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DIY Home Built Motorized Bicycle (non kit) Post all about your home built rides here. Weedwacker motors, lawn mower engines ect. This area is for non kit builds

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  #1  
Old 10-01-2014, 05:08 AM
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Ludwig II Ludwig II is offline
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Default Thread for alternative engines

I'm starting this for people who either don't want a kit engine, or who want to experiment with other engines.

I've been looking around, inspired by mistaking a naked Bike Bug for a concrete /rescue cutter, at cutters like that.

Most easily available engines are bulky along the like of the crankshaft, but some of the disc cutters aren't. This means a drive roller direct to a wheel can be added in place of the cutter, or a sprocket or pulley can be fitted. They're also usually above 50cc, powerful, and engineered for long reliable service under conditions of poor care or maintenance. My Mk2 may well get one of these.

I also found there are petrol driven angle grinders with 90 degree bevel drive gearboxes. Although you'd have to work out your own drive from the disc mount, at least it can be a handy unit to experiment with in different locations. The down side, if it is one, is the low cc of the engine, but since they appear to have a standard 4 bolt mounting pattern, a bigger engine is possible.
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Old 10-01-2014, 05:19 AM
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lowracer lowracer is offline
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Default Re: Thread for alternative engines

Ludwig,
I'm watching this thread!
-Low-
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  #3  
Old 10-01-2014, 05:42 AM
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Ludwig II Ludwig II is offline
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Default Re: Thread for alternative engines

Well, I've taken the plunge with a minimoto and 3:1 box, but we're bitten by the bug, and kits are too easy.

Tillers/cultivators often have a 90 degree reduction box, and I've seen numbers like 90:1 stated. That might just be a little too low geared even for me.

Last edited by Ludwig II; 10-01-2014 at 07:55 AM.
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Old 10-01-2014, 05:52 AM
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silverbear silverbear is offline
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Default Re: Thread for alternative engines

Different engines from different eras keep it interesting. Signing on...
SB
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  #5  
Old 10-01-2014, 06:01 AM
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Ludwig II Ludwig II is offline
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Default Re: Thread for alternative engines

You'll like this then.

http://www.thelotusforums.com/forums...l-drag-racing/
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Old 10-01-2014, 06:37 AM
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cannonball2 cannonball2 is offline
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Default Re: Thread for alternative engines

The twin engine kart reminded me of the twin and even triple Mac and West Bend engine karts of my youth. Direct drive even! Chainsaw derived of course!
Im kicking around a build based on a twin R/C engine. They have become relatively cheap and pretty reliable in the last few years.
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Old 10-01-2014, 03:55 PM
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Ludwig II Ludwig II is offline
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Default Re: Thread for alternative engines

In searching for info on the Norman engines, I ran across the Stuart Turners, and also an odd one I'd never known about. Royal Enfield made a flat twin 350 2 stroke genny engine.

Surely, in all the production of America, there must have been a flat twin 4 stroke by somebody?
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Old 10-01-2014, 06:44 PM
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Ludwig II Ludwig II is offline
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Default Re: Thread for alternative engines

Interesting sideshift, Onan did a widely available flat twin.

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Old 10-01-2014, 06:58 PM
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Ludwig II Ludwig II is offline
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Default Re: Thread for alternative engines

The "Albion", by a character called Bodger. Steel plate crankcases are just one solution to the problems in his way, but it works. I don't have those skills, but you don't need to be constrained by convention, when what you're doing is so far from mainstream anyway.
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Old 10-01-2014, 11:31 PM
msrfan msrfan is offline
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Default Re: Thread for alternative engines

Good thread Ludwig. I like alternate engines also. This 24'' Schwinn has a Stihl 4hp backpack blower motor which was a challenge to mount, but shows promise. It is a 4Mix engine that is a 4 stroke running on mixed fuel. The Comet drive didn't work so I installed a Cobra gokart clutch and will be experimenting with a larger carb soon.








I also have some water pump motors that are really compact and deliver 3-4 hp.
Alternate drives interest me. Like using an outboard boat motor lower section for a shaft drive bike.
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