High water temperature issue

[cantfind1]

Think you guys should try one of these, those lower temp ones are useless they don t provide any more flow just open earlier, I have one of these modified ones in my car and can honestly say it works! Plus no engine light!

http://www.ca-automotive.co.uk/singl...pZD0xNjcz.html

[cantfind1]

Shimmy, its prob your rad blocked internally, it happens, I know you have alrady replaced all the other bits of the cooling system.

You could always go for one of these.

http://www.ca-automotive.co.uk/singl...faWQ9MTM2.html

It s what I will be sticking in mine when it needs replacing.

[shimmy]

Originally Posted by cantfind1

Think you guys should try one of these, those lower temp ones are useless they don t provide any more flow just open earlier, I have one of these modified ones in my car and can honestly say it works! Plus no engine light!

http://www.ca-automotive.co.uk/singl...pZD0xNjcz.html

I almost nicked it today!

[cantfind1]

Haha, oh well in that case you don t need to buy one just go and take yours out and take a look at mine and modify yours the same way. Basically cut the slit and snip the spring, not too much though get it exactly like mine.

If mine s missing I will find you!!

[shimmy]

Originally Posted by cantfind1

If mine s missing I will find you!!

finding me will be easy, getting it back may not be

[The Gorilla]

Hi,

The S54 water pump, pumps at a
given flow rate.

The amount of water flow will be dictated by
the smallest restriction in any given flow path.

The Thermostat when open is not the smallest
restriction in the flow path.

The Thermostat housing is prior to the
crossflow water ways that cool the head
and the block on the flow path.

All the CA Stat can do is increase the volume of flow
from the Thermostat location to the cylinder head,
about 150mm, where the water will then again flow at
the same rate as any thermostat.

The flow rate can only be altered by increasing the
flow rate of the water pump which the CA Stat does
and can not do.

The 55 degree Stat was designed so that the stat does not
fluctuate in opening where the ambient air temp at say 70
mph is 60 degrees and the static air temp is say 85+.
Even brief stat closeuers can cause differring expansion
rates bewteen the S54 Alloy head and steel block, whereby
a more steady rise and fall in heat sink temps is preferred.

Regards,

The Gorilla.

[cantfind1]

Originally Posted by The Gorilla

Hi,

The S54 water pump, pumps at a
given flow rate.

The amount of water flow will be dictated by
the smallest restriction in any given flow path.

The Thermostat when open is not the smallest
restriction in the flow path.

The Thermostat housing is prior to the
crossflow water ways that cool the head
and the block on the flow path.

All the CA Stat can do is increase the volume of flow
from the Thermostat location to the cylinder head,
about 150mm, where the water will then again flow at
the same rate as any thermostat.

The flow rate can only be altered by increasing the
flow rate of the water pump which the CA Stat does
and can not do.

The 55 degree Stat was designed so that the stat does not
fluctuate in opening where the ambient air temp at say 70
mph is 60 degrees and the static air temp is say 85+.
Even brief stat closeuers can cause differring expansion
rates bewteen the S54 Alloy head and steel block, whereby
a more steady rise and fall in heat sink temps is preferred.

Regards,

The Gorilla.

That´s all very well and good mate, but the modified thermostat works, its a proven product. Theory sometimes doesn´t work in practice.

[The Gorilla]

Hi,

Cantfind1,

I always want to learn.

So please explain how if
a water pumps flow rate is 'x'
how the water flow is increased
without the smallest restriction
in the flow path being increased
and the pumps volume being increased ?

The CA Stat can no more increase
the water flow than any other stat.

Its not theory either I'm afraid.

Regards,

The Gorilla.

[shimmy]

I'm missing something here

if the stat opens it increases flow, that is what it is there for

if the CA stat let's water pass when stat closed surely that is increasing flow prior to the stat opening as a minimum unless the pump somehow changes flow when stat triggered.

Surley the stat must be the most restrictive part of the system otherwise it does no good at all and has no affect when opened.

[shane@mbtech]

Originally Posted by shimmy

I'm missing something here

if the stat opens it increases flow, that is what it is there for

if the CA stat let's water pass when stat closed surely that is increasing flow prior to the stat opening as a minimum unless the pump somehow changes flow when stat triggered.

Surley the stat must be the most restrictive part of the system otherwise it does no good at all and has no affect when opened.

The gorilla is saying that thermostat is not the smallest part in the loop so by removing it, it will not increase flow so to speak.


The CA stat in my eyes will just make the engine run slightly cooler, much the same as the 55* stat does, different ways but much the same outcome.
The CA stat is open all the time slightly, making it run cooler, whereas the 55* stat opens earlier in order to let it run cooler.
Except in my view the CA stat cannot maintain a constant temp like either the standard stat or the 55*stat does.
I personally would opt for the 55* stat as I think it would be safest.


The function of the stat is

1. To bring the engine up to optimum operating temperature as quickly as possible and
2. To maintain the engine at optimum operating temperature thereafter.


An internal combustion engine operates best at high temperature, with the coolant in the cooling system typically above 80°C - 85 °C (176°F - 185 °F). Wear on the moving parts is reduced and thermal efficiency is increased. Lower temperatures result in increased fuel consumption and reduced engine life. Higher temperatures result in overheating with the danger of premature combustion of the fuel air mixture, also know as detonation or knocking, and damage to engine components.

To ensure that the engine reaches optimum operating temperature as quickly as possible, the thermostat restricts the flow of water from the engine to the radiator to virtually zero (a small flow is required so that the thermostat experiences changes to the water temperature as the engine warms up) until the engine reaches optimum temperature. The thermostat then opens up to allow coolant to flow through the radiator to prevent the temperature rising higher.

Once at optimum temperature, the thermostat controls the flow of coolant to the radiator so that the engine continues to operate at optimum temperature. Under peak load conditions, such as labouring slowly up a steep hill whilst heavily laden on a hot day, the thermostat will be approaching fully open because the engine will be producing near to maximum power while the velocity of air flow across the radiator is low. (The velocity of air flow across the radiator has a major effect on its ability to dissipate heat.) Conversely, when cruising fast downhill on a motorway on a cold night on a light throttle, the thermostat will be nearly closed because the engine is producing little power, and the radiator is able to dissipate much more heat than then engine is producing. Allowing too much flow of coolant to the radiator would result in the engine being over cooled and operating at lower than optimum temperature. A side effect of this would be that the passenger compartment heater would not be able to put out enough heat to keep the passengers warm.

The thermostat is therefore constantly moving throughout its range, responding to changes in vehicle operating load, speed and external temperature, to keep the engine at its optimum operating temperature.