Sports Air filter do they work?

[miguel]

re- modulators response.
matching the the manifolds to the ports of the cylinder head isn't really "porting" and polishing doesn't really do anything to increase the air flow through the head. "porting" in the simplest form, involves getting an air powered die cutter runnig at about 20,000 rpm and carving as much possible as humanly possible out of your ports before you go through into the water jacket. you'll need to carve out as wide and deep as you can around the back of the valve guides. use a multi angled valve seat cutter to ensure the valve sits on the edge of its seat. If your not sure what your doing, spend about ten grand on a flow bench and try out different porting techniques on a pile of old heads and you'll find it comes back to the same thing, get in there and cut as much as you can but leave a smooth, profiled transition from valve seat to manifold.

[modulater]

re- modulators response.
matching the the manifolds to the ports of the cylinder head isn't really "porting" and polishing doesn't really do anything to increase the air flow through the head. "porting" in the simplest form, involves getting an air powered die cutter runnig at about 20,000 rpm and carving as much possible as humanly possible out of your ports before you go through into the water jacket. you'll need to carve out as wide and deep as you can around the back of the valve guides. use a multi angled valve seat cutter to ensure the valve sits on the edge of its seat. If your not sure what your doing, spend about ten grand on a flow bench and try out different porting techniques on a pile of old heads and you'll find it comes back to the same thing, get in there and cut as much as you can but leave a smooth, profiled transition from valve seat to manifold.

I know exactly what porting is miguel.

Porting is removing un needed metal from inside the head ports so that you have an unhindered flow into the cylinder.
A head is a mass produced item and is by its very nature rough in the way it is cast and also is open for improvement.

As indeed you said you use a die grinder and I myself are currently messing around on an old head from a GT scirocco to see and experiment with what I find. I am also looking out on ebay for old 16V heads just to mess around on.

I just wanted to point out that the actual matching of inlet manifold to cylinder head isnt actually that hard and you would pay some tuners ?80 for what is a basic task if you have the right tools.

[miguel]

yep!

[mk1GLF]

all these filter things, im back to old skool mk1 k-jet, someone said to get an induction kit, only pipercross manufacture them, but how with air/fuel braided hoses running from top of box across to block? if anyone knows be interested to know.
had an itg cone on a mk2 digifant, did have a bit more but only when cooler, when it was a hot day or engine got nice and warm, there was less performance.

driven plenty of vr6's couple with induction kits, sounded good but seemed les responsive until about 3-3500 revs. supercharged with a better full exhaust system gives much better results in sound and power.

also on that vr6 page posted about the cam-shafts, whats that about higher mileage "you might need to have new tappets too??!" new bottom end could be needed if it goes bang. been warned off cams in high mileage cars unless everything is done.

[golfvr6]

The pipercross induction kit is like a cage with the top of the air box still on it. Vr6 will obviously be better with a supercharger on it, but it will cost over 2k. I've never found induction kits/filters to work badly when its hot. The power spread on my vr6 was all at the top until i put my k+n on it. I think its a case of, filters are worth doing cos its under 100 quid.  As for high mileage engines, its not recommended to mod them too much without a decent rebuild.

[E1v15]

performance filters do work but work best when they have decent cold air feeds or are sealed away from the engine bay where the hot air is (the best option). A modern engine shouldn't run lean as they use ego/uego sensors measuring the exhaust gases and they have air flow meters/sensors measuring the flow and sometimes temp of intake air !

If a filter is fitted to a car the ecu will account for the changes in air flow and exhaust gases. performance filters flow more air which is good but don't actually filter as well. the whole thing is get a bigger filter it has less restriction but have decent cold air feed to it or seal/insulate it from the engine bay !

this is my opinion and not everyone may agree but hey life would be boring if everyone agreed !

[modulater]

I'll agree with that.

[golfvr6]

Yep

[fingermouse1911]

wanna talk to me bout physics? go ahead - i've done a degree in physics. You lot are an advertisers dream - beleive all the hype!

The reason it adds to your insurance is coz the type of peeps to add it to their car are the kind who drive  faster (boy racers). This isn't my opinion its wat the insurance companies go by.

Gotta agree with you there Golfgal.  In Mr VR6's defense induction kits DO add BHP, one for increased airflow at high revs, 2, Colder air if u add the pipe that sucks air from out of the engine bay.  3, slightly increased fuel as a result of slicker airflow.  I see it as attention to detail.  If you take care of the smaller aspects of tuning, Induction, Exhaust, ECU Remap... then moving onto Cams, Ports you can see significant gains.

I want an induction kit for my V6 4motion but it's purely for the nice sound it will make :-D

[AudiA8Quattro]

The best filter to use in my experience is the k&n panel filter with a the air ducts removed, and/or drilling.
I experimented with the vr6 for a while, paper filter with standard box, induction kit, k&n panel with drilled box.
The best results for me was the k&n panel with a drilled box. The standard box with paper filter, made the engine feel very flat until over 4000rpm, with the k&n panel and drilled box, the power band felt like it started at 2500rpm instead.
I think people completely miss the point about performance filters.
You won't get many more bhp/torque overall, what you get is a pretty decent increase in bhp/torque between 2000-4000rpm, a very noticeable difference. This makes the car feel much more driveable, and will improve engine response and acceleration a bit.
Its not just about noise.