gvowzcar Posted January 1 Posted January 1 Hi All, first time, I have 1973 240z, with recon L28, was overheating so replaced radiator and viscous fan setup with new 4 core aluminium radiator and new 2x10" electric fans with shroud, no more overheating but when the fans start they send a vibration through the whole car, can feel it in steering wheel when stationery, and the radiator support panel is vibrating, have disconnected both fans independently and vibration reduces but still there, so both fans seem out of balance or ?? Has anybody else had this problem and if yes what is the fix?? Any ideas, crappy cheap fans or ?? Thanks Graham Quote
RichyRich Posted January 1 Posted January 1 Are the fans running at the correct rpm? If it’s much too high, any imbalance will be magnified. The force caused by imbalance is a function of the unbalance mass x rpm^2. So any error in the rpm has a magnified effect because that term is squared. So is the voltage being supplied to the fan motor when on correct? Just an idea based on theory. Quote
gvowzcar Posted January 2 Author Posted January 2 thanks for response Richy, I assume running at correct speed, 12V, 80Watt fans, running off 12v system, possible I guess to add a resister of some sort to slow them down. Thanks for responding and the idea, Graham RichyRich 1 Quote
gvowzcar Posted January 2 Author Posted January 2 if anybody else uses electronic cooling fans, can you suggest some brands that have been used that were ok, don't want to buy 2 new fans that are also cheap crap and have same issue. Quote
Enzo Posted January 3 Posted January 3 Is the vibration present when the fans are switched off or only when they turn on. Supply a picture of the fans as mounted and the water pump where the fan was removed. When the fan was removed, did you just take it off or replace anything to the water pump. Quote
gvowzcar Posted January 12 Author Posted January 12 Hi Enzo, Thanks for the response, sorry delay in responding, lost access for a few days. Vibration not there when fans are off, took viscous fan off and removed studs from water pump and bolted pulley on to water pump with short stainless bolts. 4 core radiator with shroud and fans bought on the net via ebay from a company based in sydney. Came with relay, temp sensor etc. all works fine. Only about 1cm gap between pump pulley bolts and electric fans, but not touching. Had a hard time adding photos, hope ok Quote
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