Poll: (350 mpg goal) PP to Kampong Cham (125 km) on 1 litre.
Poll: (350 mpg goal) PP to Kampong Cham (125 km) on 1 litre.
***No need for bets, I already did 125 km/l on test run, and that is still with an unbroken in engine. Likely to go up a fair bit later on***
Setup on the bike:
Standard 8.8:1 compression ratio 39mm piston, one head gasket plate removed (-.25 mm of clearance)
13mm intake Honda C50 cylinder head
13mm intake Honda Chaly 50 manifold
10mm restrictor plate
Keihin PB15 carburetor with #30 Pilot jet and #65 main jet
Tyres at 3 bar pressure
Small bearing engine cases from Honda C50
"Small" final drive gear
13/28t sprocket combo
10W-40 oil
Constant cruise at 40 kph = 127.7 km/l, 361 mpg or .783L/100km
Original fuel economy best = 88 km/l, 248 mpg or 1.13L/100km
Bets anyone?
The bike in question is a Honda Giorcub (not a Super Cub), 4 speed clutched manual full faring scooter. It features a 49cc, 3.5 horsepower engine and 0-100 time of impossible, top speed of 55 kph.
As of now, (this is my second one of these), I've managed to top out at "just" 70 km/l (190 mpg or 1.4L/100) but it think it can do better with a little tinkering. To be honest though, I have no idea if it's even possible, and this build is more shooting for the stars than anything.
Wanting to see what you all think (or if you care ) and if you think it's possible.
I'll be making the ride in a few weeks, building up the scooter in the meantime on this thread.
Cheers,
Akira
Setup on the bike:
Standard 8.8:1 compression ratio 39mm piston, one head gasket plate removed (-.25 mm of clearance)
13mm intake Honda C50 cylinder head
13mm intake Honda Chaly 50 manifold
10mm restrictor plate
Keihin PB15 carburetor with #30 Pilot jet and #65 main jet
Tyres at 3 bar pressure
Small bearing engine cases from Honda C50
"Small" final drive gear
13/28t sprocket combo
10W-40 oil
Constant cruise at 40 kph = 127.7 km/l, 361 mpg or .783L/100km
Original fuel economy best = 88 km/l, 248 mpg or 1.13L/100km
Bets anyone?
The bike in question is a Honda Giorcub (not a Super Cub), 4 speed clutched manual full faring scooter. It features a 49cc, 3.5 horsepower engine and 0-100 time of impossible, top speed of 55 kph.
As of now, (this is my second one of these), I've managed to top out at "just" 70 km/l (190 mpg or 1.4L/100) but it think it can do better with a little tinkering. To be honest though, I have no idea if it's even possible, and this build is more shooting for the stars than anything.
Wanting to see what you all think (or if you care ) and if you think it's possible.
I'll be making the ride in a few weeks, building up the scooter in the meantime on this thread.
Cheers,
Akira
Last edited by AE86 on Tue Jan 12, 2016 12:04 pm, edited 2 times in total.
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Awesome Akira. That's a two stroke ?
Be bloody careful on the highway - those dinky little wheels and all.
Be bloody careful on the highway - those dinky little wheels and all.
Haha - my money’s on Playboy
On a track, you'd have a better chance.
Almost certain that traffic will not allow you to get the best from the engine, so voted "no".
Almost certain that traffic will not allow you to get the best from the engine, so voted "no".
Not an expert on the subject at all, but it seems very ambitous, maybe a bit too much. Good luck any way, but my vote is 'no' as well.
4 stroke. It's why it takes 31 seconds from 0-55. With 2 strokes I'd say "no way", thirsty buggers.Petrol Head wrote: Awesome Akira. That's a two stroke ?
I think that's going to be the determining factor which breaks the camel's back here. Will hope for good traffic and clear roads.Chuangt2u wrote:On a track, you'd have a better chance.
Almost certain that traffic will not allow you to get the best from the engine, so voted "no".
