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losing speed |
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81nautiqueskip 
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Joined: June-13-2007 Location: United States Status: Offline Points: 8 |
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 Topic: losing speedPosted: July-09-2007 at 7:55pm |
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thanks in advance for advice. this site is a great resource. 1981 351 stock. i replaced the packing gore tex from skidim, set at 2 drips per minute. felt a little drag while cruising @ 25 mph. loosened to drip every 10 seconds still at cruising speed some intermittent slowing of speed. whats going on?
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1981skinautique 3/4 done
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8122pbrainard
Grand Poobah 
Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Posted: July-09-2007 at 9:53pm |
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81, Something else must be going on since I doubt if you would notice a drag from a too tight shaft packing. Was the shaft log (port) and packing assem. running hot?
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eric lavine
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Joined: August-13-2006 Location: United States Status: Offline Points: 13413 |
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Posted: July-10-2007 at 10:01am |
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watch your tach carefully and let us know if you see any spikes or anything out of the ordinary when this happens, please post anything else that you can think of that might be different while you are operating the boat
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"the things you own will start to own you"
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81nautiqueskip
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Joined: June-13-2007 Location: United States Status: Offline Points: 8 |
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Posted: July-10-2007 at 11:14am |
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the packing assembly is running warm. not hot, warm. everything else seemed normal. i'll check tach carefully next outing. thanks
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1981skinautique 3/4 done
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Posted: July-10-2007 at 11:35am |
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81, They will run warm at first and then cool down so that is normal and not the intermittent slowing you are getting at cruising. Tell us more about the boat.
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81nautiqueskip
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Joined: June-13-2007 Location: United States Status: Offline Points: 8 |
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Posted: July-10-2007 at 12:09pm |
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high hour stock 351/velvet drive/rebuilt carb/well tuned/runs really well/idles smoothly and accelerates to top speed perfectly/water temp steady/all seems good except this new light "drag" after repacking stuffing box.
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1981skinautique 3/4 done
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Munday
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Joined: August-17-2004 Location: United States Status: Offline Points: 538 |
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Posted: July-10-2007 at 8:48pm |
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I think you'd have to have an alinment issue to feel any drag as you speak of.Is it harmonic,equally spaced time wise between the increased drag?
Munday |
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81nautiqueskip
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Posted: July-10-2007 at 10:10pm |
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i don't think it's alignment. all redone floor/stringer's 5 years ago very solid feeling mounting bolts tight through rails and no problems before new packing. not equally spaced just a light intermittent rubbing. i'll put in thursday and try to be more specific. thanks. skip
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1981skinautique 3/4 done
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stang72
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Joined: July-31-2004 Location: United States Status: Offline Points: 1608 |
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Posted: July-11-2007 at 3:07am |
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81....get under the boat and turn the prop by hand(not running of course)it should turn with very little effort and evenly with no binding spots. If it does not turn like that...see Eric's alignment post.
New floor, mounting bolts solid....thats all great , but the engine still has to be aligned! Check it so you know for sure! |
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Posted: July-11-2007 at 7:53am |
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I don't think it's alignment ether because the problem is intermittent plus it would take a major misalignment before you could feel it. With problems like this, sometimes you wish that it would just stop dead so you could find the problem! You may be chasing this for awhile. Have you looked at fuel delivery? Tank pick up, anti-siphon, rubber fuel line, fuel pump, PSI to carb?
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81nautiqueskip
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Posted: July-11-2007 at 10:00am |
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the prop turns evenly with no binding spots, i'll pay attention to fuel delivery.
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1981skinautique 3/4 done
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