Re-powering a MacM from 70 HP up

[jschrade]

I do notice that when I secure my ETEC 60 and raise it out of the water when sailing, it changes the way the boat sails. It's not just less drag, it rebalances the boat when sailing. Not sure what a bigger engine would do to that balance.

Jim

[vkmaynard]

When my Bayliner was on full plane the cavitation plate was riding on the surface , it was visible.
It might have been the video , but I didn't see a cavitation plate.

There is no doubt you are going very fast , probably going the speed of a planning boat . But I don't think it is actually planning , just moving thru the water , very ,very , fast !

Our cavitation plate is even with the bottom of our X. The bottom of the motor bracket is about 1.5" above the transom. "On plane" the cavitation plate is "dry" on top, clearly above water.

Octaman, given the 115 is the same weight as the 100 (140 is lighter due to bored out metal removed), why would you not opt for the extra HP? The fuel economy will be the same at same speed with the same displacement. Stress is not an issue. Billy has a 140 Suzuki on his X since 2001 with no problems.

Victor

[ROAD Soldier]

Now maybe a 100HP engine would be a good idea for longevity. Since it is the same motor as the 140HP minus not being bored out you could run the 100 HP until it wore out then rebuild it. You could bore it out and then order 140HP Piston Heads, Fuel injectors, and electronic fuel control unit for half the cost of a new motor.

[vkmaynard]

Or you could turbo charge it, run nitro fuel and bump it up to 300 hp for one short pull

[beene]

LOL

You guys kill me

Looking fwd to your results Octaman

G

[ROAD Soldier]

Or you could turbo charge it, run nitro fuel and bump it up to 300 hp for one short pull

If those products were available I would have done that to my 50HP Honda long ago, and watch you as I flew passed you 90HP Suzuki.

[vkmaynard]

Maybe; but you would get fined for littering when when your engine blew up and dumped all the parts overboard

[ROAD Soldier]

Since I did mention Honda I do have to give high marks for their web site. Look at the information for the 90HP outboard. It gives you operating RPMs and where the max HP is produced. Notice there is a difference on this one. Operating RPMs is 5300-6300 while max HP is at 5800 RPMs. So I think max torque is being produced at 5300. This max torque is only an estimate but thanks to the Manufacture Stating the Max HP RPM it would not be hard to figure out in a 1/4mile at all.
http://marine.honda.com/Products/modeldetail/BF90EFI
Now looking at the weight of the 90HP Honda 359lbs with a gear ratio of 233:1with 91.4 CID compared to the Suzuki 90HP 341lbs with gear ratio of 259:1 with 91.7 CID and both run at 5300-6300 RPMs I wonder who would have the fastest 1/4mile time. Looking at weight and gear ratio you would think the Suzuki, but since the operating RPMs are the same it tells me that the Honda has a lot of torque built into the engine at lower RPMs which is typical for Honda anything Car or Boat their valve train design if vastly superior to anyone else. This would be an interesting race indeed.

[ROAD Soldier]

Maybe; but you would get fined for littering when when your engine blew up and dumped all the parts overboard

I get censored here on this sight. I get tickets from the Marine Sheriff's Department as you well know. I used to have to see the 1SG about 3 times a week (for things I supposedly did). I have been shot at. Lived through a helicopter crash. Now you tell me some pi$$-ant Marine Policeman will give me a fine for littering. BRING IT!

[vkmaynard]

I get censored here on this sight. I get tickets from the Marine Sheriff's Department as you well know. I used to have to see the 1SG about 3 times a week (for things I supposedly did). I have been shot at. Lived through a helicopter crash. Now you tell me some pi$$-ant Marine Policeman will give me a fine for littering. BRING IT!

Big words for a wanted no wake marine offender!

[Gypsy]

When my Bayliner was on full plane the cavitation plate was riding on the surface , it was visible.
It might have been the video , but I didn't see a cavitation plate.

There is no doubt you are going very fast , probably going the speed of a planning boat . But I don't think it is actually planning , just moving thru the water , very ,very , fast !

Our cavitation plate is even with the bottom of our X. The bottom of the motor bracket is about 1.5" above the transom. "On plane" the cavitation plate is "dry" on top, clearly above water.

Octaman, given the 115 is the same weight as the 100 (140 is lighter due to bored out metal removed), why would you not opt for the extra HP? The fuel economy will be the same at same speed with the same displacement. Stress is not an issue. Billy has a 140 Suzuki on his X since 2001 with no problems.

Victor

If thats the case , I guess you are planning . If the cavitation plate is on the surface and its even with the bottom of the boat , that means the stern hull bottom has risen and is riding on the surface of the water and thats a true plane !

[Highlander]

I get censored here on this sight."NA THAT CANT BE TRUE" I DO NOT BELEIVE YOU. I get tickets from the Marine Sheriff's Department as you well know. NO KIDDING I used to have to see the 1SG about 3 times a week (for things I supposedly did). YEH RIGHT I have been shot at.WELL WHEN YA WALK INTO A LIQ.STORE WEARING A BROWN PAPER BAG OVER YER HEAD WHAT DA YER EXPECT Lived through a helicopter crash. THAT MUSTA HURT Now you tell me some pi$$-ant Marine Policeman will give me a fine for littering. BRING IT!

YES SIR GIVE ME THIRTY MORE

Big words for a wanted no wake marine offender!

LOL THIS FROM A GUY PUSHING A 50 SHOULDA HAD ONE OF THESE



NO WAKE NO TICKET , & HE'D STILL BE CHASING YA
BUT HE'D GET YA AT THE DOCK
J

[Gypsy]

There would not be any doubt about whether He was truly planning or not !

In fact the discussion would have to change from planning to flying !

[ROAD Soldier]

IT!

LOL THIS FROM A GUY PUSHING A 50 SHOULDA HAD ONE OF THESE



NO WAKE NO TICKET , & HE'D STILL BE CHASING YA
BUT HE'D GET YA AT THE DOCK
J

No highlander if I was going to go with a motor with that much weight and power I would make my own outboard/inboard setup.

[Highlander]

Now that I would like to see !!

J