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busey
Samba Member
Joined: October 19, 2016
Posts: 420
Location: Sun City Arizona
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 Posted: Sat Dec 28, 2019 7:15 pm Post subject: Foam filter sputter |
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Finally had my 48 IDA powered 2275 running smooth until i decided to add Jaycee foam stack filters today. Idle is smooth, BUT sputters upon acceleration on thru the mid-range, and will smooth out again when i pedal to the metal it. I take the filters off and it runs smooth again 
H - E_ L - P !
I could just run without air filters but Phoenix Arizona is so damn dusty and rocky that i worry some crap will make its way in the motor thru the stacks. 
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sled
Samba Member
Joined: February 16, 2005
Posts: 6179
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| Posted: Sat Dec 28, 2019 7:39 pm Post subject: Re: Foam filter sputter |
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stack filters are known to be quite restrictive, which is probably changing your jetting. The best situation is to run full size filter elements around the velocity stacks.
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Glenn 
Mr. 010
Joined: December 25, 2001
Posts: 76884
Location: Sneaking up behind you
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| Posted: Sat Dec 28, 2019 7:42 pm Post subject: Re: Foam filter sputter |
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"
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busey
Samba Member
Joined: October 19, 2016
Posts: 420
Location: Sun City Arizona
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| Posted: Sat Dec 28, 2019 7:51 pm Post subject: Re: Foam filter sputter |
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| sled wrote: |
| stack filters are known to be quite restrictive, which is probably changing your jetting. The best situation is to run full size filter elements around the velocity stacks. |
That does remind me that a few years ago there were some air filters on the market that were not of the foam variety but more like regular air filters that ran individually off the stacks at abit of an angle. 
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busey
Samba Member
Joined: October 19, 2016
Posts: 420
Location: Sun City Arizona
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| Posted: Sat Dec 28, 2019 7:54 pm Post subject: Re: Foam filter sputter |
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Those look like foam as well. Are those restrictive to the point that they throw off your jetting?
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Glenn
Mr. 010
Joined: December 25, 2001
Posts: 76884
Location: Sneaking up behind you
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busey
Samba Member
Joined: October 19, 2016
Posts: 420
Location: Sun City Arizona
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| Posted: Sat Dec 28, 2019 8:24 pm Post subject: Re: Foam filter sputter |
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That might just be the fix! Thanks
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oprn
Samba Member
Joined: November 13, 2016
Posts: 12687
Location: Western Canada
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| Posted: Sat Dec 28, 2019 9:16 pm Post subject: Re: Foam filter sputter |
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| Perhaps not all Webers are like this but my Webers take air in for the idle circuit from between the stacks. The idle jets would quickly plug with road dust using those filters. |
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HBRag
Samba Member
Joined: April 29, 2005
Posts: 735
Location: Huntington Beach, CA
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| Posted: Sat Dec 28, 2019 10:00 pm Post subject: Re: Foam filter sputter |
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| Restrictive or not, the AFR will change with and without filters. I have the traditional CB style filters, and the AFR goes lean without them. I’d expect to have to re-jet with them on. Do you have an AFR meter? |
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busey
Samba Member
Joined: October 19, 2016
Posts: 420
Location: Sun City Arizona
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| Posted: Sun Dec 29, 2019 8:43 am Post subject: Re: Foam filter sputter |
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| HBRag wrote: |
| Restrictive or not, the AFR will change with and without filters. I have the traditional CB style filters, and the AFR goes lean without them. I’d expect to have to re-jet with them on. Do you have an AFR meter? |
I Don't, but i have read that Aircooled.net rents them out. So that will be the next tweak to make with filters On, since the motor is just about broken-in and got her to run consistently smooth thruout the power band w/filters Off AND even without a 3rd progression hole 
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67rustavenger
Samba Member
Joined: February 24, 2015
Posts: 9749
Location: Oregon
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| Posted: Sun Dec 29, 2019 9:03 am Post subject: Re: Foam filter sputter |
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| busey wrote: |
| HBRag wrote: |
| Restrictive or not, the AFR will change with and without filters. I have the traditional CB style filters, and the AFR goes lean without them. I’d expect to have to re-jet with them on. Do you have an AFR meter? |
I Don't, but i have read that Aircooled.net rents them out. So that will be the next tweak to make with filters On, since the motor is just about broken-in and got her to run consistently smooth thruout the power band w/filters Off AND even without a 3rd progression hole |
ACN does not rent that tool any longer.
