Craftsman 29cc 4- cycle conversion
09-03-2007, 10:11 PM
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Craftsman 29cc 4- cycle conversion
I’m in the process of converting 29cc 4 stroke engine. The engine is from the Craftsman line trimmer. I’m not 100% sure but I think the engine is made by MTD; the oil plug is on the back-plate of the engine. I know that the engine was not intended to be run inverted but this is the position that would suit my application (1/4 scale Balsa USA Pup) best. I would like to hear about the problems with this installation and perhaps solutions how to minimize the impact on the engine mounted inverted. I did run the engine on the test stand, first up-right then inverted. I know that I will have to relocate the crankcase breather line, inverted is fully submersed in oil and does not serve the purpose. I also notice that the valve cover fills with oil completely. Is this a problem? Should I run the engine with more oil in the crankcase to compensate for the cylinder cavity? What about storing of the airplane? Will oil pass the rings and fill the cylinder head?
All responses are greatly appreciated,
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All responses are greatly appreciated,
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09-03-2007, 10:27 PM
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RE: Craftsman 29cc 4- cycle conversion
I know that the Briggs engines don't like to run inverted. I know of one that blew up that way. If you know that the valve cover is filling with oil then I would think it can't return to the sump. That will cause issues. More oil in it will only cause more oil to pool where it shouldn't. Best to install it upright . I know that the Briggs engines will run inverted during a maneauver but the plane returns to upright allowing the oil to return to it's sump. Main reason I did the Honda GX-31 for my current project.
09-03-2007, 11:07 PM
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RE: Craftsman 29cc 4- cycle conversion
Very interesting! Unfortunately I have no information to add to your post- Only an observation.
Definately an MTD-made engine. Your engine bares quite a resemblence to the 26cc version that I own. It came from a Craftsman edger/cultivator. From what I have read, the 26cc version can fly/be mounted inverted, but has some power issues that make it suitable only for only certain aircraft types/weight.
John
Definately an MTD-made engine. Your engine bares quite a resemblence to the 26cc version that I own. It came from a Craftsman edger/cultivator. From what I have read, the 26cc version can fly/be mounted inverted, but has some power issues that make it suitable only for only certain aircraft types/weight.
John
09-25-2007, 11:32 PM
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RE: Craftsman 29cc 4- cycle conversion
Try a search on here. This topic has been covered numerous times. I know it will take some sorting through but it is worth it. It gets tiring starting or adding to an extensive thread to have the same question asked over and over and over again. It's not worth retyping everything. Try searching for Ryobi 26cc. It's the same engine except 26cc.
