reaching->c
New Member
Hi, there this is my first thread and also my first attempt on try to build a motorized bike. I've got an average size CHEAP mountain which served me well during the past 5 years (and i use it a lot i.e. there's no way I'm walking anywhere..........I'm cycling to the spot) which I'd like to hook an engine too after restoring a bit. I have in mind to modify a frame to fit in a motor in it's middle. My objective is to reach 63 mph (I 'know it may be hard). I will also be building a gearbox of say 3 gears shifts to get the at most efficiency out of the engine. I ain't going to lower too much the gear ratio for more torque since I can pedal my way up thus having a gearbox aimed for speed. Now my 1st question is how much hp (or kWs if you prefer) do I approximately need and which motor to use (general purpose not those ****ing 49cc, "80cc" "engine"). I was thinking of a 6hp petrol/gasoline engine 4-stroke of about 2800rpm? What do you think and suggest anything i.e. suggesting and tips and warnings ANYTHING Thanks for reading!
edit: I noticed all of you are pointing that out so things i I didn't mention are:
1. The frame will be modified to fit the engine and also reinforced in it's weak points
2. I'm going to use some reinforced hydraulic rim brakes (the reason why not choosing disk brakes are mainly because they put to much stress on only one part of the rim which in cases can deform the rim itself. Rim brake disadvantages are that it can overheat the rim while going through long, long steep slopes but that is not my case and also i'm a bit of a hard driver (fast acceleration/deceleration) (Coaster brakes were a good option because 1. they aren't strong enough in my case and also not easy upgradeable and they need a lot of maintenance))
edit: I noticed all of you are pointing that out so things i I didn't mention are:
1. The frame will be modified to fit the engine and also reinforced in it's weak points
2. I'm going to use some reinforced hydraulic rim brakes (the reason why not choosing disk brakes are mainly because they put to much stress on only one part of the rim which in cases can deform the rim itself. Rim brake disadvantages are that it can overheat the rim while going through long, long steep slopes but that is not my case and also i'm a bit of a hard driver (fast acceleration/deceleration) (Coaster brakes were a good option because 1. they aren't strong enough in my case and also not easy upgradeable and they need a lot of maintenance))
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