Intake

[Zahid]

Hey,

I have a Mk1 2.0, with a cone air filter.On the throttle, where the intake pipe attaches is a butterfly valve sorta thing.

I am in the process of fitting a proper cold air induction system direct to the intake, should I remove this valve?Also, I have read here that the best is not to change the original airbox.????

And im decating the car today....what recomandations?

 

[Lagerlout]

You can remove the accoustic valve. It's predominantly to reduce induction noise.

The standard airbox is not the best thing available as some may have you believe, but a free flowing panel filter is a good compromise in terms of cost.

 

[Neil G]

Stick with the OE airbox and a decent panel filter.

I am led to believe a lot of these claims about cone filters/IKs being superior is just marketing BS.

I fitted a K&N to my old 19 16v and it really killed off the torque (not that it had much in the first place anyway!)

 

[Zahid]

Thanks.

my airbox is cylindrical....I dont think there is a panel filter for it.I have modified a cone to fit in the box, but a full induction will look cooler.

One more q,

2 weeks ago my car wouldnt start, happened a few times, lights were coming on but the engine wouldnt turn.It woul jump start tho. I had the battery changed, and that solved the problem, but on my way back to the ofice now, I stopped and swiched the engine off, was back within 2 minutes, and it did it again, didnt want to start, I did a push start and drove off, when I stopped now, everything was fine and she started on the turn....what could be wrong?

 

[theduck]

you can get cylindrical filters from all major filter manufacuturers

 

[Zahid]

in sunny ole SA that , its not that easy ....Ive called around, no luck.

 

[Dan@SJM]

2 weeks ago my car wouldnt start, happened a few times, lights were coming on but the engine wouldnt turn.It woul jump start tho. I had the battery changed, and that solved the problem, but on my way back to the ofice now, I stopped and swiched the engine off, was back within 2 minutes, and it did it again, didnt want to start, I did a push start and drove off, when I stopped now, everything was fine and she started on the turn....what could be wrong?

Does the starter have the heatshield on it? if not this is the problem.

 

[Zahid]

Will have to check....

 

[Neil G]

I have had a closer look at this valve and there is a vacumn pipe going to the inlet from this valve.

I assume the valve must use pressure in the inlet to open/close it at different engine speeds?

The airbox has two inlets so maybe it closes one off at higher engine speeds so it uses just the one from the front which is close to the headlamp?

 

[Zahid]

So will still be safe to remove the valve?those inlet pipes on the airbox that run to the headlights, i doubt it gets much intake, I was thinking that mabe I need get a better systym in place.

 

[Neil G]

I was taliking about the vacumn pipe that goes to the inlet manifold.....I think if your going to remove the valve it'll be a good idea to plug this up.

 

[theduck]

get someone to ship a cylindrical filter to sa for you?

 

[Zahid]

At What Cost?

 

[GordonD]

Neil G

I'd suggest its more likely that it closes that intake pipe off at low revs. Only opening both of them at higher revs when the engine needs lots of air and you don't mind the extra noise of a more direct intake. Doing that That would keep air speeds high in the intake pipe that's open at low speeds, which would boost torque because you wouldn't be getting flow reversals. That matches what I've heard in other postings, that that valve somehow boost torque below 4500 rpm, and removing it or locking it open loses you some low range torque. The engineers that design cars aren't stupid. If you're going to connect a cold air or ram-air intake connect it to the intake that's got the valve on it.

 

[Neil G]

Thanks for the explanation Gordon.....I had a look at the valve last night and traced the vacumn pipe back to the inlet so gathered it must have something to do with opening/closing at different engine speeds.

I have decided to leave it in-situ now for the reasons you state....it's obviouisly designed to improve drivability which I'm okay with even if I'mloosing outright power