08-27-2007, 07:50 PM #1
Does the triple bearing mod cost top speed?
Has anyone done a before/after comparison with the triple bearing pump mod and top speed? The reason I am asking is because of the larger than average tail cone that is on the pump...? I have spoke to the nice people at Skat and they confirmed that it is indeed larger and that it is the only option (except expensive one off custom jobs) It would seem that the larger cone takes the space of water (thrust) and sacrifices some top speed?
One can look at my mods and see that I am running at 74 to 75 mph...8050 to 8100 rpm...these speeds were all done in 90+ air, 90 water, and 70% humidity or weather very similar to it...I know this is not bad especially for the weather and stock venturi...just want to know if I am 'sacrificing' anything with the triple bearing mod?
I see others running at 76, 77 and even some 78+ with the same mods...I know adj venturi ring will help and I have a set coming...
08-27-2007, 09:10 PM #2
I have never seen a decrease in speed with the skat tripple bearing pump mod.
08-27-2007, 10:59 PM #3
A larger cone in theory would increase top speed. A smaller one would help holeshot. If you are getting adjustable venturi, you should be able to dial it in nicely. Your speeds are right on for those temps. Run it in 60 air and 60 water and you would gain 200 rpms and 2 mph easy.
08-28-2007, 12:49 AM #4
08-28-2007, 08:08 AM #5
i called skat recently and he doesnt do the tripple bearing mod any more becuase racers were complaining of more drag, he now does double bearing mods.
Users Browsing this Thread
There are currently 1 users browsing this thread. (0 members and 1 guests)
By fzsaust in forum Yamaha PWC Performance (4-stroke)Replies: 34Last Post: 02-12-2012, 10:09 PM
By BPnta in forum Yamaha PWC Performance (4-stroke)Replies: 17Last Post: 06-22-2009, 12:02 AM
By RXTXMAN in forum 4-Tec PerformanceReplies: 7Last Post: 08-31-2008, 05:45 PM
By rxpblast in forum 4-Tec PerformanceReplies: 3Last Post: 01-11-2007, 10:40 PM
By Jeff C in forum Sea Doo Open DiscussionReplies: 28Last Post: 05-26-2006, 10:47 PM