car guy quiz

[cam fan]

my educational background is far from engineering & i would like to know more about engines

can you guys point out what these things are from the LLT v6? THANKS!

[vroomapunk]

Well the entire "A" is your intake manifold. It takes in air and sends it to the cylinders to combust while the injector mixes it with fuel, it comes in through one valve (moved by a cam shaft) then once exploded sends the force through the piston back down (and repeats) the exhaust exits out of the other valve, and out the exhaust manifold to the cats, etc.

B is nothing, and D is the port that the air flows through, it along with A and D are one cast piece

C looks like the wiring harness to a sensor, probably air pressure , since the mass air flow sensor is usually on the intake tube.

dont know F, havent really looked under the hood of a V6 5th gen, or a V8 for that matter.

E just looks like a cover, which is odd for an intake manifold.

Thats what I think.

edit: IROC is right, looking closer C is a pressure tube, not a sensor. just usually dont see that accordion plastic cover unless its on wiring.

[IROCanSS]

A, B, D and E is the intake manifold. Pretty much as the above poster stated. Not to be confused with the "intake" as in what you replace with a CAI.

C is the PCV system return tube. It is NOT a sensor.

[rolnslo]

A, B, & D are the intake manifold. D is one runner that feeds a cylinder. F is nothing more than a large plenum for the PCV line. C is also a PCV line. E is an access panel for the rear of the intake manifold - if memory serves me correctly, there is a balancing butterfly under there to even out air flow between the two halves of the intake manifold.

EDIT: nope, never mind about what's under the access cover. Here's what is actually there.

[cam fan]

WOA! painting it looks killer!

is the intake manifold the "fuel rail?"

[vroomapunk]

Originally Posted by cam fan

is the intake manifold the "fuel rail?"

No, fuel rails allow gas to come from the tank via a pump and fuel lines, the rail itself distributes the fuel to individual injectors, then the injectors "inject" fuel into the cylinder. And it looks like a "rail".

Intake Manifold just handles air.

Back in the day with carburetors, the air and fuel would mix together in the carb/intake and sent as a mixture to the cylinders.

On your car, you can follow each cylinder and find a spark plug and a fuel injector, and see what we are talking about.

[rolnslo]

Originally Posted by cam fan

WOA! painting it looks killer!

is the intake manifold the "fuel rail?"

Originally Posted by vroomapunk

No, fuel rails allow gas to come from the tank via a pump and fuel lines, the rail itself distributes the fuel to individual injectors.

Intake just handles air.

Back in the day with carburetors, the air and fuel would mix together in the carb/intake and sent as a mixture to the cylinders.

The V6 is direct injected. The only thing going through that manifold is air and oil pulled through the PCV system.

[cam fan]

A) Does this picture show 2 air intake manifolds or just 2 air intake tubes?


B) What are the red parts in this picture?


C) Are those lower red parts fuel rails?

[vroomapunk]

Originally Posted by cam fan

Does this picture show 2 air intake manifolds or just 2 air intake tubes?


What are the red parts in this picture?


Are those lower red parts fuel rails?

It does have two separate throttle bodies and two separate intake tubes, but would appear that it is one intake manifold since they are connected.

The middle picture, the red is an intake manifold.

It looks like in the middle picture you can see fuel rails on the side, it is a square shape. Its possible this is just a cover but it could be a fuel rail depending on where ferrari puts their injectors for this engine.
looking closely, you can see four "things" under the rail, probably injectors, and what looks to be a pressure valve on top, commonly found on fuel rails.

Lower part of lower picture is just a valve cover that you are talking about, just covers the lifters and rocker arms that control the valves.

[cam fan]

wow thanks guys -very informative!

[cam fan]

why does this part need to be covered?

[rolnslo]

Good question. Could have been something to do with the manufacturing process or who knows what. The LLT intake manifold is a cast part so maybe they needed a way to access the inside for some reason. Obviously I have no clue and no longer have my V6 to take apart and figure out why it's like that.

[CamaroSkooter]

Because otherwise the engine would be sucking in unfiltered air. The reason you have an air filter attached to the front of that intake manifold is to prevent debris from being sucked into the combustion chambers. Imagine a nail from the road being sucked into the combustion chamber, standing on end, and then the piston trying to compress that nail into the cylinder head.

Bad news...

[rolnslo]

Originally Posted by CamaroSkooter

Because otherwise the engine would be sucking in unfiltered air. The reason you have an air filter attached to the front of that intake manifold is to prevent debris from being sucked into the combustion chambers. Imagine a nail from the road being sucked into the combustion chamber, standing on end, and then the piston trying to compress that nail into the cylinder head.

Bad news...

Um, completely different than what I interpreted the question to be. I assumed he meant why did the cover even exist and what was the point of the access location.