our engine is four stroke engine:
1. air/fuel mixture intake
2. compresion of air/fuel mixture
3. ignite by spark plug and explosion
4. exhaust the waste
in the first stroke, air fuel mixture is being sucked into engine. how did this happen? let's focus on the number 1 cynlinder in our car:
While cynlinder 1 exits the forth stage (exhaust) that will push most the air out of the cynlinder. Then because of the inertia it the crack shaft will keeps on rotating and pulls the piston away from it's highest point. So at this moment it will create a vaccuum in the combustion chamber as well as intake manifold.
If the car is under wide open throttle, which means the throttle plate is wide open and create an equal pressure in the intake manifold compare to atomic pressure (in natural aspirated cars). In turbo/super charged cars, it will create a positive pressure because the intake system is pressurized.
I hope this will clearify why it's under vaccuum. Post up if you have any questions.
Tiger
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MODS:
NOS Octane Booster
Stickers, those 5+ hp ones, lots of them!!!!
RAPOM +33% long throw shifter
K&N steam air intake system, complete
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