Originally Posted by lucky ribster
the max rpm range is 5150-5850 .
i think we was pulling 5200 ish at wot with 3 up and lots of fuel.
i would just like a prop with better grip- any ideas ?
Keep in mind that for every pitch number about 200 revs are involved and you need 600 revs higher, theorically 3 numbers off. If you have already a C-13.5 look for at least 2-3 higher pitched props to give you very near or 5850 revs.
Better ask the Toh dealer to suit you with the proper prop, unless you have lots of different prop pitches to test one by one and useless if you do not have a tacho on the engine to see the difference readings on how the rpm goes higher with a higher pitched prop tested, a matter of trail & error water test.
One issue still not clear is: Nobody knows as exact sciense if you should wot your boat/engine configuration with just one mate/few gallons of gas/almost empty or wot as you would usually use it, that is with more ? mates, full gas tank and lots of things inside. In my particular case have prop/wotted my sib/ engine with just me, 2 gallons of gas and an empty sib and at full throttle just 50 rpm less that max engine rpm which is 5800, with 1 higher pitch. When I'm alone, will know that at full throttle my engine will be reving at the limit of the max rpm without problems, with more weight will rev less but still safely between min and max rpm to that engine. That's way engines are being delivered with intermediate props so you can pitch play and adjust for your type of boating needs.
Have taken the nuisance to write several engine manufacturers and ask them the same tech question, no one has ever answered back, so probably they don't lnow for sure neither which is the correct answer. Bottom line, you don't cruise at wot all the time, so to have a little more or less rpm at wot won't do no harm to any engine. Even Ribnetters have dispare positions about both tech issues.