25% UDr pulley & higher compression -> cooling issues?
25% UDr pulley & higher compression -> cooling issues? I hope this is appropraite for this forum lol.
I'm a little concerned about my cooling capacity once I'm done installing a H/C combo along with 25% under-drive pulley.
Will the higher compression (SCR a wee bit over 11:1, DCR just below 8.5:1.) combined with spinning the stock water pump a bit slower cause problems with cooling? Both mods will make the car run a little hotter, plus the gas around these parts is 10% alcohol. I want to avoid detonation problems!
I don't believe a lower temp thermostat and lowering fan settings are the answer, I wish they were but the stat and fans mostly only control the minimum temp and how long it takes the car to warm up IMO.
So that leaves us with a possible water pump upgrade. (Wow those things are expensive!) Or a larger radiator. (Not cheap either and weighs more.)
This is not a race car, it will see plenty of city driving and occasionally some track.
Maybe my concerns are unwarranted. So I ask how are people making out with higher compression set ups in conjunction with 25% under-drive?
TIA
Mark
I'm a little concerned about my cooling capacity once I'm done installing a H/C combo along with 25% under-drive pulley.
Will the higher compression (SCR a wee bit over 11:1, DCR just below 8.5:1.) combined with spinning the stock water pump a bit slower cause problems with cooling? Both mods will make the car run a little hotter, plus the gas around these parts is 10% alcohol. I want to avoid detonation problems!
I don't believe a lower temp thermostat and lowering fan settings are the answer, I wish they were but the stat and fans mostly only control the minimum temp and how long it takes the car to warm up IMO.
So that leaves us with a possible water pump upgrade. (Wow those things are expensive!) Or a larger radiator. (Not cheap either and weighs more.)
This is not a race car, it will see plenty of city driving and occasionally some track.
Maybe my concerns are unwarranted. So I ask how are people making out with higher compression set ups in conjunction with 25% under-drive?
TIA
Mark
Last edited by ShevrolayZ28; Jul 10, 2006 at 11:47 AM.
Originally Posted by SiL3NtXWS6
I ran the stock water pump on a high compression iron block too with 25% pulley.
No issues however, i now run an electric pump.
No issues however, i now run an electric pump.
I think I'll give some of that Redline water wetter a try and leave it at that.
TECH Senior Member
Joined: Mar 2004
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From: BFE
Originally Posted by ShevrolayZ28
....And Texas is pretty darn hot too.
I think I'll give some of that Redline water wetter a try and leave it at that.
I think I'll give some of that Redline water wetter a try and leave it at that.
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Water is much more effective at effective than coolant for transferring heat. Also, for every psi increase, boiling point of water increases 2 degrees. ie 16psi=244 degree boiling point.
Originally Posted by Benjamin Russick
I'm a little over 11:1 compression with the stock water pump and haven't had any issues. FWIW, I was always told not to add any "water wetter" products to DexCool...
http://www.thunderracing.com/catalog...=82&sid=83#P11
Redline also says it's safe to use in Dexcool.
WaterWetter® is a unique wetting agent for cooling systems which reduces coolant temperatures by as much as 30ºF. This liquid product can be used to provide rust and corrosion protection in plain water for racing engines, which provides much better heat transfer properties than glycol-based antifreeze. Or it can be added to new or used antifreeze to improve the heat transfer of ethylene and propylene glycol systems. Designed for modern aluminum, cast iron, copper, brass and bronze systems. Compatible with all antifreezes, including the latest long-life variations.
Last edited by ShevrolayZ28; Jul 10, 2006 at 03:45 PM.
