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Weber Air Filters
Hey gang,
I’m setting up some 48 IDA’s for a 289 in a Mustang, that will eventually make it’s way into a 289 FIA car. The Mustang has little more room for an air cleaner than I would assume the Cobra would have, so the discussion may be relevant. What are you all running for air cleaners? Most of the photos I see have either the screen that pops into the velocity stack (sold by Redline), or the mesh screen that pops over the velocity stack (black band around the bottom). Based on my rudimentary measurements, I don’t think I have room for something like a K&N (even the shortest one). I’ve seen a few people running the foam disc type filters, though I’ve heard they’re terribly restrictive. I’ve seen no one running UNI filters, which surprises me because they actually work pretty good on motorbikes. Is there anything that I’m missing? What would also be great, is if folks would post what effect whatever type of filter they ended up going with had on their jetting. Thanks for reading! Casey |
I run mine open, screens could help but its about the air intake and velocity.
There are folks that run the filters and I am unsure of how that works. I find restricting the air flow causes flooding. When I use a nylon sock with a fine mesh it is fine around town, problem comes when you hit the units wide open. =FLOODING So I am in year 6 with wide open stacks, screens would keep out large rocks but the fine dust dirt is no doubt the biggest issue. My $0.02 |
I have K and N on mine but have not actually been able to run it that way. I can testify that they do stick up pretty high.
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It's a situation if your car sits the motor like an original.
Weber's sit high in a FIA/SS buggy spring frame, cleaners might not clear the hood. Mine are the slightly taller alloy horns however it only leaves a 1" gap for cleaners to mount. |
Like Jeff (1985 CCX), I run with them open, albeit mine is just a race car. I was running the mesh screens initially but was told that even they are restrictive and will cost you about 50 HP. I can attest to that, as after I removed the screens there was a huge gain in performance.
If you will be driving in sandy areas or on gravel roads you might want some filtering. With a race car I am rebuilding the engine every couple of years so getting a little dust in there is not as concerning. |
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In 6 years have you experienced any real detriment to running open stacks? More frequent oil changes maybe? Any compression loss? Quote:
When you rebuild so often, are you able to “ring and bearing”, or are you finding the added abrasive in the system is wearing bores and journals too? What about valve guides? I would be very curious to take apart a motor with a couple years of use in dusty conditions just to see how much of the cautionary aspect of filtration holds true. |
Have not run in any real dusty conditions. Typical rebuild/refreshing is rings, bearings, valve springs and seals. Running an aggressive cam at high rpms on a continuous basis is tough on the springs, bearings and rings.
Jeff i right in that if you have an original style transverse leaf spring suspension, there is not a lot of clearance to the hood from the horns. |
Filters should always be used on motors....even if it’s a air box around the Weber’s with a filtered input opening.....
All of our race motors used filtration on air intake and we rebuilt based on the leak down test after every race.....usually every 10 hours we’d rebuild the motor because the valve would leak the most....which is dirt coming in thru the air intake .....once our leak down got to 15% to 20%...we’d rebuild motor....ingesting dirt/dust & reversion is the common component for loosing HP..... |
ITG filters are used by some. I have them on my engine. I wish I could find older thread with pictures of the engine showing filters, on and off, taken on Kroyer chassis dyno. Pictures had closeup in high definition.
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(I’m trying to glean some more info from this gentleman over on the VMF forum. |
FYI SAI did not use filters either
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I mean, I’m not trying to be a jerk...just pointing out that the thinking has changed on some things... |
Yes, I lightly oil them and have washed them. Four dealers in States now. Part number JC70/JC71
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Is that part number for the screens or filters?
Thanks, |
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Thanks for your help! |
https://imgur.com/a/f7J6D
If you click on pictures they get bigger. one side of filter/screen hooks on and three quick screws hold it on. Hope I answered both questions. Foam and screen are bonded |
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https://www.merlinmotorsport.co.uk/f..._tray_dims.pdf Allows the base to be fitted flat without the screens, don't need them since they will be supplied with filtered air. Also allows much easier jet removal than some other setups. |
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Would there be enough material to mill top of manifold to lower carbs?
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