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The PO had lately an electric water pump installed. I just reworked the heads (head gasket was shot) but the engine is still overheating - I have just let it idling for 10 minutes or so.
I checked the plumbing and found out that the eletric water pump sucks coolant out of the expansion bottle. The bottle is connected to the heads (see picture), but the feed of the waterpump is the top fitting on the tank. That can't be right. It will suck out a lot of air, when the expansion tank is not filled completely.
Now my question: is it possible or bad for the engine to have the waterflow reversed: in my case sucking it from where the water pump was and feeding it back again in to the engine in the head via the tank? I changed the plumbing and it gives me a nice coolant flow without air. But do I miss something here? The 2 radiators are way below the engine.
Thanks for any help here?
The standard mechanical pump pushes coolant into the engine, the top engine coolant outlet from the heads goes into the top of the rad.
Why would you want to reverse this? This is all done because heat rises. To go the other way you are working against this.
I know when the coolant flow is reversed it will work against the physical characteristics, but as long as the flow of the electrical pump is high enough I hope to be on the safe side
https://www.merlinmotorsport.co.uk/know ... ce-car-323
If you try and use it the other way round you are defeating the whole benefit of having the swirl tank so might as well not have it, and just connect the heads outlet upto the radiator top hose, and have a header tank else where.
Reversing the cooling system you will be feeding the hot water from the top of the rads into the engine!
Which will keep water flowing the normal way
very nice pump, but it won't work either - it would also draw the coolant with the air from the swirl tank. The only way I see which works is to pull coolant out of the block (where the waterpump normally sits) and back in to the engine via swivel tank and the heads.
http://prod.lv2014.gener8cms.net/index. ... verse-flow