26 hourston sedan power options
- Thread starter bonez10
- Start date
Eden Island
Well-Known Member
Just for some thing different, my 23 Hourston [which weighs ~6500 lbs, surprisingly close to your 26] was originally powered by 260 hp gas I/O and ran 8 to 10 gph at 22 to 25 mph.
Repowered with D3 200 hp diesel duoprop, it gets 5 to 6.5 gph [imperial] at 24 to 27. The diesel is aluminum block, so about 500 lbs less in the stern, but much of the lost weight was replaced by additional fiberglass in the stringers.
Repowered with D3 200 hp diesel duoprop, it gets 5 to 6.5 gph [imperial] at 24 to 27. The diesel is aluminum block, so about 500 lbs less in the stern, but much of the lost weight was replaced by additional fiberglass in the stringers.
Looks like you have chosen O/B?
Twins would allow you to troll on one & have a top speed of around 40 MPH. All the O/B mfgr's have prop tests/performance bulletins on their web sites detailing performance of their engines on various boats. Some boat builders have similar info; usually Yamaha O/B's on their boats. Diesel's like the example above top-out at 3600 - 4000 RPM versus 5000 - 6000 RPM for O/B's & have different gear ratio's so the O/B will troll at a lower speed at idle.
For the most part, modern marine engines are priced "per HP"; a 150 & 175 might be identical except for valve timing/fuel injection tuning but the 175 will be more expensive. Speed on a boat is expensive; you might have to nearly double the HP to gain a 10 MPH speed increase when the beginning speed is 30 MPH+.
It seems most with boats in your size range aim for a cruise of around 25 MPH at around 4000 RPM.
Twins would allow you to troll on one & have a top speed of around 40 MPH. All the O/B mfgr's have prop tests/performance bulletins on their web sites detailing performance of their engines on various boats. Some boat builders have similar info; usually Yamaha O/B's on their boats. Diesel's like the example above top-out at 3600 - 4000 RPM versus 5000 - 6000 RPM for O/B's & have different gear ratio's so the O/B will troll at a lower speed at idle.
For the most part, modern marine engines are priced "per HP"; a 150 & 175 might be identical except for valve timing/fuel injection tuning but the 175 will be more expensive. Speed on a boat is expensive; you might have to nearly double the HP to gain a 10 MPH speed increase when the beginning speed is 30 MPH+.
It seems most with boats in your size range aim for a cruise of around 25 MPH at around 4000 RPM.
ab1752
Crew Member
My 26' is a soft top that has never been weighed but it has a single IO 320HP with a VP DPS / F3 prop set. At 2,800 rpm's I am turning about 21 knots or so and I cruise between there and 3,200 RPS that delivers 24 to 25 knots. WOT is 38 knots. I am not tracking fuel consumption as it has a 300L tank that is more than sufficient for the central Straits.
As I consider one day this may be converted to outboards, I would consider the Merc V8 300HP Verado and the 350HP DP Suzuki for singles or a pair of 175HP twins. The few Island Runners I have seen from the factory had twin power and I like the idea for redundancy and stability.
As I consider one day this may be converted to outboards, I would consider the Merc V8 300HP Verado and the 350HP DP Suzuki for singles or a pair of 175HP twins. The few Island Runners I have seen from the factory had twin power and I like the idea for redundancy and stability.
Well there you go; can't get any better info than these posts!!
I converted a 24 SeaRay from a 260 HP Chevy to a 250 2 stroke Yammie years back before 4 stroke O/B's. I gained 10 MPH on the top end. It would also run WOT all day where the chevy would increase in temp & decrease in oil pressure after a few minutes of such treatment.
It sounds like 250 - 300 HP would be ideal; now it's down to single versus twins.
Given this data twin 150's could easily be downsized. www.boatdiesel.com has a prop calculator ($50 membership required). Given this known performance data from Aces, you could plug-in different HP numbers to see how it affects speed, and perhaps go from 6 cylinder engines to 4 cylinders & save weight - unless you wanna do 50.
ab1752
Crew Member
I want to go for a rip on this thing for sure someday!!
Aces
Well-Known Member
You bet! It will be back in the water late April/early May
Aces
Well-Known Member
I almost went with 200's on the last re power but i don't really have much of a desire to go much faster
ab1752
Crew Member
All right, you're right across the straits from us when we are at sechelt, be over that way for sure in early spring
brutus
Well-Known Member
47 knots that’s to slow lol, some members here would say they need twin 300 hp to push that boat.
Aces
Well-Known Member
That is true! I’ve only honestly had over 40 a few times. I’m more of a fuel conserver
Eden Island
Well-Known Member
Anything over 30, and its pretty hard to see the chunks soon enough to dodge them [maybe its my eyes].
The latest casualty was the composite bracket holding my transducer on the transom. Lowrance wants US$50 for one. Fortunately I got the fire sale price at Island Outfitters.
I'm happy at 22-27 mph, burning 5-6 gph, and dodging chunks [most of the time].
Maybe it's your brain telling you to be careful. Going fast is fun, but the older I get the more exhausting it gets. Iv'e run Ucluelet to Everett WA in a single day & was VERY worn-out at the end. It's the one's floating end-up just below the surface that bob-up as you are going over them - rare for sure, but you can't see them. Down here in Puget Sound there are government boats that go around picking up debris- go north of Campbell River where the driftwood is 4-5 feet deep on the beaches in places when the tides are big is a different story.
ab1752
Crew Member
I completely agree, its rare I am over 25 knots, on the inside anyway. I wouldn't want to go underpowered tho, having the juice out back when you need to out run and dodge errant commanders is really valuable.
brutus
Well-Known Member
Yup me too, mine top up at 40 mph in the bay on flat water, sketchy as f...k, anything over 30 mph where i fish on most days is stupid, unless you like having back pain for weeks after a 20 mile run, I think a lot of folks on here have prop selection issues more then HP issues on there boats
fishin solo
Crew Member
@albernifisher has a 300 vrod on his.... pretty sure he’s somewhere in mid 40mph top speed. Don’t know the rest of his stats cruise burn etc
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