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**srini** · 08-22-2009, 03:46 PM

Originally posted by pradeep reddy View Post

know the basics of four stroke engine and even can find the faults but still not able to fix them due to lack of practical knowledge...

same here...
too much technical knowledge but I haven't tried anything as of now...

**koolbhas87** · 08-27-2009, 08:21 PM

Its really a good topic...b4 i knew very few abt my swthrt....i started googling...nd found many stuffs.....thnx bro..4 starting a topic like dis.......

**yashdiep** · 08-27-2009, 10:10 PM

Damn!! Too good stuff.. Nice post dude! Cheers...

**Samarth 619** · 08-27-2009, 11:14 PM

I knew how the engine works, thanks to Bike India, internet, etc. I'm gradually learning.

But, Learning is a process that should never stop. So, I WILL check out these links ...

Thanks Kishan for posting it...

**diffuser911** · 08-28-2009, 08:25 PM

Originally posted by pali View Post

Know it all..hehe yea im boasting..

Well i recently took a course called 'Fundamentals of Automotive engineering'
so i got ot know everyting from the engines to the suspension to even the hvac..

Do tell where you took this course...lots of us would be damn interested

.

**pali** · 10-07-2009, 06:31 PM

Originally posted by diffuser911 View Post

Do tell where you took this course...lots of us would be damn interested

.

sorry for the really late reply guys..(actually i forgot where this thread was so..)
So this course was offered to a select few as a certification course in my college.. Those who are selected from this course get to be part of a team which is involved in building a racing car(its true!!)..

And if you do want to study off the net then howstuffworks.com is a great site to start off with..

Originally posted by pradeep reddy View Post

where did u attend the course?
know the basics of four stroke engine and even can find the faults but still not able to fix them due to lack of practical knowledge...but somehow learnt to adjust timing,valve clearance and can work on top portion like head and bore but bottom engine i havent touched it though..

I dont have much of practical knowledge.. I have just seen all the parts dismantled(engine,gearbox everything).. I belong to comp.science stream so i dont get to study these things again..only mechanical engineering students have this in their curriculum...

**Divya Sharan** · 09-14-2013, 09:55 AM

Motorcycle engines - how do they work?

Just the other day i was browsing the other BHP forum where I was fascinated by an article on how a car's engine works.
For people who're interested, this is the article - How A Car Engine Works (animated infographic)

I started searching around for something similar for 2 wheelers. I know most of the senior riders would know all of this, but I'm a noob and a newbie. And I want to learn and share.
I'd be sharing stuff in parts and I'd request members to pitch in as well to share the knowledge in the community.

P.S - All data is copied from the internet (source would be mentioned at the bottom of each post) and this is an attempt to put all relevant data in one thread.

An overall diagram for the working of the engine can be understood by seeing the pictorial here: http://http://auto.howstuffworks.com/motorcycle1.htm

Now, the working of the transmission can be understood with this article: HowStuffWorks "Motorcycle Transmission"

Chassis and disc brakes explained here: HowStuffWorks "Motorcycle Chassis"

How a carburetor works:

Since there is a limit of 1 video per post, I'd post the working of a camshaft in the next post.

**The Monk** · 09-14-2013, 12:01 PM

Re: Motorcycle engines - how do they work?

Topic Approved

Good initiative there bro

**snehithpereira** · 09-14-2013, 12:12 PM

Re: How Many Of Us Knowz the WorkiNg of MotorCycle Engine ???

Great start there [MENTION=41586]Divya Sharan[/MENTION] , lots of helpful stuff for curious noobs like me

Sent from my GT-I9300 using xBhp Connect mobile app

**rreneav1987** · 09-14-2013, 12:21 PM

Re: How Many Of Us Knowz the WorkiNg of MotorCycle Engine ???

Originally posted by snehithpereira View Post

Great start there @Divya Sharan , lots of helpful stuff for curious noobs like me

Sent from my GT-I9300 using xBhp Connect mobile app

Same Goes with me too

but how about the FI??

since I ride an FI engine, i would like to know about it... I guess I will check on the internet and see if I can find anything useful

Good job divya

**Divya Sharan** · 09-14-2013, 01:12 PM

Re: How Many Of Us Knowz the WorkiNg of MotorCycle Engine ???

Originally posted by The Monk View Post

Topic Approved

Good initiative there bro

Thanks for the approval sire! I thought it would be a good opportunity to learn together.

Originally posted by snehithpereira View Post

Great start there @Divya Sharan , lots of helpful stuff for curious noobs like me

Mee a noob too.

