Would you run your XJS V12 without an Oil Cooler?
#21
09-23-2016, 08:15 AM
Veteran Member
I've used an infra red gun on the boat and it depends on how far away you are from what you are measuring and whether you are bouncing off metal or rubber. They are good as a guide but only measure the temperature of the outside of the component, not the liquid inside.
I've ordered one of these -50~110°C DC 12V Car Vehicle LED Digital Thermometer Temperature Meter Probe | eBay for the boat and will install the probe inside one of the coolant hoses to get the coolant temperature; I had a similar thing donkeys years ago with a Kenlowe fan on the MGC.
I've ordered one of these -50~110°C DC 12V Car Vehicle LED Digital Thermometer Temperature Meter Probe | eBay for the boat and will install the probe inside one of the coolant hoses to get the coolant temperature; I had a similar thing donkeys years ago with a Kenlowe fan on the MGC.
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orangeblossom (09-23-2016)
#22
09-23-2016, 09:11 AM
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orangeblossom (09-23-2016)
#23
09-23-2016, 05:35 PM
most V12 engines overheat because of overheated oil caused by cooling system problems!
most people after much cooling probs are taken care of , are satisfied,wrong!
but reading TWR race cars they finally(using all new components) still had some heat troubles, they finally went to 2 large oil coolers,(and some oil sump mods), before they could keep the engines cool!
most people after much cooling probs are taken care of , are satisfied,wrong!
but reading TWR race cars they finally(using all new components) still had some heat troubles, they finally went to 2 large oil coolers,(and some oil sump mods), before they could keep the engines cool!
Cheers that was very interesting, so may decide to fit a new Oil Cooler, after I've managed to get her through the MOT Test.
#24
09-23-2016, 05:37 PM
Doug, OB,
With the oil cooler (bypass system) working properly, even in 35C ambient temps, oil temps in my car never exceeded 85C even when driven fast road. The temp drop across the cooler was 20C. The oil temps were measured as maximums all over the engine (oil filter, cooler in and out, sump, cam feed).
The easiest way to do it is temperature strips, which just stick to any cleaned surface wherever you like. Based on these measurements, my view is that in normal UK ambient temps, a cooler is probably not needed for sedate driving.
OB, as you have got your cooler bypassed, why not treat yourself to some Racetech oil temp strips Range B (71 to 110 C range) and put one on the filter and one on the sump and let us know what they read as you use the car. My betting is that the oil temps stay well below 90C in UK autumn weather.
Greg
With the oil cooler (bypass system) working properly, even in 35C ambient temps, oil temps in my car never exceeded 85C even when driven fast road. The temp drop across the cooler was 20C. The oil temps were measured as maximums all over the engine (oil filter, cooler in and out, sump, cam feed).
The easiest way to do it is temperature strips, which just stick to any cleaned surface wherever you like. Based on these measurements, my view is that in normal UK ambient temps, a cooler is probably not needed for sedate driving.
OB, as you have got your cooler bypassed, why not treat yourself to some Racetech oil temp strips Range B (71 to 110 C range) and put one on the filter and one on the sump and let us know what they read as you use the car. My betting is that the oil temps stay well below 90C in UK autumn weather.
Greg
Thanks, that sounds a good idea.
#25
09-23-2016, 05:42 PM
While I'm not concerned with Originality I would like to fit a New Oil Cooler but first I need to sort out the Calipers and then get her through the MOT Test.
#26
09-27-2016, 10:44 PM
Veteran Member
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orangeblossom (09-28-2016)
#27
09-27-2016, 11:50 PM
Veteran Member
As a general rule of thumb, the oil removes about 1/3 of the engines waste heat, so a cooler is a good idea. Doug is right, the ideal temperature range is above 170F and max about 220F. That is to boil off any water that collects ( and water is a byproduct of combustion, so a fair bit of it will find it's way into the crankcase), and not too hot or the oil starts to break down.
Sometimes "cooler" is a misnomer, as there can be heat exchangers between the oil and coolant, and the purpose is to heat the oil to get it into that temperature range faster by taking heat from the coolant. The transmission cooler in the radiator tank does just that.
However, as Greg said, in the UK in autumn you're probably fine without one. Just make sure your radiator and the rest of the cooling system is is perfect shape. In particular it's worth checking the front of the radiator between the radiator and AC condenser, as that is notorious for collecting leaves and debris that block off the airflow.
Sometimes "cooler" is a misnomer, as there can be heat exchangers between the oil and coolant, and the purpose is to heat the oil to get it into that temperature range faster by taking heat from the coolant. The transmission cooler in the radiator tank does just that.
However, as Greg said, in the UK in autumn you're probably fine without one. Just make sure your radiator and the rest of the cooling system is is perfect shape. In particular it's worth checking the front of the radiator between the radiator and AC condenser, as that is notorious for collecting leaves and debris that block off the airflow.
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orangeblossom (09-28-2016)
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