Dave/ Iain
My inlet manifold/ heads combo has no facility for a thermostat.
Therefore I decided to go with the Davies Craig pump with controller. This only flows up to 110L/min which thinking about it is quite low compared to the Mezieres, but I have never yet seen a thermostat option for Meziere or CSR etc. The DC pump controller uses a temperature probe sort of in line. You can insert it into a hose connection close to the head outlet, or you can drill a thermostat housing and insert it in there. In my application I hope to be able to drill one of the -16 adaptors and insert it in there, otherwise I will have to use push on hose on the head outlets. The pump speed is then controlled to maintain the correct temperature. It pulses 5v to the pump while the temperature is low, and as it rises the voltage become constant, varying the voltage applied to the pump from 5V to 12V. It also automatically runs on at full voltage for up to 2 minutes after shutdown to avoid heatsoak.
I have no issue with the fact that 2 of -12 would be adequate for the flow of the pump, but I don't want a low pressure area in the heads. The previous owner had threaded the drive belt inlet ports to 3/4NPT, but had threaded into this a 90 degree -10 adapter. Why???!!!!!
The Meziere Y port adaptors have -20 on the single side and -12 on the twin side. That is the biggest Y port adaptor I have found. Using that, there is no point going bigger than -12 on the inlet side. Rather than using stainless hose for this I am going to use superflex silicone hoses (relatively cool inlet coolant) so from the Y port use -12 O ring to 3/4 hose adaptor, to 3/4 hose. In the block I will put a 3/4NPT to 3/4 hose adaptor. This is the best way I can think of to maximise the flow into the block.
In order to avoid the low pressure in the block/heads I will then put a -16 to -12 reducer on the outlets and run -12 hoses to another Meziere Y port adaptor. If drilling the -16 adaptor doesn't work out I will have to find a way of using push on hose to be able to insert the temperature probe. From there into the swirlpot and then back under the car to the radiator.
If the pump does not flow enough I suppose I could always put a Meziere 35gpm in parallel to run when the Davies Craig pump sees 12V, but I hope the one pump will be enough.
