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Unread 06-13-2013, 07:20 PM   #1
Registered User
1985 CJ7 
Join Date: Jul 2012
Posts: 10
Air Intake Housing

Hey everyone

Does anyone know of any mods for air intake housing for 4.2L 258 '85 cj7?

I lost/threw out air intake housing for original 2bbl carter weber carb and can't seem to locate a new one that is affordable. eBay is $150-200 plus shipping. There has to be a cheaper and easier fix?!

I would think it would be fairly easy to mock up a housing out of ABS to fit a newer much smaller diameter air filter

Thanks for assistance in advance.

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Unread 06-13-2013, 08:20 PM   #2
Registered User
1981 CJ7 
Join Date: Jul 2009
Location: Bali, Indonesia
Posts: 5,189
Welcome to the Forum. Fill out your Profile and you will get more specific answers, still wrong but specifically wrong.

Sounds like you are off to the scrapyard shortly!!!! The Thermostatic Air Cleaner is a much misunderstood and underrated part of the AMC258, it handles cold air, hot air, water and dust which off road is a greater hazard than for road vehicles.

The Carter BBD was popular with most manufacturers in the day so you may be able to find a TAC that fits from another make. In fact any TAC can be made to fit with an aluminium plate, a drill and a jigsaw, just cut out the TAC until it fits over the BBD and then fabricate an aluminium plate to fasten / glue / seal in the bottom of the TAC over the carb.

Alternatively you could buy one of those chrome pancake filters and cut out the right shape in the bottom and drill out some screw holes. However it will never work as well as it will be prone to water kicking up in the engine bay whilst wading and will not duct in hot or cold air as needed by the engine.

As to size of filter, the bigger the better. You will want to take your Jeep to muddy, dirty, sandy places and a larger filter will last better. I know that K&N etc are rated but an ordinary, large and cheap paper one is just as good.
BagusJeep lives in Bali.

1981 CJ7 258ci - Bagusjeep
1984 CJ7 258ci - Puthijeep
1981 J20 258ci - Gladys
1951 Willys CJ3A/MB/M38 - Little Willy
1995 Cherokee 4.0 - CHEROKEE
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