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Old 07-05-2005, 04:36 AM   #1
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Default AIR BOX filters? advantages and disadvantages?

What are the advantages and disadvantages over the comon air filters, mainly used on 1/8th onroad EFRA.


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Old 07-05-2005, 05:49 AM   #2
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I think you may be refering to the "Silenced" box filter. Or INS (Induction Noise Silencer) box.

http://www.mytsn.com/products/image.aspi?prid=677

No advantages to speak of performance wise. They restrict the airflow to the filter marginaly. Not a huge drop in performance, 99% of us wouldnt notice it.

However, they do greatly reduce induction noise, which is a large part of the noise level produced by our little cars. I think its mandatory to run these on some scales under EFRA rules, and some other tracks with noise restrictions require their use.

They are basically just a housing over the top of a regular foam filter.
http://www.mytsn.com/publ/psimage.aspi?pid=4734&psid=1
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Old 07-05-2005, 06:12 AM   #3
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One of the main advantages is, it keeps your foam filter very clean......
No need to wash and re-oil it, just use it for a year, and buy a new foam filter......
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Old 07-05-2005, 07:31 AM   #4
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But it have some dsadvantage on the airflow side ? ... or it performance its just as a normal un-covered one ? ...
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Old 07-05-2005, 05:51 PM   #5
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Serpent have a dyno reading on theirs. Not 100% sure how accurate it is.

I have run one a few times on a big block 15 in a serpent 835. I couldnt tell it was there except I couldnt hear my car over the noise of the other cars on the track.

Performance wise, I didnt notice a thing. My lap times remained the same.

From MyTSN
Quote:
Performance
Because of the optimized design, the INS-BOX unit does hardly affect the performance of the engine, it only reduces the induction noise. The performance was measured in various ways: by taking lap-times (no difference), by using data-logger technology (no difference), and on the test bench (approx. 3% difference). What can be felt is a very little loss of throttle response at low speed. But this will be the same for everybody of course. Running the car with or without the INS-BOX has no influence on the setting of the carburetor, which is proof that the air-flow is not restricted.
Using the INS-BOX has no effect on the engine temperature as it does not restrict the airflow and the engine is not running leaner.

It does keep foam dust, dust and crap from getting directly onto your filter, however you would be a fool to use it as a method to negate filter maintenance. It would also be handy for those of you who race in less than dry conditions.
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Old 07-06-2005, 03:23 PM   #6
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Thanks guys!!
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Old 07-06-2005, 04:19 PM   #7
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it does help on mileage and thats the only advantage i can think of.
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