[Fot] GT6 cooling

Mon Feb 10 22:20:47 MST 2014

Sorry this if this comes through twice,

Vince, I would not recommend using the stock sized radiator for anything
but the street,
not enough volume for the race car.
The radiator needs to be big.

AND originally to Ed,
First of all, I can tell you that unless you have just won an SCCA National
Championship... 1 or 2 races on a GT6 race motor is not normal by any
preparation standards.
With normal and typical maintance You should be able to get a full season
of racing out of any GT6 race car.
I obviously cannot tell anything  about the internals of your motor build.
Assuming you have reliable motor and in terms of cooling.
Surprise! I agree with Kas.
I has to be huge.
Every successful GT6 racer I have known has gone through a series of making
it bigger and bigger.

Both of the cars I race have always used a large volume and pretty simple
set-up containing the following components:
No fan,
No alternator,
Perfect Shrouding,
Oversized and lengthened hoses,
Some General Flow UPwards (like at least to the valve cover) and REARwards
to main header tank and FILL point.
Then, Another overflow tank beyond that, and mounted in the battery box,

In Terms of filling (sorry I don't have any exact #s on Volume) but,
I Start with a 5 gallon Bucket and a huge funnel,
Stand high and pour from high,
I have heard this is a particularly important part of (especially with the
GT6 race motor)
The water needs the high pressure of a steady 5 gallon pour to get fully
drunk.

I just use water and some Redline water wetter

This set up has proven reliable.
(Photos available on request)

I would Add that typically I would guess I run a bit hotter than Scott,
over 200 for sure if it running right

Jason Ostrowski
Friendly Ghost Racing
Triumph GT6+ racecars.

On Mon, Feb 10, 2014 at 10:34 PM, Vince G <vangoughv at hotmail.com> wrote:

> 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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