Hello I have a 1981 century 4000 21' cuddy. my rpms. are excessive about 5500 wot. my prop is 14"x 19 pitch engine is 260 mercruiser 5.7 v8.top speed is about 35mph. with 2 people. but comes on plane great. unless there are more people on board..My question is what would be the best prop to help with better all around performance?.. also my tach, may need replaced. cause the engine does not sound like its running that fast. any help would be appreciated ..Thanks
Check the setting knob on the back side of your tach. It could be on the wrong setting. When I bought my last new boat the tach was reading wrong from the get go. I pulled the instrument panel off and the tach was set on the outboard setting. It needed to be on the V-8 setting. I changed the setting and from then on the tach's read accurately.
There should be a slotted knob on the back that you can change the setting with a screwdriver.
Good luck, hope it's as simple as that.
1981 Carver 3007 Aft Cabin
2004 Past Commodore
West River Yacht & Cruising Club
Well I feel stupid..lol. A it turns out ,I followed some poor advise. My tach was set on position 4. where I was told it needed to be,for a four pole alternator.I was in the process of removing my Tach. when i noticed that #3 position said V8. I rest my Tach to #3 and BINGO! Tach dropped a thousand RPMS. took boat for a ride and Tach was still reading high at W.O.T. but closer to where it should be. I beached the boat and changed prop from 19 pitch to 21 pitch.She is now almost spot on.. I'm really happy. her rpms are still a little high so I am gonna try a 23 pitch next..At least now i am not worried that my engine is gonna explode due to over rev,. thank for any and all advice.
No reason to feel stupid this is how we learn! This is the reason for forums like this and this is why it would be a shame for them to turn off this forum even if the use is down I think it should simply be promoted more and encourage more boaters to come share and learn!!
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