KAD44's - steam from exhaust

[eggagent]

Have a pair of KAD44's. I've had this boat for nearly 5 years and there's always been some 'steam' from the rear exhausts just below the waterline. The temperatures are fine and HX, oil cooler and exhaust elbow's checked by Volvo mechanic with no blockage found. Both sea water pumps fully reconditioned. It does not matter if its winter or summer, the steam is still there. See photo's attached.
Anyone experienced same?

 

[Montemar]

Yes.
We have two AD41B shaft drive and some steam is visible when travelling at reasonable speed though not as much as your pix show.
Apparently it is the cooling water vapourising when it hits hot surfaces in the exhaust.