View unanswered posts | View active topics It is currently November 12th, 2024, 5:26 pm



Reply to topic  [ 9 posts ] 
 Free Flow Cross Box - How 2! 
Author Message
gym bunny
User avatar

Joined: December 8th, 2008, 4:08 pm
Posts: 806
Location: Burton-upon-Trent
Post Free Flow Cross Box - How 2!
As fitted to my Ami 8 when playing with air filters and exhausts:

Image

Image

Image

Image

Image

Also removed the silencer from the side pipe and made it exit half way along the rear door and fitted a high flow air filter! (All MOT Pass)

usual disclaimers... remember its your car, not mine, and play safe!

_________________
Image
1299cc FTW


November 11th, 2009, 7:24 pm
Profile WWW
Firing on two.
User avatar

Joined: July 27th, 2009, 10:43 am
Posts: 306
Post Re: Free Flow Cross Box - How 2!
grrrrrrrrrrreat. Thanx, Got something to do. I just need tot get my box off :? i think itl turn to rust dust first! :mrgreen: :mrgreen:

_________________
Image

getting there slowly.


November 14th, 2009, 9:30 pm
Profile

Joined: December 20th, 2009, 10:00 pm
Posts: 11
Post Re: Free Flow Cross Box - How 2!
Hi all there!!

Does this cylindrical exhaust muffler have the same inner distribution as the one shown in those pics? I mean, those two chambers?

Image

Does anyone have a picture of this cylindrical 2 to 1 exhaust open wide?

Thanks in advance.

.


February 4th, 2010, 11:42 pm
Profile
Agony Aunt - You have a car problem? Speak to Ken

Joined: March 6th, 2009, 1:40 am
Posts: 3675
Post Re: Free Flow Cross Box - How 2!
Ummm,
don't forget that by getting rid of the baffles inside the crossbox, the primary pipe lengths will no longer be as close as possible to being the same length.

The result may well give more noise, but in all probability it will also give less power where you need it for use on the road.

Believe it or not, Citroen did know what they were doing when they designed these cars, including their individual parts... :roll:

ken

( p.s. @ chicago.
The Walker crossbox has a different arrangement for its baffles, but the general idea is the same, to equalise the paths from inlet to outlet for both cylinders. )

_________________
Image


February 5th, 2010, 12:24 am
Profile
Firing on two.
User avatar

Joined: January 5th, 2009, 5:48 am
Posts: 1687
Location: Haven't a clue
Post Re: Free Flow Cross Box - How 2!
Is this what you're after?

Image

Ken's right as usual, but I didn't let that sort of thing stop me from cutting mine up.
viewtopic.php?f=5&t=137

_________________
Image


February 5th, 2010, 2:37 am
Profile

Joined: December 20th, 2009, 10:00 pm
Posts: 11
Post Re: Free Flow Cross Box - How 2!
Thank you much for this pic,...But now I wonder what the exhaust gases paths are. It is easy to see in the previous sandwich-shape as in this pic.

Image
By chicago49, shot with N70-1 at 2010-02-03

Any schematic or drawing about what would the gases paths be in the cylindrical muffler?,

Thanks in advance.

Chicago.


February 5th, 2010, 4:18 pm
Profile
Firing on two.
User avatar

Joined: January 5th, 2009, 5:48 am
Posts: 1687
Location: Haven't a clue
Post Re: Free Flow Cross Box - How 2!
If I could do that clever thing with the arrows I would, but for me it would be quicker to take the box off the car, cut it open again, and draw the arrows with a marker pen. But I'll try to explain it.

Imagine the chambers are numbered 1 to 4, with 1 being the closest where you can just see the exit pipe.
The gas enter the box into chambers 2 & 4, and enters the perforated pipe through the holes,
It flows along the pipe and exits through the holes into chamber 3, where it enters the solid pipe through the few holes drilled in it.
It then flows up the solid pipe to chamber 1 and out the exit.
Note, the solid pipe is blocked at the far end, in camber 4, the perforated pipe is also blocked here, right at the very end.
the perforated pipe is also blocked where it enters chamber 1.

HTH!

_________________
Image


February 6th, 2010, 1:15 am
Profile
Firing on two.

Joined: April 22nd, 2009, 11:06 pm
Posts: 3684
Location: Ecosse
Post Re: Free Flow Cross Box - How 2!
chicago wrote:
Hi all there!!

Does this cylindrical exhaust muffler have the same inner distribution as the one shown in those pics? I mean, those two chambers?

Image

Does anyone have a picture of this cylindrical 2 to 1 exhaust open wide?

Thanks in advance.

.

Image

there is internal baffles at each outer 1/3 area the rh as seen from my pic is the exit
the middle section has an internal pipe from halfway to the outlet 1/3 for the RH cyl theLH goes in to the LH 1/3 where it has a seperate pipe running the full length of the box to the RH exit 1/3. the pipe tracks are of different lengths but are most definatley of "tuned" lengths

and as Ken states a gutted exhaust just means more noise and poorer driveability, the above dead box was a superb one that just seemed sweet mid to top range and had been put back on after replacing it with a new one which just didnt feel right.

As a "get it going while im waiting to get paid" an old gutted box from the pile of discarded race stuff was used, all it does is make more noise and lets the engine rev a bit higher but the 4k to 5.5k is gutless and thats where i do most of my driving.

I wouldnt recomend it to anyone, stick to the Walker crossbox and get a straight thru torpedo if you can.

the above catastrophy was caused by the 2nd boyer unit developing a fault the resulting misfire and ultimatley explosion was just too much for the old box that has been in service for about 15 years :cry:

Sean

_________________
Kissing the Lash
Image
"Any advice of a technical nature is given on the understanding that I've actually done this shit, not just read about it in D*lly club mag some time ago.


May 5th, 2010, 10:22 am
Profile
Firing on two.
User avatar

Joined: January 12th, 2010, 10:33 am
Posts: 193
Location: Koudekerk ad Rijn, Netherlands
Post Re: Free Flow Cross Box - How 2!
:D

but it sure gives a nice sound!

other option with WALKER (and only Walker) is to make an extra exhaust on the other side, drill a hole weld in a short piece of pipe ( to connect the middle pipe) and cut and weld all other exhaust parts mirrored from the 'normal' side. had some good results with this in combination with my visa engine, don't know if there is any noticeable difference if you have a stock 2cv6 engine. like this: http://www.2cv-power.de/tuning/rennausp ... uspuff.htm (if your german isn't that good, try using google translate, or just take a look at the pics)

greetzzzzzzzzzzz

Rusty

_________________
bitten by the Citobug...

Image


May 11th, 2010, 11:23 am
Profile
Display posts from previous:  Sort by  
Reply to topic   [ 9 posts ] 

Who is online

Users browsing this forum: HMW and 12 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group.
Designed by STSoftware for PTF.