Just thought I would add ...
If you're only comparing it to without WI, and there are no other mods, yes it will cool them.
But if you want to run higher EGT here are some mods you should probably look into:
1. Ceramic coatings. They can go on all the valves, pistons, and even combustion chambers, though they're harder to do. If too many internal parts are coated however, better materials for the external bolt on parts may be required because if less heat is absorbed into the engine, guess where that heat goes. (Better alloy exhaust turbines, ceramic coated turbines, race cats etc.)
2. Nimonic or Inconel alloy valves, while slightly heavier, and only slightly better conductors of heat, are FAR more temperature stable. They are extremely hard to damage. My Saab Viggen has Nimonic exhaust valves, and Brad from KC Saab on this board will tell you just how hard these cars are to damage. Also you might consider a better alloy for the exhaust turbine on the turbo.
3. Forged pistons can withstand higher temps, they're always a plus at higher tuning levels, but they are generally less reliable. Forged metal expands more when heated, so they're very loose fitting when cold. This causes more blow by and engine wear. Probably best not to buy them if you aren't gonna need em.
Sorry for such a long post, but I thought it would be a good idea to list these sorts of things. WI will let you run higher EGT without knock ... but if the EGT does go too high for the valves, only lowering the EGT will save them. Add more water.
Hope this is useful ... take it easy and be careful!
Yours Truly,
Adrian
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