What is Engine Knocking? | How to Fix it in Hindi
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- Опубликовано: 24 дек 2018
- Knocking is a phenomenon of generating unwanted pressure wave which create unpleasant sound and can damage engine wall during combustion in engines. Knocking is largely associated with SI engines. It occurs due to self-ignition of unburned charge into combustion chamber.
Knocking is mainly associated with SI engines. It depends on auto ignition quality of fuel. The higher auto ignition temperature causes lower down knocking tendency. To understand whole concept of knocking let’s look out the combustion process.
When the piston reaches at TDC after compression, the spark plug produces spark which ignite the compressed mixture and starts the combustion process. It ignites only those part of mixture witch is in contact with spark plug and generates a main flame front which further ignites the whole mixture. This will generate a high temperature and pressure force inside the cylinder. This burnt part of mixture (combustion products) separate the fresh mixture from spark plug to the other end of the cylinder. As this flame front expands, it compressed the unburned part of the charge. This compression increases the temperature and pressure of unburned part of mixture. If the temperature of this part reaches its auto ignition temperature, it will ignite from other end and a new flame front starts moving towards opposite direction of main flame. When both of these flame fronts collide, it will generate a high pressure wave which produces an unpleasant sound and also damage the cylinder wall.
Factor affecting knocking:
Density factor:
The lower dense charge generates low energy and lower rise in temperature thus avoid knocking. If the density of charge decrease, will decreases the knocking tendency. The factors which affect the density of charge are as follow.
Compression Ratio
Increase in compression ratio will increase density of charge thus increase knocking tendency.
Mass of the charge induced:
The mass of charge depends on throttling or supercharging. A reduction in mass of induced charge, reduce the knocking tendency.
Time Factor:
The lower the time available to auto ignition will decrease the knocking tendency. The most affecting time factors are
Engine Turbulence:
Turbulence reduces the ignition lag or time available for auto ignition. So increase in turbulence will increase the main flame speed and reduce ignition lag, thus reduces knocking tendency.
Spark Plug Location:
To reduce time available for auto ignition, spark plug should locate in order to have minimum flame travel for proper combustion. Generally spark plug located at center to reduce the tendency of knocking.
Engine Size:
As the engine size increase will increase the flame travel thus increases knocking tendency.
Combustion Chamber:
Combustion chamber design play main role in flame travel. The more compact the combustion chamber has minimum flame travel distance thus reduce knocking tendency. Also, the hot spot in combustion chamber should be avoided which can ignite the charge.
Temperature Factor:
Any factor which increases the temperature of inside gases will increase the knocking tendency. These are
Inlet Temperature of Mixture:
More the inlet temperature of mixture, increase tendency of auto ignition thus increase knocking tendency.
Supercharging:
Supercharging increase both mass and temperature of inside the cylinder thus increases tendency of knocking.
Temperature of Combustion Wall
It will play main role in knocking. The higher the temperature of wall, more chance of auto ignition, thus more chance of knocking.
How to fix knocking:
We have known about knocking phenomenon and factor affecting it. The most methods are used to avoid knock are as follow.
Spark plug location should select to minimize the flame travel distance.
By proper cooling of Engine wall.
Combustion chamber is so design which has less hot spot and higher turbulence.
Uses higher auto ignition temperature fuels or add additive in gasoline to increase its knocking temperature.
Higher engine speed will reduce knocking.
Reduce compression ratio.
Reduce supercharging to avoid knocking.
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जबरदस्त explanation किया भाई अपने। वाह ❤️
Very deeply knowledge has provided by you. Thx a lot for this.
Can you please provide an answer regarding the engine noise that appears when we ride in high gear and low speeds???
Is it the sound from the discrepancy in clutch plate?.....or is it due to knocking?
Explained nicely and very deeply
👍👍
nice explanation..you re doing great!!!!
Thanks for appreciating the work 👍
You are great teacher
Very nice.... Make more videos....
Sir my Honda cb shine makes rattling noise from engine. Give me some suggestions if possible.
Knocking,,, tech wise a comprehensive video. It is applicable more for manufacturing companies to improve combustion process so as to minimize knocking.
But practically if faced with knocking, what precautions owner has to take n what is to be done by a mechanic, is not explained.
Very good teaching
But sir, this is general automobile explained. But in my Unicorn bike there is a slightly extra noise coming near spark plug, this sound is not regular. I'm don't think it's that knocking which is explained in video. We can figure out the knocking awaz only if keenly abserve in my bike.
Sir plzz reply i recently did valve clearance but my sound stop but after that there is sound come when accelerate from.clutch shoe side engine
I have a question
Can we add 2t oil into fuel tank in petrol engine ?
Is this decrease knocking problem in petrol engine ?
