[shashanka]

I recieved the following in my in-box from MotorBeam last night. I don't know if it has appeared in our forum before, but I felt it to be a worthy inclusion!

Well done, Vaibhav Bajpai ! :

https://www.motorbeam.com/amar-jawan...an-army-video/

[msdivy]

Originally Posted by shashanka

I recieved the following in my in-box from MotorBeam last night. I don't know if it has appeared in our forum before, but I felt it to be a worthy inclusion!

Well done, Vaibhav Bajpai ! :

https://www.motorbeam.com/amar-jawan...an-army-video/

Good effort .

Indian Makes 800cc Bike, Calls It Amar Jawan

For a moment, I thought the bike was from here - https://www.indianmotorcycle.in/

[shashanka]

Originally Posted by msdivy

Good effort . For a moment, I thought the bike was from here - https://www.indianmotorcycle.in/

Hello msdivy,

Yes I know - actually when I saw the title & "800 cc" I thought that it must be a newly developed engine! But full kudos to the boy (Vaibhav) for his initiative & perseverance, that in less than two years - he says he took 1.5 years - he was able to come up with a working road-going example. No doubt it may take some refinement & development but full credit for his idea. Must say Indian entrepreneurs in this field are showing great spirit & enterprise!

[CrAzY dRiVeR]

Four forward and four reverse gears!

Hearing something like this for the first time, though I've heard some two wheelers like the Honda Goldwing having a reverse gear to aid backing it up - but why would a bike need four reverse gears?

Can anyone throw some light on this?

[blackwasp]

Originally Posted by shashanka

I recieved the following in my in-box from MotorBeam last night. I don't know if it has appeared in our forum before, but I felt it to be a worthy inclusion!

Good to see such developments!

Originally Posted by CrAzY dRiVeR

Can anyone throw some light on this?

I'm guessing he used a 4-speed box with another gearbox after it that can change direction of the output shaft. Hence the 4 reverse gears were a byproduct rather than a design. I'm guessing it would have been easier to do this than modify a bike gearbox to include a reverse gear.

The reverse gear in Goldwing is just a clever use of the starter motor moving in the other direction. Not sure if the newer ones with the DCT use the same or have an actual reverse gear in the gearbox.

[srini1785]

If I remember it right, this may not be the first time that someone has put a Maruti 800 cc engine in a motorcycle frame. There was someone who had done it earlier and it was also on news. I frankly don't know if it was covered in this forum.


However , if this boy has done all the efforts by himself , including frame building and weight balancing by himself, then surly it is a commendable act. Although not sure why he wants 4 reverse gears

[srini1785]

Here's a link to an earlier thread which has some details.

http://www.team-bhp.com/forum/motorb...gine-bike.html

[shashanka]

Originally Posted by blackwasp

Good to see such developments!
I'm guessing he used a 4-speed box with another gearbox after it that can change direction of the output shaft. Hence the 4 reverse gears were a byproduct rather than a design. I'm guessing it would have been easier to do this than modify a bike gearbox to include a reverse gear.
The reverse gear in Goldwing is just a clever use of the starter motor moving in the other direction. Not sure if the newer ones with the DCT use the same or have an actual reverse gear in the gearbox.

Yes, that's what the chap said - that the same gearbox is used with an intermediate shaft that changes the direction of rotation - tho' why so many reverse ratios is interesting!

The Goldwing solution is intriguing - does the starter motor itself provide the torque to the wheels (again via an intermediate shaft). That would put a huge load on the battery during the reversing manoevre! Marine engines have resorted to the "lost motion" principle of partial rotation of the camshaft (relative to the crankshaft) itself, using bi-directional cam profiles to reverse the engine rotation itself (B & W). MAN had used the principle of laterally shifting the camshaft so that a new set of cams (the reverse cams, so to speak) came into position below the push-rods & the fuel injection pumps in order to reverse the engine rotation.

Tho' that doesn't answer the question of four reverse ratios....