I'm curious to see what others have in terms of cooling arrangements as mine still runs hotter than i expect.
I've got a nice dual row Coolex ali radiator, coolant reroute and it still gets to 100c (on a stand lone gauge with the sensor in the now rear
thermostat housing) without much effort. It's got a new stat also and it opens when i expect.
It might be my radiator stoneguard/grille is reducing air flow too much or that when i got it, the cooling system was a bit sludged up (i flushed it
several times and it seems clear now) and that is still an issue ?
any thoughts ?
When you say the thermostat open when you expect what temperature is that exactly? You can get them in a range of temperatures based on the effectiveness of your cooling system. You also don't say what you are doing when it gets very hot, is it sitting still in traffic or blasting along. You could also try removing the thermostat and seeing if it then over cools the engine indicating you do indeed have spare cooling capacity and that the thermostat is to blame.
quote:
Originally posted by Mr Whippy
When you say the thermostat open when you expect what temperature is that exactly? You can get them in a range of temperatures based on the effectiveness of your cooling system. You also don't say what you are doing when it gets very hot, is it sitting still in traffic or blasting along. You could also try removing the thermostat and seeing if it then over cools the engine indicating you do indeed have spare cooling capacity and that the thermostat is to blame.
Sure you don't have an air lock? Any time I've had over heating that's what it was, they can sometimes be really tricky to clear...
quote:
Originally posted by Mr Whippy
Sure you don't have an air lock? Any time I've had over heating that's what it was, they can sometimes be really tricky to clear...
Assuming this is a mk1 or 2 MX5 engine with a standard thermostat, then 100 degrees at thermostat outlet would be correct. Stat starts to open at 90
deg and fully open at 100 deg. Since there would be little or no flow in the top hose until the engine warmed up then the temp would appear as though
it suddenly shoots up from nothing.
You could try mounting the sensor in the back of the head adjacent to the ECU temp sensor and see what you get there but the cooling system should be
trying to control to 100 deg coolant jacket temp.
quote:
Originally posted by chillis
Assuming this is a mk1 or 2 MX5 engine with a standard thermostat, then 100 degrees at thermostat outlet would be correct. Stat starts to open at 90 deg and fully open at 100 deg. Since there would be little or no flow in the top hose until the engine warmed up then the temp would appear as though it suddenly shoots up from nothing.
You could try mounting the sensor in the back of the head adjacent to the ECU temp sensor and see what you get there but the cooling system should be trying to control to 100 deg coolant jacket temp.
Mine uses an MX5 1.6 turbo, its taken me a while to get my temperatures down to a manageable level, on the track it will usually sit around 95c and
may climb up to 100-103c on a hot day after being on the track for 15-20 minutes (this is soon brought down by reducing my speed for a lap, then its
ready to go again.
I have made the following modifications:
Coolex 55mm core alloy radiator
Cut down intercooler to allow clean airflow to the radiator
Cowling/ducting so air is forced to travel through the radiator/intercooler only and not forced around the sides
Coolant re-route
Lots of bonnet vents to allow the hot air to escape
Making sure the coolant pipes are correctly positioned and fitted into the expansion tank
SPAL 12" cooling fan (only really used to cool the engine when at a stand)
The Coolex radiator, bonnet vents and ducting made the biggest differences in cooling for my car, as you can imagine a turbo running 14psi boost will
produce a lot more heat than a na engine.
I also tried the following without noticing any difference:
Water Wetter coolant additive
Removing the thermostat
quote:
Originally posted by Gord
Mine uses an MX5 1.6 turbo, its taken me a while to get my temperatures down to a manageable level, on the track it will usually sit around 95c and may climb up to 100-103c on a hot day after being on the track for 15-20 minutes (this is soon brought down by reducing my speed for a lap, then its ready to go again.
I have made the following modifications:
Coolex 55mm core alloy radiator
Cut down intercooler to allow clean airflow to the radiator
Cowling/ducting so air is forced to travel through the radiator/intercooler only and not forced around the sides
Coolant re-route
Lots of bonnet vents to allow the hot air to escape
Making sure the coolant pipes are correctly positioned and fitted into the expansion tank
SPAL 12" cooling fan (only really used to cool the engine when at a stand)
The Coolex radiator, bonnet vents and ducting made the biggest differences in cooling for my car, as you can imagine a turbo running 14psi boost will produce a lot more heat than a na engine.
I also tried the following without noticing any difference:
Water Wetter coolant additive
Removing the thermostat
Yes, I use a fairly tight mesh in front of the radiator, I did think about using a larger mesh size.
Put up some pics of your engine bay, there may be something obvious to somebody.
ok some pictures - still work in progress
[img]https://postimg.cc/dL76TZHN]
[img]https://postimg.cc/SJwrLQHS]
[img]https://postimg.cc/MnVY928y]
or try these links
https://postimg.cc/dL76TZHN
https://postimg.cc/SJwrLQHS
https://postimg.cc/MnVY928y
[Edited on 21/10/20 by FFMan]
A couple things that stand out to me are, your floor is fully enclosed, could this be preventing air getting into the engine bay and allowing hot air
to escape.
My floor is open and I have a lot of side and bonnet vents to allow hot air to escape
The bottom pipe of your expansion tank looks like goes to the top of your radiator (it could be the angle of the pic), this should be returning to the
bottom pipe of your radiator, where does the top pipe of your expansion tank feed from?
The idea of an expansion tank is to take the top feed from the highest point on your radiator and allow the bottom pipe to return the cooler water
back to the lower pipe of your radiator, if you are feeding the expansion tank from two hot water feeds then this will cause overheating issues.
Is it possible to fit a cold feed to your air filter so that its not breathing in hot air from the rear of your radiator?
[Edited on 22/10/20 by Gord]
quote:
Originally posted by Gord
A couple things that stand out to me are, your floor is fully enclosed, could this be preventing air getting into the engine bay and allowing hot air to escape.
My floor is open and I have a lot of side and bonnet vents to allow hot air to escape
The bottom pipe of your expansion tank looks like goes to the top of your radiator (it could be the angle of the pic), this should be returning to the bottom pipe of your radiator, where does the top pipe of your expansion tank feed from?
The idea of an expansion tank is to take the top feed from the highest point on your radiator and allow the bottom pipe to return the cooler water back to the lower pipe of your radiator, if you are feeding the expansion tank from two hot water feeds then this will cause overheating issues.
Is it possible to fit a cold feed to your air filter so that its not breathing in hot air from the rear of your radiator?
[Edited on 22/10/20 by Gord]