Garyd
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| posted on 1/3/10 at 06:18 PM |
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Air filters.....Are they needed
Hi All
I was wondering if you really need air filters as due to lack of space I run sock filters on my bike carbs and have read many bad reports about them.
so do I really need them I know they stop things getting in the engine but as my carbs don't protrude outside the bonnet is this a concern.
Will it make the car run lean? or affect the running in any other way.
A lot of question I know but hopefully someone can offer some advice.
Gary
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tigerzetec
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| posted on 1/3/10 at 06:22 PM |
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I know some people don't bother, but i wouldn't want to risk sucking in grit & dust from the roads. Especially in the summer when its
dry. I currently use socks, but thats because i cant fit a sausage type due to space.
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whitestu
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| posted on 1/3/10 at 06:22 PM |
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Not an option unless you want to trash your engine fairly quickly.
Stu
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will121
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| posted on 1/3/10 at 06:23 PM |
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expect it will run lean, but more so increase engine wear, if you look at the amount of grit build up in a filter and imagine it all going through the
engine/bore damage and also blocking carb air jets etc
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mookaloid
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| posted on 1/3/10 at 06:28 PM |
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Why not try it? we would all love to know the true answer to this question 
"That thing you're thinking - it wont be that."
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Bluemoon
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| posted on 1/3/10 at 06:29 PM |
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I think you should fit one.. Unless you only going to do a few hundred miles.. About to fit one to mine (keep putting it off, at least it's a
free CVH engine, I don't want a bonnet filter hole...).
Dan
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britishtrident
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| posted on 1/3/10 at 06:30 PM |
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Really not a good idea to run without air filters.
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zilspeed
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| posted on 1/3/10 at 06:39 PM |
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I know at least one person who left the carbs on his single seater open.
Hot sticky tyres led to stones being chucked up, one of which made its way into a carb.
Bye bye engine.....
Air filters would have sorted that quite easily
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vyperstrype
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| posted on 1/3/10 at 06:47 PM |
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Air Filter
Hi Gary, I wouldn't worry too much about Air Filters. I've been running mine on bike carbs for about three years and haven't had a
minutes bother with the carbs. I give the carbs a good clean every now and again with carb cleaner. I have a fine stainless steel gauze on the side of
the bonnet to stop anything of any size that could cause damage to the engine. DON'T use aluminium as a gauze as it reacts and breaks down with
the petrol vapours above the carbs. I hope this puts your mind at rest. Eric. 
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Daddylonglegs
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| posted on 1/3/10 at 07:10 PM |
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You'll be running lean therefore hot, and also as said be dragging alsorts of kak into the engine 
Not a good idea
It looks like the Midget is winning at the moment......
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Garyd
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| posted on 1/3/10 at 07:25 PM |
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Thanks all for your quick replies I guess the best bet is to give them a good clean and leave as is. To be honest I didn't give a thought about
dust entering the carbs. Better to be safe than sorry.
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boggle
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| posted on 1/3/10 at 07:34 PM |
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think of it like this...
would you want to breath heavily in a dusty room????
just because you are a character, doesnt mean you have character....
for all your bespoke parts, ali welding, waterjet, laser, folding, turning, milling, composite work, spraying, anodising and cad drawing....
u2u me for details
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britishtrident
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| posted on 1/3/10 at 07:36 PM |
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Not dust entering the carbs dust entering the cylinders apart from being an instant rebore kit it also gets into the oil.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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scootz
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| posted on 1/3/10 at 07:39 PM |
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As above... it's one thing stripping and cleaning a set of carbs - another thing doing an engine re-build!
It's Evolution Baby!
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dhutch
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| posted on 1/3/10 at 08:36 PM |
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I didnt spend £70 on a itg megaflow for fun. I woudnt run without one.
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perksy
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| posted on 1/3/10 at 08:57 PM |
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Personally Wouldn't Ever run without one
Why Risk it 
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Garyd
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| posted on 1/3/10 at 10:22 PM |
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definate for the air filters to stay now,
Thanks all.
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hillbillyracer
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| posted on 1/3/10 at 10:56 PM |
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Some interesting info on the links in this thread on the PPC forum:
http://www.ppc-mag.co.uk/forum/viewtopic.php?f=3&t=7430
The general opinion seems to be that a decent sized paper filter will flow well enough & give the best protection, the likes of K&N flow
better but the paper ones are much much better at filtering.
Of course finding room for one under the bonnet of a seven may be abit more difficult than the average saloon!
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boggle
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| posted on 1/3/10 at 11:14 PM |
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a good air box will also stop heat soak....
just because you are a character, doesnt mean you have character....
for all your bespoke parts, ali welding, waterjet, laser, folding, turning, milling, composite work, spraying, anodising and cad drawing....
u2u me for details
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iank
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| posted on 1/3/10 at 11:18 PM |
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quote:
Originally posted by hillbillyracer
Some interesting info on the links in this thread on the PPC forum:
http://www.ppc-mag.co.uk/forum/viewtopic.php?f=3&t=7430
The general opinion seems to be that a decent sized paper filter will flow well enough & give the best protection, the likes of K&N flow
better but the paper ones are much much better at filtering.
Of course finding room for one under the bonnet of a seven may be abit more difficult than the average saloon!
Anyone who thinks a paper filter is better at filtering than a K&N might want to look at what the Dakar rally cars use
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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hillbillyracer
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| posted on 1/3/10 at 11:33 PM |
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quote:
Originally posted by iank
quote:
Originally posted by hillbillyracer
Some interesting info on the links in this thread on the PPC forum:
http://www.ppc-mag.co.uk/forum/viewtopic.php?f=3&t=7430
The general opinion seems to be that a decent sized paper filter will flow well enough & give the best protection, the likes of K&N flow
better but the paper ones are much much better at filtering.
Of course finding room for one under the bonnet of a seven may be abit more difficult than the average saloon!
Anyone who thinks a paper filter is better at filtering than a K&N might want to look at what the Dakar rally cars use
A K&N would be excellent for use in sand, but we're in britain on the road, who's going to do the Dakar in a seven?
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bassett
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| posted on 2/3/10 at 02:04 PM |
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I was under the impression that the paper OE style filters are denser and made for engine longevity with the performance increase on foam/cotton gauze
style filters being they have more open weave to allow greater flow and are oiled to catch/hold on to grit but are less effective.
My MNR Blog Updated Jan 2010 - Track Day Prep Begins!
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iank
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| posted on 2/3/10 at 02:39 PM |
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My point is they cope with dust clouds (not just big grains of sand) that would kill an engine in <1km if they didn't protect effectively.
Their down side IMO is they need more regular maintenance (cleaning and oiling) and cost a lot more than paper filters.
Both good reasons for OEM manufacturers to use paper filters.
Note I'm talking about K&N style gauze filters, I have my doubts about the filtering of a lot of the foam style ones, though they certainly
flow well.
I think the PPC article has some validity in that an OEM filter is spec'ed oversize to allow for any clogging over the 20k service intervals we
see these days, so when new will flow enough for a few stages of tuning (but you'd be best replacing more frequently if you do). But for a 7
there really isn't the kind of room you'd need for a big panel filter box so you'll be going aftermarket anyway.
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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