Discussion
Stig,
Ive read back through this tread and cant find one important detail...have you pulled out your thermostat and tested it?
If youve added EWP,high flow fans, oil cooler, etc and youve STILL got the same problem the maybe its your thermostat. My guess would be thats is opening too late and more importantly too little.
Is it possible that the thermostat is restriciting your flow rates and hence cooling capacity at low rpm?
Ive heard arguements its because of the s/c but at idle? I wouldnt think so.
After all the effort youve gone to, maybe its time to go back to basics.
Just my $0.02 worth
Andy
Ive read back through this tread and cant find one important detail...have you pulled out your thermostat and tested it?
If youve added EWP,high flow fans, oil cooler, etc and youve STILL got the same problem the maybe its your thermostat. My guess would be thats is opening too late and more importantly too little.
Is it possible that the thermostat is restriciting your flow rates and hence cooling capacity at low rpm?
Ive heard arguements its because of the s/c but at idle? I wouldnt think so.
After all the effort youve gone to, maybe its time to go back to basics.
Just my $0.02 worth
Andy
Stig,
The other thing that may be different with your car is the amount of reflective heat shielding in the engine compartment, which could account for the big different between canopy up and down temps. As I remember, you extended heat shielding to the front of the canopy, as well as having the bulk head shielded. Maybe that little bit extra heat retention is causing problems when the car is static and there is limited air flow in and around the engine. Lagging the exhaust as suggested by Andy might help. Could additional air vents be inserted in the rear clip to let more heat out by convection? Would need to be careful not to affect aerodynamics though.
>> Edited by gdr on Sunday 1st June 12:05
The other thing that may be different with your car is the amount of reflective heat shielding in the engine compartment, which could account for the big different between canopy up and down temps. As I remember, you extended heat shielding to the front of the canopy, as well as having the bulk head shielded. Maybe that little bit extra heat retention is causing problems when the car is static and there is limited air flow in and around the engine. Lagging the exhaust as suggested by Andy might help. Could additional air vents be inserted in the rear clip to let more heat out by convection? Would need to be careful not to affect aerodynamics though.
>> Edited by gdr on Sunday 1st June 12:05
Thanks for the link to the water pump site. After reading the ads it looks like this is the pump to get. It has an available "thermostat" that sounds like an electromic speed controller.
As metioned earlier they recommend that you remove the thermostat and water pump impeller. It sounds like the function of the thermostat is assumed by the controller for the motor(if the coolant is cold the pump slows down).
It flows up to 80 gpm, the highest I've seen. At that flow rate the stock pump may indeed be restricting the flow at idle.
Hopefully you will remove your thermostat and bypass your mechanical pump prior to removing the insulation from the coolant pipes.
As metioned earlier they recommend that you remove the thermostat and water pump impeller. It sounds like the function of the thermostat is assumed by the controller for the motor(if the coolant is cold the pump slows down).
It flows up to 80 gpm, the highest I've seen. At that flow rate the stock pump may indeed be restricting the flow at idle.
Hopefully you will remove your thermostat and bypass your mechanical pump prior to removing the insulation from the coolant pipes.
Stig. The run to Le Mans is going to be the acid test for overheating, particularly the crawl through Rouen if you're going down via the N138. You seem to have investigated all of the logical tweaks to make the engine run cooler but I would go along with Ultimandy's suggestion to wrap the exhaust system (including the silencers) to try and reduce the engine bay temperature as much as possible. Reading your reports, it seems that this factor, more than any other, has the biggest influence on the coolant temperature.
It's a shame to have to cover up that beautiful s/s exhaust system but it might be worthwhile doing as an interim measure at least until you can find a more acceptable solution to the problem.
It's a shame to have to cover up that beautiful s/s exhaust system but it might be worthwhile doing as an interim measure at least until you can find a more acceptable solution to the problem.
did a quick test yesterday.
Blistering heat, just been down the strip and got the water and oil temp nice and high (oil was over 100c).
Sitting waiting for my next run the water temp was climbing towards 90c so I switched on the fans manually.........5mins later it had dropped 2c but the ambient temp in the engine bay had risen and was nearly 50c.
Don't think it would be wise to use Le-mans as an acid test and I suspect CJ is doing this in preparation for the trip.
Even after two hrs of switching my engine off at night with the back left open the rocker covers, block heads etc were still to hot to touch. I would hate to try try to remove the filler cap and risk somthing cracking when cool liquids were added.
Andy
Blistering heat, just been down the strip and got the water and oil temp nice and high (oil was over 100c).
Sitting waiting for my next run the water temp was climbing towards 90c so I switched on the fans manually.........5mins later it had dropped 2c but the ambient temp in the engine bay had risen and was nearly 50c.
Don't think it would be wise to use Le-mans as an acid test and I suspect CJ is doing this in preparation for the trip.
Even after two hrs of switching my engine off at night with the back left open the rocker covers, block heads etc were still to hot to touch. I would hate to try try to remove the filler cap and risk somthing cracking when cool liquids were added.
Andy
Thanks again for all your input.
Am unfortunately away on business for a week, but will be back for the weekend to investigate more options.
Exhaust lagging is one, thermostat testing (may fit a high-flow item), temperature testing etc.etc.
Having experienced overheating problems in the past, it is a sure fire way of destroying your enjoyment of the car.
I have to say though, in all the road miles I have done so far (not a huge amount admittedly) the car has been perfect as far as cooling goes. As some correctly surmised, I am preparing for the potential traffic/high temperatures during the trip to Le Mans.
Still, it's all good fun eh?
Am unfortunately away on business for a week, but will be back for the weekend to investigate more options.
Exhaust lagging is one, thermostat testing (may fit a high-flow item), temperature testing etc.etc.
Having experienced overheating problems in the past, it is a sure fire way of destroying your enjoyment of the car.
I have to say though, in all the road miles I have done so far (not a huge amount admittedly) the car has been perfect as far as cooling goes. As some correctly surmised, I am preparing for the potential traffic/high temperatures during the trip to Le Mans.
Still, it's all good fun eh?
ultiman said: Chris
Can you summarise now what you have done to improve your cooling and how effective it is.
Are you now confident enough to hit Le Mans? Finally are you with the team of 10 setting off from Dover Thursday AM?
Will update you on Monday after some fiddling at the weekend. And yes, I'll be at Dover!
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