UNDERSTANDING THE DIFFERENT TYPES OF ENGINES


Type A Type B Type C
 25 cc's  35 cc's  49 cc's

Type A

 

The most popular consumer brands are Ryobi, Homelite, and Sears. Examples are: weed eaters, generators, water pumps, leaf blowers and hedge trimmers. 

These small 2 cycle engines exert low to almost no loads onto their drive shafts and are well suited for their application. After all how much horse power is required to slice a blade of grass or blow leaves, transfer water or trim the grass around a fence?

These consumer products are rated for small jobs around the house. They’re inexpensive to purchase and made for the mass, so quality and longevity are often sacrificed for pricing. Moreover, their cylinders, pistons and rings are small with few cooling fins; thus, deliver high R.P.M. and low TORQUE. They range between 18cc to 33cc’s or ½ hp to 1.3hp.

These small engines, when used for bicycle motors are a poor choice, because they burn out for the following reasons:

Their crankshaft rotates on one ball bearing vs. two. 
When used to propel a cyclist and his bicycle an enormous amount of heat is created in that ball bearing, causing the grease in that ball bearing to leak out of its housing, initiating its demise.
Their piston has a single ring and a small cylinder with relatively small cooling area and fewer cooling fins for the heat to dissipate. 

Therefore, when the engine is under a load, it overheats, the oil lubricant breaks down in viscosity, binding and scuffing occurs to the cylinder wall, causing the engine to seize. 

Many new comers to our industry have had very little research done with the various engines out there, and that is understandable, since they lack the funds and the experience to develop a good product. They develop a website, add excellent graphics and advertise a low budget bicycle motor to the unsuspecting consumers.

Moreover, when suggesting the above brands as bicycle motors, they do not take into consideration
the sum of the 12 most important factors that make a dependable and long lasting bike motor:

Person’s Weight
180 to 220lbs or 250 to 300lbs. 
Affects: cylinder, piston, piston shaft and rings.

Bicycle Weight
30 or 40lbs. 
Affects: cylinder, piston, piston shaft and rings.

Added Cargo
50lbs. Such as tools, groceries, trailer, etc. 
Affects: cylinder, piston, piston shaft and rings.

Road Conditions
Paved or unpaved surface. 
Note: On unpaved surfaces, more power is required and the engine will have to work harder.

Tire Type
Road, Slick and Knobby Tires. Note: Knobby require engine to work harder, 
consume power, create heat, loss of speed and poor fuel mileage. 
Affects: cylinder, piston, piston shaft and rings.

Inclines
Each degree of incline or % is equivalent to hauling an additional 20lbs.
Inclines 7 degrees and above, requires pedal assistance.
Affects: cylinder, piston, piston shaft and rings.

Ground Temperature
Tar absorbers heat which transfers onto your tire, drive roller and engine 
shaft, which creates additional heat for the engine to cool. 
Affects: cylinder, piston, piston shaft and rings.

Air Temperature 
80 or 90 degree weather causes the engine to work much harder to keep cool. 
Affects: cylinder, piston, piston shaft and rings.

Moisture
Damp weather affect carburetion and robes power from engine, causing the
engine to work harder to deliver desired speed. 
Affects: cylinder, piston, piston shaft and rings.

Dust
Dust accumulates on the air filter, depriving oxygen to the carburetor and robes
power from engine; causing the engine to work harder to deliver desired speed. 
Affects: Cylinder, piston, piston shaft and rings.

Terrain
Wet roads, rough, unpaved roads and muddy roads require high R.P.M. 
Affecting the following parts: cylinder, piston, piston shaft and rings.

Distance 
Distances of 20+ miles are brutal to small engines, because they are often
ridden wide open, therefore, more speed, the more heat is created, ultimately
Affecting the following parts: cylinder, piston, piston shaft and rings.

“ARE YOU GETTING THE PICTURE YET? DO YOU NEED TO LEARN MORE?”

Type A Type B Type C
  25 cc's  35 cc's 49 cc's


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Roger@MotorizedFoldupBikes.com