The #4 Coolant Mod...

[Frank]

#4 Coolant Mod

Undoubtedly one of the easiest coolant mods, this will directly inject cold coolant to the #4 cylinder. This is important since the head coolant flow leads to hot stagnation with high horsepower motors.

TrboVan used 1/4" pipe on the waterpump housing and the head. A straight hose barb on the waterpump side to clear the Alternator bracket and a 90 degree hose barb on the head side. These were connected with -4an hose. Make sure to use the appropraite drill bit size for 1/4" pipe thread.

http://www.turbododge.com/forums/att...chmentid=13834
http://www.turbododge.com/forums/att...chmentid=13835
(now need picture of the hose installed Bryan.... )


BFnGA says that when drilling the holes into the head and water pump, start with a small drill bit and drill it incremently larger. He used a 3/8" NPT for his setup with a 7/16" drill bit.

(need to get pictures from BFnGA of his setup... )


Additional Notes:

Quote:

Originally Posted by cordes Whilst drilling my hole for the mod as bryan did it, I just barely nicked the passage for the head bolt. I would add that removing the valve cover to make sure of where the bolt passes through would be a good idea. I made this mistake with the head off of the car, so it has got to be an even more real possiblilty for those attempting to do it while the head is still on the car. Keep up the good work, -Brian W. Cordes

Frank