The balanced sleeve thermostat allows pressurized coolant to circulate around all of it's moving parts, and equalizes the system pressures above and below the thermostat’s moving valve. The coolant, being under water pump pressure, is used to help the reverse poppet thermostat stay closed when it is cool so as to prevent leakage. The reverse poppet thermostat opens against the flow of coolant from the water pump. Both types function in the same manner, but have distinct differences. There are two basic types of thermostats currently available: You have the balanced sleeve thermostat, and the reverse poppet thermostat. I do know that there is a thread on this forum 50 pages long dedicated to informing people to avoid water pumps with stamped steel impellers in favor of a water pump with a cast iron impeller. I believe this is more due to my properly set up cooling system as a whole than it is any one particular component. My coolant temp never gets above 185˚F regardless of the driving or environmental conditions. I've been running one, with a properly clearanced divider plate (thanks Jim Hand!), in my T/A for about 7 years now. The only imperical data that I have is on the Flowkooler water pump. I´m using a new RodneyRed aluminium cooler (including an AT transmission cooler) and temperatur is borderline so I´d like to upgrade to a high volume WP together with the according thermostat.Ĭoncerning the thermostat AmesPerformance recommends a heavy duty thermostat opening at 180 degrees (part# FN255W, USD 10.00) but ClassicIndustries recommends the MrGasket High Performance thermostat, opening at 160 degrees (part#16400, USD 14.95).Īny suggestions would be highly appreciated! I´ll use one of them together with an stainless water-pump backing plate I bought from R.A.R.E., too (part# SSWP-1, USD 35.00).įor the moment I run - as told above - a regular 11-bolt WP on my (professionally restored and slightly upgraded) 68 400 YS (GTO) block in my 68 Firebird. Not sure if this justifies the 40$-difference.? So - big question for the experts: which one´s the best?įunny thing btw - when you look closer you´ll notice that the Milodon and the FlowKooler water pumps are exactly the same (!!) except an additional welded-on inner closing plate on the FlowKooler pump. In the middle it´s the FlowKooler Performance WP bought at AmesPerformance (AP part#FN258AL, FK´s own part#1649, USD 129.00!):įinally on the RH side it´s a high volume WP bought from R.A.R.E. Here are closer pics of the rotor (I was told that´s the really important part of the WP): On the far left side you see a Milodon High Volume WP bought from Classic Industries (part# 16281, I paid USD 99.95, now 89.99). Hope to get more input here in this special section.Ĭoncerning my topic: I have 3 different high volume water pumps ( ea 69 11-bolt style) to choose from for my (already with a stock 69 water pump equipped) 68 Firebird:Īll three of them are aluminium high volume, using exactly the same casing made in Japan (although the one in the middle from FlowKooler has the "made in Japan" grinded out - but they forgot to grind out the part´s number on the inner side.) First of all a Happy New Year to all of you! I posted the same thread on FGF-board.
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