Pendennis Posted October 28, 2012 Share Posted October 28, 2012 Looking at reducing my water pump revolutions, notice Burton do one which is a Cosworth product @ £87.00 plus vat. Has anyone bought this or know the diameter or know of another similar equivalent product? Ian Link to comment Share on other sites More sharing options...
Pat the Plumber Posted October 28, 2012 Share Posted October 28, 2012 Can i ask Why? are you running high revs, if so why doesn't the R500 use one. Too much cooling, is it cavitation? Link to comment Share on other sites More sharing options...
Pendennis Posted October 28, 2012 Author Share Posted October 28, 2012 Yes high revs, its set at 8.7k and when the temperature is up around 90c it cavitates. The CC R500 does not go that high, mine is race engine and is always up at 8.7k. Interestingly my last race engine was set at 8300rpm and although it did it occasionally, not quite the same, so this issue must occur around 8500rpm. Link to comment Share on other sites More sharing options...
dannylt Posted October 29, 2012 Share Posted October 29, 2012 I had one and it seemed to work fine. Seems a cheap thing to try relative to the cost of your engine! I had a large alternator pulley too, to the extent it didn't charge at idle. Link to comment Share on other sites More sharing options...
Pendennis Posted October 29, 2012 Author Share Posted October 29, 2012 Yer, got the 72mm alternator pulley already, mine charges at idle Thanks to a very nice person, it appears I am about to get the water pump pulley as well. cheers Link to comment Share on other sites More sharing options...
dannylt Posted October 30, 2012 Share Posted October 30, 2012 My alternator pulley was over 100mm from memory! Link to comment Share on other sites More sharing options...
Pendennis Posted October 30, 2012 Author Share Posted October 30, 2012 No wonder it didn't charge at idle, that's Frank Bough 😳 Link to comment Share on other sites More sharing options...
AMMO Posted October 30, 2012 Share Posted October 30, 2012 Danny Your alternator pulley was 80mm, not 100mm. The crank pulley was 100mm and the water pump 125mm. Yes, it probably didn't charge at idle but when you did 2 days open pit lane at Spa and covered 500 miles, how much time did you spend at idle and how much pretty much flat out at 9,000 rpm? For a trailered track only car it was the right decision I think. Later 310 bhp spec engines than yours with the smaller crank pulley for mixed road and track use ran a 65mm alternator pulleys. I've been running an 80mm alternator pulley on the road with no problems but with the larger stock crank pulley. I've also been running one of the 125mm water pump pulleys I had made on the road with no cooling problems. Pendennis The larger water pump pulley is definitely the way to go. I've been fitting them to a lot of my engines since about 2005. Never had any problems as long as your cooling circuit is OK and you have a good rad. I used to use the Pace race rad. Worked fine. There were some made by Cosworth at the same time as mine, funnily enough also 125mm (we came independently to the conclusion that this was the correct size). They made two different types. One was solid, the other wasted and lightened. The lightened ones had a tendency to crack and were later replaced by the solid ones. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now