Trumpet Socks: How Bad/good/effective/rubbish Are They...

[Stu 18]

 

Yeah ive got no problem in ditching the slam panel, im more concerned with the backing plate for the air filter hitting the bonnet.

 

Has anyone got the dimensions of a panel filter backing plate to hand? I remember seeing a template knocking around a while back but i searched earlier and couldnt find it...

[Sandy 191]

Use the ITG upside down, that's the best for clearance.

 

Yes John, it was your car I was talking about! Sounds like you had exactly the same Phil.

[rapidcossie 0]

i have ran with no slam panel for months now with no problems

[welshpug 1,661]

Stu, BIC has made a set of spacers that alter the angle of his bodies to fit the EW lump under the bonnet of his 106, might be worth asking if he has any spare or could make some more?

[DrSarty 90 1 Cars]

I agree with losing the slam panel in this instance.

 

I had a little bit of bonnet spar clearance even though I mounted my ITG filter 'upside down' as also suggested. This moves the fixing 'tangs' underneath, and if you offset the holes for the carbs/trumpets into the backplate you can have the filter assembly lower down, (hopefully) clearing your bonnet.

 

My mate Pronta!!!

 

I also run an 18" wide, lightweight, heat and airflow deflector, which is mounted above the rad, painted silver and directs airflow up into the filter from underneath. Probably makes bugger all difference but it makes sense, and the engine runs excedingly well.

 

Edited July 10, 2009 by DrSarty

[rapidcossie 0]

i just rasied my bonnet by an inch and cut the grill.

 

gets lots of air to the trumpets.

 

 

Edited July 10, 2009 by rapidcossie

[sideways danny 0]

I also run an 18" wide, lightweight, heat and airflow deflector, which is mounted above the rad, painted silver and directs airflow up into the filter from underneath. Probably makes bugger all difference but it makes sense, and the engine runs excedingly well.

 

 

 

They do !!!! tried it on the dyno, reduced intake temps from ~40 degrees to 24 max, and made 4bhp more (on a clio 172)

[johnnyboy666 195 1 Cars]

are those guaze things any good johnny? i'm tempted but i havent seen one up close and i dont want to order some and they turn out to be like a tea strainer or summit

[jonnygoodhand 0]

are those guaze things any good johnny? i'm tempted but i havent seen one up close and i dont want to order some and they turn out to be like a tea strainer or summit

 

They seem fine to me, but as I've nothing to compare them against, I'm afraid I can't say for sure...

[tri_longer 25]

are those guaze things any good johnny? i'm tempted but i havent seen one up close and i dont want to order some and they turn out to be like a tea strainer or summit

 

Funny you should mention tea strainers, at Harewood a couple of weeks ago, a guy with a motrobike engined single seater was running tea strainers (handles included) as his air filters.

[engine killer 6]

I tried using the sock filters, but they got sucked into the trumpets so I ditched them and got ITG to make a custom bar filter to fit - I just gave them the clearances all round and it turned up with a few mm spare around the edges - not cheap, but it works great.

 

 

after a search in Pipercross website, is box type better than domed type filter?

 

http://www.pipercross.net/competition/products_px600.asp

 

with the similar height box type can cope with higher power.

[notamondayfan 44]

I run these -

 

 

There's a rule of thumb regarding trumpet length and the distance from the front on the filter box, but I cant remember what exactly it was, I just went with the set-up recommended to me from my local motor sport place. Can't say I have noticed any lack of power, and there's no real issues with space either.

 

Dean

[wardy18 33 1 Cars]

here's a bit of a brain teaser that I've pondered over for a while but never tested different set ups tp over come! I run twin 45's which are completely exposed throu a non existant grill and very much lowered rad running pipercross socks!

 

Car runs fines on current set up with socks on

 

But......... If I remove socks and leave open to elements gaining direct air straight into the engine will not rev over about 3k rpm on load.........what's that all about??

 

Sorry to highjack thread just thought it might be a good point to raise to help me and hopefully others!

 

Ill gets pics of my set up and layout tomorrow

[rapidcossie 0]

think general rule is 20mm from end of trumpets

[sideways danny 0]

here's a bit of a brain teaser that I've pondered over for a while but never tested different set ups tp over come! I run twin 45's which are completely exposed throu a non existant grill and very much lowered rad running pipercross socks!

