Originally Posted by thirdchildhood

If it really made much difference then Mercury would most likely have included some kind of external water jacket to cool the oil.
QUOTE]

The XR has a finned top cap. Is this for looks or to help cool?

I agree that the bravo 1 when used in its HP rating (of 400?) no external cooling is needed.

Originally Posted by gary cook

Yes on the warm water but warm water is better than no water plus i run my engine cold about 110 deg and the oil temp is around 230 deg so the water that is hitting the drive is not to bad as far as temp.

My drive is high enough that no water really touches the top when we are running so all the flooding i can get is good.

Between flooding water on it and and amsoil the white heat chaulking on the top of the drive has went away for the most part and i would have to say that what we must be doing something right because i raced for almost 3 yrs on the same drive before it broke this year.

Or maybe its just my super human throttling skills

Originally Posted by charliem

The finned cap is stronger and is supposed to help dissipate heat.