1986 110 rude; want more hp. how?

[dsujen]

I was told by a boat mechanic that the block from my motor is the same as an 88hp up to I think he said 140hp. He said the only difference is in the carbureation and some kind of exhaust manifold. I like my boat and my motor, but I want it to go about 20 mph faster with out prop changes. It's an 18 ft. cc. that goes 35 mph. With my other prop it goes 40mph but has a hard time gettin on plane. I want it to go around 55 or 60. Can I simply bolt on different carbs to get the power? Any ideas? I was looking to get a 140hp motor, but if I can spend less and get the same results, I would rather keep the motor I have because I know it's a good motor. Plus, I'm a little short on cash so I'm looking for a cheap hp maker.

 

[Barnacle_Bill]

Re: 1986 110 rude; want more hp. how?

It don't work that way. Buy the 140

 

[boobie]

Re: 1986 110 rude; want more hp. how?

Leave a "sleeping dog lie" and buy a bigger mtr.

 

[dazk14]

Re: 1986 110 rude; want more hp. how?

I was told by a boat mechanic that the block from my motor is the same as an 88hp up to I think he said 140hp. He said the only difference is in the carbureation and some kind of exhaust manifold. I like my boat and my motor, but I want it to go about 20 mph faster with out prop changes. It's an 18 ft. cc. that goes 35 mph. With my other prop it goes 40mph but has a hard time gettin on plane. I want it to go around 55 or 60. Can I simply bolt on different carbs to get the power? Any ideas? I was looking to get a 140hp motor, but if I can spend less and get the same results, I would rather keep the motor I have because I know it's a good motor. Plus, I'm a little short on cash so I'm looking for a cheap hp maker.

I feel like we're being baited... Call me a sucka'... Only driving it off a cliff will give 20MPH more.

No carbs or 140's will do it.

Boats are a huge expense. Post on the prop side, listen to Hwiii prop suggestions, and enjoy your great rig.

Go with a bigger boat when your friends and family don't fit, or your back teeth keep rattling whenever you're out on the water.

 

[Bob Gilvary]

Re: 1986 110 rude; want more hp. how?

I was into this discussion a few days ago about a 120 to a 140. I found little changes between the two.

One thing I didn't look into was the sizes of the intake and exhaust ports in the cylinders.

Fact is, if it can't expell what it takes in, you get a dog of an engine.

 

[Bob_VT]

Re: 1986 110 rude; want more hp. how?

Wanting to go 55-60 will not happen........ even if it was a true 140.

Save your money (and the aggravation involved) and keep your eyes open for the largest HP motor your boat will allow. If more speed than that is desired....... get an entirely different hull.

55 from a Bass boat hull with a 140 is just about optimistically at the top of the spectrum

 

[metriccrescentwrench]

Re: 1986 110 rude; want more hp. how?

A very rough mathematical correlation is that top speed increases in proportion to the square of power. Now this is by no means exact, but it's at least in the ballpark for estimating what's going to be feasible. In your case you know that with 110 HP your boat can go 40 mph (with your "speed prop"). To go 55 it will be:

(55 / 40) ^2 * 110 which comes out to around 208 HP needed to go 55. (It's actually going to be a little worse than that because the theoretical 208 HP engine will be heavier than your 110).

To find best speed with 140 HP:

140 / 110 = (S / 40) ^2

When solved for S it comes out to about 45 mph using 140 HP.


Here's a link to an article about estimating speed vs. horsepower, with a neat graph (notice that the graph uses knots instead of mph) for estimating speed.

http://youboat.net/boatPower3.aspx

Just for fun I plugged your information into that chart, and came out with about 44 mph for an increase to 140 HP.

 

[ChrisAG]

Re: 1986 110 rude; want more hp. how?

I was told by a boat mechanic that the block from my motor is the same as an 88hp up to I think he said 140hp.

That 140 your mechanic was talking about was the older crank-rated model. Since your 110 is a 1986 it is prop rated, so not all that far off in real power from the 140. I think the maximum PROP rated 1.6 L cross flow were only 115hp. The 120 and 140hp from the mid-1980's were loop-charged 2.0 L, much more powerful, with no interchangable engine parts with yours.

 

[Dhadley]

Re: 1986 110 rude; want more hp. how?

All of the modern V4 crossflows used basically the same block from a casting standpoint. The 140 crossflow was 140 at the crank. In 1985 it was propshaft rated and called a 115. Same block, same port timing, same exhaust, same everything. That same 115 (propshaft rated) was called a 110 and a 112.

You can take a 85 or 90 hp block and convert it to a 140/115/110/112. We've done it hunderds of times. Open the ports to the 140 type specs and add the "tuned" exhaust.

Are you going to go from 40 mph to 55 mph with basically the same stock V4 crossflow motor? No. You might - might - get halfway with a V4 looper but that's a whole different ball game.

I will tell you this - there is a lot of untapped power in the crossflow intake manifold.