The Official Pune Offline Meet(G2G) Thread

[antz.bin]

I asked a question too! just a tad bit late! Engineers, please reply!
Though I know some of the basic answers which would say Vibration, (mis)use of torque to compress the spring rather than channelize it to the crank etc.. but think about it

Edit: PS: I would love to read the tiffin box analogy! Please go ahead!

Good question.. actually what you have asked is exactly what happens inside one of these.


But the problem with using this setup would be that the energy produced in the blast will be used to push the piston up faster only once.. rather than rotating a crank 2 times. (The spring will just push the piston up.. and make it stay up). Though a similar principle can be used in a 2-stroke engine and hence eliminate the requirement of a flywheel just to bring the piston back up. The problem with this of course is that if the spring fails / breaks / snaps, the engine breaks down. And the possibility of this happening is higher than that of the flywheel malfunctioning ( purely because there is no moving part... it is just a block of metal). Basically the spring will do what the flywheel does in a 2S motor. Only the setup will become less reliable and more lighter(in terms of weight).

Edit: The picture is of an AK-47 Rifle

[trustvishwas]

I would now suggest that the googled explanations stop...

Edit: I am mailing Alibaba a copy of the PPT used on that day. I would suggest you to go through it thoroughly first and then ask any further doubts regarding what you did not understand. The presentation is quite thorough and should clear most doubts.

Can you mail the ppt to me also?

[antz.bin]

Can you mail the ppt to me also?

Mailing it to the hotmail email address mentioned on your FB page.

[satyenpoojary]

Ah! Interesting, then lets make it a hydraulic shaft rather than the spring, and lets still use the flywheel with the weight to pull it down

(I know where this is going now though :P)

and please add that tiffin analogy here!

[surojit]

Can anyone lend me his bike for this weekend....? i just need it for commuting... need to give my bike for servicing....

[antz.bin]

On deep thought over the tiffin box analogy.. it would be oversimplistic.. but I am still working on it. Also.. I have very little idea about how Hydraulics work

[Alibaba]

sorry i know only about two strokes as i worked more with them.

Forgive if answers are wrong as i am a non engineer

A simple relation betwen power, torque, rpm would be

power= (2*3.14*N*T) /60000 (Kilo Watts) So, we cannot say that 150cc enginer should have nearly same power and torque output. But there is an interdepndancy among them . And I had done an interesting project in final year where in I had analyzed different performance characterstics of an engine using artificial neural networks . Sounds fuzzy but I still posess the reports which gave us a a nice insight of how this thing works.

And in two stroke engines fuel efficiency is a little low when compared to 4 stroke ones. Still there are methods by which you can have an optimal fuel efficiecny too. Like we had supplied pre-heated air to the carb by utilizing the heat of exhaust . And then went on decreasing the Air/Fuel Ratio until we found that it was not affecting the engine i.e by producing deposits etc.And finally on a 5 speed RX we were able to get Fuel Efficiecy of 42 kmpl. But the best part is carb got screwed in a day Still figuring out the reasons.

BTW there are these two books on IC engines.

One by Mathur and Sharma , Ganeshan. These give you a very basic idea about what engines are about. But only theoritically , for practical experience we have to just stand by it listen to it and analyze .

Thanks for the answers guys! Trying to grasp as much as I can

I would now suggest that the googled explanations stop...

Edit: I am mailing Alibaba a copy of the PPT used on that day. I would suggest you to go through it thoroughly first and then ask any further doubts regarding what you did not understand. The presentation is quite thorough and should clear most doubts.

Thanks for the ppt Antz! Will need to get some doubts cleared from you on some offline G2G

The first person answering your question gave you more information than you asked for.

When we talk about the CC, we refer to the amount of 'charge' that a cylinder accomodates for.
So a 150CC 'engine' is referred to as a 'cylinder' which holds the fuel + air in its 'VOLUME'
The jazzy mathematic formula is for the 'Volume' of the Cylinder

Imaging a cylinder with both its end open... you obviously cannot hold any charge in there... hence the measurement accomodates for the piston which is on one end of the cylinder.
This is what my expert friend Shrinath wrote as the The Bottom Dead centre.

