Discussion
took the car the "long way round" home last night, mixture of A roads and motorway.
Was stuck in traffic for about 15 minutes and the temperature started to increase. Considering it really wasn't that hot outside, approx 7 degrees and the fact I have a much bigger radiator now with both fans kicking in together any suggestions why it might be getting so hot.
Also as the temporature increased the oil pressure started to drop from the normal 48ish to low 40's and sometime slightly below.
I also think the expansion bottle saw some action as there were a few small puffs of steam from there. All seemed to settle down once on the motorway again but it was running hot. Typically it over the past fe months it has been running about 85-90ish.
Any help greatly appreciated.
Was stuck in traffic for about 15 minutes and the temperature started to increase. Considering it really wasn't that hot outside, approx 7 degrees and the fact I have a much bigger radiator now with both fans kicking in together any suggestions why it might be getting so hot.
Also as the temporature increased the oil pressure started to drop from the normal 48ish to low 40's and sometime slightly below.
I also think the expansion bottle saw some action as there were a few small puffs of steam from there. All seemed to settle down once on the motorway again but it was running hot. Typically it over the past fe months it has been running about 85-90ish.
Any help greatly appreciated.
Three questions, because it doesn't really matter how big your radiator is for your particular problem.
Let your car idle stationary and let us know what temperature your car levels out at. Obviously if this is above 105 stop the test.
When do the fans come on
When the fans come on how fast and where does the temperature come down to until the fans cut out.
Let your car idle stationary and let us know what temperature your car levels out at. Obviously if this is above 105 stop the test.
When do the fans come on
When the fans come on how fast and where does the temperature come down to until the fans cut out.
fans normally come in about 95, which is the same as the normal idling temp.
It is going to Austec on saturday anyway to get properly set up after the engine rebuild so maybe they will be able to sort the fans coming in earlier and also an indication of why its running hot.
The temp normally takes about 10-20 seconds to come back down. I stopped in a local car park after a motorway session yesterday and with bonnet open checked the fans were running and they were!
The concerning part for me was the falling oil pressure as the temp climbed up to 100 and according to the needle beyond!
>> Edited by xsnowman on Wednesday 15th February 13:37
It is going to Austec on saturday anyway to get properly set up after the engine rebuild so maybe they will be able to sort the fans coming in earlier and also an indication of why its running hot.
The temp normally takes about 10-20 seconds to come back down. I stopped in a local car park after a motorway session yesterday and with bonnet open checked the fans were running and they were!
The concerning part for me was the falling oil pressure as the temp climbed up to 100 and according to the needle beyond!
>> Edited by xsnowman on Wednesday 15th February 13:37
xsnowman said:
fans normally come in about 95, which is the same as the normal idling temp.
It is going to Austec on saturday anyway to get properly set up after the engine rebuild so maybe they will be able to sort the fans coming in earlier and also an indication of why its running hot.
The temp normally takes about 10-20 seconds to come back down. I stopped in a local car park after a motorway session yesterday and with bonnet open checked the fans were running and they were!
The concerning part for me was the falling oil pressure as the temp climbed up to 100 and according to the needle beyond!
>> Edited by xsnowman on Wednesday 15th February 13:37
Well your answers are pretty reassuring. You didn't say how far the temp came down, or how far it goes up on standing idle.
So far we can surmise that if your fans come on at 95 your temp gauge is fairly accurate.
We can also say that if your fans only have to be on for twenty seconds to make the temp come back down you have one mighty big efficient radiator sitting in the front of your car.
We can also quiery why two piddly fans on your radiator seem to manage more in the way of cooling than running down the motorway which should be sticking far more air through across your radiator than the fans ever could.
Its very unlikely to be the temperature sensor.
For it to be the temperature sensor the sensor would have to be misreading or inaccurate.
It your fans come on at 95 as indicated by your dashboard dial it means you have two independant temperature measurments both agreeing with each other, for that is the temp at which the fan is meant to come on.
That pretty much reassures me that the temperature sensor is working okay.
For it to be the temperature sensor the sensor would have to be misreading or inaccurate.
It your fans come on at 95 as indicated by your dashboard dial it means you have two independant temperature measurments both agreeing with each other, for that is the temp at which the fan is meant to come on.
