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Old 5 Days Ago   #46
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Re: Going from a 100HP to a Twin Air (or 1.2) - have you?

Ahh, thanks for that - will check it out.

I know there is always a lot of debate about different filters. I prefer to stick with an easily changed and cheap genuine panel item - the beauty of the Cooper mod was it just replaced the restrictive (noise killing) baffle in the air intake, filter was unchanged.
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Old 4 Days Ago   #47
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Re: Going from a 100HP to a Twin Air (or 1.2) - have you?

Quote Originally Posted by Goudrons View Post
I thought it might be better to bin the standard filter out of the airbox for a replacement BMC panel filter, then remove the intake ends trumpet and replace that with a straight pipe rather than the trumpet bell style pipe.
I guess you could also run right through the empty air box with a cone filter on the end of the intake pipe (that you fit instead of the restrictive trumpet).

I reckon that would give a similar sort of airbox howl as you get from big sports bikes.

It seems a shame to dump the engine cover altogether, the early ones with the the red and white "Fiat Twinair Turbo" on them look a lot smarter than a bare engine.
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Old 4 Days Ago   #48
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Re: Going from a 100HP to a Twin Air (or 1.2) - have you?

I've not seen one in detail of course but is there not just a restriction or baffle or angle of some sort within the air box that could be removed to allow a more direct flow?
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Old 4 Days Ago   #49
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Re: Going from a 100HP to a Twin Air (or 1.2) - have you?

Quote Originally Posted by Goudrons View Post
I guess you could also run right through the empty air box with a cone filter on the end of the intake pipe (that you fit instead of the restrictive trumpet).

I reckon that would give a similar sort of airbox howl as you get from big sports bikes.

It seems a shame to dump the engine cover altogether, the early ones with the the red and white "Fiat Twinair Turbo" on them look a lot smarter than a bare engine.
.... and also maintain the benefits of the well designed airbox too. Good idea !
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Old 4 Days Ago   #50
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Re: Going from a 100HP to a Twin Air (or 1.2) - have you?

Quote Originally Posted by Dervdrain View Post
I've not seen one in detail of course but is there not just a restriction or baffle or angle of some sort within the air box that could be removed to allow a more direct flow?
I'm not qualified to comment on what you might do with them, but here are a few pictures of the cover, air box and filter:

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(Ignore the photo of the oil filter - I inserted this by mistake and it hasn't deleted !)
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Last edited by chr1s; 4 Days Ago at 19:19. Reason: explaining extra un-related photo
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Old 4 Days Ago   #51
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Re: Going from a 100HP to a Twin Air (or 1.2) - have you?

The air filter is on the underside of the engine cover.
It comes through the intake trumpet, up through the filter.

Through the gap above the filter then out the other end to the turbo pipe.

As the cover is so flat, the gap under the filter in the filter housing (dirty air side) is very tight, so most of the space is actually taken up be the filter.
(poor pics, sorry)



There is only really that small corner of the filter to the left that's not up tight against the bottom of the housing and that's just inside the joint with the intake trumpet.

(useless pic that's upside down! but this is the view through port with the trumpet removed)



Above the filter housing, out toward the turbo pipe is also quite narrow, perhaps a fingers width then is opens out where the turbo pipe fit's.

(opens up where you can see the lagging)

Seems to me the underside of the filter housing on the dirty side is very limited, most of it is blocked by the actual housing.
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Old 4 Days Ago   #52
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Re: Going from a 100HP to a Twin Air (or 1.2) - have you?

Wow. Super helpful guys, many thanks. I just need to find one to buy!

I bet there's a restriction or baffle/elbow in that plastic trumpet or pipe work though just like on the 100 HP to cut down noise. Just need to look inside or replace just the trumpet with a clean pipe??
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Last edited by Dervdrain; 4 Days Ago at 01:13.
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Old 1 Day Ago   #53
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Re: Going from a 100HP to a Twin Air (or 1.2) - have you?

Quote Originally Posted by Dervdrain View Post
Wow. Super helpful guys, many thanks. I just need to find one to buy!

I bet there's a restriction or baffle/elbow in that plastic trumpet or pipe work though just like on the 100 HP to cut down noise. Just need to look inside or replace just the trumpet with a clean pipe??
Good work too Dervdrain - just the sort of investigation we need! Like all these things, it's a matter of finding the one or two most obvious 'restrictions' in an engine setup and seeing how far along the good-power/quiet-noise compromise journey you feel you're willing to travel.

Some cars are quite heavily restricted on inlet flow in order to keep noise down, as well as maintain 'space' above the model for an RS or similar. My old supercharged Audi S4 was a point in question - that was a 450-480bhp engine with just an induction change and remap (333bhp as stock), which would have taken it waay above the RS4 at the time (or even now, still in fact). Time will tell if there's much to be had from induction changes on our TA's, but the 105bhp engine found that extra 20bhp pretty easily by the looks of things, so I look forward to hearing about your investigations Dervdrain
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