The other end is closed by the 'head' (for now just remember it as a closed head)


For the second confusion, just like Rockrzz, me, antz and Shrinath have identical head size (the human head) it does not mean they churn out the same amount of 'power' each head is different. My head is mostly vaccant, whereas Shrinaths has more brains\muscles.

To put is simply Power - Is not a direct indicator by the size of the cylinder.

Power generated by the enging is what Rockrzz = BMEP x RPM

BMEP is nothing but the power that piston has been exposed to due to the blast in the charge.

RPM - Already clarified. This blast pushes piston which is attached to the rocker arm which pushes the crank and so the circular rotations per minute.

(Not an Engineer, But a certified googler from the University of Mr. Saikamaldoss)

PS: Chevy? Seriously?

PPS: A noob question.
If someone said that energy cannot be created or distroyed , but can simply take another form then:
1) What would happen if in the cylinder, along with the connecting rod the piston has spring attached to it somewhere on the end of the cylinder to hold and harvest the power?
This question might be stupid (and I have many more stupid questions) but I could never get in thru the hardships required to 'qualify' for engineering... hence couldnt ask it to any! ..

Nice explanation with some humour to it Btw who is Saikamaldoss? I remember reading this somewhere else too. Not sure where

[shrinathrao]

if anyone can do a DIY for the same thing it would be great

[antz.bin]

I got the simplest answer to Alibaba's q1 !!!

cc = ml (milli-liters)!

so cc is the amount of ml of water you can fill in your bike's engine's main cylinder. So, it is the "Engine Capacity" to fill water / air / air/fuel mixture. More air/fuel mixture = more potential of extracting power / torque.

So.. Engine capacity of

is


And engine capacity of

is


@Satyen Pondering over your query.. All you are doing is adding weight, increasing moving parts and increasing frictional losses in the hydraulic shaft (Yes I googled it!).

[dual disc 200]

But that's just 500ml rite

[antz.bin]

But that's just 500ml rite

Buddy.. pick up a bottle from a nearby store! 100ml free on all 500ml bottles! They are all 600s !

[nitrosatya]

Wassup everybody??? Lets meet up sometime this weekend!!!

[Sharan_R]

Are you planning to make a visit to pune so i can ask you some more details about HID and where to procure from in pune as the real test of HID is only at night and when we actually ride.

Oh! You're still in a dilemma?
As I said, Get a Good one from Pune. There are lots of places from where you can. Or as I suggested source it from Navnish(Bangalore xBhp). He has it stored with someone at SB road. I have his number.
Or if you can, get it by yourself, get a H4 34W-40W Single Beam/Bi-Xenon 4300K at your Low Beam/High Beam!( Preferably with so called "Warranty") Single Bulb should suffice and does the Job unless you're concerned about "Looks".

Stop thinking about it so much. Source one, Plug it. Score!

Better if you can Set up Projectors. And, it will be Legit!

[antz.bin]

Oh! You're still in a dilemma?
As I said, Get a Good one from Pune. There are lots of places from where you can. Or as I suggested source it from Navnish(Bangalore xBhp). He has it stored with someone at SB road. I have his number.
Or if you can, get it by yourself, get a H4 34W-40W Single Beam/Bi-Xenon 4300K at your Low Beam/High Beam!( Preferably with so called "Warranty") Single Bulb should suffice and does the Job unless you're concerned about "Looks".

Stop thinking about it so much. Source one, Plug it. Score!

Better if you can Set up Projectors. And, it will be Legit!

He already scored.. Saw it in action 1 hour back at Roopali..

[satyenpoojary]

I hope he bought the HID with a housing on the lamp that bounces the light back to the reflectors

@Antz. Nice but dont end it there... Why do we call is frictional loss, when energy cant be lost