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Whats the proper rpm? |
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dborrelli 
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Joined: April-16-2007 Location: Austin TX Status: Offline Points: 67 |
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 Topic: Whats the proper rpm?Posted: May-20-2007 at 9:50pm |
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I have a feeling that my rpm is way too high. At 35 mph the rpm is around 4500 full throttle (about 45 mph) and its around 6000 is this right? oh I have a 351 commander.
thanks db |
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GottaSki
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Joined: April-21-2005 Location: NE CT Status: Offline Points: 3357 |
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Posted: May-21-2007 at 7:31am |
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Likely somebody turned your tach to '6'.
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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."
River Rat to Mole |
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nuttyskier2002
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Joined: September-28-2005 Location: United States Status: Offline Points: 669 |
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Posted: May-21-2007 at 2:17pm |
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Need a little history: prop change? new tack? any other changes?
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95 Malibu Echelon w/Mercruiser 350 Magnum Skier
Former boats: 88 Ski Centurion Tru Trac II 59 Chris Craft Capri (woody) |
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dborrelli
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Joined: April-16-2007 Location: Austin TX Status: Offline Points: 67 |
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Posted: May-21-2007 at 8:42pm |
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Everything seems to be original. I recently bought this boat and don't have the history. There is a small nick in the prop.
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dborrelli
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Joined: April-16-2007 Location: Austin TX Status: Offline Points: 67 |
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Posted: May-21-2007 at 8:44pm |
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what does that mean? |
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79nautique
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Joined: January-27-2004 Location: United States Status: Offline Points: 7872 |
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Posted: May-21-2007 at 9:02pm |
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some tach's are switable from 4,6or 8 cyl. Most factory CC tach's don't have this option, so the you need to confirm that the tach is reading right with a timing lite that has an adjustable advance and if the tach is reading right then you need to replace the prop because the pitch and or diameter is too small. Did the previous owner wake board with alot of weight in the boat? |
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dborrelli
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Joined: April-16-2007 Location: Austin TX Status: Offline Points: 67 |
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Posted: May-22-2007 at 12:49am |
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Theres really no telling what the PO did with this boat except not take proper care of it. I seriously doubt they did a lot of wakeboarding. I really have a feeling that its the prop. If so, my next question is naturally what replacement prop do you recommend me buy? And how much $$$ am I looking at?
thanks db |
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79nautique
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Joined: January-27-2004 Location: United States Status: Offline Points: 7872 |
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Posted: May-22-2007 at 1:00am |
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what year and model boat is it and what motor is in it? For the tach just look under the sdash and on the back you will see a switch if it is a switchable tach.
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: May-22-2007 at 5:38am |
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It may be ether a actual switch or a different connection terminal for 4,6,8. |
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dborrelli
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Joined: April-16-2007 Location: Austin TX Status: Offline Points: 67 |
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Posted: May-22-2007 at 11:54pm |
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I have a 78 ski nautique with a 351 commander.
Bare with me on this. The back of the tach seems to have holes in it for a wire to connect(they say, 6, 6c 8c etc but im not sure because I cant get a good look at it) There is a wire coming out of the center that is connected to one of the holes but I don't know what that hole is labeled. Does any of this sound familiar or am I way off on this? |
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79nautique
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Posted: May-23-2007 at 1:25am |
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sounds like it might be in the wrong hole maybe so your in the ball park at least.
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: May-23-2007 at 4:53am |
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db, The switchable wire should be plugged into the 8c hole. There's a quick connect in the hole and on the end of that wire.
Did you look to see what prop is on the boat yet? |
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dborrelli
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Joined: April-16-2007 Location: Austin TX Status: Offline Points: 67 |
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Posted: May-23-2007 at 12:32pm |
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Ill take a picture and post it later today thanks for everyones help. |
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: May-23-2007 at 12:45pm |
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db, A picture won't tell us much. Get the dia. and pitch that's stamped in the side.
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dborrelli
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Joined: April-16-2007 Location: Austin TX Status: Offline Points: 67 |
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Posted: June-05-2007 at 1:40pm |
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I cant find any info on the prop. Where would it be located?
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JoeinNY
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Joined: October-19-2005 Location: United States Status: Offline Points: 5698 |
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Posted: June-05-2007 at 1:52pm |
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often it is stamped into the flat face on the front of the prop and covered by the washer and nut if you cant see it thats probably where it is.
Joe. |
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GottaSki wrote: