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maa_melee
New member
Username: maa_melee
Post Number: 1
Registered: 10-2006
| | Posted on Thursday, October 12, 2006 - 09:14 pm: | 
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I've been lurking for a while now in search of a small make-and-break type engine to put in a small skiff I'm building. It's getting harder and harder to find anything even close to fitting the bill. I was wondering if it is at all possible to build your own engine from scratch? What about motifying a small short stroke lawnmower engine. I'm not looking to reinvent the wheel here but the engine doesn't have to be authentic. As long as it can spin a wheel and get me 3 or 4 knots in a small skiff, I'll me amply pleased. On that note and as above, how well do lawnmower/snowblower air-cooled engines fair under load and in marine environments? My biggest worry is that the engine will turn way too quickly and make way too much noise, destroying the romatic wooden boat ride. Any ideas? I appreciate your help and welcome your comments. Thanks. |
bruce
Senior Member
Username: bruce
Post Number: 124
Registered: 07-2002
| | Posted on Thursday, October 12, 2006 - 10:53 pm: |
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Paul, There are a couple small engines listed in this sites classified section. Check e-bay motors periodicly. If noise is an issue-go electric; try electric boat association. |
maa_melee
New member
Username: maa_melee
Post Number: 2
Registered: 10-2006
| | Posted on Thursday, October 12, 2006 - 11:44 pm: |
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I appreciate you help, Bruce. When I mention noise, there is a huge difference (in my ears) between a water-cooled engine and an air-cooled engine. Night and day. I rather prefer the rhythm of a one lunger or any 1 cyl. marine engine. The reason I mention modifying an air-cooled engine (lawnmower) was because price and availabily is an issue. So to bring up a competely new question: How do I slow down the rpm's of a 2 stroke lawnmower engine while maintaining power? I think with a big enough flywheel...
Thanks again, Bruce. |
jb_castagnos
Senior Member
Username: jb_castagnos
Post Number: 184
Registered: 07-2002
| | Posted on Friday, October 13, 2006 - 07:11 am: |
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A heavy flywheel will help any engine run slow, but the large displacement, low compression, and port timing of the old engines were designed for max hp at low speeds. You aren't going to duplicate this with a small lawnmower engine. An air coled engine will need a fan and will put heat in the boat. |
barry
Member
Username: barry
Post Number: 19
Registered: 02-2006
| | Posted on Friday, October 13, 2006 - 11:34 am: |
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Paul,
I have several two cycle marine engines of the type that you are seeking, both one and two cylinders. I plan to advertise these for sale in the near future. All have been totally rebuilt with new bearings, wrist pins, rings, timer, pump parts etc. Each uses a refurbished Schebler model D carburetor and can be supplied with rebuilt buzz coil.
The smallest is a one cylinder, 3 ¼" bore x 3 ½” stroke that would best operate at about 750 RPM. It weighs about 110 lbs and would be an ideal power plant for a skiff. An image is attached.
I can also provide training and instructions using my test bench as might suit a new user.
http://www.oldmarineengine.com/discus/messages/5/95722.html
If there is any interest, please contact me by email. Just click on my username to access my email address.
Barry
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