Uprated thermostat
Discussion
caduceus said:
Does one exist for the Chimaera? (4.5)
I don't know about the 450, but I have bought an early opening one (74) for my Griff 500 from RaceDirect. Works a treat. caduceus said:
Our engines don't cool particularly well in traffic.
Any ideas?
Cad
You should try it in HK - the 500 detested it initially here!Any ideas?
Cad
I have had the small bladed two-fan system that came with the RaceDirect Aluminium radiator replaced with SPAL fans. Even with AC on and a heat-index ambient temperature of 40+ degrees, the water temperature various between only 88 and 92.
74°C - Hot Climates
82°C - Standard
88°C - Cold Climates/Winter
Personally I think its load of nonsense, I run an 88°C all year round and have been sat in a number of 36 degree Celsius traffic jams in France and my accurate Canems software showed the cooling system consistently cycles between 88-92°C under such conditions.
The purpose of the thermostat is to aid faster warm up and for the engine to reach it's optimum operating temperature s quickly as possible, the ideal but safe operating temperature for this engine being 90°C and controlled 5°C either side of this figure.
The purpose of the remaining components in the cooling system (rad, water pump, rad fans) along with the overall coolant capacity are designed to maintain the target 90°C with the thermostat fully open.
If you need to bring the radiator in early by fitting a 74°C thermostat something is wrong with your cooling system or more likely the readings on your TVR temp gauge. Opening the thermostat early will have no effect on the final maximum operating temperature anyway, at best it will just mean it takes the coolant fraction longer to get to the maximum figure because an engine fitted with 74°C thermostat will still idle at 90°C just the same as one running a 88°C thermostat because both thermostats will be fully open.
What you actually want from a thermostat is one that's fully open at or just before the correct target temperature your engine is designed to operate at and in the case of the Rover V8 that's 90°C so the perfect thermostat is actually an 88°C one. An 88°C will allow your engine to warm up faster, come out of the warm up phase fuelling strategy quicker so save fuel & engine wear and will efficiently maintain the optimum running temperature.
When driving at speed (even on a hot day) the thermostat will be cycling between open & closed, if you fit a 74°C thermostat that will be happening too early and your engine will never get close to the optimum running temp, this is why you are far better fitting a thermostat rated as close as possible to optimum running temperature of 90°C.
Cars don't over heat at speed they overheat when idling in traffic jams, and with both a 74°C & 88°C thermostat being fully open under these conditions the thermostat plays no part in reducing the possibility of overheating.
For all these factual reasons if your TVR overheats you need to look at the other components in your cooling system like the radiator, rad fans and water pump, fitting a 74°C thermostat will do nothing more than have your engine running too cool at speed.
Finally aluminium radiators do not cool better than traditional copper core radiators, they are lighter but the do not cool better, because the core doeds the cooling. To make a radiator more efficient you need to add an additional core the same rule applies in either type of radiator as it increases it's capacity.
Actually when both metals are compared the truth is copper is more thermally efficient than aluminium
82°C - Standard
88°C - Cold Climates/Winter
Personally I think its load of nonsense, I run an 88°C all year round and have been sat in a number of 36 degree Celsius traffic jams in France and my accurate Canems software showed the cooling system consistently cycles between 88-92°C under such conditions.
The purpose of the thermostat is to aid faster warm up and for the engine to reach it's optimum operating temperature s quickly as possible, the ideal but safe operating temperature for this engine being 90°C and controlled 5°C either side of this figure.
The purpose of the remaining components in the cooling system (rad, water pump, rad fans) along with the overall coolant capacity are designed to maintain the target 90°C with the thermostat fully open.
If you need to bring the radiator in early by fitting a 74°C thermostat something is wrong with your cooling system or more likely the readings on your TVR temp gauge. Opening the thermostat early will have no effect on the final maximum operating temperature anyway, at best it will just mean it takes the coolant fraction longer to get to the maximum figure because an engine fitted with 74°C thermostat will still idle at 90°C just the same as one running a 88°C thermostat because both thermostats will be fully open.
What you actually want from a thermostat is one that's fully open at or just before the correct target temperature your engine is designed to operate at and in the case of the Rover V8 that's 90°C so the perfect thermostat is actually an 88°C one. An 88°C will allow your engine to warm up faster, come out of the warm up phase fuelling strategy quicker so save fuel & engine wear and will efficiently maintain the optimum running temperature.
When driving at speed (even on a hot day) the thermostat will be cycling between open & closed, if you fit a 74°C thermostat that will be happening too early and your engine will never get close to the optimum running temp, this is why you are far better fitting a thermostat rated as close as possible to optimum running temperature of 90°C.
Cars don't over heat at speed they overheat when idling in traffic jams, and with both a 74°C & 88°C thermostat being fully open under these conditions the thermostat plays no part in reducing the possibility of overheating.
For all these factual reasons if your TVR overheats you need to look at the other components in your cooling system like the radiator, rad fans and water pump, fitting a 74°C thermostat will do nothing more than have your engine running too cool at speed.
Finally aluminium radiators do not cool better than traditional copper core radiators, they are lighter but the do not cool better, because the core doeds the cooling. To make a radiator more efficient you need to add an additional core the same rule applies in either type of radiator as it increases it's capacity.
