 PMO/Weber rainhat/filter specfic question |
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| Cfletch |
 Nov 2 2025, 07:52 PM
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#1
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Member  Group: Members Posts: 204 Joined: 30-January 14 From: Santa Barbara Member No.: 16,941 Region Association: Southern California  |
Hey there, realized I made a dumb mistake on purchasing the incorrect height air cleaner from PMO. I have standard length velocity stacks on my webers, but I purchased the short air cleaner. The issue I am running into with this is the top of the filter assemble gives basically no clearance to the top of the stack causing lack of air getting into the carbs.
Specific question related to the standard length and short length from PMO. Is the only difference between these 2 parts from them, the stud lengths that attached the of the assembly as well as the filter element itself? I would think they use the same base and top, just the filter and studs change the length? I found where I can get both to convert to the standard height, but just want to be sure. Thanks! Wanted to be clear, this is for IDA3C on a 6 |
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| Cfletch |
Nov 2 2025, 08:01 PM
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#2
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Member Group: Members Posts: 204 Joined: 30-January 14 From: Santa Barbara Member No.: 16,941 Region Association: Southern California |
Maybe a follow up question, whats the correct size for a 914? Short or regular? PMB suggests short, but it looks like I have enough clearance on the engine lid to where standard height would not be any issue.
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| dtmehall |
Nov 2 2025, 08:14 PM
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#3
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Member Group: Members Posts: 199 Joined: 21-December 23 From: Farmington Hills, Michigan Member No.: 27,808 Region Association: Upper MidWest |
i am running weber 40idfs on my 914
here is what i ordered from cb performance, and the fit and work fine 3310 2 1/2" Air Filter Assembly (Single) IDF & DRLA https://www.cbperformance.com/product-p/3310.htm |
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| dtmehall |
Nov 2 2025, 08:16 PM
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#4
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Member Group: Members Posts: 199 Joined: 21-December 23 From: Farmington Hills, Michigan Member No.: 27,808 Region Association: Upper MidWest |
sorry, i didn't notice that you are running velocity stacks
ignore my post |
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| Cfletch |
Nov 2 2025, 09:29 PM
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#5
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Member Group: Members Posts: 204 Joined: 30-January 14 From: Santa Barbara Member No.: 16,941 Region Association: Southern California |
Edited my post to be more specific, this is for a 6 cyl car sorry!
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| sixnotfour |
Nov 2 2025, 09:57 PM
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#6
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914 Wizard Group: Members Posts: 11,013 Joined: 12-September 04 From: Life Elevated..planet UT. Member No.: 2,744 Region Association: Rocky Mountains 
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the short stacks and air filters used to be meant for 911s with ac..
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| infraredcalvin |
Nov 2 2025, 11:27 PM
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#7
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Distracted Member Group: Members Posts: 1,693 Joined: 25-August 08 From: Ladera Ranch, CA Member No.: 9,463 Region Association: Southern California
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There are short intake manifolds and short stacks/filters available.
I run the tall intake manifolds and standard height stacks/filters with 46 webers with no fit issues. |
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