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#1
posted to rec.boats
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weed trimmer conversion to outboard mudmotor
jimhigh66 wrote: Has anyone converted a 4-cycle weed trimmer to a "mud motor" ( I know its been done a number of times with 2-cycles. )? Menards has a 27 CC 4-cycle trimmer on sale and the Adv. claims "...more torque and power than a 2-cycle..." Jim H. Jim, I'm leary of that claim. I have a 4 cycle weedeater,a nd it IS heavier than a two stroke, it doesn't rev as fast, and it does have a psuedo-crank case for oil, so the engine would pretty well have to be in an upright position. 2 cycles you can run upside down . I can't verify the claims as mor hp. and torque, though. I like running the two cycle better simply out of weight. I've thought of makeing one myself, Why? I don't know..... |
#2
posted to rec.boats
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weed trimmer conversion to outboard mudmotor
Has anyone converted a 4-cycle weed trimmer to a "mud motor" ( I know its
been done a number of times with 2-cycles. )? Menards has a 27 CC 4-cycle trimmer on sale and the Adv. claims "...more torque and power than a 2-cycle..." Jim H. |
#3
posted to rec.boats
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weed trimmer conversion to outboard mudmotor
Tim wrote:
jimhigh66 wrote: Has anyone converted a 4-cycle weed trimmer to a "mud motor" ( I know its been done a number of times with 2-cycles. )? Menards has a 27 CC 4-cycle trimmer on sale and the Adv. claims "...more torque and power than a 2-cycle..." Jim H. Jim, I'm leary of that claim. I have a 4 cycle weedeater,a nd it IS heavier than a two stroke, it doesn't rev as fast, and it does have a psuedo-crank case for oil, so the engine would pretty well have to be in an upright position. 2 cycles you can run upside down . I can't verify the claims as mor hp. and torque, though. I like running the two cycle better simply out of weight. I've thought of makeing one myself, Why? I don't know..... Anybody comes up with something actually useful, be sure and post it. Google brings up nothing but wild speculation. DT |
#4
posted to rec.boats
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weed trimmer conversion to outboard mudmotor
On Apr 4, 11:35 am, dt wrote:
Tim wrote: jimhigh66 wrote: Has anyone converted a 4-cycle weed trimmer to a "mud motor" ( I know its been done a number of times with 2-cycles. )? Menards has a 27 CC 4-cycle trimmer on sale and the Adv. claims "...more torque and power than a 2-cycle..." Jim H. Jim, I'm leary of that claim. I have a 4 cycle weedeater,a nd it IS heavier than a two stroke, it doesn't rev as fast, and it does have a psuedo-crank case for oil, so the engine would pretty well have to be in an upright position. 2 cycles you can run upside down . I can't verify the claims as mor hp. and torque, though. I like running the two cycle better simply out of weight. I've thought of makeing one myself, Why? I don't know..... Anybody comes up with something actually useful, be sure and post it. Google brings up nothing but wild speculation. DT- Hide quoted text - - Show quoted text - Been there, tried that :-) The weedwacker had way too high an rpm at the end of the shaft. Once you have to start messing around with gear ratios the cost savings is gone. I took the trolling prop off and stuck the string spool back on and sold it on our local used stuff for sale site for the 25 bucks I paid for it. |
#5
posted to rec.boats
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weed trimmer conversion to outboard mudmotor
jamesgangnc wrote: On Apr 4, 11:35 am, dt wrote: Been there, tried that :-) The weedwacker had way too high an rpm at the end of the shaft. Once you have to start messing around with gear ratios the cost savings is gone. I took the trolling prop off and stuck the string spool back on and sold it on our local used stuff for sale site for the 25 bucks I paid for it. Makes sense to me. I would think it would be kind of neat if someone would come up with a "jet" kit for one, though. |
#6
posted to rec.boats
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weed trimmer conversion to outboard mudmotor
( I want to build a shallow-water drive for a canoe. A small outboard
dosen't work well -- been there, done that.) If you google "homemade mudmotor" on about the third page you'll find a bunch of posts on this subject ( boatdesign.net/fourms/... ). According to the posts this has been done successfully and unsuccessfully with 2-strokes -- depends on how it's done. But nothing is mentioned about 4-strokes. I've posted a question there but no results yet. I would think the orientation of the power head would be about the same for the mudmotor application versus weed trimmer. One possible problem with a 2-stroke: Exhaust "tuning" can be critical and if you try to quiet them with an additional muffler I'm not sure what it would do to the perfomance. |
