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-   -   Trumpet filter (http://www.clubcobra.com/forums/gt40-talk/109140-trumpet-filter.html)

BMK 02-12-2011 02:37 PM
Trumpet filter
 
Hi all,
:confused:
I currently have foam filters pulled over the trumpets and wondering if anyone had an idea of a supplier of a filter. I also have tea strainers that I swap on but have not used foam with them, just the wire strainer - they are ideal on track days stopping small stones going down the throats. The trumpets are held on with 3/14 stainless bolts.
:confused:
But any alternatives would be ideal.
Thanks
Bernie

Dwight 02-12-2011 08:29 PM
Bernie, I am searching for better filters for my GT 40 setup. There are several threads on the GT 40 about this.

Do a search on weber filters or trumpets

http://www.gt40s.com/forum/

Dwight

I'm still looking. I may build my own. But I hate to hide my injection system.

http://www.clubcobra.com/photopost/d...intake_014.jpg

OZCOBRA 02-12-2011 09:33 PM
Quote:
Originally Posted by Dwight (Post 1109580)
As good as these look they do restrict the flow on a bell top trumpet as it stops the flow over the edge and changes the flow pattern through the mouth....an air box surrounding away from the bell top with some form of panel or pod filter would be an ideal!! :)

Dwight 02-13-2011 06:36 AM
I've seen boxes with a flat filter on the top and others with a tradition filter with a plate on the top, like the carb filters.
One with plexglass so you could see the injection system. A little bit of both worlds.

Still looking.
Dwight

BMK 02-22-2011 11:50 AM
dWight

Is the Gt40 in the photo your vehicle or do you know where the mesh filter tops are available? They would be ideal as my concern is stopping the stones/gravel going down...

Thanks
Bernie

bobcowan 02-22-2011 03:43 PM
Quote:
Originally Posted by BMK (Post 1109505)
Hi all,
:confused:
I currently have foam filters pulled over the trumpets and wondering if anyone had an idea of a supplier of a filter. I also have tea strainers that I swap on but have not used foam with them, just the wire strainer - they are ideal on track days stopping small stones going down the throats. The trumpets are held on with 3/14 stainless bolts.
:confused:
But any alternatives would be ideal.
Thanks
Bernie
The tea strainers cost me 100hp on the dyno. Most of the restriction comes from the rubber lip, but some does come from the foam. On the track, I use open stacks.

A few years ago, I got the bright idea to replace the foam with gauze filter element from K&N. The engine ate 3 of them. The rest went into the trash.

Dwight 02-22-2011 03:50 PM
Bernie
yes that is my GT 40. I'll with check and see if I can find out were Allan bought them.


Dwight

BMK 02-22-2011 05:25 PM
Thanks Dwight much appreciated

bernie

Dwight 02-23-2011 03:53 AM
trumpets filters
 
Allan said they came with the set up but he has seen them in the Pegasus Racing catalogs.

Dwight

BMK 03-02-2011 02:19 AM
This is the current setup on the GT40

BMK 03-02-2011 02:20 AM
http://www.clubcobra.com/photopost/d...ctures_092.jpg

Pumpkin 03-02-2011 12:10 PM
trumpet screen/filters
 
Hi,
I run webers (ida48) and have obtained my screen filters from Pierce Manifolds in Gilroy CA.
Glenn

Rick Parker 03-02-2011 01:26 PM
The largest share of the volume of air into the stacks comes not from directly above but from the side. The OEM stacks with the non rounded edge shears the air as it is drawn into the stack. The others with a more rounded edge promote better flow. In my opinion the placement of any individual screens (such as the sanwiched foam OEM type) or the more recent production "Stainless Mesh" type which have a rubber band around the perimeter and secure themselves around the edge of the individual stack will cause a disruption of air flow at the outer edge and a resulting reduction in performance. This may only become really appearant at WOT because up to that point anything can be compensated for by further depression of the throttle, but will be felt to a minor degree throughout the operating range. Admittedly a big part of the mystic of the Webers is their no holds barred appearance, but the box type filters, such as those from TWM and others will most likely provide a better overall package because there is more filtering area and a larger "filtered plenum" from which the individual stacks pull the air. You dont see individual filters on the injector stacks on F1 cars, there is a reason.

BMK 03-14-2011 04:00 AM
Thanks for your help and advice.

Bernie

Gaz64 03-14-2011 04:39 AM
Quote:
Originally Posted by Rick Parker (Post 1113176)
The largest share of the volume of air into the stacks comes not from directly above but from the side. The OEM stacks with the non rounded edge shears the air as it is drawn into the stack. The others with a more rounded edge promote better flow. In my opinion the placement of any individual screens (such as the sanwiched foam OEM type) or the more recent production "Stainless Mesh" type which have a rubber band around the perimeter and secure themselves around the edge of the individual stack will cause a disruption of air flow at the outer edge and a resulting reduction in performance. This may only become really appearant at WOT because up to that point anything can be compensated for by further depression of the throttle, but will be felt to a minor degree throughout the operating range. Admittedly a big part of the mystic of the Webers is their no holds barred appearance, but the box type filters, such as those from TWM and others will most likely provide a better overall package because there is more filtering area and a larger "filtered plenum" from which the individual stacks pull the air. You dont see individual filters on the injector stacks on F1 cars, there is a reason.
A plenum box (like K&N for sprintcars) offers multiple times the filter area per cylinder with a volume of filtered air for each cylinder to draw from unrestricted.

No single airfilter can deliver enough airflow that IS clean.

Some only filter down to .009.

That's still going to sandblast your motor.

Alan P. 03-28-2011 08:36 PM
Bill's Filters are some of the best available.
We've used them on our GT40R's with both Webers and fuel injection and have no complaints.

http://www.bills-b-racing.com/

CHANMADD 03-28-2011 11:58 PM
I always thought that the area under the rear window was a plenum.
Why not get some nice filter in the intake vents above the rear wheels?
Then it will catch any stones coming in and a plate of lexan or the like cut out fit around the trumpets with a little foam seal around each trumpet and to the engine cover...??:)

PoppyMod 03-08-2012 03:50 PM
Quote:
Originally Posted by BMK (Post 1111526)
dWight

Is the Gt40 in the photo your vehicle or do you know where the mesh filter tops are available? They would be ideal as my concern is stopping the stones/gravel going down...

Thanks
Bernie
Hi,
Google "Bill Hirsch". I'm running his filters on my Webers. He'll do custom colors, as well.


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