Heui Systems Flashcards
Instead of a camshaft HEUI systems uses what
High pressure oil fir actuation of injector, can achieve high injection pressure at any rmp
High pressure oil pump can increase oil pressure up to what?
4000 psi
What is an intensifier piston
Multiplies the pressure of oil 8-1 to pressurize fuel to injection pressure
What is pilot injection
Small injection takes place 8-10 degrees before main injection
What is the low pressure fuel supply regulated to?
30-80 psi
How is heui A identified.
Black solenoid not capable of split injection
How is heui B identified
White solenoid and can do split shot injection
How is gen 2 injector identified
Dual coils one for open one for close and 4 pin connection
What are the components of heui A & B
A solenoid- 110v-115v DC to energize
A spill control valve
Intensifier piston 8-1
Nozzle assembly- 2700 psi early
5500 psi later model
What are 2 factors In a heui system that affect plunger travel?
Solenoid activation time and oil pressure
Higher pressure=faster travel
Longer activation= longer travel
How is timing controlled on a heui system?
Controlled by your ecm using your cam and crank sensors. Ecm controls solenoid which controls spill valve
What is digital control valve?
Valve tech that replaced poppet valve. Either opened or closed
Your digital control valve is controlled by what?
2 solenoids
1 opens
1 closes
