Tricky-Ricky Posted May 25, 2011 Share Posted May 25, 2011 For sure, really early internal combustion engines relied totally on thermo syphon for all the water cooling, with no water pump at all. But don't try that on a 2JZ folks my great grandad told me that when he had his first car years ago the passenger had to pedal the mechanical water pump to cool his engine, and they would have to pedal like f**k when they stopped at the lights. Yes very true Chris, they hadn't thought of a water pump back in the beginning, piston oil pumps where also fun, gives the passenger something to contribute;) Quote Link to comment Share on other sites More sharing options...
heckler Posted May 25, 2011 Share Posted May 25, 2011 (edited) Talking about this thermo syphon fluid movement after shut down... why not add a secondary electric water pump which can run after the engine has shut down? OK, it would add a bit more to the plumbing. VW did this on the VR6 engines... Edited May 25, 2011 by heckler can't spell... (see edit history) Quote Link to comment Share on other sites More sharing options...
Homer Posted May 25, 2011 Share Posted May 25, 2011 so like my mate said in the beginning it doesnt increase performance or anything like that, it just prolongs the bearing life after switching off the ignition. 4 pages later.... Water cooling itself doesn't improve the performance, I didn't see anyone saying it did. What does increase performance is the dual ball bearing, which in most applications requires water cooling. Is that the summary you were looking for? Quote Link to comment Share on other sites More sharing options...
Homer Posted May 25, 2011 Share Posted May 25, 2011 It's a compromise with how your turbo drain pipe runs and achieving this 20 degree angle. The angle is only important on switch off, as it promotes thermo syphon fluid movement, With the engine running the water pump will create sufficient pressure differential to negate the need for the angled inlet / outlet. Nice to have it right, but not vital, and certainly don't compromise the drain pipe angle! This and your earlier link were very interesting, nearly every dbb water cooled system I've seen (inc my own) had the entry and exit horizontal. Quote Link to comment Share on other sites More sharing options...
spiderpigcity Posted May 25, 2011 Author Share Posted May 25, 2011 I bet these guys know all the answers Quote Link to comment Share on other sites More sharing options...
sdistc Posted May 25, 2011 Share Posted May 25, 2011 Seems to me a big point is made about water cooling being so important, but it seems that its only on shut down that it plays the biggest part ... but if you drive a turbocharged performance car you will either use a turbo timer or have the common sense to let the cooling system equalise the temps anyway! As Dick has pointed out, why is there so much emphasis placed on angles of water lines and no mention of proper cool-down periods after the prolonged hard driving that creates all this heat? Quote Link to comment Share on other sites More sharing options...
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