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busey
Samba Member
Joined: October 19, 2016
Posts: 420
Location: Sun City Arizona
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| Posted: Sun Dec 29, 2019 9:57 am Post subject: Re: Foam filter sputter |
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| 67rustavenger wrote: |
| busey wrote: |
| HBRag wrote: |
| Restrictive or not, the AFR will change with and without filters. I have the traditional CB style filters, and the AFR goes lean without them. I’d expect to have to re-jet with them on. Do you have an AFR meter? |
I Don't, but i have read that Aircooled.net rents them out. So that will be the next tweak to make with filters On, since the motor is just about broken-in and got her to run consistently smooth thruout the power band w/filters Off AND even without a 3rd progression hole |
ACN does not rent that tool any longer. |
 Ah Damn! Thanks for the heads up.
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jeffrey8164
Samba Member
Joined: January 06, 2018
Posts: 3813
Location: Georgia
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| Posted: Sun Dec 29, 2019 10:41 am Post subject: Re: Foam filter sputter |
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They don’t rent them anymore because they are relatively inexpensive now.
Sub $200.00
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RailBoy
Samba Member
Joined: March 10, 2008
Posts: 2904
Location: Virginia
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| Posted: Sun Dec 29, 2019 2:47 pm Post subject: Re: Foam filter sputter |
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None Oiling and Synthetic I do Believe, R2C's..... Been running mine now for 4,250 Miles......
http://www.r2cperformance.com
RB
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UK Luke 72
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Location: Little Britain
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RailBoy
Samba Member
Joined: March 10, 2008
Posts: 2904
Location: Virginia
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| Posted: Sun Dec 29, 2019 3:43 pm Post subject: Re: Foam filter sputter |
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Yea, I think so as well.... It is a street car so can't be so bad with dust and all...
If I do blow them out, it would be from the inside out of course with just lightly canned air...
But they have not come off and cleaned yet, knock on wood, lol..
Kinda a test... RB
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busey
Samba Member
Joined: October 19, 2016
Posts: 420
Location: Sun City Arizona
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| Posted: Sun Dec 29, 2019 5:51 pm Post subject: Re: Foam filter sputter |
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Question, rarely are 48 IDAs equipped with any kind of filtering even on the street. Can't be that bad to run them as they have been for many many decades, ie w/OUT filters???
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66brm
Samba Member
Joined: January 25, 2010
Posts: 3676
Location: Perth Western Australia
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| Posted: Sun Dec 29, 2019 5:54 pm Post subject: Re: Foam filter sputter |
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I would never run an engine on the street without filters, track and dyno are different
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67 Sunroof
Samba Member
Joined: February 22, 2014
Posts: 1836
Location: Salisbury, MD
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| Posted: Sun Dec 29, 2019 7:43 pm Post subject: Re: Foam filter sputter |
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Man, GREAT idea with the springs holding the wingnuts on the air filters! I’m gonna do that to mine as well. Motor looks great man! Glad it is still running great for ya!
| RailBoy wrote: |
Yea, I think so as well.... It is a street car so can't be so bad with dust and all...
If I do blow them out, it would be from the inside out of course with just lightly canned air...
But they have not come off and cleaned yet, knock on wood, lol..
Kinda a test... RB |
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RailBoy
Samba Member
Joined: March 10, 2008
Posts: 2904
Location: Virginia
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| Posted: Mon Dec 30, 2019 5:02 am Post subject: Re: Foam filter sputter |
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Thanks Roof, yea be careful drilling, I used both a hand held drill for two of the holes before I remembered I had a drill press at the location I was at doing it, both ways you could see the bit flexing, but did not break it during the drilling, vey small bit.. lol... RB
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