| Author |
Message |
    
narrabay
New member
Username: narrabay
Post Number: 1
Registered: 02-2016
| | Posted on Thursday, February 04, 2016 - 01:27 am: | 
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hi all,
I have an old style 12ft skiff, and looking to put a small old 1 or 2 cyl gasoline inboard with the following specs:
under 100lbs (as light as possible)
four stroke
reliable
2-8hp
water cooled
the great thing is I have noticed a huge number of old engines were produced, but no idea which ones are reliable, etc.
suggestions and idea appreciated
thanks!  |
narrabay
New member
Username: narrabay
Post Number: 2
Registered: 02-2016
| | Posted on Thursday, February 04, 2016 - 02:35 am: |
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I will add that something which runs like this would be ideal... wow
https://youtu.be/Ls6s4UyYYuE |
bruce
Senior Member
Username: bruce
Post Number: 522
Registered: 07-2002
| | Posted on Thursday, February 04, 2016 - 09:18 am: |
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Chris, Look for a Kermath Sea Pup |
narrabay
New member
Username: narrabay
Post Number: 3
Registered: 02-2016
| | Posted on Thursday, February 04, 2016 - 07:28 pm: |
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Thanks Bruce, I have some trouble locating much info on these. But still trying.
Other ideas welcome! I even looked at ideas to liquid-cool cast iron small engines (not really workable). So its just a matter not not choosing anything with an Achilles heel like one key part that simply unavailable or anything like that. |
jb_castagnos
Senior Member
Username: jb_castagnos
Post Number: 1139
Registered: 07-2002
| | Posted on Thursday, February 04, 2016 - 10:40 pm: |
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Most of the early 4 strokes were heavy engines, you'll be limited to single cylinder engines. Not many under 100 lbs. |
narrabay
Member
Username: narrabay
Post Number: 4
Registered: 02-2016
| | Posted on Thursday, February 04, 2016 - 11:43 pm: |
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hi jb I am starting to figure that out. of course that 2 cyl albin motor was so smooth it almost may be worth considering a larger boat if something like that were to turn up. |
miro
Senior Member
Username: miro
Post Number: 844
Registered: 11-2001
| | Posted on Sunday, February 07, 2016 - 07:52 am: |
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Even in a 12 ft skiff, the difference in weight of an engine has not much of an effect. IF you approximate the hull shape ( looking from the top down) by a triangle, you can easily estimate the effect of a heavier engine. You'll probably find that an additional 100 lbs won't cause the hull to be much lower in the water.
The main determinant of your boat's speed is the length of the hull at the waterline.
Rough estimate of the (so-called) hull terminal speed is 1.58 x square root of the hull length (in ft) .
So, longer boats go faster for the same power.
Think about the effect of adding a passenger like me - about 250 lbs :=} - slightly more after a visit with the Cajun gang in March
But to answer your question, I'd suggest an slightly later engine - one that has counter weights on the crankshaft so the vibration is less. A two cycle engine has the advantage of being reversible so you don't need a transmission.
Miro |
wrenchguy
Advanced Member
Username: wrenchguy
Post Number: 37
Registered: 03-2008
| | Posted on Sunday, February 07, 2016 - 10:04 am: |
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4 grins and giggles u might consider1 of these uncommon vintage jewels, rather hard 2 find though.
https://www.youtube.com/watch?v=xb0ikhNDcRA
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ernie
Senior Member
Username: ernie
Post Number: 2228
Registered: 01-2002
| | Posted on Sunday, February 07, 2016 - 04:20 pm: |
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A Palmer YT 1 would be the easiest to find and most likely do the best job. |
narrabay
Member
Username: narrabay
Post Number: 6
Registered: 02-2016
| | Posted on Sunday, February 07, 2016 - 11:03 pm: |
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thanks ernie |
narrabay
Member
Username: narrabay
Post Number: 7
Registered: 02-2016
| | Posted on Tuesday, February 09, 2016 - 02:16 am: |
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OK I looked up the YT1, a beautiful engine, and of course info on these old marine engines seems somewhat scarce. But I did see that they also made a YT2 which is essentially two conjoined YT1's. Anyway, does anyone know the weight, and the general availability of FNR transmission for these (do they usually have one?) |
ernie
Senior Member
Username: ernie
Post Number: 2229
Registered: 01-2002
| | Posted on Tuesday, February 09, 2016 - 08:55 am: |
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YT 1 specs
Add about 50 pounds for the reverse gear. YT1s are quite common. Yt2s are not.
http://www.oldmarineengine.com/history/Palmer/PalmerYTSpec.htm |
narrabay
Member
Username: narrabay
Post Number: 8
Registered: 02-2016
| | Posted on Tuesday, February 09, 2016 - 12:53 pm: |
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ok very cool thanks Ernie, I saved that into my folder for this project. I'm not sure if 2hp will suffice though which is why I asked about the YT2, OTOH these engines obviously are heavy per hp. The Kermath Sea Pup at 5hp may be more in line. But I'm open to all idea including finding a slightly larger hull if need be. The prop, shaft, log, rudder also add to the weight.
That yt1 at 130lbs, plus 50 for the gearbox, plus (est) 40 more for everything else, now we're at 220lbs. I'd say thats probably the upper reasonable range on this hull for power. I plan to run on Narragansett Bay (only on nice days!) |
ernie
Senior Member
Username: ernie
Post Number: 2231
Registered: 01-2002
| | Posted on Tuesday, February 09, 2016 - 06:46 pm: |
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2 hp is plenty for 12 ft.
These old engines have TORQUE
My 20 ft fantail launch has a 3 HP Gray and is over powered. Half throttle will push it over hull speed which isn't very pleasant. |
narrabay
Member
Username: narrabay
Post Number: 9
Registered: 02-2016
| | Posted on Tuesday, February 09, 2016 - 07:43 pm: |
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Sounds good. I look forward to finding a serviceable engine (that I can afford). As well as the related running gear.
When I was a kid decades ago, I used a 2hp cast iron Briggs & Stratton as an inboard, and overpropped it to keep the rpms under 1000rpm. Thats how long this has been on my agenda. |
