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Jet Boats
General Jet Boat Discussions
Holeshot- Does Displacement matter?
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<blockquote data-quote="LarryMc" data-source="post: 432173" data-attributes="member: 13895"><p>Been looking at 90hp 2 Strokes to replace the 4S 60/40 on my boat. The boat is 16' long, 55" wide and heavy for it's size. Seems like it takes forever to get on plane with the 4S compared to the 2S I used to have. There is a lot of difference in the displacement of the motors I have been looking at, but they are all rated at 90hp and all use the same 7 3/8" impeller. Brian of Outboard Jets told me that they shoot for 5000 RPM at WOT for all their jet kits. Below are the Displacement figures for the motors I have been looking at;</p><p></p><p>Johnson 90-105.4 CI </p><p>Mercury 90 - 84.6 CI</p><p>Yamaha 90 - 69.9 CI</p><p></p><p>There is about a 30-60 lb weight difference between the motors. But I think that can be discounted. Obviously, the Johnson has the lead on the displacement. So does that translate into a better holeshot for the Johnson over the other motors assuming the same boat and same WOT RPM for all the motors? I'm thinking it will, but don't really know. Opinions?</p></blockquote><p></p>
[QUOTE="LarryMc, post: 432173, member: 13895"] Been looking at 90hp 2 Strokes to replace the 4S 60/40 on my boat. The boat is 16' long, 55" wide and heavy for it's size. Seems like it takes forever to get on plane with the 4S compared to the 2S I used to have. There is a lot of difference in the displacement of the motors I have been looking at, but they are all rated at 90hp and all use the same 7 3/8" impeller. Brian of Outboard Jets told me that they shoot for 5000 RPM at WOT for all their jet kits. Below are the Displacement figures for the motors I have been looking at; Johnson 90-105.4 CI Mercury 90 - 84.6 CI Yamaha 90 - 69.9 CI There is about a 30-60 lb weight difference between the motors. But I think that can be discounted. Obviously, the Johnson has the lead on the displacement. So does that translate into a better holeshot for the Johnson over the other motors assuming the same boat and same WOT RPM for all the motors? I'm thinking it will, but don't really know. Opinions? [/QUOTE]
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