Ideas For Fitting An Air Filter

[Jonmurgie 2]

Having gone down the route of using an airbox with the Jenvey Throttle Bodies on my Mi16 I think I should probably run with an airfilter of some kind... this is the setup as it stands today:

 

 

 

 

I should point out right now that this is clearly a TRACK ONLY setup, as I can't run about without a headlight on the road (or can I.... )

 

The choices I see are as follows:

 

1. Leave it as is for track use, no filter

2. Fit a panel filter actually IN the headlight before the ducting

3. Fit an inline filter in the ducting

4. Stretch some thin material (tights?) over the headlight front

 

Um, that's all I can think of for now... but was wondering if anyone else had any suggestions or had seen anything similar and how they filtered the air

 

Cheers

Jon

[DrSeuss 0]

You can get those filters surrounded by a carbon can that would work. Sealed so you could run the ducting to them. You can also get a daylight mot which doesn't require headlights. Not running a filter is a good way to destroy your very expensive engine if you happen to do something like suck in flies or a stone.

[Jonmurgie 2]

Yeah, I know the ones you mean though I have no idea they do those in 100mm in and out as it's pretty big! Am just looking around the net now...

[tom_m 0]

jon you can get filters designed to be internal to airboxs like this:

 

 

or this:

 

*Cliccy piccy for link to Reverie

 

ReVerie use them in there airboxes

Edited January 19, 2006 by tom_m

[Jonmurgie 2]

Cheers top... ReVerie are £££ mind!

 

Those bottom filters look ideal, will look into those

[Dom9 2]

They look a bit small to me... But they are probably fine if Reverie are using them on high spec, 200bhp+ K series engines...

 

One of those would definitely be the easiest solution and probably the 'cleanest' and I doubt they are more expensive than those inline carbon can things... But you look to have plenty of options!

 

Looking forward to seeing what numbers thsi engine puts out!

[Garry 1]

You could also go down with the ducting, so that a cone filter would sit near the front wheel and gearbox. Thats what I have on my GTI6 lump. You will get plently of cold air all around the cone, there is also a fair bit of room. Although saying that the radiator may raise the temperature a bit............

Just watch out for deep puddles though!

[Dream Weaver 2]

Dont run without a filter, that would be the worst option and can in some cases lose you some power.

 

Will a simple cone filter not fit on the end inside the headlight casing?

[Jonmurgie 2]

Have contacted K&N and ReVeire and both got back to me within 10 minutes (great customer services!!)... K&N said they are made exclusively for ReVeire and ReVeire said they only do them in 150mm... doh!!

 

Will a simple cone filter not fit on the end inside the headlight casing?

 

That's what I'm thinking as well now... though it would look a bit s*ite! Those K&N things would have been perfect, I'd have used a ReVeire airbox if they weren't over £300!!

[Sam 4]

Cone filter, or perhaps cut a panel filter to fit somehow. Panels are cheap too.

 

If its track only I wouldn't worry so much.

[tom_m 0]

Have contacted K&N and ReVeire and both got back to me within 10 minutes (great customer services!!)... K&N said they are made exclusively for ReVeire and ReVeire said they only do them in 150mm... doh!!

That's what I'm thinking as well now... though it would look a bit s*ite! Those K&N things would have been perfect, I'd have used a ReVeire airbox if they weren't over £300!!

 

blimey guv'nor, you must know a magic word or something! bugger about them being custom jobs though!

 

sounds like an inline pipercross viper is the answer maybe? are you just gonna be running a 100mm cone on the air box when not on track?

[Rippthrough 98]

You'd lose most of the ram air effect with a cone on the end of the pipe, somewhere directly before entering the airbox would be your best bet there.

Tight's would probably not be a good idea because they are low mass and tend to resonate, unless you can pull them really damned tight (no pun intended)they will probably lose you power.

Edited January 19, 2006 by Rippthrough

[Jonmurgie 2]

There may still be a little ray of hope from K&N as they asked me which part needs to be 100mm when I asked if they could make one... we shall see!

 

Failing that, I think I'll just put some mesh over the front or back of the headlight... just to stop large particles getting in!

 

Yeah, on the road I'll just stick a 100mm cone filter on the end of the box... question is what's gonna be the best:

 

Ramair

ITG

K&N

Pipercross

 

??

[cybernck 402 1 Cars]

my question is, what sort of setup are you going to run on the road?

