i have a few questions i hope someone can clear up on them...

1. exactly why would i want them? does the water at the rear of the block become stagnet and it cools more evenly with them?

2. if it does cool more evenly, why dont the majority of aftermarket intake manifolds have it?

3. where do the rear lines connect to? above the thermostat or below it? can i connect hardlines like i drew on the picture below?

4 can someone give me a pro and con breakdown of them? why wouldnt i want to do this?

 

There' not much reason to use it on the street. The stock cooling system path does a FAIRLY GOOD job of distributing coolant evenly throughout the engine. Of course, FAIRLY GOOD is not good enough for racing - especially on engines that see full throttle and heavy loads for long periods of time.

4-corner coolant allows coolant to exit the head at the rear (through the normally unused rear coolant ports), go through external tubes, one per head, up to the front of the intake manifold and rejoin the water jacket near the thermostat (still BEFORE coolant passes through the stat, though). Saves the already hot coolant at the rear of the head from having to pass all the way to the front of the head through internal passages again before exiting the engine. More even flow to both front and rear cylinders reduces the chances of getting a "hot spot" somewhere in the head.

 

so if you were to say, run a car under load at WOT for about a hour, it wouldnt be a bad idea to run some lines from the ports to the front crossover?

would there be any downside to having it like that on a daily driver?

any forseen problems with the way i showed in the pic?

how big (or small) should the lines be to be effective?

 

i could have SWORN i had attached the pic.

 

Close. You'd run lines from the screw-in fittings at the rear to the screw-in fittings at the front. They don't have to rejoin the coolant water jacket right at the thermostat, they can be a few inches away.

Of course, if you need those front screw-in fittings for something ELSE (coolant sensor, vacuum switch, etc.) to hook up to you can start to see why this is a PITA for a street engine

 

yea, i can already see that.

if i can fit a tap back where i put thoes lines though, it would be nice to hookup... if only for a lil extra insurance...


while this is mainly a "nice day daily driver" toy, i really would like to be able to run some of thoes hwy races out west without worry.

 

is there a specifc name for this setup?

im having a heck of a hard time searching for it......

 

anyone?

any additional help would be... umm...... helpful.

 

I beleive it's called 4 Corner Cooling. I have seen it on some big inch small blocks, especially with high (13:1) compression for added insurance against detonation.