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Author Topic:   TWO 40hp's on a boat
JohnAz posted 03-25-2002 10:29 PM ET (US)   Profile for JohnAz   Send Email to JohnAz  
does any one have twin 40, thru 55 "s on a boat and what kind of performance do you get
jimp posted 03-26-2002 11:06 AM ET (US)     Profile for jimp  Send Email to jimp     
JohnAz -

Not sure it helps you, but a friend has a 22'ft C-Dory with two Honda 40 4-strokes. He loves it. Not the fastest, but reliable and good on gas. Not really sure of his performance - gas mileage is good. He trolls for salmon with one engine - doesn't smoke at slow speed, and he dooesn't need a 3rd engine for a kicker. In his case, the performance isn't as important as putting fish in the boat.


Denny posted 03-26-2002 02:09 PM ET (US)     Profile for Denny  Send Email to Denny     
Years ago I used a 17-foot Whaler with twin Chrysler 40ís on it. I was in an Advisory Team in the Mekong Delta in Viet Nam. We had a side counsel and a boat that had taken a few hard hits. The twin 40ís worked well and in that situation. On a good day both motors would work at the same time and the top end seemed pretty good.

My experience with that Whaler convinced me that one day I would own one. It took me a while but I own one now and every time I get into it I smile. With the motors that are around today, I would go with one motor.


Bigshot posted 03-26-2002 02:50 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
I would love to drive that thing if you do it. I always wanted to put twin 15's on a 13'. I doubt you will get the manuverability like conventional twins due to they are outboards and mounted real close. Make sure you do not mount too close becasue the one engine can steal the others water.
Salmon Tub posted 03-26-2002 03:17 PM ET (US)     Profile for Salmon Tub  Send Email to Salmon Tub     
I have seen several Montauks in the Bay area with twin 40's (yamaha). Now, spoke to one of the owners, said it was nice and didn't have to worry about if engine fails, what to do, but, his top end was still only low to mid 30's, and no advantage as far as fuel efficiency. Also, the motors where a bit close to each other, and because of the transom design, they were rigged funky, in that they required lag bolts in the lower slots. Not a good alternative. You are better off a single 90. For larger hulls like the 18' and on, I think it would be a no go.
Southern Cross posted 03-27-2002 08:28 AM ET (US)     Profile for Southern Cross  Send Email to Southern Cross     
Big Shot
I run 2 X 25 Hp Yamaha motors on the back of my 13 ft Whaler. Although it may be slightly tail heavy, the extra security and peace of mind afforded by the motors as well as the ability to pull a slalom skier out the water, outweighs the additional weight. I live at the southern point of Africa, also known as the "Cape of Storms".
Bigshot posted 03-27-2002 10:33 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
You better go see a coworker:)

Sounds neat but $$$$. Would love to take a spin on that thing. How do you have them mounted? Can you send Jimh some pics, or me for that matter. I have 1 25hp now....might be something to think about:)

Flipper posted 03-27-2002 08:42 PM ET (US)     Profile for Flipper  Send Email to Flipper     
Southern Cross,I'd love to see some pic's of your rig too.Please send some to me if you get a chance.
witness posted 03-28-2002 02:12 PM ET (US)     Profile for witness  Send Email to witness     
I love to see pictures of any 13 (or 17 for that matter) with twins. It sounds pretty cool!
JohnAz posted 03-28-2002 02:24 PM ET (US)     Profile for JohnAz  Send Email to JohnAz     
I just want to know how fast a pair of 40's thru 55's,,will push what ever you have them on,,,Thanks
FISHNFF posted 03-28-2002 07:46 PM ET (US)     Profile for FISHNFF  Send Email to FISHNFF     
Had a buddy with twin Yamaha Pro 50's on a Montauk. Sounded really nice. Boat seemed more stable than with a single. If I remember correctly, the transon needed to be notched to allow the larger PT/T bracket to fit.
Southern Cross posted 04-08-2002 09:15 AM ET (US)     Profile for Southern Cross  Send Email to Southern Cross     
Bigshot & Flipper
Just returned after the Easter vacation. I will try and borrow a digital camera and send you some pictures. I bought the boat with the twin instalation. The motors were mounted directly on the transom with spacers under the motors.
Alan Hiccock posted 04-11-2002 06:20 PM ET (US)     Profile for Alan Hiccock  Send Email to Alan Hiccock     
I had a 16 Carolina Skiff with a single Evenrude 50 spl, no power tilt/trim.
Those engines are pretty cool. Put 250 problem free hours in it in a season then sold the boat.
Theyre light, 2 cylinders and pretty cheap.
The only 2 things were 2 cyl outboards really shake, also this design really salts up under # 2 cyl. you gotta WD 40 the shit out of it all the time.
I used to sometimes run it unlocked and she'd just softly pop up when if it hit bottom.
I wonder if you could get away with no power trim on a Montuak with twin 50 2 bangers?
If so it might be pretty close to a single 100 in price, cheaper then Japanese motors.
The plus side is you get the saftey of twins with only 4 cyls. total to maintain { good gas milage} and total weight would be under 350 lbs.

ShrimpBurrito posted 04-21-2002 12:57 AM ET (US)     Profile for ShrimpBurrito  Send Email to ShrimpBurrito     

The C-Dory dealers like to put twin 40's and 50's on their balsa-build hulls. The following website at C-Dory compares performance between twin 40's and one 75. This is likely what you're after.

I'd be interested in what you decide. I'm tossing around the idea of getting twins when I upgrade to the 4-stroke.

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