Yowzer Posted July 13, 2012 Share Posted July 13, 2012 So your waterpump is designed to operate most efficiently around the 2-4k rpm mark. In a racecar style situation where your engine could happily be spinning double that, your waterpump will be outside its efficiency range, and sapping engine power for no good reason? As well as potentially cavitating and doing a shitty job of pumping coolant? So that's not really a question. My question is, how much coolant flow do you really need through an engine? Can you, for example, gear down your waterpump by 50% or so for track purposes without causing ill effects to the cooling capabilities? Discuss away. This stuff is interesting. Quote Link to comment Share on other sites More sharing options...
hmmmnz Posted July 13, 2012 Share Posted July 13, 2012 run an electric water pump. job done Quote Link to comment Share on other sites More sharing options...
My name is Russell Posted July 13, 2012 Share Posted July 13, 2012 http://www.trademe.co.nz/motors/car-par ... 564833.htm PLUS http://www.trademe.co.nz/motors/car-par ... 688226.htm Quote Link to comment Share on other sites More sharing options...
cute wee gem Posted July 13, 2012 Share Posted July 13, 2012 They are expensive though, smaller pulleys are a lot cheaper.. I think this more what he was getting at? Interesting subject. I can't really comment, but I guess it depends on how fast an engine heats the water? Some tests using a coolant temp log and thermostat opening times should answer that. Things like turbo's may boil the water if it's moving too slow? Useless post really Quote Link to comment Share on other sites More sharing options...
hmmmnz Posted July 13, 2012 Share Posted July 13, 2012 both those links were over priced, you hardly need the controller, set the flow rate with a pot or run full noise,(all sorts of motor controllers out there, even a plc is cheaper than that fan controller unit) have a electric fan running on a thermostat, Quote Link to comment Share on other sites More sharing options...
Ned Posted July 13, 2012 Share Posted July 13, 2012 or use it as an excuse to buy a link or something as you can pretend it's now $300 cheaper Quote Link to comment Share on other sites More sharing options...
Unclejake Posted July 13, 2012 Share Posted July 13, 2012 y question is, how much coolant flow do you really need through an engine? The nominally accepted figure is 80 l/pm for a smaller engine ( less than 3,000cc). I can't remember the big engine rate Quote Link to comment Share on other sites More sharing options...
Shandangles Posted July 14, 2012 Share Posted July 14, 2012 ha fuck me someone is taking the piss with those electric water pumps. http://www.ebay.com.au/itm/DAVIES-CRAIG ... 085wt_1108 Its the better alloy pump and controller for mucho cheaper. have ceen them cheaper than this too Quote Link to comment Share on other sites More sharing options...
cute wee gem Posted July 14, 2012 Share Posted July 14, 2012 Top mount water pump anyone? Quote Link to comment Share on other sites More sharing options...
Yowzer Posted July 15, 2012 Author Share Posted July 15, 2012 Convection cooling is still legit, right? Quote Link to comment Share on other sites More sharing options...
Frosty Posted July 28, 2012 Share Posted July 28, 2012 You gota love these guys, they miss the point every time. They always like spending other peoples money. LOL Increased crank speeds also affect the alternator and power steer pump as well if fitted. Run an race spec Escort years ago that went well past 8K and had an issue with the water flow and it fried alternators regularly. What I ended up doing was using a smaller crank pulley, it solved both problems at the same time. I just did the percentage change calculations and found one the right size (about 30% in my case), a bit of machining to make a custom 2 piece crank pulley. No more over heating on long runs and no more fried alternators. Only complication was the loss of the factory timing marks. Quote Link to comment Share on other sites More sharing options...
tim13 Posted July 29, 2012 Share Posted July 29, 2012 other 'oldschool' trick was to remove every second impeller blade (only advisable if you have an even number to start with .......) some factory pumps used on a variety of engines are identical except for impeller , theory is you are trying to stop either too much cavitation at high rpm and/or water can pass through radiator before it is cooled properly , as mentioned above changing pulley sizes is a good way to solve lots of these issues if practical/possible/affordable Quote Link to comment Share on other sites More sharing options...
bubblegoose Posted July 29, 2012 Share Posted July 29, 2012 alot of euros are fitted with bosh leky water pumps now (and have been for a while) might be cheaper to pull one of of these than buy a blinged up version for $3894573489573 Quote Link to comment Share on other sites More sharing options...
Yowzer Posted July 29, 2012 Author Share Posted July 29, 2012 Euro parts usually = $$$ anyway though, so I wonder if they would work out any cheaper Quote Link to comment Share on other sites More sharing options...
bubblegoose Posted July 29, 2012 Share Posted July 29, 2012 they were about 70gbp last i recall from a friendly local supplier back home Quote Link to comment Share on other sites More sharing options...
bubblegoose Posted July 29, 2012 Share Posted July 29, 2012 but i dont know what the flow figures are so i might be pissing up the wrong tree Quote Link to comment Share on other sites More sharing options...
sholdowa Posted July 29, 2012 Share Posted July 29, 2012 They are expensive though, smaller pulleys are a lot cheaper.. I think this more what he was getting at? Larger, surely?? Quote Link to comment Share on other sites More sharing options...
Simon Posted July 29, 2012 Share Posted July 29, 2012 They are expensive though, smaller pulleys are a lot cheaper.. I think this more what he was getting at? Larger, surely?? Yeah on the ancillaries. But if you go smaller on the crank then you kill multiple birds with one stone. Quote Link to comment Share on other sites More sharing options...
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