[Fot] TR8 Water temperature

Wed Jul 13 07:36:45 MDT 2016

Building the oil cooler into the radiator is a great way to go except you have to change both if you have an engine failure that contaminates the oil. Absent this small issue, using hot water to warm cold oil is useful. My old Maserati Mistral has a ridiculously complicated water/oil heat exchanger to do just that. It has three thermostats—one that connects the heat exchanger to the engine outlet to warm the oil from the water (which gets hot first) and then to switch to the radiator outlet to cool the oil. If you’re going to have a radiator made, make it a two pass for the water section. No significant change in size (just a little thicker) and about 40-50% more temperature drop at the same flow rate. 

> On Jul 12, 2016, at 10:43 AM, MadMarx <tr4racing at googlemail.com> wrote:
> 
> Hi Ken,
>  
> the opening of the nose is not very big.
> The oil cooler sits on the top of the opening and leaves half the space for the water radiator. I have opened little slots to create more air.
> Some of the air is going under the car some is coming out between bonnet and windshield.
> They had removed a lot of metal to make a big side to side slot to vent the engine.
> My guess is that air should be enough.
> Assuming that air is enough, radiator is sufficient, then it should be something else that disturbs.
> Maybe water flow, pump speed….I’ll test.
>  
> Thanks
> Chris
>  
> Von: Kenneth Knight [mailto:kknight at klaenv.com <mailto:kknight at klaenv.com>] 
> Gesendet: Dienstag, 12. Juli 2016 16:04
> An: 'MadMarx'
> Betreff: RE: [Fot] TR8 Water temperature
>  
> Chris:
>  
> That should be a big enough radiator but here are some thoughts.  I think the oil cooler may be blocking or disturbing the flow, is it possible to relocate it to the side or lower?  The advice that I got from Griffin Radiator (they made my radiator) was to use a puller fan as it blocks less flow, so if you can I would move the fan to the back if there is room.  The NASCAR guys build their oil coolers into the radiator and that is what I did, it is in the drivers side tank.  It makes for better air flow and on cool to cold days it warms the oil much quicker.
>  
> One thing I can’t tell is where all the flow under the hood exits?  Is it going out under the car or are there cutouts in the hood, possible side vents?  This is something to consider, as the speed you can make likely means a ton of air going into the engine bay, it has to exit somewhere.  You could have a situation where there is no air flow through the radiator at high speed.
>  
> Hope this helps.  Cool car, good luck and keep me posted.
>  
> Ken
>  
> From: MadMarx [mailto:tr4racing at googlemail.com <mailto:tr4racing at googlemail.com>] 
> Sent: Monday, July 11, 2016 1:06 PM
> To: 'Kenneth Knight'
> Subject: AW: [Fot] TR8 Water temperature
>  
> Hi Keneth,
>  
> have a look on the duct:
> <image001.jpg>
>  
> Sheet metal is forcing the air through the radiator. The oil radiator is a little bigger now.
> The oil gets up to 280F which it had at RA also.
> So it haven’t changed to the past when the car was used in Canada but I still think it is too hot.
>  
> Cheers
> Chris
>  
> Von: Kenneth Knight [mailto:kknight at klaenv.com <mailto:kknight at klaenv.com>] 
> Gesendet: Montag, 11. Juli 2016 16:14
> An: 'MadMarx'
> Betreff: RE: [Fot] TR8 Water temperature
>  
> Chris:
>  
> Has it always run hot?  If not you may have a pressure leak somewhere.  My alum radiator (50x50cm x 8cm) developed a very small leak but it would only happen when the thing got up to temp.  It was very hard to find.  You might also try changing caps.  If it is not in the cooling system I would look at the ducting and airflow out from engine compartment.  It could be a simple situation of to much air getting in and not enough getting out at high speed to maintain flow.
>  
> That said, 212 f does not seem excessive as long it is not boiling over.  How does your oil pressure and oil tempartures look when this happens.
>  
> Goog luck, Ken
>  
> From: MadMarx [mailto:tr4racing at googlemail.com <mailto:tr4racing at googlemail.com>] 
> Sent: Thursday, July 07, 2016 10:21 AM
> To: 'FOT List'
> Subject: [Fot] TR8 Water temperature
>  
> Hi guys,
>  
> My TR8 is running way too hot about 212F at full speed and at idle the temps are getting that high also. I have no idea to get them down.
> Radiator core is 68x48cm x 5 cm. I suppose that should be enough. I've experiment with different restrictor plates with no change. Changing pump speed didn't help either. The difference between radiator in and outlet is 10°C (50F). Not enough I would say. Maybe making the pump more slower? It was running on a ratio of 0.8 slower than crank, currently 1:1 speed. Any ideas? 10 Liters are circulating.
>  
> Cheers
> Chris
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