Cruise - getting best mileage
Thread Starter
Evolving Member
Joined: Sep 2008
Posts: 318
Likes: 0
From: Czech rep.
Cruise - getting best mileage
Hi,
I know it has been discussed that increasing timing in cruising (20-60 load cells) helps the mileage.
I would like to ask about another possible influence - MIVEC. I consider setting low advance (like 10) on the intake valve and higher retard on the exhaust walve (-20?) to het higher EGR and to increase mileage due to less air (and less gas as well) but keeping high pressure due to exhaust gasses sucked into combustion chamber.
Is this idea wrong?
I know it has been discussed that increasing timing in cruising (20-60 load cells) helps the mileage.
I would like to ask about another possible influence - MIVEC. I consider setting low advance (like 10) on the intake valve and higher retard on the exhaust walve (-20?) to het higher EGR and to increase mileage due to less air (and less gas as well) but keeping high pressure due to exhaust gasses sucked into combustion chamber.
Is this idea wrong?
Nope. Try it out and see if it works for you.
Valves go like this:
Exhaust
Intake
So if you retard the exhaust and advance the intake, you will cause more overlap. This overlap will cause the exhaust gases to go back into the intake manifold and then back into the engine. This will lower the vacuum in the engine allowing it to run more efficient (it doesn't have to draw against vacuum, which is a huge resistance).
Valves go like this:
Exhaust
Intake
So if you retard the exhaust and advance the intake, you will cause more overlap. This overlap will cause the exhaust gases to go back into the intake manifold and then back into the engine. This will lower the vacuum in the engine allowing it to run more efficient (it doesn't have to draw against vacuum, which is a huge resistance).
Thread Starter
Evolving Member
Joined: Sep 2008
Posts: 318
Likes: 0
From: Czech rep.
Nope. Try it out and see if it works for you.
Valves go like this:
Exhaust
Intake
So if you retard the exhaust and advance the intake, you will cause more overlap. This overlap will cause the exhaust gases to go back into the intake manifold and then back into the engine. This will lower the vacuum in the engine allowing it to run more efficient (it doesn't have to draw against vacuum, which is a huge resistance).
Valves go like this:
Exhaust
Intake
So if you retard the exhaust and advance the intake, you will cause more overlap. This overlap will cause the exhaust gases to go back into the intake manifold and then back into the engine. This will lower the vacuum in the engine allowing it to run more efficient (it doesn't have to draw against vacuum, which is a huge resistance).
