SI/CI Engine Start Technology

Why we do not use same technology to start both SI/CI engine?

Showing Answers 1 - 7 of 7 Answers

chemet rigzin

  • Feb 21st, 2016

In Si engine air and fuel mixture is injected during intake stroke, qnd combustion takes place, but in Ci engine only fresh compressed air is pushed into the chamber, and fuel is introduced for combustion during intake stroke.due to the different fuel types, and different operating temperatures, different technology is used to finally push the crank and finally move the vehicle

  Was this answer useful?  Yes

ranjan Kumar

  • Feb 21st, 2016

Because in both we use different fuels which have different ignition system

  Was this answer useful?  Yes

mandar hukeri

  • Mar 4th, 2016

Because both the engines use different fuels, and both the fuels have different properties eg: Flash point, fire point, auto ignition temperature and many more so a designer considers the properties of which kind of fuel is been used in engine.

  Was this answer useful?  Yes

Because the calorific value of petrol is higher than the calorific value of diesel. Temperature of compressed air itself is sufficient to burn the diesel. However diesel engine has high compression ratio than petrol engine.Fuel injection system is costly. That is why we are using different technology in SI & CI Engine.

  Was this answer useful?  Yes

Engineering on Softwares

  • Mar 17th, 2016

In SI engine we use spark plug for ignition but in CI engine fuel get ignited by cylinder temp. So cause of different type of fuel and different type of fuel injection in cylinder we have to use different technology to start both type of engine.

  Was this answer useful?  Yes


  • Mar 29th, 2016

Because diesel ignite by air pressure in cylinder and also low calorific value so we cannot use spark pluge in the CI Engine

  Was this answer useful?  Yes

H G Luhar

  • Apr 4th, 2016

Auto ignition temp of petrol is higher than diesel

  Was this answer useful?  Yes

Give your answer:

If you think the above answer is not correct, Please select a reason and add your answer below.


Related Answered Questions


Related Open Questions