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Author Topic:   130 SPORT: Increase to 60-HP

CaMoFroG posted 07-18-2007 01:41 PM ET (US)
[This article has been re-written to conform with our minimal style requirements: capitalization of the personal pronoun and capitalization of proper names--jimh]
I own a 2006 130 SPORT with the 40-HP Mercury four-stroke. I love it. It is a great little boat. With nothin' but me in it I can hit 5,500-RPM [and over] 35-MPH. But if I get four adults in it, it won't even plane off, and seems the only way I can pull a skier or knee boarder is to only have a bare minimum (2) lightweights on board (wife and daughter maybe 200-lbs between em both, in order to pull me 195lbs and nothin' else in the boat). It works great for running around with my small family there are just times I wish it had a little more ooomph.
It is pretty much impossible to find a 150 SPORT around here (Montana) otherwise I probably would have went that route in the first place.
I am considering putting a 60-HP Mercury four-stroke on it. NOT the Bigfoot version. The 40-HP Mercury weighs 216 lbs; the 60-HP Mercury weighs 248 lbs. The boat is rated for the 40 and says engine weight of 225 lbs, but 23 lbs more difference--come on, that is not that substantial. 'm not sure what prop it is. It is stock, what ever came from manufacturer.
Has anyone else [installed a 60-HP motor on a 130 SPORT]? What kind of speeds? Speculations? Is it worth it ? Would it make a worthwhile difference? Any suggestions?
I know there are other implications about overpowering a boat but I am not too worried about that. My insurance company is flexible and I really only use the boat on lakes around here. I also wouldn't mind putting a 40-HP cowl on it just for piece of mind or changing the numbers)
I think if you use the formula [from the Federal Code of Regulations] that the boat should be able to handle [60-HP] just fine. It is a matter of the the manufacturer happen to specify it lower.
Thanks for any input.
Tadpole posted 07-18-2007 02:29 PM ET (US)
Something, or maybe a few things…aren’t right. I can plane 4 adults with my 30 (2 stroke). On the other hand, your motor is 100 lbs. heavier, and some complain about less than ideal midrange power in the 4 stroke.
Is the hull dry? If you’re turning 5500 by yourself, your pitch is probably okay – though you may be able to drop just a little pitch. Do you have tilt/trim, and if so, are you tucking all the way in to get on plane? Weight distribution is everything on these boats. A “dolphin” or equivalent will help, but mine just kisses the water at planning speed – to avoid drag.
You shouldn’t need to buy a 60 to plane 4 adults – even with a tube in tow.
Tohsgib posted 07-18-2007 02:52 PM ET (US)
Ditto...40 should scoot with 4 people. I would check pitch and try another prop. I drove one and with 3 of us in it she flew.
CaMoFroG posted 07-18-2007 04:24 PM ET (US)
[This article has been re-written to conform with our minimal style requirements: capitalization of the personal pronoun, capitalization of proper names, proper use of the apostrophe; proper spelling of key words.--jimh]
I actually have a hydro foil I just put on last week, and I really like it. If it is only me in the boat, it planes at about just less than 3,000-RPM and makes it much easier to control the porpoising
My boat has power trim, and I have tried several settings. I think I have a 14-inch pitch prop but I would need to double check that. We probably had about 700-lbs of crew on there with full gas and could barely get 3,250-RPM and couldn't plane off at full throttle. Distributed evenly we also tried triming up and down and moving around. Maybe it is just too much weight.
The other problem: I had three adults who weight a total of about 450-lbs and could not plane off while trying to pull me (195-lbs) on a kneeboard, so, needless to say, couldn't get fast enough for me to even stay up or get on.
Thanks
Tohsgib posted 07-19-2007 12:50 PM ET (US)
Can't get blood from a stone.
jimh posted 07-19-2007 07:58 PM ET (US)
A boat's speed is always in inverse proportion to weight, so there is no surprise that when weight is increased that speed and performance decrease. In a small boat the weight of the crew becomes a very significant portion of the total weight, and there is absolutely no surprise that a small boat that performs well with two people aboard may not perform nearly as well when you double the number of people to four. This is simply because the weight has very significantly increased.
On a larger boat the total difference in weight when two more people are added is a much smaller percentage change in the total weight, and so the percentage change in speed and performance is correspondingly smaller.
If you increase the horsepower by 50-percent it will make quite a difference in speed and performance.
The question of powering a boat above its rated power is answered in the FAQ.
CaMoFroG posted 07-20-2007 09:30 AM ET (US)
[This article has been re-written to conform with our minimal style requirements: capitalization of the personal pronoun, capitalization of proper names, proper use of the apostrophe; proper spelling of key words.--jimh]
Thanks guys. I figured out I have a 10.25-inch diameter and 14-inch pitch aluminum propeller. I am going to try a 13-inch-pitch propeller and see what difference that makes before I swap motors.
