Would my 90hp 2 stroke push 22 footer?

[KAIZEN_USA]

hI GENTS I JUST GOT THESE DEAL AND I PURCHASED THIS 22 FOOT 1970 BOAT HAS AN INBOARD V8 WITH STERN DRIVE, HOWEVER ENGINE IS NOT RUNNING ,, BUT I JUST PURCHASED THIS 1993 YAMAHA C85 2 STROKE,I'M THINKING OF REMOVING THE INBOARD AND REFIX THE TRANSOM (COVER THE HOLE) AND INSTALLING MY 90 HP OUTBOARD TO IT. ANY SUGGESTIONS OR IDEAS WOULD IT ACTUALLY PUSH TO BOAT AROUND IN THE BAY?? FLORIDA? I JUST DON'T HAVE THE BUDGET TO BUY BIGGER HP SO I NEED SOME ADVISE PLEASE.. THANKS.

 

[Philster]

Re: Would my 90hp 2 stroke push 22 footer?

No way. It won't get it on plane.

 

[drrpm]

Re: Would my 90hp 2 stroke push 22 footer?

That sounds like a recipe for disaster. You need to fix or replace the inboard engine. That boat is not designed to be an outboard.
If the outboard is good, my advice would be to find an appropriate boat for it and sell the one with the nonfunctional engine.

 

[robert graham]

Re: Would my 90hp 2 stroke push 22 footer?

After you strip out that engine, outdrive, motor cover, under deck gas tanks, etc. that boat should be light enough for that 90HP to push it fine, and you'll gain a lot of space in the back of boat for gear and fishing stuff. I have a 90HP on my 18' boat and it's got way more power than I really need just for fishing and cruising around. I see lots of boats down on the gulf coast that's 22' with a 90HP motor used for fishing, clamming, utility, and they'll run 25MPH easy! Go for it!

 

[Philster]

Re: Would my 90hp 2 stroke push 22 footer?

A 22' Skiff? Maybe. A V hull, as pictured? I guess the OP has to be willing to clearly state the objectives here. You can utility trawl on any power. Oars will propel the boat. Tossing in some line about 'way more power than I need' in reference to an 18' boat, the type of which is unknown, is not helpful.

22' of V hull w/ 90 HP? I don't see it working out unless the OP is in it to putter from net to net, pot to pot.

 

[Home Cookin']

Re: Would my 90hp 2 stroke push 22 footer?

Nope. You'd have to strip out the consoles, etc. to make it work as a work boat.

Think long and hard about that boat as a project if you are short on funds, regardless of how little you paid for it. The purchase price was just the down payment.

 

[The Famous Grouse]

Re: Would my 90hp 2 stroke push 22 footer?

IMO, forget it.

Sterndrive to outboard conversions done to a safe, high-quality standard are never as easy as the average boater thinks. There's a reason why so many of these conversions involve installation of a pre or custom-fabbed transom extension/outboad bracket and the cost is significant.

Grouse

 

[Texasmark]

Re: Would my 90hp 2 stroke push 22 footer?

You asked the question: "Would it push it?". Yes!

 

[scoutabout]

Re: Would my 90hp 2 stroke push 22 footer?

I'm going to go with no as well. It's always nice when the stars align and stuff you have can be made to work but just from a power perspective I think you'd be disappointed.

My 90 Yamaha on our 17 foot Scout will loaf along at 25-30 mph at cruise and WOT will hit (gasp) all of 40 mph. That's on a hull that weighs only 1200 pounds and has a fairly flat bottom. To push your boat even at those relatively modest speeds I'm betting you are going to need more like 150 hp on tap.

Now, if you don't care about planing much then you are left with the challenge of the refit. That job I've heard is a fairly big one.

 

[KAIZEN_USA]

Re: Would my 90hp 2 stroke push 22 footer?

Allright, i'm gonna wait until next summer to do that. well i have another boat that is 1968 which i'm in a process of converting it into center console. did buffed out the out and painted stripped off the floor and now i'm in a process of installing a fresh deck with glassed plywood . this boat is 17 foot i guess i'm just gonna put the motor to this one until saving some money for the other boat..)) thanks guys. i really appreciate it.

 

[H20Rat]

Re: Would my 90hp 2 stroke push 22 footer?

I/O's just can't be converted to outboards. It isn't that easy, take a look at this thread for an example of what happens.

http://forums.iboats.com/showthread.php?t=517453

 

[Texasmark]

Re: Would my 90hp 2 stroke push 22 footer?

Seems memories are short. Back when the OMC "Fat 50" was introduced it was advertised on 24-25 foot cabin cruisers with a full family aboard. Advertisement pictures showed these engines putting these craft on plane and doing 20 or so mph (at sea level). That was 50 hp and powerhead rated....so in today's terms, per the Xperts on here that's a reduction of 10-15% vs today's prop rated engines....So we are talking about basically a 40 hp engine pushing a 24-25' cabin cruiser with a family aboard over planing speed at 20-25 mph.

In answering the question again.......gimme a break....90 HP.......get a grip. It'll do it.

Mark

 

[Handyman1]

Re: Would my 90hp 2 stroke push 22 footer?

