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8.1 and a 241 ?

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8.1 and a 241 ?

Postby julio » Fri Oct 09, 2020 8:23 am

i have a 212 at the moment am considering putting in a 241 wondering if anyone can share how well the combo works..
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Re: 8.1 and a 241 ?

Postby Eagle1 » Fri Oct 09, 2020 9:52 am

We don't have enough info. Why and what kind of boat.
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Re: 8.1 and a 241 ?

Postby Hell Yes » Fri Oct 09, 2020 3:44 pm

I have a 8.1 HO and a 241. Love it.24 ft HCM 7 ft bottom averages 10 GPH.
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Re: 8.1 and a 241 ?

Postby Riverrat212 » Fri Oct 09, 2020 3:46 pm

Karl bloodsworth used to run that motor and pump combo in all his big single boats.
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Re: 8.1 and a 241 ?

Postby julio » Fri Oct 09, 2020 5:25 pm

We don't have enough info. Why and what kind of boat.

its a riddle rmx 22, 7 foot bottom. the boat works ok but seems to slip alot in whitewater, Im hoping the larger hole in the bottom and a pump that isnt barely holding on will help.. oddly it works better when your loaded down heavy and wallowing around, you know when your headed up river for the weekend. By the end of a trip when gas is low and no gear its the worst.
curious if you end up with a really slow boat or if it feels under powered.
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Re: 8.1 and a 241 ?

Postby RM20 » Fri Oct 09, 2020 5:42 pm

Try a 9 bar grate and take the impellor and barrel to Roy at Intermountain Machine for a tune-up. I've had him repitch a 4.0 impellor to a 4.2 behind an 8.1 in a 24 foot Bloodsworth boat. It works really well and it packs a good load. A 241 is around 15K and probably another 2 to 3 thousand to install.
Good luck.
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Re: 8.1 and a 241 ?

Postby Riverjohn » Fri Oct 09, 2020 8:48 pm

julio wrote:We don't have enough info. Why and what kind of boat.

its a riddle rmx 22, 7 foot bottom. the boat works ok but seems to slip alot in whitewater, Im hoping the larger hole in the bottom and a pump that isnt barely holding on will help.. oddly it works better when your loaded down heavy and wallowing around, you know when your headed up river for the weekend. By the end of a trip when gas is low and no gear its the worst.
curious if you end up with a really slow boat or if it feels under powered.

Probably the 7' bottom. It has so much lift that it allows the 212 to come unglued with a light load in the whitewater.
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Re: 8.1 and a 241 ?

Postby Eagle1 » Fri Oct 09, 2020 9:42 pm

Does it have a delta pad and how big? Like john said Too much lift. I have had 212, 213, and 241 pumps in three boats. I have a 25 now with a 241 and 84 bottom and almost never suck air. I had a 212 in a 24 with a 15* deadrise and tough to suck air and still run thin with a 84 bottom. How heavy is the riddle with normal load? Where is fuel cell? If you have enough pump now you might put pump loaders to increase flow to pump for an easy test. How many hours on pump?
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Re: 8.1 and a 241 ?

Postby Ahusk » Sat Oct 10, 2020 6:59 am

John hit the nail on the head. The 241 will make it worse because the pump will have to mount higher in the boat and the width of the delta won't match the pump. Sound like it's just a wide fairly light boat. You could just slow down in the rough stuff, but I know that's not really a solution. You could cut some of the lift strake off the back. I doubt it's creating enough lift to matter but you could always try it and it's reversible. Is the grate completely flush with the bottom. If not try shimming the front down a 1/4". It will both lift the nose and put the grate down a little further in water.
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Re: 8.1 and a 241 ?

