Austin Metro Air Filter Box Compatibility
Posted 10 August 2018 - 09:34 PM
One of these:
Posted 11 August 2018 - 08:54 AM
That is the same air filter box that is fitted to my 94 Mini with HIF38 carburettor so I would say it should fit.
How it would compare with other boxes I couldn't say.
Posted 11 August 2018 - 10:26 AM
As for air flow, I can’t really see that you’d notice any discernible difference between any of the housings, on a road car setup. If you’re worried about air flow though, then drilling a series of 1/2” holes in the front wall of the housing is supposed to maximise air flow when using a high flow filter inside the box. I tried this on an old housing I picked up at an auto jumble stand once & it seemed to maximise noise, but not a lot else though!!
Posted 11 August 2018 - 11:28 AM
I went from a K&N cone to a drilled airbox with a K&N element then back to the original one with the K&N. The only real differecce I found was the big reduction of noise.
Posted 11 August 2018 - 02:41 PM
Thanks all, I have two spare and wondered if I should keep one if I fit a spare HIF38 to my Mini after fitting a stage 1 kit.
I'll put one up for sale.
Ref drilling holes - In a reply to a thread I started recently ref Engine Upgrades, that rather than going for a Cone or Pankake filter, on my SU HS4 carb that I should stick with the standard housing and drill holes (on the underside of the intake hose?
Posted 11 August 2018 - 06:10 PM
There might be some gain if you thrash it but the standard air box, with a K&N element I found is fine.
I think it was Keith Calver who did an experiment with an 850 on a dyno comparing the K&N cone, a standard air box and a drilled one. The K&N came off worse then the standard box with the drilled one just ahead so it does work, I just preferred the reduction in noise to the extra couple of BHP.
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