If I put a multimeter from the battery negative to the coolant in the radiator I get a reading between 0.25 & 0.3V.I found this test from a very old post of Chewy's on TwinTurbo.net. Apparently if it's above 0.3V it will cause corrosion in the radiator and possibly the engine due to a possibly faulty earth somewhere.Can anyone dispell or confirm this theory and what are your own voltage figures? :?) PS: Yes, who else but Chewy would think of trying this It was back in 2001 apparently ...
There's no real safe limit. ANY potential difference (voltage) between the engine block and the radiator spells trouble for the radiator, because the iron block pinches the electrons from the aluminium in the radiator (and all other aluminium parts), and causes them to corrode. Whereas you can minimise the potential difference by having a good engine block earth, good radiator earth and good coolant, you can never really get rid of it all. So - check battery earth, engine block earth, and try to earth the aluminium of the radiator better, replace the coolant with a known good quality one, and that's about the best you can do.
An oldie but a goodie, even back then u were a propeller head [image]http://members.optusnet.com.au/markfield/burnout.gif[/image][image]http://members.optusnet.com.au/markfield/burnout.gif[/image]
