so , basically the water jacket mod is intended to increase surface area inside the water jacket for better cooling. Has anyone ever tried cutting the grooves like this???

imagine that is a water jacket lol

 

Thats what the water jacket mod is, cutting grooves in them.

Edit, do you mean cutting them lengthwise from plate to plate instead of in circles inside the jacket? I think they should be done in circles because it causes turbulance in the water = more friction = more heat removal. At least thats how it works in my head. Blue TII explained in a thread of his one time I think when he was doing it around the spark plug holes.

 

yeah thats what i meant

to me less turbulence = more water flow and the more surface area = more heat transfer

 

i agree with bluem

 

Adding turbulence pulls the coolant from the middle of the passage to the walls, which helps with the cooling. Grooving it along the flow path will help by adding surface area, but it won't help with getting the lazy flow in the middle to do more of the work.

 

You want to ADD turbulance to the water and add surface area. Not only is it stronger to mod it the old way, but theres more turbulance too, not to mention its easier to machine / grind that way to boot! Points for thinking, but the old way is better in this case.

~Mike............

 

By that mentality I am assuming that you want the coolant to spend as much time flowing over the surface area as to extract as much heat as it can possibly hold before moving on correct?

 

In the hot spots yes, you want to cool them more than the rest to try to even out the temps and prevent localized overheating.

 

So the standard water jacket mod is done around the plugs and thats it? Obviously to help prevent pre-ignition?

 

It is stiffer to do it the traditional way but the ridges do increase stress at the corner points of each cut increasing the chances for cracks to form in those areas. The round cuts would distribute this stress a little better.

The thing I don't like about adding turbulance to increase cooling ability is that it also increases pumping losses and chances for cavitation. Personally if I could get the job done some other way without causing disturbances in the flow I would try those first.