 

Car runs fines on current set up with socks on

 

But......... If I remove socks and leave open to elements gaining direct air straight into the engine will not rev over about 3k rpm on load.........what's that all about??

 

Sorry to highjack thread just thought it might be a good point to raise to help me and hopefully others!

 

Ill gets pics of my set up and layout tomorrow

 

I can't think of a single reason for that. It's normal practice to map /setup with the filters off on the dyno

[welshpug 1,661]

probably that they haven't been RR setup and have been made to work at their best with the socks on, might be running a bit lean with the sock off if they are restrictive as people have found?

[bales 1]

here's a bit of a brain teaser that I've pondered over for a while but never tested different set ups tp over come! I run twin 45's which are completely exposed throu a non existant grill and very much lowered rad running pipercross socks!

 

Car runs fines on current set up with socks on

 

But......... If I remove socks and leave open to elements gaining direct air straight into the engine will not rev over about 3k rpm on load.........what's that all about??

 

Sorry to highjack thread just thought it might be a good point to raise to help me and hopefully others!

 

Ill gets pics of my set up and layout tomorrow

 

I would have said the reason for that is that the airflow directly into the carbs is leaning the mixture out especially at higher speeds. With the filters you are slowing the air down massively, the ram effect is not about getting the air down fast its about getting it down slightly pressurised and the only way to do that is do have a specially designed inlet that drafts outwards once the air has entered. So there is no benefit of having the air directly down the bodies as you wont get a ram effect anyway at the speeds you go.

 

So I would say that the idea is to maintain a cool dense airflow to the engine not neccessarily a high velocity supply, and that by running the inlets in the direction of flow of the car you are messing up the flow dynamics of air/fuel mixing process.

 

You never see open inlets on race cars with the airflow directly down the inlets they are either at 90 deg to the air flow or with an airbox directing the flow downwards into the engine....

[wardy18 33 1 Cars]

ok so an like a home made airbox with a large panel filter at the front is ideal for a 205 set up then so the air is pushed and filter into the airbox and gives plenty of air into the carbs without forcing it down!

 

I think ill try and fix the filters to make them more secure so that it maintains 20mm from the end of the trumpet!

[engine killer 6]

So I would say that the idea is to maintain a cool dense airflow to the engine not neccessarily a high velocity supply, and that by running the inlets in the direction of flow of the car you are messing up the flow dynamics of air/fuel mixing process.

 

You never see open inlets on race cars with the airflow directly down the inlets they are either at 90 deg to the air flow or with an airbox directing the flow downwards into the engine....

Hmmm, I am starting to understand more. As a layman term, more fuel and more air will give higher power. With a high velocity supply of air, it will mess up the air/fuel mixing process probably due to too short the length between injector tip and back of valve. What if an extra injector is located right at the tip of trumpet lip, this will lead to a 8 injectors system a remap to balance out weighting of injectors. Will this be a solution to fix the high velocity air supply and give higher power?

 

Am I thinking too simple here

[engine killer 6]

Dear all, I am thinking of getting these instead of socks, any comment?

[Sandy 191]

Round edge ones give better clearance, otherwise :thumbs:

[engine killer 6]

Round edge ones give better clearance, otherwise :thumbs:

But if you look at the backplate drawing, if gives a better clearance to avoid fouling the injectors (mine is Jenvey's 91mm TH bodies, which a simple plane flat backplate is impossible).

 

actually, I also worry about getting a replacement filter will be a nightmare after a few years.

[engine killer 6]

Round edge ones give better clearance, otherwise :thumbs:

 

 

By the way, do you mind tell me is there any difference between the round one and the box one?

 

Thanks!

[Sandy 191]

Sorry, a point I missed earlier, that one and the PX, have flanges sticking out on both sides. The ITG has a lower lip on the hinge side which is a big help for clearance. Use Pico injectors and life is fine with TH bodies.

[sideways danny 0]

Dear all, I am thinking of getting these instead of socks, any comment?

 

good filter if you have the room. I've used that one on a clio 172 cup with a 50mm dished backplate to allow fitting of 120mm trumpets (should be PFC featured soon I think)

 

 

Had to slightly re-shape the filter to stop it rubbing on the bonnet.