Hi it all comes down to what size prop you going to use on the motor you want to plane 13p-15p prop might give you the power you need for that boat. Good luck

 

[Texasmark]

Re: Would my 90hp 2 stroke push 22 footer?

Hi it all comes down to what size prop you going to use on the motor you want to plane 13p-15p prop might give you the power you need for that boat. Good luck

Mentioning prop, pull up some of those old sales brochures and yes, look at the props on the Fat 50's. Certainly not much pitch, but that's what it took, as handyman said.

Mark

 

[25thmustang]

Re: Would my 90hp 2 stroke push 22 footer?

Seems memories are short. Back when the OMC "Fat 50" was introduced it was advertised on 24-25 foot cabin cruisers with a full family aboard. Advertisement pictures showed these engines putting these craft on plane and doing 20 or so mph (at sea level). That was 50 hp and powerhead rated....so in today's terms, per the Xperts on here that's a reduction of 10-15% vs today's prop rated engines....So we are talking about basically a 40 hp engine pushing a 24-25' cabin cruiser with a family aboard over planing speed at 20-25 mph.

In answering the question again.......gimme a break....90 HP.......get a grip. It'll do it.

Mark

Do you have any of these advertisement photos? Anything less than a near 200 hp 6 cylinder would have a tough time getting a 24-25 express cruiser with a full load on plane.

 

[sschefer]

Re: Would my 90hp 2 stroke push 22 footer?

Will the 90 push that boat? It will but it probably won't be much to talk about.

Regarding conversion and why so many have already told you NO. The boat was engineered by a Marine Architect to be a I/O and it's construction is such that the boat will perform best in that configuration. Several things are different in the construction of the hull and the center of balance for the boat is calculated for the weight and location of the average 1000 lb I/O. Several have done conversions without regard for this and the result is always somewhat different than expected.

I'll jump on the band wagon at this point and suggest that you don't do a conversion either.

Best of luck in whatever your decision is.

 

[Maclin]

Re: Would my 90hp 2 stroke push 22 footer?

The boat in the pics looks like it was a cuddy cabin with some kind of bridge until someone cut the top off. Nader would call it a Corvair, "Unsafe at any speed".

 

[scoutabout]

Re: Would my 90hp 2 stroke push 22 footer?

Seems memories are short. Back when the OMC "Fat 50" was introduced it was advertised on 24-25 foot cabin cruisers with a full family aboard. Advertisement pictures showed these engines putting these craft on plane and doing 20 or so mph (at sea level). That was 50 hp and powerhead rated....so in today's terms, per the Xperts on here that's a reduction of 10-15% vs today's prop rated engines....So we are talking about basically a 40 hp engine pushing a 24-25' cabin cruiser with a family aboard over planing speed at 20-25 mph.

In answering the question again.......gimme a break....90 HP.......get a grip. It'll do it.

Mark

Tex - when was this? Late 1950s? Any chance those cabin cruisers were thin-hulled, plywood boats with about zero deadrise?

 

[26aftcab454]

Re: Would my 90hp 2 stroke push 22 footer?

Tex - when was this? Late 1950s? Any chance those cabin cruisers were thin-hulled, plywood boats with about zero deadrise?

Maybe they had TWO Fat Fifties on them???

to the OP-the 17ft boat with the 90hp sounds alot better.

 

[high'n'dry]

Re: Would my 90hp 2 stroke push 22 footer?

Maybe they had TWO Fat Fifties on them???

to the OP-the 17ft boat with the 90hp sounds alot better.

We had, my dad and also my grandfather, had boats in the 22 foot size range, back in the early 60s to 70s. My dad's boat was a 22 foot Lyman Lapstrake bought circa 1958. It ran twin 40s and would scoot along about 30 MPH top speed, give or take, loaded with our family of six. We would run out well over the horizon just as everybody else did in those days, fishing and diving. My grandfather had a similar "cabin cruiser" with small twins on it, I think they were Merc 50s, it was also about 22/24 feet long and would run along about 26 MPH if that. Both boats were wooden construction, had sharp entry bows and rather shallow barrel shaped sterns and aft sections. Engines were not reliable and more than once we came back on one and they sucked fuel like crazy. Neither boat weighed nearly as much as my current Boston Whaler Nantucket/Outrage 190 modified deep vee, probably a little over half the 2,200 pound bare hull weight of the Whaler we have now. Neither were as fast, neither required as much power to plane, neither were nearly as capable or seaworthy and I would rather have one modern engine, in this case a 150 Optimax than two old time point ignition, carburated geezers. Those were beautiful boats but required amazing amounts of upkeep and looking back, frankly, we should have been a little more scared of big water in them than we were as neither would have done anything other than deep six if swamped and neither were self bailing. Compared to our current Whaler, it will self bail, float with the plug out just fine and is completely stable even with six inches or a foot of water in the sole from a stuffed bow, just shove the throttle in and the water dumps out, no gray hair.

Yeah, if you close the stern, mount a bracket and put two of the 80/90 horse engines on it, you would be OK, one, uh, it would be a huge slug. Deep vee boats take a lot of power to get on top.