CaMoFroG posted 07-31-2007 10:08 AM ET (US)
[This article has been re-written to conform with our minimal style requirements: capitalization of the personal pronoun, capitalization of proper names, proper use of the apostrophe; proper spelling of key words.--jimh]
I went ahead and put a stainless steel four-blade Mercury Trophy Sport 10.5-inch diameter and 12-inch pitch propeller on this baby. WOW what a difference. Hole shot is incredible. I can finally pull an adult skier (although only with the minimum two people in the boat). My engine speed at wide open throttle doesn't go over 5,650-RPM and top speed is still about 30-MPH. I guess if I want to haul more weight though I'm still going to have to go for the 60-HP motor.
CaMoFroG posted 08-06-2007 12:46 PM ET (US)
[This article has been re-written to conform with our minimal style requirements: capitalization of the personal pronoun, capitalization of proper names, proper use of the apostrophe; proper spelling of key words.--jimh]
Just another update tried some more tests.
I would recommend this stainless steel four-blade Mercury Trophy Sport 10.5-inch diameter and 12-inch pitch propeller to anyone who has a 130 Sport with a 40-HP Mercury four-stroke.
It is incredible, exactly what I would expect this boat to be able to do.
We were still able to come up on plane with nearly 900-lbs in the boat and hit almost 5,000-RPM, yet it does not over-rev (max 5,700-RPM) when it is just me
I towed a skier with nearly 500-lbs in the boat (three people and stuff)
For now I think I'm happy with it and won't be getting the 60-HP.
theo posted 08-07-2007 07:18 PM ET (US)
CaMoFroG,
I almost never post here but I listen in once in awhile. I had a friend in high school with a 60 Merc on a 13-foto Whaler. It was pretty fast, maybe high 40's, and lots of fun. Someone told me once he flipped it. Could be.
I have a 60 Merc on my 15 CC and it's pretty fun with just me and a couple gallons of gas, but it just doesn't give the same rush that you get when you're worried about flipping!
Mostly I was just wondering where you live. I'm in Missoula. A couple hours to Flathead and all day to Puget Sound from here.
CaMoFroG posted 08-27-2007 04:39 PM ET (US)
I am up here in the flathead, Columbia Falls Actually.
I would love to take my boat over to the Pacific Coast, but if I did that I would want to take my camper too and I don't think Washington lets you pull triples...

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Author	Topic: 130 SPORT: Increase to 60-HP
CaMoFroG	posted 07-18-2007 01:41 PM ET (US) [This article has been re-written to conform with our minimal style requirements: capitalization of the personal pronoun and capitalization of proper names--jimh] I own a 2006 130 SPORT with the 40-HP Mercury four-stroke. I love it. It is a great little boat. With nothin' but me in it I can hit 5,500-RPM [and over] 35-MPH. But if I get four adults in it, it won't even plane off, and seems the only way I can pull a skier or knee boarder is to only have a bare minimum (2) lightweights on board (wife and daughter maybe 200-lbs between em both, in order to pull me 195lbs and nothin' else in the boat). It works great for running around with my small family there are just times I wish it had a little more ooomph. It is pretty much impossible to find a 150 SPORT around here (Montana) otherwise I probably would have went that route in the first place. I am considering putting a 60-HP Mercury four-stroke on it. NOT the Bigfoot version. The 40-HP Mercury weighs 216 lbs; the 60-HP Mercury weighs 248 lbs. The boat is rated for the 40 and says engine weight of 225 lbs, but 23 lbs more difference--come on, that is not that substantial. 'm not sure what prop it is. It is stock, what ever came from manufacturer. Has anyone else [installed a 60-HP motor on a 130 SPORT]? What kind of speeds? Speculations? Is it worth it ? Would it make a worthwhile difference? Any suggestions? I know there are other implications about overpowering a boat but I am not too worried about that. My insurance company is flexible and I really only use the boat on lakes around here. I also wouldn't mind putting a 40-HP cowl on it just for piece of mind or changing the numbers) I think if you use the formula [from the Federal Code of Regulations] that the boat should be able to handle [60-HP] just fine. It is a matter of the the manufacturer happen to specify it lower. Thanks for any input.
Tadpole	posted 07-18-2007 02:29 PM ET (US) Something, or maybe a few things…aren’t right. I can plane 4 adults with my 30 (2 stroke). On the other hand, your motor is 100 lbs. heavier, and some complain about less than ideal midrange power in the 4 stroke. Is the hull dry? If you’re turning 5500 by yourself, your pitch is probably okay – though you may be able to drop just a little pitch. Do you have tilt/trim, and if so, are you tucking all the way in to get on plane? Weight distribution is everything on these boats. A “dolphin” or equivalent will help, but mine just kisses the water at planning speed – to avoid drag. You shouldn’t need to buy a 60 to plane 4 adults – even with a tube in tow.
