The Official Pune Offline Meet(G2G) Thread

[shrinathrao]

Kya hua itna sannata kyu hain thread pe?

[trustvishwas]

Thanks guys for making my Leh travelogue a hit. Crossed 33,000 views.

[shrinathrao]

Thanks guys for making my Leh travelogue a hit. Crossed 33,000 views.

Hey man your travelogue is really the best.

[trustvishwas]

Hey man your travelogue is really the best.

Thanks for the compliments

[shrinathrao]

Niks- Hope you will be a good host in serving everything for free today

[trustvishwas]

Niks- Hope you will be a good host in serving everything for free today

Even if he is a bad host but serves free food & drinks, it is ok with me.

[utsavchs]

ROFL!! Free Drinks!! Free Food!! Kool

[ROCKRZ]

sleeping beauties, please wake up....

btw, the new chapter of the goa ride is up. link is in my signature...

[alankarmisra]

Shameless plug

OT (aka Shameless Plug). I've added a few chapters to my Leh blog (to those who have read it). To those who havent, you can read the blog here:

http://www.xbhp.com/talkies/tourer/13531-leh-diaries-2010-my-journey-into-childhood-dream.html

[trustvishwas]

Is this thread dead? Has someone called a doctor? Ambulance? Anyone....

[antz.bin]

Is this thread dead? Has someone called a doctor? Ambulance? Anyone....

Seriously.. staying On Topic is very very boring.. this is worse than when MG locked the thread.. People!! Please come back!! Lets make the thread Pune Off-Topic discussion thread.. then maybe people will come back. We can start by discussing why GW250 will sell more than CBR250R even though the former is not full faierd, ugly, heavier and more expensive.

[Alibaba]

Well, I wanted to start a topic on general question answers long back but did not find time to get all the questions in one post and put it up here. I will be posting questions that I need clarification on and these would be about bikes only These questions might sound dumb to some but they are just a noob/non-technical person's thoughts. I know most of those things could be looked up on the net for answers but I thing its better to ask the bikers here rather than lookup on the net. Questions:

1. What does the term engine capacity(cc) associate with? What is it that we measure with that unit?
2. The RPM that we see on the RPM meter is rotations per minute of what? Of the wheel? or something else?
3. There is usually a misconception about 2-stroke engines to be less efficient compared to 4 stroke engines. Is it true? If true, why?

More to follow...

[shrinathrao]

adding to what alibaba has wrote, i also wanted to ask whether adding projectors on HID makes a huge difference in the range or not?

Secondly how much does a projector costs?

[satyenpoojary]

1. What does the term engine capacity(cc) associate with? What is it that we measure with that unit?
2. The RPM that we see on the RPM meter is rotations per minute of what? Of the wheel? or something else?
3. There is usually a misconception about 2-stroke engines to be less efficient compared to 4 stroke engines. Is it true? If true, why?

More to follow...

Did you not attend the 'gyaan' g2g that we had in MotoCafe?
These 3 questions were specifically answered there.


Dr. Antz please do the honours! or it would be cool if someone who attended it tries to answer this

adding to what alibaba has wrote, i also wanted to ask whether adding projectors on HID makes a huge difference in the range or not?

Secondly how much does a projector costs?

Range of the beam..? yes it does
Cost varies... from free to around 4k for basic ones

You simply needed a better HID man...

[ROCKRZ]

Well, I wanted to start a topic on general question answers long back but did not find time to get all the questions in one post and put it up here. I will be posting questions that I need clarification on and these would be about bikes only These questions might sound dumb to some but they are just a noob/non-technical person's thoughts. I know most of those things could be looked up on the net for answers but I thing its better to ask the bikers here rather than lookup on the net. Questions:

1. What does the term engine capacity(cc) associate with? What is it that we measure with that unit?

the cubic capacity of an engine is the volume of the combustion cavity inside an engine. (the cumbustion cavity is the volume between the piston and the head)

to illustrate this, if you have a 50mm diameter piston, moving up and down by 100 mm (this is called as stroke), the volume that this 50mm piston will displace while moving 100 mm is
volume (cc) = ( pi/4 x (square of diameter in centimeters) ) x stroke of piston in centimeters
=3.14/4 * 5 * 5 * 10
= 196.25 cubic centimeters.
the Cubic Centimeters is also called as CC in short form.
2. The RPM that we see on the RPM meter is rotations per minute of what? Of the wheel? or something else?
it is the rotation of the crankshaft.
3. There is usually a misconception about 2-stroke engines to be less efficient compared to 4 stroke engines. Is it true? If true, why?
it is both true and false.
true because in the real world, to allow the 2 stroke engine to function, some port overlap is required. this causes some of the charge (fresh fuel and air mixture) to go waste. this causes low efficiency..
the cesond reason is that generally, a 2 stroke engine is setup for peak rpm power. whereas, in the real world, we use it in the lower rpm. this is something like using the engine for a purpose it is not originally designed for.

the statement that "2-stroke engines to be less efficient compared to 4 stroke engines" is false when you design the engine with minimum port overlap. the mechanical losses in a 2 styroke engine are very low. infact, if you compare a 2 stroke engine with a 4 stroke engine, there is only 1 part that is producing the power.. the piston.. whereas in a 4 stroke engine, you have the piston, timing chain, cam, tappets, valves, seals and many more components to assist the power production. This causes more mechanical losses for power transmission.


to understand this in depth, you need to understand that the 2 stroe engine was developed especially as a light and powerfull power source for motorcycles. when it was developed, fuel was dirt cheap so noone cared about efficiency, simplicity was the prime concern. but as the fuel rates rose, the need for a more fuel efficeient power source was required. on analysis, it was found that the problem was with the combination of the intake and exhaust stroke which caused the charge to go waste hence, the 4 stroke was developed where, the intake and exhaust stroke could be seperated. hence the 4 stroke was always fuel efficient as compared to 2 stroke, since it was the only reason why the 4 stroke was made.

More to follow...

yipeeee... something that is ot but not yet ban-able


my answers in bold

btw, these days, research is on in making the 2 stroke efficient but with the emission norms gettig stricter, its unlikely if they can make a comeback.