Postby julio » Sat Oct 10, 2020 1:16 pm

i have the billit 9 bar grate, it helped have removed the ride plate and what i could to let it settle it all helped but still slips enough in frothy water to waiver your confidence.
i have a built up 4.2k hamilton impeller but am running the solas and think it actually works better same fuel consumption at cruise even tho a 100 higher but I gained 250-300 rpm at full throttle and seems to push better.
she has a belly tank and a reserve cross tank in the high deck step. my guess on weight is mid 6k.

i didnt consider the size of the delta being an issue and why would the 241 have to sit higher in the boat?
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Re: 8.1 and a 241 ?

Postby Riverjohn » Sat Oct 10, 2020 2:57 pm

julio wrote:i have the billit 9 bar grate, it helped have removed the ride plate and what i could to let it settle it all helped but still slips enough in frothy water to waiver your confidence.
i have a built up 4.2k hamilton impeller but am running the solas and think it actually works better same fuel consumption at cruise even tho a 100 higher but I gained 250-300 rpm at full throttle and seems to push better.
she has a belly tank and a reserve cross tank in the high deck step. my guess on weight is mid 6k.

i didnt consider the size of the delta being an issue and why would the 241 have to sit higher in the boat?
The Delta Pads are usually sized for the pump intake size. So if it is sized for a 212 (Which it should have been. This could also be the problem if it wasn't) Then the 241 will not sit flat on the Delta Pad area. It will be sitting higher on the angled area.
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Re: 8.1 and a 241 ?

Postby Eagle1 » Sat Oct 10, 2020 5:10 pm

Your intake grate is a milled unit or aluminum with steel ? How many lifting strakes do you have and how long and where are they located?
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Re: 8.1 and a 241 ?

Postby julio » Sun Oct 11, 2020 7:17 pm

billit grate. it does look like the bottom starts its taper up a little over an inch from the side of the grate. hmmm. the flat part of the bottom started by the pump tapers away slowly and goes almost to the front of the boat.

maybe a scott would be a better option... ? I couldnt figure out how to load a picture

lifting strakes = there are 2 per side but it also has reverse chines. the strakes closest to center are 8' ish and start about 2' forward of the pump..
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Re: 8.1 and a 241 ?

Postby julio » Sun Oct 11, 2020 7:27 pm

did scott get their chit figured out with a sales rep?
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Re: 8.1 and a 241 ?

Postby Riverjohn » Sun Oct 11, 2020 8:05 pm

julio wrote:did scott get their chit figured out with a sales rep?

It looks like Matt at Inland Marine just finished a conversion you might get a hold of him. :Drink: :Drink:
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Re: 8.1 and a 241 ?

Postby Belcon » Tue Oct 27, 2020 3:36 pm

julio wrote:i have the billit 9 bar grate, it helped have removed the ride plate and what i could to let it settle it all helped but still slips enough in frothy water to waiver your confidence.
i have a built up 4.2k hamilton impeller but am running the solas and think it actually works better same fuel consumption at cruise even tho a 100 higher but I gained 250-300 rpm at full throttle and seems to push better.
she has a belly tank and a reserve cross tank in the high deck step. my guess on weight is mid 6k.

i didnt consider the size of the delta being an issue and why would the 241 have to sit higher in the boat?


Is the solas a 3.4? Doesn't it work better that the 4.2 Hami impeller?
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Re: 8.1 and a 241 ?

Postby julio » Tue Jan 12, 2021 11:22 am

It does, for whatever reason it loads the motor like a 4k but doesn't slip like the unmodified hamilton i tried
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Re: 8.1 and a 241 ?

Postby Riverjohn » Tue Jan 12, 2021 1:45 pm

julio wrote:It does, for whatever reason it loads the motor like a 4k but doesn't slip like the unmodified hamilton i tried

Julio, What is the Max RPM your 8.1 can turn the 3.4 Solas? :Drink: :Drink:
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Re: 8.1 and a 241 ?

Postby julio » Wed Jan 13, 2021 12:35 pm

4300ish at Pittsburgh,air temp varying it a bit 4000 at cascade res.
On a good day I could just get 4000out of the 4.3 or whatever it is that I have. Meaning cool morning once the engine bay warmed up it would fall off a bit
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