Tohsgib	posted 07-18-2007 02:52 PM ET (US) Ditto...40 should scoot with 4 people. I would check pitch and try another prop. I drove one and with 3 of us in it she flew.
CaMoFroG	posted 07-18-2007 04:24 PM ET (US) [This article has been re-written to conform with our minimal style requirements: capitalization of the personal pronoun, capitalization of proper names, proper use of the apostrophe; proper spelling of key words.--jimh] I actually have a hydro foil I just put on last week, and I really like it. If it is only me in the boat, it planes at about just less than 3,000-RPM and makes it much easier to control the porpoising My boat has power trim, and I have tried several settings. I think I have a 14-inch pitch prop but I would need to double check that. We probably had about 700-lbs of crew on there with full gas and could barely get 3,250-RPM and couldn't plane off at full throttle. Distributed evenly we also tried triming up and down and moving around. Maybe it is just too much weight. The other problem: I had three adults who weight a total of about 450-lbs and could not plane off while trying to pull me (195-lbs) on a kneeboard, so, needless to say, couldn't get fast enough for me to even stay up or get on. Thanks
Tohsgib	posted 07-19-2007 12:50 PM ET (US) Can't get blood from a stone.
jimh	posted 07-19-2007 07:58 PM ET (US) A boat's speed is always in inverse proportion to weight, so there is no surprise that when weight is increased that speed and performance decrease. In a small boat the weight of the crew becomes a very significant portion of the total weight, and there is absolutely no surprise that a small boat that performs well with two people aboard may not perform nearly as well when you double the number of people to four. This is simply because the weight has very significantly increased. On a larger boat the total difference in weight when two more people are added is a much smaller percentage change in the total weight, and so the percentage change in speed and performance is correspondingly smaller. If you increase the horsepower by 50-percent it will make quite a difference in speed and performance. The question of powering a boat above its rated power is answered in the FAQ.
CaMoFroG	posted 07-20-2007 09:30 AM ET (US) [This article has been re-written to conform with our minimal style requirements: capitalization of the personal pronoun, capitalization of proper names, proper use of the apostrophe; proper spelling of key words.--jimh] Thanks guys. I figured out I have a 10.25-inch diameter and 14-inch pitch aluminum propeller. I am going to try a 13-inch-pitch propeller and see what difference that makes before I swap motors.
CaMoFroG	posted 07-31-2007 10:08 AM ET (US) [This article has been re-written to conform with our minimal style requirements: capitalization of the personal pronoun, capitalization of proper names, proper use of the apostrophe; proper spelling of key words.--jimh] I went ahead and put a stainless steel four-blade Mercury Trophy Sport 10.5-inch diameter and 12-inch pitch propeller on this baby. WOW what a difference. Hole shot is incredible. I can finally pull an adult skier (although only with the minimum two people in the boat). My engine speed at wide open throttle doesn't go over 5,650-RPM and top speed is still about 30-MPH. I guess if I want to haul more weight though I'm still going to have to go for the 60-HP motor.
CaMoFroG	posted 08-06-2007 12:46 PM ET (US) [This article has been re-written to conform with our minimal style requirements: capitalization of the personal pronoun, capitalization of proper names, proper use of the apostrophe; proper spelling of key words.--jimh] Just another update tried some more tests. I would recommend this stainless steel four-blade Mercury Trophy Sport 10.5-inch diameter and 12-inch pitch propeller to anyone who has a 130 Sport with a 40-HP Mercury four-stroke. It is incredible, exactly what I would expect this boat to be able to do. We were still able to come up on plane with nearly 900-lbs in the boat and hit almost 5,000-RPM, yet it does not over-rev (max 5,700-RPM) when it is just me I towed a skier with nearly 500-lbs in the boat (three people and stuff) For now I think I'm happy with it and won't be getting the 60-HP.
theo	posted 08-07-2007 07:18 PM ET (US) CaMoFroG, I almost never post here but I listen in once in awhile. I had a friend in high school with a 60 Merc on a 13-foto Whaler. It was pretty fast, maybe high 40's, and lots of fun. Someone told me once he flipped it. Could be. I have a 60 Merc on my 15 CC and it's pretty fun with just me and a couple gallons of gas, but it just doesn't give the same rush that you get when you're worried about flipping! Mostly I was just wondering where you live. I'm in Missoula. A couple hours to Flathead and all day to Puget Sound from here.
CaMoFroG	posted 08-27-2007 04:39 PM ET (US) I am up here in the flathead, Columbia Falls Actually. I would love to take my boat over to the Pacific Coast, but if I did that I would want to take my camper too and I don't think Washington lets you pull triples...