Originally posted by rreneav1987 View Post

Same Goes with me too

but how about the FI??

since I ride an FI engine, i would like to know about it... I guess I will check on the internet and see if I can find anything useful

Good job divya

Thanks. FI will have to wait. Let me get there step by step. BTW, Honda has put up an extensive report on PGM-FI. I had a long discussion with "icemang" on the CBR thread.

Lets reach there step by step.

How a crankshaft works:

**gyan_recl350** · 09-14-2013, 02:28 PM

Re: How Many Of Us Knowz the WorkiNg of MotorCycle Engine ???

Guys read through the below links, a highly misunderstood concept "Back Pressure" explained:

Back Pressure, is it needed?

Exhaust: The straight scoop on backpressure - DSM Forums

----consecutive posts auto-merged-----

And below is the basic/fundamentals of working of cam and different arrangements. This surely would help a-lot to start off with cam related stuffs:

http://www.youtube.com/watch?v=itE2JWqdTqE

in the same link then you can look out for different cam related videos

**Divya Sharan** · 09-14-2013, 10:35 PM

Re: How Many Of Us Knowz the WorkiNg of MotorCycle Engine ???

Motorcycle transmission explained below:

(Also explains dual clutch transmission seen on Honda VFR 1200.

**gyan_recl350** · 09-15-2013, 12:00 AM

Re: How Many Of Us Knowz the WorkiNg of MotorCycle Engine ???

Though there are plethora of videos available on YouTube but I found the below one to be basic but yet very comprehensive and clear:

Four Stroke Engine How it Works - YouTube

**Divya Sharan** · 09-17-2013, 08:24 PM

Re: How Many Of Us Knowz the WorkiNg of MotorCycle Engine ???

@rreneav1987 - here's something that might be of interest to you. Honda PGM FI explained. Also, there is a PDF file containing error codes from the FI module.

http://www.ej9.ru/civic/book/chpt_03.pdf

Honda Worldwide | Technology Close-up

How it Works: Programmed Fuel Injection (PGM-FI) Technology - Experience Powersports - Honda Powersports

PGM-FI system has a two-split configuration consisting of the throttle body and the ECU module.

Layout of sensors
The throttle body module has 3 sensors in the device body.
1. Intake air temperature (Ta) sensor: To allow measurement of intake air temperature, the sensing tip of the sensor is exposed in the intake air passage before the throttle valve. For down-sizing, the sensor terminals are directly mounted on the ECU board.

ECU module component
2. Throttle position sensor (TPS): Located on the end of the throttle shaft, directly detects the throttle opening. The throttle shaft and the sensor rotor are connected via a spring to eliminate a hysteresis in the operation. The TPS is directly fit into the device body and sealed from outside by potting.
3. Manifold vacuum (Pb) sensor: The sensor terminals are directly mounted on the ECU board, and connected to the connecting passage provided after the throttle valve in the throttle body.

FI system control
The PGM-FI system for small motorcycles controls the fuel injection volume, injection timing and the ignition timing based on signals from the throttle position sensor (TPS) in the ECU module, the manifold vacuum (Pb) sensor, and the crank position sensor that detects the rotation angle. The fuel injection volume, the injection timing and the ignition timing are further compensated by the engine temperature, intake air temperature and the atmospheric pressure to ensure optimum controls under various environmental conditions.

Fuel injection control
For the control of fuel injection volume, two kinds of maps are stored in the ECU and an appropriate map is selected and used depending on the throttle opening and the engine revolutions.
1. When the loads are low, the delicate changes in throttle opening are detected by the manifold vacuum, and the manifold vacuum map determined by the manifold vacuum and the engine revolutions is used.
2. When the loads are high, the throttle map determined by the throttle opening and the engine revolutions is used.

Ignition timing control
For ignition timing, the map control determined by the throttle opening and the engine revolutions is executed to control the ignition timing at the optimum timing.

O2 feedback control
To efficiently use the 3-way catalyst in the exhaust muffler, the feedback system using an O2 sensor is applied to control the mixture near the stoichiometric ratio.

Control of idle air control device
The idle air control valve regulates the intake air volume depending on the operating conditions such as the starting, warming up and idling. When starting, the intake air is supplemented by opening the idle air control valve depending on the engine temperature for easy starting. The opening of the air control valve is regulated depending on the increase of the engine temperatures to control the intake air volume at the optimum level. After the engine reaches the prescribed temperature, the intake air volume is controlled to maintain idling at a constant speed by the revolution-feedback control. This feedback control eliminates the conventionally required idle speed adjustment, thus eliminating the need of maintenance to compensate for the secular distortion.

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Motorcycle engines - how do they work?

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