- Joined
- Aug 19, 2009
- Location
- WA
I dont know about pressure....but I can tell you that with the stock harmonic balancer....and the early larger water pump pulley...the cooling is a good match for low idle speed cooling and I bet overall pressure. I made a pulley that was one inch larger than the large stock pulley, and it would take forever for the cooling fan to cool the motor at idle....like at a long stop light or drivethrough...Id say 5 min. Now with the large stock pulley on, takes about on min to cool the motor at idle.
Here is a cut and paste from my build thread.
And Ill post this in the waterpump thread but I observed something while cruising....its pretty wierd. I have a pretty efficient cooling system, and since going back to the stock early large waterpump pulley, the cooling fan can cool the motor down from 213* to 193* in about a minute. But while cruising down I5 at speed (75mph) theres those times when you lift for a down hill grade.....coming up to pass someone. Anyways, like most EFI systems, the injectors get cut. During that 1/4 to 1/2 mile decel or when testing from 75 to 60mph.....the motor will cool down from the constant 190* it runs to almost 180*. Just that brief time that fuel is cut and there is no heat in the combustion chamber....allows the motor to cool. The it takes about a mile to get it back to 190*. There was times before this that I saw the temp guage lower than normal but could never figure out why. So i can only imagine the heat in the cylinders at 25psi! Looking at my logs, I only gain about 1 degree in water temps during the dyno pull.
Here is a cut and paste from my build thread.
And Ill post this in the waterpump thread but I observed something while cruising....its pretty wierd. I have a pretty efficient cooling system, and since going back to the stock early large waterpump pulley, the cooling fan can cool the motor down from 213* to 193* in about a minute. But while cruising down I5 at speed (75mph) theres those times when you lift for a down hill grade.....coming up to pass someone. Anyways, like most EFI systems, the injectors get cut. During that 1/4 to 1/2 mile decel or when testing from 75 to 60mph.....the motor will cool down from the constant 190* it runs to almost 180*. Just that brief time that fuel is cut and there is no heat in the combustion chamber....allows the motor to cool. The it takes about a mile to get it back to 190*. There was times before this that I saw the temp guage lower than normal but could never figure out why. So i can only imagine the heat in the cylinders at 25psi! Looking at my logs, I only gain about 1 degree in water temps during the dyno pull.