Hot Rodding the Honda BF 150

[warcry]

Does it effect the engine's warranty???... Dan

Pretty sure mods...especially internal...is an automatic voiding.

[shfishinsticks]

Interested also. The 135 is the same block as the 150.

My motor is old enough to not have to worry about a warranty being voided!

[billnorman1]

Horsepower going up generally means torque doesn't always go up equally BUT here's a Honda 4 cylinder that turns 10,000 RPM plus delivering 500 Horsepower.
It could make your boat fast (er).

Blown or turbo'd Hondas can make 1500HP plus.

[acesover]

How what would effect your insurance...the 150 cowl and stickers...

Until you make a claim if you, God forbid, have an incident going fast.

[smalljawguy]

Until you make a claim if you, God forbid, have an incident going fast.

Yep. If there is any reason to look at the motor, and they find out it's been modded like that, don't be surprised when the insurance company refuses to pay the claim. It's a common term in the insurance industry called MMR (Material Misrepresentation)

[billnorman1]

Until you make a claim if you, God forbid, have an incident going fast.

Just claim actual horsepower if the form asks when you get the policy. I doubt State Farm will renege on my truck policy if I put a performance cam in the motor.

[smalljawguy]

Just claim actual horsepower if the form asks when you get the policy. I doubt State Farm will renege on my truck policy if I put a performance cam in the motor.

Cam in your truck motor is very different than modding a motor to the point that it exceeds the maximum horsepower for a boat.

[bpalmer]

Won’t work...... they will gain some but automobiles have transmissions and boats have continuous drag. Won’t work...

[Dando]

Article ends with the beginning of mods to the bottom end, with no testing results. Street Honda car motors are reputed to develop 500 H P without a blower, it would be kind of unusual to be passed by a Honda 150 while flat out with a 300 HP Mercury.

That won't happen.

[K-DAWG]

Pretty sure this mod falls into the same catagory as if you were doing it to your new Mustang GT or Camaro. Most people who do this type of upgrade arent really worried about a warranty. Just my 2 cent......................

[Dando]

Pretty sure this mod falls into the same catagory as if you were doing it to your new Mustang GT or Camaro. Most people who do this type of upgrade arent really worried about a warranty. Just my 2 cent......................

[Bamaman]

Article ends with the beginning of mods to the bottom end, with no testing results. Street Honda car motors are reputed to develop 500 H P without a blower, it would be kind of unusual to be passed by a Honda 150 while flat out with a 300 HP Mercury.

I would never believe any 500 hp w/o turbocharging or a blower. I have a Civic SI, and it's a strange engine--very little torque but high reving. The VVT is where it gets its horsepower, and it's not easy to make modifications to that system. I really think the engines are not that great for marine applications where torque is king.

[Steve@BMS]

Bob's got to do our part in this, we did a low water pickup nose cone :) Can't wait to see final results!

[Riccochet]

I'd bet they get it up to 350-400 HP, easily. No turbo or supercharger needed. There are plenty of K24's on the road today running those power levels N/A. And since the Honda 150 is K24 based I can't imagine it'll be all that different. I'd imagine they'll be using standalone fuel management with Hondata ECU. You can get super aggressive with VTEC on a stock motor to produce some ridiculous power numbers.

Which makes me wonder. Do the Honda outboard's use VTEC?

[shfishinsticks]

Do the Honda outboard's use VTEC?

Yes, on the 135 and up.

[berudd]

As has been said many times, and outboard motor and an car engine are not used the same. To get big HP from a little engine, you have to spin it fast. That's OK in a car where you don't run flat out very often. And if you do, you expect it to wear our faster. As we know, outboards run in the upper RPM range most of the time. They might get to 200HP or so but if the go much faster and start spinning around 10K I would not expect it to last long with out frequent rebuild. Plus, there is the whole no transmission thing. You can get by with an engine that makes all top end power in a car because you can shift up through 6 gears to use it. While I think there are some 2 speed transmission for boats, that wouldn't seem like a good fit here consider weight seems to be a big issue.

[Wave to Wave]

Cam in your truck motor is very different than modding a motor to the point that it exceeds the maximum horsepower for a boat.

Presumably you would run it on a boat rated for that power. It's meant to be a good replacement for the older 225 Promax's and 2.5 280s. Light, high revving 225+ HP.

This was going to be the test boat for the Honda, but we will probably use something different. The Allison will have a modded Mercury 150 Four Stroke.

[bullet20vee]

Will this modded 4 stroke turn 7500+ RPM's? If you turn a gear case with x gear ratio to a given rpm with a given prop slip percentage, you have a top speed. If you have 500 hp, but can only turn 6500 rpm's, can you go faster than a motor turning 7500 rpm's with the same gearcase with the same slip? Serious question here, you have piqued my interest with a cool looking build.

[smalljawguy]

Presumably you would run it on a boat rated for that power. It's meant to be a good replacement for the older 225 Promax's and 2.5 280s. Light, high revving 225+ HP.

This was going to be the test boat for the Honda, but we will probably use something different. The Allison will have a modded Mercury 150 Four Stroke.

Sorry Wave, I wasn't suggesting that you would do that. Was responding to someone saying "just don't tell your insurance company".

[Wave to Wave]

That won't happen.

Could easily happen, it depends on the boat.