K&N 57i?

if you are lucky, someone is possibly giving them away the new new new designed version, like 3 days old designed version, has been fitted to crusty's car come to ford fair and see what all the fuss is about BEFORE you go and shell out loads of cash on filter the old ones are now obsolete

They look nice in the engine bay. They're fit-and-forget, so you don't need a new filter every service. They make your engine sound "nice". Don't expect much power gain, if any.

I had one on my previous car, and I liked it.

the K&N panel filters can play havic with MAF sensors though!!

the oil on the filter ends up on the MAF sensor, causing numerous running problems.

Chad

Could this be what screwed the MAF in my astra? It wasn't a K&N, but a foam element from Courtenay. I did only spray the oil on the "dirty side", as instructed. When the MAF sensor was removed, it was covered in a very thin film of dirty oil. The vauxhall bloke reckoned it was blow back from the crankcase breather, but was it?

I replaced it with the paper filter before I took it to the vauxhall dealer for new one though. Should I stay with paper now?

-- The Dervboy

Reply-to address is valid as required by my news server, but is a spam box and is never read. My real e-mail address is thedervboy{at}btopenglobe{dot}com (substituting "globe" with "world").

But these give very poor filtration - avoid.

So do you reckon it'll be safe to put my foam filter back in now? I do miss the extra puff it gave at higher revs. It gets lethargic towards 4000rpm now, even with a brand new paper filter.

The Dervboy.

Yup, try it and see. The worst thing that can happen, is you having to spend 5 minutes cleaning the sensor with some WD40 !

As t'others have said, make more noise than anything, and can let in lots of hot air, too - depending on the design of the engine bay. As I recall from poking about Sierras over the weekend, as you stand at the car's nose facing the donk, the air filter(s) go to the very front right of the engine bay.

Trouble with these filter kits is that they're only as good as the air intake . . . if you get hot air into your engine, it'll negate any airflow benefits - engines don't like hot air, it's less dense than cool air and therefore carries less oxygen (as a starter for ten). Some of the kits give you a weany little "fresh air tube" like it's supposed to be of benefit - bwahahahahha! - do do consider this. Air's lazy, it'll take the short cut, so in the city, there are a lot of moddeds Kas sucking in hot air from the engine bay . . .

ask jim to send you a pic of his engine bay :) secretary has an all singing all dancing NEW revised sierra 57i kit on his sierra which is a lot better than the older version if the op joins the club he might even win one for his car :)