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Member
Posts: 73
Location: NW Illinois | Can anyone tell me if there is a feasible way to increase a boat's HP rating. I have in 19'6" boat rated for 175 HP. It is currently equipped with a 150 Merc, but I have a chance to get a great deal on a 200 Yammy HPDI. Wondering if there was a way to get the rating increased. I see a lot of boats with no better transoms that are carrying 225's.
Anyone have any hints?
John |
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| I your merc is a 150 efi simply changing the reeds to Byson , porting the exhaust and changing the tuner and line will get you over 200 hp If you are interested contact GPI in Avon Minnesota it is an inexpensive upgrade . |
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| I your merc is a 150 efi simply changing the reeds to Byson , porting the exhaust and changing the tuner and liner will get you over 200 hp If you are interested contact GPI in Avon Minnesota it is an inexpensive upgrade . |
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Member
Posts: 73
Location: NW Illinois | Thanks Craig, I do like that idea better than shelling out the bucks for a new motor. Will it effect the life span of the motor?
John |
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| I ran "upgraded "one like that on three boats for 10 years the only mechanical problem I ever had was a power trim motor burned out and that had nothing to do with the engine mods, I sold the motor this summer because I am going to a larger Boat . It still had compression over 135 and would idle in gear at 550 Randy at GPI does good work and can help you out with set up , props etc .His number is 320-356-9068 |
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Member
Posts: 190
Location: Annandale, MN | Rooster...I'd 2nd Craig's recommendation on using Randy Pearson in Avon. He worked on a boat for me a few years ago. The boat was doing a little over 45 mph before I gave it to him and after he was done it would hit a little over 50 mph. He changed the motor height and customized a SS prop. It cost me about $250. Nav |
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| We used to do quite a few "upgrades" to Yamahas via, Hyro-Tech , but as an engine dealer, we had to quit due to EPA rules.
Heads, tuners, reeds, bigger carbs, etc. Now all we are allowed to do is sell the parts. We honestly did not see problems with those engines we "modified" in terms of endurance. In most cases we were simply taking the same block that was used for 150 thru 225 and putting some more ponies into a guy's 150 or 175. Same as the factory would have, in many cases.
It is an option, but of course, when you buy a new engine the warranty is more lengthy. |
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| the horsepower rating is set by the coast guard. I dont think you can get them to change it very easily even though your boat may be able to handle a 200hp |
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Location: Rhinelander | The formula used by the USCG for remote steering boats is:
Centerline Length in feet X width at the transom static float plane in feet using hundreths as fractions of a foot times 2 minus 90.
Tiller boats are calculated Length X Width X .8 minus 25.
Round up to the nearest multiple of 5. If the rating, for example, is 121, it will round up to 125. If the rating is 126, round up to 130. |
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Member
Posts: 73
Location: NW Illinois | What is the transom static float plane? This boat has a 100" beam, and is one of the widest throughout I have ever seen for a 19' aluminum boat. |
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| Rooster-
Kinda like weight carrying floatability..
Beam doesn't mean much ---if it is achieved mostly above the height of the transom... when talking weight carrying ability. The width down at the chines will have more to do with it than gunnel width.(The part that must get displaced when floating a load before water starts running into the boat). |
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