Anybody have any factual data on cylinder head temperature distribution for a stock LC2? Or coolant temperature distribution in the cylinder heads? I'm curious about both the back to front as well as the left head vs. right head variations. And even better would be before and after data with respect to cooling system modifications like high flow pump, rear coolant crossover, "steam holes" next to center cylinders, etc.
One thing I've come to believe about our engines is that as we push it beyond it's original operating parameters, it becomes more and more critical to bring critical variables (temperatures, air/fuel ratio, etc.) under control. Whether it is air distribution within the plenum (let's hear it for the RJC power plate), fuel flow through the injectors, or cylinder head temperatures, we can only perform as well as the weakest link (i.e., cylinder) will allow us. So, among many other things, I'm trying to decide on how much effort to expend on the cooling system on my current rebuild. I'm particularly intrigued by Smokey Yunick's y-pipe for our little V6! I've already got an aluminum radiator, flowkooler coolant pump and lots of Evans NPG+ standing by. I'm toying with the notion of separate, remote thermostats for the coolant return off each cylinder head (rather than the rear coolant crossover) as a natural extension of Smokey's y-pipe concept to reduce the temperature spread between the hottest and coolest cylinders.
It will also allow me to use a larger, less restrictive thermostat than our dinky stock size and get more benefit out of the high flow pump. And I sure need it here in Houston with a front mount!
Unfortunately, I can't collect any before data because I'm out of commission with a flat #3 exhaust lobe. And I probably couldn't afford the instrumentation either!
Anybody seen any GM data from years gone by?
Anyway, enough rambling.
Thanks,
Buzz White in Houston, TX (sumnerw@flash.net)
One thing I've come to believe about our engines is that as we push it beyond it's original operating parameters, it becomes more and more critical to bring critical variables (temperatures, air/fuel ratio, etc.) under control. Whether it is air distribution within the plenum (let's hear it for the RJC power plate), fuel flow through the injectors, or cylinder head temperatures, we can only perform as well as the weakest link (i.e., cylinder) will allow us. So, among many other things, I'm trying to decide on how much effort to expend on the cooling system on my current rebuild. I'm particularly intrigued by Smokey Yunick's y-pipe for our little V6! I've already got an aluminum radiator, flowkooler coolant pump and lots of Evans NPG+ standing by. I'm toying with the notion of separate, remote thermostats for the coolant return off each cylinder head (rather than the rear coolant crossover) as a natural extension of Smokey's y-pipe concept to reduce the temperature spread between the hottest and coolest cylinders.
It will also allow me to use a larger, less restrictive thermostat than our dinky stock size and get more benefit out of the high flow pump. And I sure need it here in Houston with a front mount!
Unfortunately, I can't collect any before data because I'm out of commission with a flat #3 exhaust lobe. And I probably couldn't afford the instrumentation either!
Anybody seen any GM data from years gone by?
Anyway, enough rambling.
Thanks,
Buzz White in Houston, TX (sumnerw@flash.net)