I just bought a 1980 Cape Dory 25 Hull #602. The boat is in great shape but has the original 9.9 Johnson outboard which must be replaced. The current set up looks somewhat juryriged to fit the engine well... Can anyone recomend an engine that can fit in the well that allows the control arm to fit through the opening to the cockpit? What seems to be appropriae horse power? Any other suggestions about powering a CD25... Please help. Thanks.
Seacliff2@aol.com
*CD25* What engines fit and power a CD25?
Moderator: Jim Walsh
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Carl Nord
Re: *CD25* What engines fit and power a CD25?
Douglas McMullin wrote: I just bought a 1980 Cape Dory 25 Hull #602. The boat is in great shape but has the original 9.9 Johnson outboard which must be replaced. The current set up looks somewhat juryriged to fit the engine well... Can anyone recomend an engine that can fit in the well that allows the control arm to fit through the opening to the cockpit? What seems to be appropriae horse power? Any other suggestions about powering a CD25... Please help. Thanks.
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Carl Nord
Re: *CD25* What engines fit and power a CD25?
Mercury used to make an engine (around 9 hp) and as an option you could purchase a very short control arm. The whole deal fits very nicely into the CD 25 well and you could easily close the cover. Johnson and others may also offer this option.Douglas McMullin wrote: I just bought a 1980 Cape Dory 25 Hull #602. The boat is in great shape but has the original 9.9 Johnson outboard which must be replaced. The current set up looks somewhat juryriged to fit the engine well... Can anyone recomend an engine that can fit in the well that allows the control arm to fit through the opening to the cockpit? What seems to be appropriae horse power? Any other suggestions about powering a CD25... Please help. Thanks.
Based on my experience a 9 or 10 hp engine is fine. However the well makes it noisey and it used to have to be open to keep smoke out.
Carl
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Arenius, (Virginia), CD26
Re: *CD25* What engines fit and power a CD25?
Hi,
As you already know, there are a couple of problems to be worked out with an outboard in an engine well which is not generally addressed by boat manufacturers in their design. They include idle exhaust, engine installation space, and controls accessibility.
My CD26 did not have enough space to mount a Yamaha 4 stroke, 9.9 HP which the boat dealer wanted to sell (and I wanted) for the boat.
The problem was the location of the boat mounting bracket. It was too far aft which resulted in inadaquent room between the back of the engine and the back of the engine well. The engine would not fit even though the overall depth of the engine easily fit into the well space.
I did not want to move the side support brackets of the engine brackets in the well. This is usually a reinforced fiberglass area. I suggested to the dealer that two 1-1/2x1-1/2x6" oak "spacers" be placed between the face of the backets and the wood engine mount board. This moved the wood engine mount board forward 1-1/2" and gave me the room I needed. My CD26 has two full sized "companion way" style drop boards which open the entire front face of the engine well into the cockpit. I can just remove the top board and the engine control arm drops over into the cockpit giving me all the controls within easy reach. The thru bolts for securing the wood engine board to the side brackets had to be lenghten to increase allowance for the additional 1-1/2 thickness.
There are only a couple of "measurements" which you can make which will determine if a specific engine will fit.
1. Overall engine head depth (front to back) Include any forward projection of a folded engine control arm.
2. Engine mounting yoke surface face to back of engine head distance.
3. Bottom of engine well opening size. Will the front edge of the opening clear the engine skeg if the engine had to be moved forward?
A 9.9 HP is the right horsepower for the 25. But HP is not really what we are looking for....it is thrust force. HP=thrust force X RPM.
Two cycle engines have higher RPM for the same HP. That means they have lower thrust force capability than the same HP in the slower RPM 4-cycle engines. I would recommend you also take a look at the newer 4 stroke engines when you consider the replacement. Less smoke, less fuel consumption, generally higher thrust force (slower RPM, larger props).
Dana
arenius@jlab.org
As you already know, there are a couple of problems to be worked out with an outboard in an engine well which is not generally addressed by boat manufacturers in their design. They include idle exhaust, engine installation space, and controls accessibility.