Actually when both metals are compared the truth is copper is more thermally efficient than aluminium
Edited by ChimpOnGas on Tuesday 11th October 07:41
ChimpOnGas said:
74°C - Hot Climates
82°C - Standard
88°C - Cold Climates/Winter
Personally I think its load of nonsense, I run an 88°C all year round and have been sat in a number of 36 degree Celsius traffic jams in France and my accurate Canems software showed the cooling system consistently cycles between 88-92°C under such conditions.
The purpose of the thermostat is to aid faster warm up and for the engine to reach it's optimum operating temperature s quickly as possible, the ideal but safe operating temperature for this engine being 90°C and controlled 5°C either side of this figure.
The purpose of the remaining components in the cooling system (rad, water pump, rad fans) along with the overall coolant capacity are designed to maintain the target 90°C with the thermostat fully open.
If you need to bring the radiator in early by fitting a 74°C thermostat something is wrong with your cooling system or more likely the readings on your TVR temp gauge. Opening the thermostat early will have no effect on the final maximum operating temperature anyway, at best it will just mean it takes the coolant fraction longer to get to the maximum figure because an engine fitted with 74°C thermostat will still idle at 90°C just the same as one running a 88°C thermostat because both thermostats will be fully open.
What you actually want from a thermostat is one that's fully open at or just before the correct target temperature your engine is designed to operate at and in the case of the Rover V8 that's 90°C so the perfect thermostat is actually an 88°C one. An 88°C will allow your engine to warm up faster, come out of the warm up phase fuelling strategy quicker so save fuel & engine wear and will efficiently maintain the optimum running temperature.
When driving at speed (even on a hot day) the thermostat will be cycling between open & closed, if you fit a 74°C thermostat that will be happening too early and your engine will never get close to the optimum running temp, this is why you are far better fitting a thermostat rated as close as possible to optimum running temperature of 90°C.
Cars don't over heat at speed they overheat when idling in traffic jams, and with both a 74°C & 88°C thermostat being fully open under these conditions the thermostat plays no part in reducing the possibility of overheating.
For all these factual reasons if your TVR overheats you need to look at the other components in your cooling system like the radiator, rad fans and water pump, fitting a 74°C thermostat will do nothing more than have your engine running too cool at speed.
Finally aluminium radiators do not cool better than traditional copper core radiators, they are lighter but the do not cool better, because the core doeds the cooling. To make a radiator more efficient you need to add an additional core the same rule applies in either type of radiator as it increases it's capacity.
Actually when both metals are compared the truth is copper is more thermally efficient than aluminium
Well said Dave, it was what I was eluding to in my first post, but I couldn't be arsed to type like you do. 82°C - Standard
88°C - Cold Climates/Winter
Personally I think its load of nonsense, I run an 88°C all year round and have been sat in a number of 36 degree Celsius traffic jams in France and my accurate Canems software showed the cooling system consistently cycles between 88-92°C under such conditions.
The purpose of the thermostat is to aid faster warm up and for the engine to reach it's optimum operating temperature s quickly as possible, the ideal but safe operating temperature for this engine being 90°C and controlled 5°C either side of this figure.
The purpose of the remaining components in the cooling system (rad, water pump, rad fans) along with the overall coolant capacity are designed to maintain the target 90°C with the thermostat fully open.
If you need to bring the radiator in early by fitting a 74°C thermostat something is wrong with your cooling system or more likely the readings on your TVR temp gauge. Opening the thermostat early will have no effect on the final maximum operating temperature anyway, at best it will just mean it takes the coolant fraction longer to get to the maximum figure because an engine fitted with 74°C thermostat will still idle at 90°C just the same as one running a 88°C thermostat because both thermostats will be fully open.
What you actually want from a thermostat is one that's fully open at or just before the correct target temperature your engine is designed to operate at and in the case of the Rover V8 that's 90°C so the perfect thermostat is actually an 88°C one. An 88°C will allow your engine to warm up faster, come out of the warm up phase fuelling strategy quicker so save fuel & engine wear and will efficiently maintain the optimum running temperature.
When driving at speed (even on a hot day) the thermostat will be cycling between open & closed, if you fit a 74°C thermostat that will be happening too early and your engine will never get close to the optimum running temp, this is why you are far better fitting a thermostat rated as close as possible to optimum running temperature of 90°C.
Cars don't over heat at speed they overheat when idling in traffic jams, and with both a 74°C & 88°C thermostat being fully open under these conditions the thermostat plays no part in reducing the possibility of overheating.
For all these factual reasons if your TVR overheats you need to look at the other components in your cooling system like the radiator, rad fans and water pump, fitting a 74°C thermostat will do nothing more than have your engine running too cool at speed.
Finally aluminium radiators do not cool better than traditional copper core radiators, they are lighter but the do not cool better, because the core doeds the cooling. To make a radiator more efficient you need to add an additional core the same rule applies in either type of radiator as it increases it's capacity.
Actually when both metals are compared the truth is copper is more thermally efficient than aluminium
Edited by ChimpOnGas on Tuesday 11th October 07:41
I used to change my stat in the winter for an 88 and a 74 in summer because the temps would creep up in the summer (after a blast then getting stuck in traffic or just driving around the city ) with an 88 fitted a deeper cored rad, three fans in a push up setup. If you can get the water flowing rather that cycling you do stand a better chance of not pushing it over the edge
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