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- Jul 23, 2011
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Volvo has no position on this. Even Mercruiser doesn't say you have to time them.
Timing has nothing to do with anything.
Venting can lead to cavitation, which over a period of time causes blade erosion, or cavitation burn
If your getting prop burn your over trimming causing the water to boil on the prop edges
8 years of installing my F5's just by slapping them on every year in whatever position they go on and none of these issues
correct, Neither VP or Mercruiser have any official stance on this. however it is in published documents by both Abermarle and Carolina Classic regarding VP duo prop drives and prop burn (possibly stemming from the same VP blog site contributor that Maclin commented about)
on the 3 different boats with lat 80's / early 90's DP drives that I have had the pleasure of putting props on, I can tell you it makes a difference regarding prop burn and is noticeable in a short time frame. When I first bought the current boat, by not clocking, I got prop burn on a new set of B5's in under 2 hours. found out about clocking from a few VP owners as well as the late Don S. after repainting and clocking, the props lasted until a collision with a sunken sail boat (about 250 hours) bent the blades on the forward prop.
as for the suggesting that it is operator induced ventilating causing the prop burn.... my pig of a boat is too dang heavy and drafts too much to get the prop close enough to the surface to ventilate without bringing the drive up to the transom (45 degrees up).
if anyone wants to clock their props or not clock their props. I know it makes a difference in my own experience, so I will continue to clock them
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