When is an air filter 'Dirty'

GlenQ

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Just checked my air filters. The filter box was full of dead flies. The filters themselves did not seem too bad just a little discoloured. How do you really know when it's time to change them:confused:
 

Whitey

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Good questions. I think they are just replaced in due course rather than being 'dirty'.

I bet in other countries they have more reason to need to be changed - ie dusty climate.

Chris
 

davidjpowell

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Moons ago I had a Renault Laguna II, which had been my company car from new.

I had left the firm, but returned shortly afterwards. In between the car had been crashed. When it returned to me it also needed a service. After this fuel consumption was down by 5 mpg... Noticeable.

Took the dealer 3 trips to spot an air filter full of 'cellulose'. Not sure why it had not been changed at the service in any case.

A dirty fuel filter is going to use more fuel, or I imagine potentially 'strangle' an engine.
 

wemorgan

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I've just replaced the air and cabin filter in my car. I think there's little argument mine needed doing.

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Zi6_0126.JPG
 

Dieselman

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The colour isn't a good indicator of blockage, really you need a manometer.
 

Number_Cruncher

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A unit like this is used to monitor air filter efficiency on commercial vehicles;

ebay item 200622486388

Mercedes trucks used to have an indicator on the dashboard where a sensitive differentiual pressure gauge would reveal a red flag as the filter blocked. It probably wouldn't be too difficult to obtain one and use it - you could argue it would be a better use of dashboard space than the gimmicks usually found there.
 

tim.100

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A unit like this is used to monitor air filter efficiency on commercial vehicles;

ebay item 200622486388

Mercedes trucks used to have an indicator on the dashboard where a sensitive differentiual pressure gauge would reveal a red flag as the filter blocked. It probably wouldn't be too difficult to obtain one and use it - you could argue it would be a better use of dashboard space than the gimmicks usually found there.


Some Land Rover Defender diesels had a visual gauge in the engine bay (on the air filter canister) in the 1990's Tdi 200 models.
 

Dieselman

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Some Land Rover Defender diesels had a visual gauge in the engine bay (on the air filter canister) in the 1990's Tdi 200 models.

As do some Mercedes cars.
 

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