Twin 50s vs. Twin 60s for 22' C-Dory

Larry H · Posted: Fri Mar 02, 2007 12:40 pm Post subject:

Capt'n Bill,

Have the motors ever reached maximum RPM?

Have you tried lower pitched props?

Is the bottom clean and smooth? A small amount of growth can slow the boat.

Larry H

Wayne McCown · Posted: Fri Mar 02, 2007 12:58 pm Post subject:

Dear Bill:

I agree with several other respondents: two 60s would put you into an overweight situation. With several hundred extra pounds hanging off the back of your CD-22, you might find it even harder to get up on plane (at the least, it might require more horsepower and require a higher speed to stay on plane). The extra hp (and weight!) could significantly unbalance your CD-22 and ultimately prove self-defeating.

I have a 1999 CD-22 with twin Honda 40s (which weigh 210# each = 420 # total). WOT (in smooth water at 5200 rpm) = 33+ mph; it cruises nicely at 4000 rpm = 25 mph. It gets on plane--and I can keep it on plane (as when cruising the Erie Canal)--at 10 mph.

I suspect that new motors would give you more speed, even if you were to stay with twin 40s or 45s. Certainly, given the choice you present, I wouldn't even consider the 60s. The 50s should prove more than adequate for speed, and keep your CD in better balance.

For what it's worth,
Wayne

SEA3PO · Posted: Fri Mar 02, 2007 8:35 pm Post subject:

I have twin 40hp Yamaha's.....but if I was to do it over again...I sure like that new Honda 90... lighter and sure allot more power... the new engines are so trouble free that it almost is not an issue...unless ya hit something.... and I guess that could do in any engine.... that's why ya carry a kicker..

Why do you want to go so fast ??? without a bunch of load I can do 30 but almost never do...it's uncomfortable in the ocean...most of our cruising is done at 15 to 17 or less.

Joel
SEA3PO

Capt'n Bill · Posted: Sun Mar 04, 2007 5:45 pm Post subject: Thanks Everyone

Thanks everyone for all of the excellent reponses to my inquiry. No, I am not some sort of speed freak but reading what others have had to say it just sounds as though I have never experienced the full power that my 45s should have provided. Having no other reference point, I had grown a bit paranoid that 100HP was not going to be enough. Now, i see that it will be more than adequate with new engines and the correct prop for my boat.

Appreciate all of you single engine fans, but here in the islands we all like the added security of twin engines. In fact, the last time I was out I found myself limping home on one engine when the other failed. I knew all along that I would most likely be replacing with either the Suzuki or Yamaha 50s, since they are the only fuel injected engines in that size range. I've had it with fussy carburetors, particularly since I can only get fule with 10% ethanol here. I know the Yamahas are lighter, however, I have access to a great deal on the Suzukis right now where they will cost around $1000 less per engine and will come with a free 6 year warranty like the Yamahas have through the end of this month. Also, the mechanic that I have used for the past year is a Suzuki dealer and I can continue to use his services for any warranty work. I am sure that they will be good, reliable engines.

So, thanks again,

Bill Showalter

Captains Cat · Posted: Sun Mar 04, 2007 7:14 pm Post subject:

Bill said: "I have access to a great deal on the Suzukis right now where they will cost around $1000 less per engine and will come with a free 6 year warranty like the Yamahas have through the end of this month. "

Bill, as you know, nothin's "free", it's just factored into the price. That having been said, you made the right choice, in my mind. I haven't decided what to do yet, my 45's are still going strong. Keep us posted on the replacement progress and the things you run into. That is a topic that hasn't been covered here! Would be interested in what you find about mounting holes, steering, controls, etc, etc.

Charlie

thataway · Posted: Sun Mar 04, 2007 9:14 pm Post subject:

A lot of folks with excellent experiences with the new Suzuki engines. Good choice, especially since you have a mechanic nearby.

Capt'n Bill · Posted: Tue Mar 06, 2007 12:10 pm Post subject: Re-Powering Topic

Sounds like a great idea to let people know what i go through during the repowering process. Will be installing a new Teleflex hydraulic steering system at the same time. Had ordered it for my Honda 45s since my mechanical steering cable was in need of replacing. Just had to amend the order with a different cylinder and am waiting for my mechanic's input on whether to use the Teleflex tiebar vs. the Suzuki tiebar.

B.T.W., another topic that has been mentioned is thru-hull transducers. When I installed my Furuno fishfinder I installed a 1000W thru-hull transducer. As far as I know, very few C-Dory owners have done so out of reluctance to drill a hole through the bottom of the hull and the complexity of the installation, but the flat bottom of the C-Dory in the centerline near the transom is actually ideal for a thru-hull transducer. It turned out great and at some point I will post some Pics and explain the install process.

Bill

starcrafttom · Posted: Tue Mar 06, 2007 12:32 pm Post subject:

bill do you ever loose the bottom when running at high speeds with that thru hull. I loose the bottom all the time when on plane. If its deeper them 80 ft and I am on plane I loose the bottom Half the time. under 80 ft and its not a problem. Anyone else having these issue's?

Capt'n Bill · Posted: Tue Mar 06, 2007 1:39 pm Post subject: Loosing Bottom

Don't know about losing bottom. Haven't been able to get my boat to high speed yet. Will let you know after I re-power.

Bill

Wefings · Posted: Tue Mar 06, 2007 4:29 pm Post subject:

Tom , sorry for ther delay on the question on the Cruiseship with the Honda 90 . I wish I could tell you first hand what the motor is like , but I have been away alot . I am home now and will load it up and try it maybe this weekend . I do know that my service guys got 24 Knots GPS with light load and 2 people aboard when they tested it ! I am anticipating about 20 Kts when all the goodies are on board and bottom is painted . Probably cruise at 15 Kts . Ill post more pics also when I can get her in the water for my first overnight adventure !
Marc

james · Posted: Tue Mar 06, 2007 4:36 pm Post subject:

23 kts here with a Yamaha 80, boat loaded.

James

patrick and linda · Posted: Tue Mar 06, 2007 5:02 pm Post subject:

starcrafttom,
just read your post regarding loosing the bottom when on plane.
could your problem be, as a result of air bubbles, caused by mounting the transducer behind a hull srake, or to close to the keel?
i have read installation instructions regarding transducers and they have stated the above as a potential problem.
best regards
pat

patrick and linda · Posted: Tue Mar 06, 2007 5:13 pm Post subject:

obviously, i meant to say strake. sometimes i find, my captains" hat has cut off a tad to much circulation to my nognin".

tpbrady · Posted: Tue Mar 06, 2007 7:25 pm Post subject:

Capt Bill,

I lose the bottom with my Lowrance mainly in water over 300 feet when I am moving greater than 15 mph. It may be disturbance caused by water flow but I suspect some other issue since the shallower the water the faster I can go without losing the bottom.

Tom

Capt'n Bill · Posted: Wed Mar 07, 2007 2:01 pm Post subject: Losing Bottom

Tom,

Have you tried switching fromhigh frequency to low frequency? I believe that 300' may be near the limit for the high frequency mode.

Bill