#7
posted to rec.boats
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weed trimmer conversion to outboard mudmotor
jimhigh66 wrote: ( I want to build a shallow-water drive for a canoe. A small outboard dosen't work well -- been there, done that.) If you google "homemade mudmotor" on about the third page you'll find a bunch of posts on this subject ( boatdesign.net/fourms/... ). According to the posts this has been done successfully and unsuccessfully with 2-strokes -- depends on how it's done. But nothing is mentioned about 4-strokes. I've posted a question there but no results yet. I would think the orientation of the power head would be about the same for the mudmotor application versus weed trimmer. One possible problem with a 2-stroke: Exhaust "tuning" can be critical and if you try to quiet them with an additional muffler I'm not sure what it would do to the perfomance. There are some wweed eaters that have a cintrifugal clutch in them of sorts. I've seen some more expensive types (Stihl) that when the engine dies the head wil still turn or "coast" i would think that would work pretty good, seeing one could idle with out the prop end turning, yet under throttle it would have propulsion. Unlike trying to start it with the prop in the air, just to drop it down and have water splatter all over the place and kill the engine too. I know the battries would be a hassle, but couldn't a decent trolling motor work? |
#8
posted to rec.boats
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weed trimmer conversion to outboard mudmotor
On Apr 4, 6:34 pm, "jimhigh66" wrote:
Tnx Tim According to some posts on the "google site" the clutches tend to burn-up when converted to this use. The mud motor (one brand name: go-devil) design puts the prop well back behind the transom so the splashing water probably wouldn't be a problem to the boat. ( Have you looked at "mud-motor" designs ?? ) I considered adapting a tolling motor but there is the weight of the battery and limited "range" compared to gas power. Regards, Jim H. Well come to think of it, I saw, I believe on ebay, where Honda had a "mud motor" and demonstrating it, had a guy in some jon boat ... standing up, tuddering this contraption along. it was reminding me of the boats in the Thialand and that part of asia where they had these small car engines on some gondola type boat tooling down canals, etc. Anyhow, this dude is standing in the back of this jon boat, and the sequence of pics shows him attacking a beaver dam. The boat climbs right up the side of the dam with the prop chopping away at the wood sticks, and evidently it went fast enough that when it got to the top it threw the guy out of the boat. Most strange indeed. |
#9
posted to rec.boats
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weed trimmer conversion to outboard mudmotor
Tnx Tim
According to some posts on the "google site" the clutches tend to burn-up when converted to this use. The mud motor (one brand name: go-devil) design puts the prop well back behind the transom so the splashing water probably wouldn't be a problem to the boat. ( Have you looked at "mud-motor" designs ?? ) I considered adapting a tolling motor but there is the weight of the battery and limited "range" compared to gas power. Regards, Jim H. |
#10
posted to rec.boats
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weed trimmer conversion to outboard mudmotor
"Tim" wrote in message ps.com... On Apr 4, 6:34 pm, "jimhigh66" wrote: Tnx Tim According to some posts on the "google site" the clutches tend to burn-up when converted to this use. The mud motor (one brand name: go-devil) design puts the prop well back behind the transom so the splashing water probably wouldn't be a problem to the boat. ( Have you looked at "mud-motor" designs ?? ) I considered adapting a tolling motor but there is the weight of the battery and limited "range" compared to gas power. Regards, Jim H. Well come to think of it, I saw, I believe on ebay, where Honda had a "mud motor" and demonstrating it, had a guy in some jon boat ... standing up, tuddering this contraption along. it was reminding me of the boats in the Thialand and that part of asia where they had these small car engines on some gondola type boat tooling down canals, etc. Anyhow, this dude is standing in the back of this jon boat, and the sequence of pics shows him attacking a beaver dam. The boat climbs right up the side of the dam with the prop chopping away at the wood sticks, and evidently it went fast enough that when it got to the top it threw the guy out of the boat. Most strange indeed. You see the Honda and mostly Yamaha extended shaft mud motors all over the Amazon. A dugout canoe with a 8' or so shaft extending off the back. I did not see any using them in the mud, but the river carries a lot of silt. But these motors are a lot bigger than a weed eater motor. At least 25-40 hp. |
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