[Public-List] Engine Power Loss

[Meinhold, Michael J.]

You may get 2000 RPM at the dock straining against the docklines, but
since the prop is more efficient when the boat is moving forward, it
absorbs the maximum power of the engine at lower RPM.  


What's your speed at 1200 RPM underway? 


Mike Meinhold / Naval Architect / SAIC
4321 Collington Road, Suite 250, Bowie, MD 20716
Office: (301) 352-4734  Cell : 410 271 5394
Michael.j.meinhold at saic.com


-----Original Message-----
From: public-list-bounces at lists.alberg30.org
[mailto:public-list-bounces at lists.alberg30.org] On Behalf Of Cole,
Andrew L
Sent: Wednesday, September 12, 2007 7:48 AM
To: public-list at lists.alberg30.org
Subject: Re: [Public-List] Engine Power Loss

Brian,

It is puzzling that you can get power in gear at the dock, but not
underway.  

This may be directly or indirectly a fuel quality issue.

If you have a fuel filter, yank the element and see if it's all full of
crud.  The ethanol gas in particular does not get along well with water
and will go bad quickly.  That can gum up your carb., or worse, stick a
valve.  If the filter is crud-filled, drain the tank, get a better
sealed filler cap, change the filter element and re-fill the tank.

If you have access to a compression tester, check each of the cylinders
to ensure you don't have a stuck valve.  These low compression 4cyl.
engines will run well enough on two cylinders to fool a mechanic into
thinking it's running normally unless he puts load on it.  If you don't
have a compression tester, you may be able to see the valves through the
spark plug holes, if so, you can check to see that each is moving up and
down on each pair of revolutions.

If you're lucky, neither is the case, but you may as well check to
eliminate possible causes.

Andrew Cole
Andante - 152

> When the transmission is in forward, neutral and reverse at the dock I
get about 2000 RPM. 
> However when I leave the dock I cannot get the RPM's over 1200 in
forward.

>Brian - Putachieside - 496

Cole, Andrew L
Admitted in Maryland, Virginia & Florida One Corporate Center
10451 Mill Run Circle, Suite 1000
Baltimore MD 21117

 
tel: 410 581-7408
fax: (410) 581-7410
mob: (410) 206-3577

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