:whacked: Read an article put out by David Vizard on partially filled water cooled blocks
His words : The question is, does such a move have a place in high output street and circle track motors.
By pouring block filler up to the freeze plug holes, the bottom third of the block is prevented from flexing, leaving the top 2 thirds of the blocks stiffer as a result. With this process, it is possible to generate more horsepower from the engine. This obviously improves ring seal and power due to less bore flexture.
However, we also get an advantage in temperatures. As much as 2/3 of the block can be filled before it has a significant effect on water temeperatures. The reason for this is that most of the heat in an engine occurs within the top inch or so of the block. From there down, temperatures drop considerably. Water temp can be kept down to 170degree fah. As a result of the block filler insulating the crankcase the oil temp is raised to 210 deg fah. Having oil and water at these temps is worth a measurable amount of horsepower. Eg a 300 hp chevy has up to 12 hp increase.
I have a few questions of my own:
- I recall on these forums that iron head small block chevys are prone to detonation at 1 full point of compression ratio as compared to the aluminium heads. So I am reasoning that if I can pull the water temp down to 170 deg f will this ward off detonation?
- I feel that this area of partially filled blocks needs more scrutiny from the more knowledgable members of CHR.
Thanking you.
S
:HMMM: :)