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Fuel Locker

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StSimon
Captain

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USA
298 Posts

Initially Posted - 09/14/2007 : 20:49:20

Does anyone know the internal vertical dimension of the fuel locker on the port side of a '84 SK SR? I have a 6.5 gallon Tempo which has the same basic footprint as their 12 gallon but is 4 3/4" taller. I know that sounds like a lot of fuel for a Honda 9.9 kicker but I'd love to have the extra fuel for those low wind days when we're way out

Thanks,

Andy
Breakin' Wind, '84 SK SR

Edited by - on

StSimon
Captain

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USA
298 Posts

Response Posted - 09/16/2007 : 18:37:52

I was able to measure myself. It won't fit.

Any idea how long a Honda 9.9 will run at WOT with 6.5 gallons?

Thanks,

Andy

Edited by - on

Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts

Response Posted - 09/16/2007 : 18:45:34

If I wanted extra gas I would get a set of cooler chocks with a tie down and simply put it back by the scuppers. Lots of boats have exposed gas cans.

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aeckhart
Master Marine Consultant

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USA
1709 Posts

Response Posted - 09/17/2007 : 12:36:41

I've cruised lake Superior the last 6 years with a 12 gallon tank between the seats and strapped to the transom. It fits nicely without taking up a lot of deck/leg room. The only drawback is that it has to be removed to access the gas tank locker. I have found though that with practice I can remove the fuel line from the 12 gallon tank, push it forward, open the fuel locker, and attach the fuel line to my 6 gallon tank before the fuel in the line is consumed. The outboard never misses a beat.

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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts

Response Posted - 09/17/2007 : 15:32:19

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by StSimon
 Any idea how long a Honda 9.9 will run at WOT with 6.5 gallons?<hr height="1" noshade id="quote"></blockquote id="quote">
First of all, WOT is just a waste of fuel. You shouldn't need much more than half throttle to run 5 - 5.5 knots, and my high-thrust Honda 8 (actually the same engine as the 9.9) consumed no more than 2/3 gallon per hour at that speed. That suggests you'll be down to half a gallon after 9 hours. WOT makes the stern squat, increasing the wake (and drag), and can't push you past hull-speed of about 6.3 knots--all of that for probably 30-50% more fuel, carbon emissions, and noise.

Edited by - Dave Bristle on 09/17/2007 15:34:20

John Russell
Master Marine Consultant

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USA
3444 Posts

Response Posted - 09/17/2007 : 20:11:42

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Dave Bristle
 <blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by StSimon
 Any idea how long a Honda 9.9 will run at WOT with 6.5 gallons?<hr height="1" noshade id="quote"></blockquote id="quote">
First of all, WOT is just a waste of fuel. You shouldn't need much more than half throttle to run 5 - 5.5 knots, ....<hr height="1" noshade id="quote"></blockquote id="quote">

What's WOT?

I was thinking of this on my way into the marina tonight. I had the throttle just barely above "Start" and was making 4 knots. I wonder if it has something to do with the ultra long shaft on my Tohatsu.

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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts

Response Posted - 09/17/2007 : 20:29:30

Edited by - dlucier on 09/17/2007 20:30:37

Dave Otey
Navigator

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USA
112 Posts

Response Posted - 09/17/2007 : 21:28:40

I don't have the dimensions you are looking for but I'd like to share this. I found a 7.5 gallon tank by Tempo that fits in my 91 fuel locker with a minor mod. The stock elbow ports to the back of the locker which has insufficient room for adequate bend radius. I bought a fitting that ports paralleling the tanks length aft. I have a Nissan 9.8 two yrs old and it burns about i/2 gallon per hour at 5 knots in calm wind and air. You probably wonder why I have a need for a tank this large. On Lake St Clair you could find yourself motoring over twenty miles if you are cruising to a destination at the other end of the lake. Every square inch is a premium so I keep all my fuel in one spot above deck.
Fairwinds

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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts

Response Posted - 09/17/2007 : 21:49:14

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by John Russell
 ...I had the throttle just barely above "Start" and was making 4 knots. I wonder if it has something to do with the ultra long shaft on my Tohatsu.<hr height="1" noshade id="quote"></blockquote id="quote">On engines I've had, it seems like "Start" was somewhere between 1/4 and 1/3 throttle--at least well above idle. (If my Honda 8 was warmed up, I'd start it on idle--never on Start.) So it makes sense that you wouldn't need much more than that to get to 5 knots or above. It also seems to me that the first 3-4 knots come very easily, while the power needed to get to 5-1/2 or 6 is disproportionate to the lower speeds. Thus, 6 knots becomes very fuel-inefficient.

My current boat seems to have two speed ranges... 0-7 knots (idle to 1600 RPM), and then 15-30+ knots (2500-5500). It's sorta like there's nothing between 7 and 15, because once it jumps on plane, it jumps to that second range. Anything in between is bow up, plowing a huge wake, not going much faster, and wasting lots of fuel. It's analogous to a C-25 trying to get to 6.5 knots under power, except that I have ample power to exceed hull speed.

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The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.