> > Don't know the size. When measured the bore diameter is 1&3/8
> >
> > It's a 1988 MINI Mayfair, RHD, 998CC.
> > Has a plastic air filter assembly.
>
> It should be an HS4 unless a previous owner has changed it (unlikely).
> Thanks,
>
> It is an HS4!!! Hasn't been changed since the car hasn't been modified at
> all. It's just as it came out of the plant. No rust!!! Everything working
> fine. Need to fit a new filter to pass the Ontario emission test. It's
> running rich at idle.
Thanks for reminding me - I must get the paper air filter off my Mini out
the washing machine :)
Yeah, it's tight of me, but I'm working to MOT on a budget here!
> Thanks to Drew from the previous post, will fit a needle that will run
> leaner for the test.
If you fit a K&N, you'll be wanting a richer needle, not leaner. To get the
car through the emissions test, try winding the nut on the jet up a little -
Not too much, or you'll run way too lean, get a misfire, and that will shoot
the HC level up massively. Don't know if that's on the Canadian test, but I
imagine it is.
IMO K&N filters on Minis are shiny noisy and not very useful unless they're
the replacement element types, as the carb sits right over the exhaust and
will simply pull hot air into the engine if there's no cold air ducting
added. The replacement element types that go inside the standard air box are
pretty good though, although then you've got the restriction of the air box
to sort out.
If you're after simply getting the car working, and aren't aiming for power,
get another paper element, or bang yours through a 60 wash in the machine
(if married, don't let the wife catch you!). Once it's all road legal, start
looking at stage one kits if you want more power.
All IMO, as no doubt there's plenty of people who'd disagree with every word
I've just said! :)