Honestly, I voted "no" also as my prediction is that I'll get around 100 or maybe 105 km/l with optimum gearing and some weight reduction and conk out just shy of my goal. We'll see...Jaap wrote:Not an expert on the subject at all, but it seems very ambitous, maybe a bit too much. Good luck any way, but my vote is 'no' as well.
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stop pissing around and get one of these
thaiingrish
Price: 41360.00 THB
Special Price: 29,000.00 THB
Brief Description:
Green motorcycle love the Environment Reduce oil use Night air the environment
<its electric buy online from http://www.shopat7.com/automotive>
thaiingrish
Price: 41360.00 THB
Special Price: 29,000.00 THB
Brief Description:
Green motorcycle love the Environment Reduce oil use Night air the environment
<its electric buy online from http://www.shopat7.com/automotive>
Choose a cool day; lean the carb right out; strip the weight of bodywork, lights, seat, stands, electric starter, etc; pressure up to solid tyres on skinny rims; don't eat for 3 days, shave your head, and ride flat on the tank and wearing only speedos.LexusSchmexus wrote:No way. What kind of tinkering could you do? Increase compression? Change the gearing, put really high tire pressure on slick tires? I can't vote on tapatalk, but I say no. Do try though!
Couldn't do the speedo though.
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The plan is, as of now, to stick as close to a streetable scooter. Besides swapping sprockets (which I will). Up the compression a tiny bit (Maybe 10.5:1 from 8.8:1) and reduce the internal drag as much as possible. This means light duty drive bearings, light duty final drive gears, light duty clutch, roller rocker arms, small oil pump, 30 weight oil, 55 psi in both tyres, full faring (wind resistance), and run it a little lean with a water bottle aiding in cooling (Khmer style).LexusSchmexus wrote:No way. What kind of tinkering could you do? Increase compression? Change the gearing, put really high tire pressure on slick tires? I can't vote on tapatalk, but I say no. Do try though!
I took it on a little "test" run today to Prek Eng and back...80 km/l (225 mpg or 1.25L/100) give or take. I went 20 km (according to the odometer) and used 250 ml of petrol which...well, great but...far from the target. Not looking good. Only thing I can take comfort in so far is that it's on stock jetting and "heavy duty high drag" internals. Hopefully the reduction will see some positive effects.
Next plan is to see where the best "power setting" is for the jetting and then hope I don't toast the valves in the process.
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I'd say it's possible. Especially with that new road; smooooth as a baby's behind. Just make sure the day isn't too windy, or if it is, make sure it's a tailwind.
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I imagine you in the same position but wearing something more like this:AE86 wrote:
Couldn't do the speedo though.
Alright, cracked open the motor and found a few areas where I can save on some internal friction.
Cases...
Firstly, big drive bearings that I suspect it had. I know bearings are bearings, nearly eliminating all friction in the first place, but the smaller the surface area, the lower the friction. Small gains, probably not worth it, too late bought the parts already...
Located some small cases for it.
Drive bearing size comparison.
Carburetor on these beast seems to flow well...maybe a little too well.
I think restricting it with a mini carb would help...
As would putting on a cylinder head with pea sized valves and ports.
Looks like there's some gains to be had at the expense of a little power. I'm guess I'll end up with a 2 3/4 horsepower machine when I'm done,
Cases...
Firstly, big drive bearings that I suspect it had. I know bearings are bearings, nearly eliminating all friction in the first place, but the smaller the surface area, the lower the friction. Small gains, probably not worth it, too late bought the parts already...
Located some small cases for it.
Drive bearing size comparison.
Carburetor on these beast seems to flow well...maybe a little too well.
I think restricting it with a mini carb would help...
As would putting on a cylinder head with pea sized valves and ports.
Looks like there's some gains to be had at the expense of a little power. I'm guess I'll end up with a 2 3/4 horsepower machine when I'm done,
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