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  #1  
Old 11-07-2013, 12:20 AM
boatervalpo boatervalpo is offline
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Default 1972 CC Repower

1972 20ft CC....Currently have the original 125 rude, yes from 1972. The boat is underway with a overhaul to get it back to original condition, only minor mods. It want a newer motor so I can actual enjoy her. So that being said, I'm keeping the original transom to accommodate the 20" shaft. Any recommendations on power, stroke, make?
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  #2  
Old 11-07-2013, 06:49 AM
CHANCE1234 CHANCE1234 is offline
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90-115 hp. 2 stroke and keep the engine as close to 300 lbs max as possible.
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  #3  
Old 11-07-2013, 09:24 PM
Bushwacker Bushwacker is offline
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Amen to what Chance said. Reason is these hulls are extremely efficient, don't need a lot of power, and will plane at about 12 mph with a 300 lb motor! Moesly designed the 19/20' hull in the mid-60's for the lightweight motors available at the time, which didn't exceed more than about 110 hp and 300 lbs. If you hang a 500 lb 4-stroke on it, you will screw up the balance of the boat, raise it's min planing speed to the low 20's, and end up with a worse ride and handling than if you stay with the original configuration. Adding a bracket will make the situation even worse and require many other changes to get an acceptable ride and low speed planing performance.
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  #4  
Old 11-07-2013, 10:10 PM
boatervalpo boatervalpo is offline
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Would a 125hp at 400lbs cause much issue / change of ride?

Quote:
Originally Posted by Bushwacker View Post
Amen to what Chance said. Reason is these hulls are extremely efficient, don't need a lot of power, and will plane at about 12 mph with a 300 lb motor! Moesly designed the 19/20' hull in the mid-60's for the lightweight motors available at the time, which didn't exceed more than about 110 hp and 300 lbs. If you hang a 500 lb 4-stroke on it, you will screw up the balance of the boat, raise it's min planing speed to the low 20's, and end up with a worse ride and handling than if you stay with the original configuration. Adding a bracket will make the situation even worse and require many other changes to get an acceptable ride and low speed planing performance.
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  #5  
Old 11-07-2013, 10:38 PM
Bushwacker Bushwacker is offline
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Lighter is definitely better, and 400 lbs seems to be about the upper limit; a lot of guys are running the older V-6 Mercs that weigh about that. If I was making a 10 hr run to the Abaco's, I'd prefer the old 300 lb V-4 I used to have! The carb'd 60 degree 150/175 V-6 OMC's weigh about 375 and provide plenty of power. The 115/130 V-4 E-TEC's also weigh about 375. You can offset some of the weight effect by moving batteries and the console forward and by running a 4B stern lifting prop and a Doelfin or equivalent on the motor, but that will reduce WOT speed.
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  #6  
Old 11-08-2013, 11:13 AM
CHANCE1234 CHANCE1234 is offline
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I have a 72 CC with a yamaha 2 stoke 115 on the back. i replaced the original 40 gal under console tank with a new 49 gall under the deck almost all the way forward to the raised casting platfrom and placed a single 27 series battery under the console. I plane at about 13 knts with a top speed of 32 kts and a easy cruise at 4k RPM at 22 knts. all this and i haven't played with the prop. currently it has a 3 blade aluminum 15 pitch which maxes at 5700 RPM trimmed up. i can do 22 knts cruise all day in 2-3 chop and not feel much at all. on nice days i'll run it around 27 knts but unless its flat out which hardly ever happens i see no need to do 30 plus. lets face it, in 3 footers not many similar size or larger CC boats are going over 20 knots. keep her light and you'll never regret it...
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  #7  
Old 11-10-2013, 10:52 AM
mnwnvc mnwnvc is offline
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I love my Merc Opti DFI 115 on my 20. Boat feels very light and responsive and has good top end and fuel economy. I think it weighs 380.
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  #8  
Old 11-11-2013, 08:53 AM
Fr. Frank Fr. Frank is offline
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I think I'd probably go with the 90 Etec if it were my choice. It produces 112 hp at the power-head and delivers about 104-105 hp at the prop.(more than the 1972 115 which only averaged 110 and 102!)

IT ONLY WEIGHS 320 LBS!

Test on a 19' Triumph CC got 6.6 mpg at 23 kts, with WOT of 34 kts (38mph) That's impressive!
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  #9  
Old 11-11-2013, 10:07 PM
McGillicuddy McGillicuddy is offline
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I think the zuke 90 and the e-tec 90are the superior options in the weight/power arena.

I think bitsamonkey has a late model DF90A zuke and his numbers were impressive, albeit on an 18. IIRC he was getting 37 mph WOT and showed 6.7 mpg @ a 27mph cruise. Its about 25 lbs heavier the the e-tec 90, but the gear ratio is like 2.59 and allows for swingin' a burly blade.

That being said I think that e-tec 90 would be sweet too. The economy of the e-tecs at hull speed (no wake, trolling, etc.) is amazing. I have no idea on their respective torque curves.

I think either would be very close in power to older, lighter 115 hp 2-strokes.

If I went 115, I think the e-tec would be my only consideration. Bushwacker's 150 was freaky silent at speed. I presume the 115 abides. Dude. That knocks the Optis an Tohatsus aside for me. The nominal extra weight of the Yammies, 4-s Mercs and Zukes is the dealbreaker for me. Now if I got a steal of a deal - I'd start moving stuff forward.
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  #10  
Old 11-11-2013, 10:19 PM
FishStretcher FishStretcher is offline
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I wouldn't put anything over 400 lb back there, including kicker. I am at 415 with kicker. I have a 20" four stroke Yamaha F100. They are F90s now. 367 lb dry. I like the motor, but EFI would be nicer.
I have batteries and tank forward and no leaning post, so balance is ok, but only just. I am thinking of ditching the kicker because of the weight.

Even with everything forward it JUST self bails at the dock.
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