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

Improvement of Performance

Reduce resistance during suction – Air Filter

Improvement of Performance

Reduce resistance during suction

– Carburetor

Improvement of Performance

Air in

ThrottleAir + Fuel

Reduce resistance during suction – Intake Manifold

Improvement of Performance

Reduce resistance during suction – Inlet Valve

Improvement of Performance

Patm Pint < Patm

Intake manifold

Reduce resistance during suction – Valve Lift

Improvement of Performance

Reduce resistance during exhaust – Valve Lift

Improvement of Performance

Reduce resistance during exhaust- Manifold

Improvement of Performance

Reduce resistance during exhaust – System

Improvement of Performance

Proper Valve Timing – Longer Opening and Closing Timing

Improvement of Performance

Improvement of Performance

Cool the air before allowing it to enter the cylinder

ρair

Improvement of Performance

Fuel Injection: do away with the carburetor

Improvement of Performance

Increase the compression ratio

Improvement of Performance

Increase the engine displacement: more power

IP =

Improvement of Performance

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)

FAQ

(a)

(b)

(c)

(d)

FAQ

(a)

(b)

(c)

(d)

Thanks