Transom HP limits

[Nickstr-1]

Hello new to forum.
I have a 2004 22’ Cruser
Currently running (2) Honda 40hp.

Like to up grade to a single 140hp

Transom is rated for 100hp.

Anyone have any experience with this type of upgrade.

Nick

[jennykatz]

The 22 will be very unstable at WOT probably over 40mph The newer 22s were rated at 115 Hp (2007 or so)I don’t know if they beefed up the transom ?
The major problem. Would be if there was an accident the Lawyers would have a field day
When Aux Coast Guard does Safety checks they look for Hp placards
When we repowered our CC23 Venture we went with a115 Merc. CT which has the bigger gear case of a150hp lower unit it was rated at 120hp the next few years were rated at 150hp Good luck with your repower

[thataway]

[A Fishin C]

don't have an answer on hp limits but you will never need that amount of hp or torque on a 22. you will never use the top rpms of this engine, it is likely too heavy, i think batteries, kicker and main max 500 pounds limit per C-Dory owner's manual.

You will not ever want to go over 28 knots. The boat is scary after that speed. I know. Get a 115 with a 4 blade prop probably 15 pitch. Get a lightweight ie. yamaha 115 4 stroke.

That is my $0.02 worth. Best of luck eh.

[Nickstr-1]

Thanks for all the great input.
Currently I run between 17 & 22 mph and burn 4.5 to 5 gph.
The 115 hp and the 140 hp are the same block and weight. The interesting fact is they are thr same block and overall weight (428 lb). Fuel burn at 3000 rpm is actually less on the 140 hp model.

I would like to cruse in flat water at 30 mph or 26 knots.
I agree boat would be danergous at higher speeds.

Considering a transom stiffener plate, wondering if anyone has tried this.

Nick

[jennykatz]

If you are buying new or was the Suzuki 140 given to you? If not buy the 115 and be happy you will be able to do 30mph all day long
When we bought our 90hp Suzuki in 06 it was the same block as the 115 hp Suzuki 1.9 L the 140 hp was 2.1 L so the 140 was a little bigger
For insurance and for $$ I would buy the 115 in fact go for the 115 Mercury CT which has the bigger gear case We have the same motor on a23venture WOT about 32-35 mph
Good luck Jim

[Hunkydory]

Nick, I too think 140 hp single is pushing the hp for a CD22 beyond need or practicality. I had the same 40hp twin Honda’s as you & did a upgrade to twin Honda 60’s last summer, which I have documented in this thread & will continue to update it as I learn more about the increased hp performance.

http://www.c-brats.com/viewtopic.php?t=27697

My opening post on this thread contained this “This summer my twin 20 year old Honda 40’s are running as well as they ever have, but being as I like to explore in remote areas where engine troubles may be more than just an expense & irritation, I’ve decided to repower with new twin Honda BF 60’s. Only their use will confirm or not the added price & extra 50 pounds total weight over the twin 40’s to be worth the benefit of having more power at lower rpm, either when running just one or both. One thing for sure, I’ll never be concerned in rough seas about boat control if one of the motors does go down like many who run a single with a kicker & I will likely be able to plane on just one motor if that option becomes necessary.

For those interested, Sportscraft Marine who is the oldest C-Dory dealership has no problem with selling & installing the twin 60 hp motors even though they are 5 hp over the max plate rated hp. The owner of Sportscraft Marine informed me, as I already knew, that their is no legal requirement for hp ratings on a power boat over 21 feet. The rated hp from the factory for the CD22 is a recommendation only, though in the motor mounting process they will be making sure my transom is sound. Also the total weight of the twin BF 60’s are the exact same as the Honda BF115 that C-Brat, Lew had mounted on his CD22 without a kicker.”

Jay

[Fishcatcher907]

Did you go through with it?
Do you have the blue boat I seen in Whittier white the black Suzuki 140?

[tsturm]

[Nickstr-1]

As an update I removed the old twin Honda’s 40hp
First I spoke with the design engineer at the new CDory plant. He said that there would be now problem with the 140 hp in terms of hull performance but would make sure that the transom was solid. I discussed the addition of a stiffner and he gave the modification 2 thumbs up.

I had an 3/8”aluminum plate fabricated and powder coated to match the boat.

I have ran the new motor for about 50 hours so far. Top speed at about 6,000 rpm is 30 mph. Cruse at 4,800 rpm is around 24 mph. Fuel burn at 4,800 rpm is about 4.8 gal per hour.

Because the 140 ho has the troll feature it works well for fishing and the 60 amp charging is awesome with the drum wench, pit puller, etc.

Very happy with the upgrade.

For those interested I chose the white model motor and it looks sharp with the CDory

[Foggy]

Guess I'm happy w/your mostly ill-advised over the top repower, if you are.
But why wouldn't you first didn't think 2 60s rather than a 140

I've found though, going against the grain and good luck isn't always wise
and it doesn't last. Simply put, things go wrong. The marine environment is
very unforgiving.

Until then then, enjoy.

Aye.

[Fishcatcher907]

[Foggy]

I'd rename Nichstra's boat "Edge Finder".

Aye.

[thataway]

The Suzuki 140 is a lot different than a Honda or Yamaha 150. The Suzuki 140 is on the same block as the 115, same weight. I have owned a 140 for over 13 years. Good engine, which I use on the Caracal Cat which was originally rated for a 115, then upped to 140.

The speed of 30 mph at 6,000 RPM, is what one would expect with a 90 Honda and light boat. The 140 would give higher speed at full load. With a different prop, I suspect that the 140 would give speeds in the 36 mph arena.

[Knipet]