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NS Corse Turbo

Cooling my Turbo Engine

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One of the things that came up in convevrsation was coolant flow which in an ideal world, needs to be in the region of 1L/min/kw to stop localised boiling - well as i Have over 350Kw it is doubtfull that i will find a pump with 350L/min flow, but my DC pumps are rated max 115l/min.
The figures I was quoted were of course for an ideal world for a turbo engine, but the basic idea is the higher flow the better. A second problem with the DC pumps is that i was running their controller, so at times there was zero flow through the engine, or a very low flow, puerly based on temperature - also not good.....
Both the DC pumps were dripping when i got the car home, so the boost pressure in the water system has either blown the o-ring seal or cracked the casing... either way I am sick of them leaking, so they are out - if they are still good then they will be spare for the charge cooling system..

The revised cooling system will see the alfa pump re-installed, but the thermostat will be a remote one close to the radiator which will allow me to run an electric booster pump in series, in the main coolant circuit. This pump will be a stewart components E558 pump as shown below - this flows 210L/minute max and will switch on once the engine is warm (60C) or if the boost goes over 8psi, to ensure i have max flow when needed.

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Updated 21-11-2013 at 15:35 by turbonutter

Categories
Corse Build , Engines

Comments

  1. ducatiman's Avatar
    Neil a couple of questions:
    1. Have you heard of any recommended flows stated for non-turbo engines ?
    2. If the cooling flow is too fast through the engine then there could be a danger of reduced heat transfer from the engine to the cooling fluid due to the high velocity, so there must be an optimum flow.......................
    3. Are these pumps a direct replacement in pipe size ?
    4. I will aslo assume an increase in power for the pump motor.
  2. turbonutter's Avatar
    Quote Originally Posted by ducatiman
    Neil a couple of questions:
    1. Have you heard of any recommended flows stated for non-turbo engines ?
    2. If the cooling flow is too fast through the engine then there could be a danger of reduced heat transfer from the engine to the cooling fluid due to the high velocity, so there must be an optimum flow.......................
    3. Are these pumps a direct replacement in pipe size ?
    4. I will aslo assume an increase in power for the pump motor.
    Hi Andy,
    1) The recommended flow i was given didnt actually specify a turbo engine, i just assumed. Also it was for an ideal world! I have also seen somewhere that the flow should be 1/3 of the BHP/minute. i.e. 300BHP = 100l/min.
    2) I see what you are saying about the heat transfer, but the idea is to stop localised boiling, steam pockets & zero heat transfer. Heat transfer will be rduced per cc of water passing, but it will pass faster, so there will be more heat exchanges fo a given time & the differentilal temperature between the engine and teh water will be on average lower, so it may improve cooling... especially if you avoid steam bubbles.
    I dont think its such an issue with your engine, as you have only around half of the specific output of my engine, so half the heat to deal with....
    3) size wise they are not a direct replacement, as the inlet and outlet are inline instead of 90 deg. Pump inlet/outlet is 45mm on my pump. Length is 160mm & pump diameter is 112mm. The controller box can be remote mounted. (note controller is not a speed controller, it is just to run the pump, as it is a brushless motor. Pump runs at continous speed)
    4) current draw is quoted as under 10A, so the same as the DC pump.

    I have mailed you the paperwork that came with the pump....