Much better than the std setup and better than the Eliseparts one anyway.
This is true with a 82/88 deg stat. if you’re going lower, it could be the opposite, though!
ok, now I need help again
To an extent the heat gradient can be improved when using a regular 'stat by drilling a small (2mm) hole in the shroud of the thermostat, this will give a minimal flow of coolant while the thermostat is closed and lessen the heat gradient when the 'stat opens. It’s a bit of a blunt instrument but can help with both the close coupled 'stat and the remote 'stat.
Dave
What about the heater circuit, does that not allow the fluid to circulate at least through the heater matrix even at startup?
I can see the coolant returning from the heater circuit in my expansion tank.
(and I have the Eliseparts one)
Simon,
You make far too many assumptions, most of them are incorrect.
If you could narrow your posts to the productive rather than taking sideswipes at people then the BBS would be a happier place.
I have mentioned that is is a blunt instrument, but it works extremely well especially for those where a remote 'stat is not possible, or where a QED type is already installed or for those who do not necessarily want to upgrade to a PRT installation. In a standard installation it makes for a better heat gradient either side of the thermostat which is a large part of the problem. It is a modification that has been common for at least 8 years.
FWIW I have installed remote thermostats on mid engined cars as far back as 1985…
It is worth letting people know all the options.
Uldis, not all engine installations have heater circuits, but yes these are effectively unregulated (other than the heater valve) coolant circuits from one side of the block to the other.
Dave
The heater circuit joins the original bypass before entering the stat housing. The housing itself is the real bottleneck for the original bypass, as its size is less than 14mm. This was originally intended to increase bypass coolant speed hitting the bulb.
The drilled thermostat helps only the first time the stat opens from cold, but it is of little help afterwards. It also adds some seconds to the heating up time, as keeps the bulb slightly colder. IMHO it is a good mod for those cars with a relatively small rad, but the very efficient rad used on the Elise/Exige does need a more radical solution, especially on a cold, misty environment.
I see you are spouting the same old hackneyed garbage again…
Give it a rest , it’s really rather tiresome.
No-one is suggesting that drilling a hole in the 'stat is a 100% solution, but it is effective during the warm up cycle prior to the first deployment of the 'stat.
FWIW you have seen only a tiny fraction of the cars with engine work done by me…
Dave
Try to keep the thread on subject Simon…
Dave
The “bypass” as you call it is infact not a bypass, it’s the sole means to circulate water until the stat opens. None of the Powertrain coolant engineers or Bill recognise it as a bypass.
Sorry for my bad english (it’s not my mother tongue, after all), but how do you define a circuit that taps off the main circuit, bypasses the thermostat and re-joins the main circuit just after it?
I thought bypass was the right word…
Yawn…
Dave
In the original circuit that 18mm path returns coolant directly onto the stat in the stat housing, it does not bypass it.
it returns coolant AFTER the thermostat valve (if it was joining before it, there could not be any flow at all) and hits the thermostat bulb. so AFAIK yes, it does indeed bypass the thermostat valve.
it returns coolant AFTER the thermostat valve (if it was joining before it, there could not be any flow at all) and hits the thermostat bulb. so AFAIK yes, it does indeed bypass the thermostat valve.
Nope it returns Directly onto the stat bulb [you can see the stat bulb through the balance takeoff opening] to open it, and this was a careful design feature. Effectively the remote stat does exactly the same thing but with a 32mm path rather than 18, and hence opens faster.
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I think you’re missing the point… in the pic the coolant flow is from left to right (>>>>>>>) and with the stat closed the coolant bypasses the stat dish (valve) via the bypass circuit.
If you measure the inner diameter of the housing small side inlet (bypass), you’ll also see it’s far less than 14 mm.