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General Category >> Rubber Side Down! >> Missing Air Filter, what kind of symptoms
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Message started by Mattdw on 08/24/08 at 19:50:44

Title: Missing Air Filter, what kind of symptoms
Post by Mattdw on 08/24/08 at 19:50:44

Hi all,

I bought Lancer's jet kit and was going to do a full overhaul on a '96 Savage that wasn't really performing consistently the way I like. I made adjustments to the air bleed to no avail.

I decided I would check all the usual suspects, spark plug, air filter. Opened the air box to discover, guess what, NO air filter.

What kind of performance problems would I have experienced without it?

I'm going to get a new one tomorrow but I just wanted to know if any of you had any insight as to what I would have seen?

Title: Re: Missing Air Filter, what kind of symptoms
Post by 1st2know on 08/24/08 at 20:04:33

Hehe - a hiigh flow air filter, like the one you describe, would make it run lean :-)

I doubt if there would be immediate symptoms of running without a filter, you might expect pitted cylinder walls, pitted valve seats, depending on how long this machine ran with no air filter. A few miles may be ok, but if was like that for a running season or two, you may have valve job and cylinder honing in your future. The purpose of the filter is to keep dust, insects and small mammals out of the combustion chamber.

When I was a teen - we would run cars and bikes without filters on race nights. We figured we were going to destroy the machine anyway, so why bother with engine/wild life protection :-)

Title: Re: Missing Air Filter, what kind of symptoms
Post by Mattdw on 08/24/08 at 20:19:42

Would it have also caused adjustments to the pilot screw to be somewhat 'ignored' and horrible backfires ?

Title: Re: Missing Air Filter, what kind of symptoms
Post by verslagen1 on 08/24/08 at 23:38:51

71786B74797D6873721C0 wrote:

Would it have also caused adjustments to the pilot screw to be somewhat 'ignored' and horrible backfires ?

yes and yes, great big kerpows rivaled only by large bore Howitzers.

Title: Re: Missing Air Filter, what kind of symptoms
Post by skrapiron on 08/25/08 at 05:40:39

Not to mention whole bugs being sucked into the carb and gumming up the works!

No air filter is going to run wicked lean. I mean wicked lean. Not a good idea, at all!

Title: Re: Missing Air Filter, what kind of symptoms
Post by Rock_Steady on 08/25/08 at 08:51:40

So here's a question, not to hijack the thread, but....

I'm looking at doing the oldfeller mod to the air filter. I currently have a machine that is probably running a bit lean, I have the occaisional backfire when decellerating, esp. on a downhill. Can I expect these to get lots worse? Should I not think about modding the air filter unless I also do some carb and exhaust changes?

Title: Re: Missing Air Filter, what kind of symptoms
Post by serowbot on 08/25/08 at 10:19:56

1B2520204C0 wrote:

Yup!...

Title: Re: Missing Air Filter, what kind of symptoms
Post by skrapiron on 08/25/08 at 11:09:45

Is the Pope Catholic?

Any time you add air, your a/f mix is going to lean out even more. You will have to rejet to compensate.