engine performance improvement

Engine Performance Improvement

Prof. (Dr.) M P Poonia Director

NITTTR, Chandigarh

Actual P–V Diagram

PMEP

Indicated Power (IP)

IP =

IP = Where, IP = Indicated Power, W Pm = Mean Effective Pressure N/m2

L = Stroke Length, m A = Piston Top Area, m2

N = Engine RPM

Reduce resistance during intake and exhaust stages: multiple valve configuration

Cool the air before allowing it to enter the cylinder

Fuel Injection: do away with the carburetor >>>

Improvement of Performance

Increase the compression ratio

Increase the engine displacement: more power

Compress more air into the cylinder during intake: using supercharger and turbocharger


Reduce resistance during suction – Air Filter


Reduce resistance during suction

– Carburetor


Air in

ThrottleAir + Fuel

Reduce resistance during suction – Intake Manifold


Reduce resistance during suction – Inlet Valve


Patm Pint < Patm

Intake manifold

Reduce resistance during suction – Valve Lift


Reduce resistance during exhaust – Valve Lift


Reduce resistance during exhaust- Manifold


Reduce resistance during exhaust – System


Proper Valve Timing – Longer Opening and Closing Timing



Cool the air before allowing it to enter the cylinder

ρair


Fuel Injection: do away with the carburetor


Increase the compression ratio


Increase the engine displacement: more power

IP =


Compress more air into the cylinder during intake: using supercharger and turbocharger.

FAQIndicated Power of a 4 – stroke engine is =a) pmLAN b) 2pmLANc) pmLAN/2 d) 4pmLANwhere pm = mean effective pressure,L = strokeA = area of piston andN = rpm of engine

FAQ

If the intake air temperature of an I.C. engine increases, its performance willa) increaseb) decreasec) remain samed) none of the mentioned

FAQ

(a)

(b)

(c)

(d)

Thanks

engine performance improvement

Automotive