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| Re: DOHC Front adapter plates |
Subject: Re: DOHC Front adapter plates
by reuby_tuesday on 2020/1/12 22:35:54
Yeah I did D,
My concern with them is that they look too small to run as the primary pump.
They are listed as an Auxiliary pump, so Im unsure as to what function they are designed for in the VW design.
Unless you have all the technical specs, their intended use is the best guide as to how they will perform in an alternative environment.
Do you have any specs of these pumps? LPM output, duty cycle, max temp ratings etc
How many would you need?
To me they look like aquarium pumps and you would need a few to make it all work. One at the bottom radiator hose (to push into the block), one at the firewall for the heater (to ensure that it gets some), and one on the intake of the radiator (to suck from the motor)
Im happy to be wrong, but output from a centrifugal pump is a function of the size of the pump housing, so little pumps cant move much water. If you want more volume, spinning the pump faster only works so far, before cavatation sets in. You have to go to a bigger housing. Plus, since these are electric, their flow is set - what you get is what you get.
Also, its a bit hard to know exactly what the water volume requirements this motor will need. Most water pumps designed for a specific motor don't provide flow rates - its a mostly irrelevant fact as 'its deigned for the intended application'.
The Davis Craig EWP selection guide gives some hints. https://daviescraig.com.au/electric-water-pumps
They sell 'booster pumps' and replacement water pumps.
The booster pumps are designed for the extra water services, such as the heater, or an Air-water inter-cooler or such.
Their guide suggests that to replace a standard water pump for a standard 2l engine needs their 80 lpm unit, and for a modified / turbocharged engine their 150 lpm unit.
When I turbocharged my V8 diesel (I know its not directly comparable), I was surprised as to how much water it wanted. Now they are a hot engine with cooling issues as well, but I upgraded to an 80 gallon/min (300 lpm) unit, (biggest I could get), but the later versions of the same motor runs a 115gpm (435lpm)unit, and for modified motors thats still not enough.
I don't think that I need that much flow, the 150lpm unit will be heaps I think, but as I mentioned, those aux pumps just look too small to run on their own.
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