Engine cover, do we really need it?

[D.FYLAKTOS]

I have that cone now installed, what i don't have is this Γ (45 degrees) shape plastic hose on the right.

[Thefeliciahacker]

On 22/06/2023 at 13:03, D.FYLAKTOS said:

Something is missing at the exit to the throttle or not?

For a second i doubted my whole existence

 

On 22/06/2023 at 14:32, Papez said:

Yes.

Exactly that, the venturi

[D.FYLAKTOS]

2 hours ago, Thefeliciahacker said:

For a second i doubted my whole existence

 

The car was running about 15 years without it.🤓

 

2 hours ago, Thefeliciahacker said:

the venturi

 

Even if we have an aftermarket filter (gauze for example) need it?

[Thefeliciahacker]

It's there to improve performance. 

No matter the filter type. 

[D.FYLAKTOS]

@Papez Here is mine as is now (outside)

 

 

 

That plastic pipe

 

 

is fitted here?

 

 

 

because i have never seen it before.

Edited 24 June, 2023 by D.FYLAKTOS

[Papez]

On 24/06/2023 at 17:33, D.FYLAKTOS said:

@Papez

That plastic pipe

 

is fitted here?

 

because i have never seen it before.

 

I think that's for the warm air intake, I think this is a 1.6 box. The photo is from the internet, It was just best one to show the Venturi tube.

[D.FYLAKTOS]

On 23/06/2023 at 15:32, Thefeliciahacker said:

Exactly that, the venturi

 

2 hours ago, Papez said:

the Venturi tube.

 

I wonder why Skoda make a conical tube (less that 56mm) inside the filter box and in the end of it at 56mm attacked a hose about 65mm and in the end of it drove it to a an Γ shape pipe (inside the plastic cover) and from 6mm make it 56mm in the throttle.

What's the meaning of this whole process?

What's the ''disadvantage'' for the air from 56mm at the filter box to end straight at 56mm at the throttle?

[Thefeliciahacker]

The venturi in the airbox is to create a helmholtz chamber. 

Other than that you want to let the air to travel as slow as possible to have the least amount of losses and then accelerate it near the inlet. 

[D.FYLAKTOS]

5 hours ago, Thefeliciahacker said:

you want to let the air to travel as slow as possible to have the least amount of losses and then accelerate it near the inlet.

 

I wonder the guys which remove the factoty filter-hoses and buy-install filters like this

 

which have the same diameter from A to Z don't have issues with the speed of the incoming air?

 

[Thefeliciahacker]

That's the worse 

[D.FYLAKTOS]

21 hours ago, Thefeliciahacker said:

you want to let the air to travel as slow as possible to have the least amount of losses and then accelerate it near the inlet. 

 

That's for the idle or low rpm or this applies to higher rpm also?

[Thefeliciahacker]

Yes less losses 

[D.FYLAKTOS]

The days of late 80's that i was in school are far away that's why i can't understand why the air from 56mm in the end of the air filter box it cannot be driven at the 56mm of the throttle.

It will lose what? Speed, smooth flow?

No cone tubes, no 65mm hose, no Γ style inside the cover ,no narrowing, just straight ''take and give'' air in the same diameter. 😊

[D.FYLAKTOS]

Same code, one (top) bought in a parts store and the other (beneath) is from an e-store.

 

 

 

Look the same in diameter but as you can see they have a difference in the end.

 

 

 

 

The original seals better with the plastic socket of the air filter and the other of the engine cover.

Plus when it's time to bent it a little bit for some degrees (factory specifications) the original has no problem at all

 

 

 

when the other has, it bent easily and narrows the air flow a bit.

 

 

 

 

Waist of money and time, soon i will replace the after market with the original.

[D.FYLAKTOS]

On 21/06/2023 at 11:28, Thefeliciahacker said:

Its going to speed up the air.

Its just an adapter as the filter box is designed for higher volume engines, needing more airflow and is adapted to the 1.3's tb

 

I have found something, take a look that black tube Γ style.

I wonder, he made it of bought it?

 

 

 

[Thefeliciahacker]

exactly the same as factory geometry

[D.FYLAKTOS]

I removed that plastic cover today, i had to make an experiment.

This is the parts code in case that someone may needed in the future.

 

 

 

I also noticed this prominence inside,

 

 

 

i didn't want this to end-up inside the throttle so i remove it.

More about the experiment (..which failed) soon.

 

 

 

[Thefeliciahacker]

23 hours ago, D.FYLAKTOS said:

I also noticed this prominence inside,

yeah thats from the injection moulding process

[D.FYLAKTOS]

I hate that cover but i had to keep it.

After all these years in the left side has a small gap and makes a noise (like something is uncliped) which makes me extremely nervous but i can not ''copy'' the factory desing whith something else.

[D.FYLAKTOS]

The experiment was i tried to ''simulate' the factory hose and the Γ shape of the factory plastic cover (Yellow line)

 

 

 

with a tube like this

 

 

which is very flexible, and IF the experiment was successful i would replace it with something more robust as a silicone or plastic hose.

After cut it in proper length, make the curb above the throttle and seal it in the bottom to be tight with the throttle body i slowly lowered the hood but there was a touch so i stopped.

For sure i didn't want to lower the hood, squeeze the tube and let it like this, someone may say: yes that's the factory design look, at a spot it's a bit compressed but there is no comparison to a hard factory plastic and a squeezed cheap tube plus every time i was lifting the hood the look of that tube would be bad.

 

So for now i will keep that plastic cover although i don't like it.

[Thefeliciahacker]

7 hours ago, D.FYLAKTOS said:

So for now i will keep that plastic cover although i don't like it

Why dont you like it?

[D.FYLAKTOS]

15 hours ago, Thefeliciahacker said:

Why dont you like it?

 

Every time i want to oil the mechanism or clean the throttle body or clean the MAP i had to remove it (3 screws).

The plastic absorbs heat from the engine and preserve it, it's not metal plus without it the area above the manifold could be more ''free'' for air circulation.

 

I wish i could make the same.

 

[Thefeliciahacker]

5 hours ago, D.FYLAKTOS said:

Every time i want to oil the mechanism or clean the throttle body or clean the MAP i had to remove it (3 screws).

That every time is every 5000kms sooo once a year you undo 3 bolts who cares

 

5 hours ago, D.FYLAKTOS said:

The plastic absorbs heat from the engine and preserve it

plastic does not absorb heat nor preserves it, it has way higher heat capacity and way lower thermal conductivity 

So aluminum is 1000 times more thermally conductive

and plastic has a higher heat capacity which means you need more energy to heat it up per same unit weight, in fact approx 2 times as much!

 

[D.FYLAKTOS]

17 minutes ago, Thefeliciahacker said:

plastic does not absorb heat nor preserves it, it has way higher heat capacity and way lower thermal conductivity 

 

I meant comparing to a chrome tube that some air intake systems use.

Supposed that reflects the heat and gets cooler sooner.