 

just a cone on the airbox?

[Jonmurgie 2]

Yeah, on the road I'll just stick a 100mm cone filter on the end of the box...

 

[cybernck 402 1 Cars]

DOH!

 

note to self: must sleep during nights, not browse forums!

[James_R 3]

Could you not just get pipercross or who ever to make a panel to your sizes? to bolt on to the front of the headlamp? no good in rain, bu ton a dry day would be ok

 

Or can yo fit a sausage filter inside the airbox?? maybe one moutned right on the tip of the trumpets?

 

[DrSeuss 0]

having a panel filter the size of the headlight would have very little surface area. Thus it would provide a restriction to flow. Which is BAD. Think about a cone filter laid out flat and its area would be quite sizeable in comparison.

[Rippthrough 98]

Or can yo fit a sausage filter inside the airbox?? maybe one moutned right on the tip of the trumpets?

 

 

That kind of negates the point of an airbox

 

Cone on the end of the air box and see if your ducting will fit over it?

[tom_m 0]

There may still be a little ray of hope from K&N as they asked me which part needs to be 100mm when I asked if they could make one... we shall see!

 

Failing that, I think I'll just put some mesh over the front or back of the headlight... just to stop large particles getting in!

 

Yeah, on the road I'll just stick a 100mm cone filter on the end of the box... question is what's gonna be the best:

 

Ramair

ITG

K&N

Pipercross

 

??

 

OMG! now I know you know a magic word!

 

K&N every time!

[Rippthrough 98]

OMG! now I know you know a magic word!

 

K&N every time!

 

Green cotton.

By most accounts they filter a lot better for a slight loss in airflow. Which doesn't matter provided the filter is large enough.

[markrnorton 0]

having a panel filter the size of the headlight would have very little surface area. Thus it would provide a restriction to flow. Which is BAD. Think about a cone filter laid out flat and its area would be quite sizeable in comparison.

 

 

sorry dr, but that's a duff statement.

 

surface area has nothing to do with flow rate or filtering properties. a cone filter may have a larger surface area, true, but what size cone are you talking about ??. if the cone was large enough yes, but you dont know what size will fit. cone filters fitted in the wrong place also create other flow characteric problems

 

panel filter over the headlight would be jons best bet, you will negate some airflow into the box, but you will still have a high pressure zone in front of it to force air through.

 

best solution all round is to fit a panel filter at the join of the air box and flexible ducting. and a stone guard over the headlight

 

ram air effect to the engine will only be marginal anyhow, the car wont go fast enough for a true full effect, and then you have to calibrate you injection system to cope with the additional air flow at speed which is virtually impossible on a rolling road. airbox system with that air pickup will be far better at picking up cooler air, this will have a greater effect of performance over any 'ramair' effect.

 

 

oh and K&N is the only choice. the best.

 

Jon

 

you must run with a filter, engines last 10 seconds without filtering, you're break/wear out your investment fast.

plus you only need the tiniest of gravel or kak off a track to go down your ducting/air plenum and down a bore and score it, or shag a valve from closing.

 

 

ps. I have dealt with fluid flow, thermodynamics and such like for over 20 years. i can go into filtering properties, flow charts, free area flow, pressure drops etc if you like. but it's pointless , cause most people on here do there own thing anyhow.

i do, its a forum.!!!!!

[DrSeuss 0]

sorry dr, but that's a duff statement.

 

surface area has nothing to do with flow rate or filtering properties. a cone filter may have a larger surface area, true, but what size cone are you talking about ??. if the cone was large enough yes, but you dont know what size will fit. cone filters fitted in the wrong place also create other flow characteric problems

 

panel filter over the headlight would be jons best bet, you will negate some airflow into the box, but you will still have a high pressure zone in front of it to force air through.

 

best solution all round is to fit a panel filter at the join of the air box and flexible ducting. and a stone guard over the headlight

 

I'm slightly confused as to how you can say surface area hasn't much to do with flow rates. Try sucking through a straw, now try sucking through a mouthful of 20 straws. You will notice the difference!

 

This is very basic fluid mechanics? Not 20 years worth.

[Jonmurgie 2]

Cheers for the info guys... I'm still in talks with K&N on fiding a suitable solution I shalln't run it with NO air filter as the risks are too high!

[Sam 4]

Perhaps a cone behind the headlight and something like this?

 

Big Picture!!