Water Pump Pulley

[SECURITY]

tonight i was throwing around ideas with my bro in law wondering how we could fix the #6 always running lean problem. we know that #6 is the last bore on the coolant flow path, which in turn makes it hotter than the rest which is why we think they always go first.

we also know that people have been throwing around the idea that the plenum design makes #6 get more air which also doesnt help the situation (i havent seen any hardcore data so im assuming its just a theory, correct me if im wrong).

we thought about getting a slightly smaller water pump pulley to speed up the water flow around the motor. has anyone ever heard of anything like this? i know there are higher flowing water pumps out there but i guess this mod would be fine for a 250-300kw car.. also a bit lighter on the pocket.

is the r32 water pump pulley smaller? or does anyone know where i could find one?

[Craved]

speed it up and you'll more than likely encounter some cavitation issues with the water flow

thus reducing the actual amount of water being passed through the engine.

will wait for other ideas to pass around

[2rismo]

Craved, that's the very first thing that occured to me when I read the title of this thread.

SEC, you could make your problem worse by doing what you suggest.

No.6 running lean can be a simple fix with a tune.

[SECURITY]

i was asking a few v8 guys today.. they've seen it done to a few cars. im sure if the size of the pulley was 4-5mm smaller in diameter it wont have that kind of effect.

[Busky2k]

First of all I would try increasing the coolant cap pressure as this can help raise the coolant efficiency by a small amount.

Then I would try some Redline Water Wetter Additive and/or reducing the coolant dilution ratio down a bit more to increase the efficiency of the coolant once again. (to 20%)

Third, run cylinder 6 a little more rich than the rest, like +3%!

Hope these tips help.