I disagree. Most/all of that water has only been inside the cylinder block at that point.No need for any 'restrictor'. By the time the water gets to the upper rear portion of the intake, it has run its course as a coolant and needs to go directly to the radiator.
I disagree. Most/all of that water has only been inside the cylinder block at that point.
So why doesn't all the water leave the engine there then?
Why? Because what you take from the rear doesn't get to pass through the heads and have a chance to cool them.
Essentually the rear ports can work as a cylinder head bypass and that's not good.
A restrictor may be required to stop too much passing out of the rear and starving the heads of coolant.
Anyway, I'm yet to see any real information on the advantage or even the reuqirement of rear ports. ..at least on the street cars we drive.
Can someone give me one good reason?