Please help me bro, my tvs jupiter knocking problem, weired sound like kat kat kat from engine, no showroom mechanic was able to fix it, hepl me bro🙏
Sir. I bought a dio clocked 21000 kms of 2014 mnfgr. In my honda dio, i get '' dhag, dhag '' sound when accelerated. Whether it is knocking sound? Plz advise.
explained very nice
Thanks
Helpful video thnx
U r welcome 😊
Nice experience bhai👍👍👍👍👍
👍
Best video
Thanks great vedio
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Wo like kare
#SuperHitTVR
thanks
Good video...
Sir ye possible ways hey kya jisse knocking over control ho sake
How resolve Noking problems in Hero duet scooty
Super splendor Bs6 model bike band Karne ke baad thore time tak kit kit ka awaj aata hai koi problem hai engine me Kya?
Ye sahi hai, but i am facing knocking problem in Honda hornet from 1 month how to fix it ... Please help
Tnx sir
Good video
Thanks ji
Nice video sir
Welcome 😊
Woww even girl watch automobile topic videos. Lol...
bro iska simple solution hai ki increase the spark gap of the spark plug or use more spark plugs like 2 are used in royal enfield twinspark engine
Sir plz is k ilawa koi or bhi solution btao bike k liye jis sa acceleration k time hony wali knocking na ho
Bhai bohothi acha video tha par aap ise aurjyada ditels mesamjate ki engine tarbulens aur auto egnition kaise hota hai esi choti choti baaton ko aap samjate to achahota
Good
NYC video
Thanks :)
C.I engine ka cmprsn ratio jyada hota h to usme jyada knoking honi chahiye .aur ap start me bole ki S.I engine me knoking jyada dekhi jati h
nyc video
Thanks
Nice
Thanks 😊
super
upload too many videos
I will upload more videos
Thanks for appreciating the work
Sir can you please tell me about this thing,
My bike was just standing in lockdown and didn't move for 3 months
When i tried to start it,it did not start, now mechanic is saying it is not creating compression which is necessary to start.
He suggested me to push and start i tried 4 to 5 times but it didn't work out.
Please help?
There should be problem in air intake pipe
@@MECHANICALTECHHINDI
Thanks
Problem was with fuel intake.
Fuel tanks motor was unable to supply /(or push petrol into)the fuel into fuel injector which causes combustion.
meri dual vvti corolla 1.6 D gear ma kr kr kr sound ati ha start ma low rpm per pick krta hn phir sound gayab hojati ha bhai ya kya masla ha
Try premium fuel or shell fuel, I'm sure the knocking will be solved.
waise bro apne automobile engineering ki thi kya?
Hello bhai give me 💓 I am your first viewer
Thanks a lot #Waris bhai
Bro Awesome
Thanks
Koi batie ga kise fix Kare knocking ko
Bad map sensor ki wajah se v Knocking ho skta h kya
Yes
jis fuel ka auto ignition jada hota hai wo kam knock karta har . disel ka auto ignition temp petrol se kam hota hai toh uss hisaab se c.i engine min knocking jada honi chahiye par hoti s.i engine min jada hoti hai
Thanks for my clearing confusion
Welcome
Yeh Poora problems, India may mujhe kaun solve karegaa😭😭😭😭😭
3:30 Kwid users pay attention.
I Have Platina 110 h gear 2019 model. Meri Bike jab heat hoti hai to acceleration ke time engine Se knocking ki sound aati hai Kya problem Ho sakta hair
Please Reply
mathods to reduce knoking 11:18
Nice explanation
👍👍👍
Eingen se speed bdane pr knoking jesi aawaz aa rhi h
Bike ko fast speed krte hai accelerator lekr to tan tan ki aawaj aati h normal se speed krte hai yaa bike pr jor nhi dete h to aawaj nhi aati hai. Bs jor lagane pr awaj aati hai 🙏😢
Works of fl flywheel
Flywheel ke working ke uper video banaye hai aap wo video channel me ja ke dekh sakte ho
Sir ji spark plug kewal petrol engine me hota h
Ha spark plug ko petrol engine (SI engine) me use kiya jata hai
Thanks
U r welcome
इसका मतलब डीजल इंजन में knocking की समस्या नहीं होती है....?????
Low sound
Kooma vedio hai
bole to
Jakhas
👍
At 6:12 the note is incomplete
Itni jyada HAI HAI HAI.. kan me Knocking creat kar Raha HAI..
PLEASE USE LESS HAI WHILE ARTICULATION
3 times ads. 😬
Fudu machanic desale ingen vich injacter vi honde a
Gadi band hoti he phirbhi knocking hota he
Knocking nahi hota hai
Wo silencer se awaaz aata hai
@@MECHANICALTECHHINDI
TX sir me tumche dararoj video bagto aani me mechanic engineering kartoy sir
Hehehehe this is normal bro. It's silence metal heated sound.
It's nice not NYC
👍
Its better to drive electric
👍
@@MECHANICALTECHHINDI hahah app hi boliya
Good video
Thanks 😊