engine rebuild costs a whopping
> $1600...
>
> It appears now that the current issue is cooling.  Running a plastic VW
> radiator, stock water pump.  What pulleys are working for you GT6 folks,
and
> what other things can you suggest to keep temp under control?
>
> Right now, it's got a fresh, relatively mild zero-hour engine, cam, stock
> carbs, external oil octopus, Accusump.
>
> I am perplexed...
>
>
> Ed Dunn
> Penngrove CA
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