pump above tank

[sambeeb]

Hi,

Just wondering how much higher than the tank the pump can be mounted. I would be vertically mounting the pump with its inlet 400mm above the lowest point of the tank. The tank would only be a 1.5m run away, on the opposite side of the engine bay. Am I likely to run into priming dramas with this set up considering that i'll be using a solenoid?

If due to possible priming dramas I do end up having to go for a boot mounted tank, is there any functional reason why the pump, solenoid, boost pressure switch etc can't still all be engine bay mounted?

thanks for any help

sam

[Richard L]

As long as there are water in the line, The pump can be several feet above the water tank.

This is not as important if you have an Aquamist system. The system automatically turn off the system and activate the failsafe if the water level goes below the level sensor for more than 20 seconds. This will not allow the system to run empty and needs re-priming. A fully baffled tank also improves the risk of air entering the system. Real pain to get rid of without re-priming.

The Aquatec pump is not fully hermetically sealed from factory. There are no less than seven locations where water can enter the pump and kills the bearings (see image below).

The solenoid valve should be in the engine bay (aquamist), as close to the jets are possible.

I don't believe you have an aquamist system?

[sambeeb]

Thanks Richard.
Yes you are quite right that I don't have an aquamist pump. I'm desperately trying to get a boost triggered system in place before a Bathurst Mt Panorama hillclimb event that's comng up. So I'm running (very temporarily because I don't think i'll trust it for long) a generic 100 psi 5L/min diaphragm pump to get me up and running.
I did a bench run yesterday and like you say it amazed me how long it takes for any air that has entered the system to completely work its way out and also how badly it affects nozzle performance. So based on that and your advice i'll definitely be fitting a tank empty pump cut sensor. Do you ever utilise a tee'd bleeder?
I'm using your 0.4mm 'C' nozzle on a vw 1.8T 20v turbo.


sam

[Richard L]

The only way to rid of all the air out of the system is to re-prime Not a quick job. If the air is lodged inside the pump head, it will be more complicated

An active level sensor scheme and baffled tank is the best way forward.

[jondee86]

Originally Posted by Richard L

The Aquatec pump is not fully hermetically sealed from factory. There
are no less than seven locations where water can enter the pump and
kills the bearings (see image below).

Just considering the implcations of your comment here; what precautions
should be taken to prevent water entering the motor bearings ? Would the
effects of pump leakage be mitigated by mounting the pump vertically with
the motor shaft down ? Do you have other recommendations ?

Cheers... jondee86

[Richard L]

I have no solution at the moment, too many gaps. Place the tank and pump in the trunk.

If there is an internal leak, there is no salvation.