My CD26 did not have enough space to mount a Yamaha 4 stroke, 9.9 HP which the boat dealer wanted to sell (and I wanted) for the boat.
The problem was the location of the boat mounting bracket. It was too far aft which resulted in inadaquent room between the back of the engine and the back of the engine well. The engine would not fit even though the overall depth of the engine easily fit into the well space.
I did not want to move the side support brackets of the engine brackets in the well. This is usually a reinforced fiberglass area. I suggested to the dealer that two 1-1/2x1-1/2x6" oak "spacers" be placed between the face of the backets and the wood engine mount board. This moved the wood engine mount board forward 1-1/2" and gave me the room I needed. My CD26 has two full sized "companion way" style drop boards which open the entire front face of the engine well into the cockpit. I can just remove the top board and the engine control arm drops over into the cockpit giving me all the controls within easy reach. The thru bolts for securing the wood engine board to the side brackets had to be lenghten to increase allowance for the additional 1-1/2 thickness.
There are only a couple of "measurements" which you can make which will determine if a specific engine will fit.
1. Overall engine head depth (front to back) Include any forward projection of a folded engine control arm.
2. Engine mounting yoke surface face to back of engine head distance.
3. Bottom of engine well opening size. Will the front edge of the opening clear the engine skeg if the engine had to be moved forward?
A 9.9 HP is the right horsepower for the 25. But HP is not really what we are looking for....it is thrust force. HP=thrust force X RPM.
Two cycle engines have higher RPM for the same HP. That means they have lower thrust force capability than the same HP in the slower RPM 4-cycle engines. I would recommend you also take a look at the newer 4 stroke engines when you consider the replacement. Less smoke, less fuel consumption, generally higher thrust force (slower RPM, larger props).
Dana
arenius@jlab.org
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David Evans
Re: *CD25* What engines fit and power a CD25?
Carl:Carl Nord wrote:Douglas McMullin wrote: I just bought a 1980 Cape Dory 25 Hull #602. The boat is in great shape but has the original 9.9 Johnson outboard which must be replaced. The current set up looks somewhat juryriged to fit the engine well... Can anyone recomend an engine that can fit in the well that allows the control arm to fit through the opening to the cockpit? What seems to be appropriae horse power? Any other suggestions about powering a CD25... Please help. Thanks.
I am in the same position as you, and I ended up buying a Tohatsu 8hp two stroke. I wanted a four stroke motor pretty badly, but the outboard compartment is quite small, and the weight penalty you pay is substantial. I hear that the sterns tend to sit down in these boats. The other close contender was the Johnson/Evinrude 8hp two stroke (those guys, by the way, make a four stroke eight that could be crammed in there if you alter the transom mount and widen the cutout for controls). I asked an old Cape Dory employee what horsepower was appropriate, and he said 8hp would be adequate power. I chose the Tohatsu because I have friends with seasprites and they love the Tohatsu 5hp. It may sound to you that I obsessed on this choice a bit, and that would be a fair statement. This is what us sailors do when we can't sail. I must say, though, that this bulletin board has helped the winter slip by. I nominate Walt as Cape Dory man of the year.
evansd@ride.ri.net
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kevin aubuchon
Re: *CD25* What engines fit and power a CD25?
I use a Evinrude 9.9 HP 2-stroke. My previous motor was a 5 HP Suzuki, I thought that was underpowered for a CD25. The Evinrude is a close fit in the well, but it does fit. I put a tube on the exhaust and ran it down to the bottom of the engine well to keep smoke from the cockpit. It seems to be working. Good luckDouglas McMullin wrote: I just bought a 1980 Cape Dory 25 Hull #602. The boat is in great shape but has the original 9.9 Johnson outboard which must be replaced. The current set up looks somewhat juryriged to fit the engine well... Can anyone recomend an engine that can fit in the well that allows the control arm to fit through the opening to the cockpit? What seems to be appropriae horse power? Any other suggestions about powering a CD25... Please help. Thanks.
kevin aubuchon
kaubuchon@worldnet.att.net