Sv29/ilmor 725/indy
09-30-2012 | 06:29 PM
#31
Registered
Joined: Oct 2000
Posts: 2,797
Likes: 397
Hi Smarty,
I would usually do before and after comparisons but logistically as we are in England and i needed the bare castings to check wall thicknesses before i did the reprofiling this just wouldn't work for me, but if i've got it wrong i'm pretty handy with a welder
Peter
I would usually do before and after comparisons but logistically as we are in England and i needed the bare castings to check wall thicknesses before i did the reprofiling this just wouldn't work for me, but if i've got it wrong i'm pretty handy with a welder
Peter
Last edited by Smarty; 10-01-2012 at 12:38 PM. Reason: added the word gain
09-30-2012 | 07:22 PM
#32
Registered
Joined: Jun 2006
Posts: 2,057
Likes: 0
By the looks of the second to last pic the trailing edge looks pretty sharp.
10-01-2012 | 11:26 AM
#36
Thread Starter
Registered
Joined: Dec 2008
Posts: 218
Likes: 1
From: Hamble Le Rice England
A few more shots of the almost completed lower unit, i will leave the final sharpening of the edges until the drive is installed on the boat as there is a possibility that it could get a few marks in transit.
Peter
Peter
10-01-2012 | 11:34 AM
#37
Registered
Joined: Aug 2003
Posts: 2,975
Likes: 12
From: Charlotte, NC
Very nice work but clearly some of the effort you put in is from an esthetics stand point since the underside of the cavitation plate will be well out of the water once at speed. Wouldn't you agree? Looks great even if it doesn't yield you 1mph. I didn't notice nor measure any real difference in my profiled lowers. I was told high speed steering stability would also benefit from this process. Again not something me the NON-RACER was able to notice but I don't think one can go wrong cleaning up the surfaces to make them smother & symetrical.
10-01-2012 | 11:48 AM
#38
Thread Starter
Registered
Joined: Dec 2008
Posts: 218
Likes: 1
From: Hamble Le Rice England
Very nice work but clearly some of the effort you put in is from an esthetics stand point since the underside of the cavitation plate will be well out of the water once at speed. Wouldn't you agree? Looks great even if it doesn't yield you 1mph. I didn't notice nor measure any real difference in my profiled lowers. I was told high speed steering stability would also benefit from this process. Again not something me the NON-RACER was able to notice but I don't think one can go wrong cleaning up the surfaces to make them smother & symetrical.
Totally agree that the under side of the cavitation plate will gain no speed but as the boat will be run in salt water mostly the better finish that you put on the lower unit the less corrosion you get and it is much easier to keep looking nice with a bit of WD40 and a scotchbrite pad every time you come out. I have also done the sides and top of the cavitation plate for the same reason, plus it has quite a nice "bling" factor....
Peter
10-01-2012 | 11:55 AM
#39
Registered
Joined: Aug 2003
Posts: 2,975
Likes: 12
From: Charlotte, NC
Looks great. Normally the lower is painted ILMOR silver from where it begins to flair out towards the cavitaion plate all the way to the top side so it matches the upper which is also Silver. My WCM profiled lowers shown here.
10-01-2012 | 11:41 PM
#40
Registered
Joined: Mar 2008
Posts: 3,613
Likes: 375
From: Traverse City MI
Very nice work but clearly some of the effort you put in is from an esthetics stand point since the underside of the cavitation plate will be well out of the water once at speed. Wouldn't you agree? Looks great even if it doesn't yield you 1mph. I didn't notice nor measure any real difference in my profiled lowers. I was told high speed steering stability would also benefit from this process. Again not something me the NON-RACER was able to notice but I don't think one can go wrong cleaning up the surfaces to make them smother & symetrical.
