sleeved cans

[milu]

sleeved my cans last night. what a difference,nice and gurgly with a bit more of a hollow sound.
total time 1 hour,total cost £5. bargain!!
mike.

[Mr Freefall]

milu said:

sleeved my cans last night. what a difference,nice and gurgly with a bit more of a hollow sound. total time 1 hour,total cost £5. bargain!! mike.

And back pressure increased due to smaller exit for gasses. Effect on engine, hmmmm wait and see...

Mr F

[Kurgen 34]

Heard one of the guys in the 24hr race at Silverstone had to add some silencer cans to his M3 to get pass the noise regs..
Apparently the resulting increase in back pressure blew out the rings during qualifying.. engine never made it to the race.!

quote..

Saturday 10th September
--------------------------------------------------------------------------------
Well, it was a nightmare day for us. Despite a new exhaust system, we failed scrutineering for noise, so fitted two 400bhp supertraps - and passed. The supertraps however caused so much back pressure that the engine oil rings went in morning practice, and then we lost a piston in qualifying. Our 2.10 lap was with the driver coasting down the pit straight before the car finally died!!

We REPLACED THE ENGINE!!!! Yep, before night qualifying (well, we missed twenty minutes of it) - only to have the session stopped due to the storm.

Car is raring to go, we are only 23rd which isn't where we should be, but the car is far quicker now with new additional silencers and no supertraps!!! What a huge effort by the team, including working till 5am this morning to finish things off. Hats off to Simpson Motorsport. I am gonna have my brekkie and get back to the circuit

Fingers crossed!!!!

[ChelseaTractor]

Cans sleeved from new by dealer, 6.5k miles later, no problems. