Hi all, I think the post that has been referred to elsewhere regarding hydraulics was a rather long thread, where a few of us had discussed our respective issues and fixes.
I have a 82 Bounty 34 centre cockpit, ex hire, located in France. It has a Perkins 4.108 motor and a gear pump and vane hydraulic motor.
My saga (and expansion of my knowledge on the subject) has continued unabated.
Last year I think I posted a series of numbers that I had produced by comparing engine revs to driveshaft revs at various rpm points, and showed we had an effective reduction in gearing presumably through wear and a slight leak in the valve system.
We replaced the valve unit over winter and had a noticeable improvement in performance - roughly a 100rpm less for any given speed.
After LOTS of thought, I am about to replace the entire drive train with new, I am thinking about changing the geared pump for a far more efficient (and more expensive) vane pump as well if I can work out how to get the adaptor plate modified.
The hydraulic train is incredibly inefficient, particularly when worn, and a more sensible person would just get another boat, but something keeps making me perservere to see if I can get hull speed out of the old dear one day!
I will post updates after winter, when I have something to say!
,
Peter