That pretty much reassures me that the temperature sensor is working okay.
I agree with julian64 .. at the moment it looks like you have no temp gauge/sender probs unless they both coincidently happen to be misreading.. after all it is a TVR lol but I'd be 99% sure all was ok ..
in which case I'd just get the oil pressure spring changed and also the expansion tank cap, rebleed any air out (using water wetter to chase out air leaks is always a good idea on cerbs too) and see how you go from there.
in which case I'd just get the oil pressure spring changed and also the expansion tank cap, rebleed any air out (using water wetter to chase out air leaks is always a good idea on cerbs too) and see how you go from there.
TVRWhoa said:
Joolz you mention using water wetter to chase out air leaks - could someone explain to me how this happens
An engine is cooled by heat from the metal of the engine being transfered to the water, then the water is cooled by the radiator.
Now imagine a glass of champagne with all those bubbles on the glass, the same thing happens in an engine, and those bubbles will prevent the heat transferring from the metal to the water. 'Water wetter' lowers the surface tension of the water, and so prevents the formation of bubbles, and so increases - in effect - the surface area of the metal and so in turn gives greater heat transfer and this better cooling.
Edited by jensena on Sunday 6th August 23:36
I think the water pumps on cerbs aint up to the job
I find when standing in traffic ticking over the temp rises to scary levels the fans come on and i sit there waiting for the temp to come down
it does'nt
when i rev it a little (spinning the water pump faster) the temp comes down
might just be my car but given that there are so many posts on high temp cerbs, try it
I find when standing in traffic ticking over the temp rises to scary levels the fans come on and i sit there waiting for the temp to come down
it does'nt
when i rev it a little (spinning the water pump faster) the temp comes down
might just be my car but given that there are so many posts on high temp cerbs, try it
Edited by betty_swallocks on Monday 7th August 07:33
I have noticed this too, but you got to be carefull not to rev it too high or you'll start to generate extra under bonnet heat.
Something I also found works well when stuck in slow moving traffic, is, to try and let a bit of a gap open up in front of you, then give the car a quick blast up to the car in front. This will help to expell alot of the heat trapped under the bonnet and will also spin up the water pump.
Cools the car down a treet, but watch for the muppet who will always try and fill the gap you just made.
Something I also found works well when stuck in slow moving traffic, is, to try and let a bit of a gap open up in front of you, then give the car a quick blast up to the car in front. This will help to expell alot of the heat trapped under the bonnet and will also spin up the water pump.
Cools the car down a treet, but watch for the muppet who will always try and fill the gap you just made.
what temp did the car get to ?
Today was pretty hot day - I went for a drive with mixed traffic and road types. Have got the trackcar cooling chip mod and wetter water. My car didnt get above an indicated 102. Generally was around 95 I guess. When I checked the ecu the gauge over reads by 8 degs. So I am reasonably happy with the temps. But if I ever get any major engien work done I Will probably get an alloy rad fitted to give it even more help.
Today was pretty hot day - I went for a drive with mixed traffic and road types. Have got the trackcar cooling chip mod and wetter water. My car didnt get above an indicated 102. Generally was around 95 I guess. When I checked the ecu the gauge over reads by 8 degs. So I am reasonably happy with the temps. But if I ever get any major engien work done I Will probably get an alloy rad fitted to give it even more help.
Today mine was running at times up to 105 whilst driving at quite a spirited pace through country lanes, and approx 100 on the M.way. But I do have a small leak in my rad, which doesn't help.
But doing my little trick can, depending on outside air temp, bring the cars temp down about 10 deg's or so.
But doing my little trick can, depending on outside air temp, bring the cars temp down about 10 deg's or so.
I had something similar a while back (although I didn't notice anything with the oil pressure?). Anyway, turned out to be a very slight coolant leak at a jublee clip (so slight I never noticed any puddles of water or drop in coolant level). Tightening the clip didn't stop the leak, but changing the clip did. Basically, the cooling system wasn't pressurised as it should be causing poor flow rates through the Rad and hence the water temp to rise higher than normal. On one long journey she actually blew a lot of coolant out of the expansion tank where she got too hot - at least I know the expansion tank cap is ok! Luckily I had just got to Fernhurst and they sorted it out, free of charge I might add (Cheers guys 
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