Page 13 - E BOOK ENGINE MECHANICAL M2

2. MIVEC ENGINES

1. GENERAL
The Mitsubishi Innovative Valve timing Electronic Control (MIVEC) system engine has been devel-
oped with the aim of achieving high power output, low fuel consumption, and low exhaust emission.
The system optimally controls valve timing and the amount of valve lift in accordance with the opera-
tional conditions. MIVEC is the general name for all engines equipped with the variable valve timing
mechanism developed by Mitsubishi Motors. The MIVEC system is classified into 3 types based on
their mechanism features as follows.

1. Continuous variable valve timing MIVEC system
2. Switching valve timing and lift MIVEC system (intake side only)
3. Continuous variable valve timing and lift MIVEC system

Applicable Engine Camshaft
Type Features of Mechanism
Model layout

1. Continuous variable - Varies each intake and exhaust
valve timing MIVEC 4B1series (up to 2011) DOHC valve timings respectively and contin-
system
uously
4A9 series
4B1series DOHC - Varies the intake valve timing only
(2012 and afterward)
2. Switching valve tim- 6B31
ing and lift MIVEC - Changeover the operational intake
system (intake side 6G75 SOHC cams between the low speed one and
only) high speed one
4G69
3. Continuous variable - Varies the intake valve timing and
valve timing and lift the its valve lift amount continuously
MIVEC system
4J1series SOHC - Varies the intake & exhaust valve
timing simultaneously and continu-
ously

2 - 1 Pub. No. PTAE1225