engine cooling via freeze plugs?

tkeaton

tkeaton

Master Velocipede Alchemist
Joined
Mar 20, 2005
Location
Chattanooga
Was watching some engine vids on the youtubes and saw a build that tied the freeze plug openings on either side of the block together with hosing, that looked to have AN fittings on the front side for connecting to....

Can someone point me in the direction to learn more about why/what/how/huh is going on with this?
 
Probably to fix a cooling deficiency from cylinder sleeves that are too close together, etc., or for some head/block arrangement that is missing cooling ports through the head/block interface.

Turbos need a tiny amount of water compared to the block, and it's easy to tap them off of some existing port somewhere. You'd have to be pretty hard up for places to tap cooling lines before you'd use the freeze plugs... There's a lot of water cooled OEM turbos, like my WRX for example.
 
Thanks for the suggestions, I guess I could have posted the video to start with....



Check out 5:08 to see what I am asking about
 
Yep, that's a parallel cooling setup, to introduce coolant in the middle of the block instead of along the block. That gives more consistent cooling from cylinder to cylinder, so you don't have problems with the rear cylinders running hotter than the front cylinders because of the flow path along the block. It's something only necessary on race engines as far as I know, as power and reliability are both affected by the temperature spread of the individual cylinders. It's really down to particular block families, and correcting inadequacies with the stock coolant flow path, or putting huge sleeves in the block that need extra help because the sleeve diameter is blocking coolant flow.
 
Fabrik8 said:
Yep, that's a parallel cooling setup, to introduce coolant in the middle of the block instead of along the block. That gives more consistent cooling from cylinder to cylinder, so you don't have problems with the rear cylinders running hotter than the front cylinders because of the flow path along the block. It's something only necessary on race engines as far as I know, as power and reliability are both affected by the temperature spread of the individual cylinders. It's really down to particular block families, and correcting inadequacies with the stock coolant flow path, or putting huge sleeves in the block that need extra help because the sleeve diameter is blocking coolant flow.
Click to expand...
X2. I've seen racing engines use that setup. The 6.7 powerstrokes have something similar but it's built into the casting of the block. Coolant flows into the block from the pump through an extra outer cooling jacket that's separate from the jacket surrounding the cylinder walls. It feeds into the inner jacket through windows that way each cylinder can get the same access to cool water vs the back cylinders getting the leftovers from the front of the block.

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