have a 20ft proline cuddy with 200 johnson, according to manual should run at 5-6000 rpm at wot, right now running at 4200 at wot (35mph) with 14.25 x 21pitch 3 blade, also: will change in diameter affect rpm like change in pitch? thanks
Hi, Soce.<br /><br />Has it always been this way? You are way down in WOT rpm and in top speed. Did it ever get to 5500 for you?<br /><br />First, confirm that your engine is running on all 6 and throttles are opening all the way. That much loss of rpm suggests that you may be running on 5 cylinders.<br /><br />A 21" seems a bit long. A larger diameter would improve "grip" on accelleration, but shouldn't affect top rpm or speed much.<br /><br />If you are running 6 strong cylinders, get a dealer to loan you a 19" and try it out. You may need to drop to a 17".<br /><br />Tell us how you are using your trim when on plane.<br /><br />Good luck.
Just went through the same situation<br />Have a 205 Sundowner Cuddy with a 200 hp Rude Ocean pro<br />14x18 Raker was awesome with RPMS in the 5600 range, hole shot that is sweet.... top end at 50ish<br />14 1/4x19 5200 RPm decent hole shot, top end 53ish with decent load. <br />14 x21 great top end but RPMS to low under 5k. hole shot stunk. <br />Were thinking about shaving some off the 14x19 SS and see if we can improve hole shot. <br />Also ventilation holes on SS make a HUGE difference at hole shot with no impact on the top end. <br />These were all Stainless Steel. ALumuinum just don't cut it on this strong of motor. <br />Hope this helps.
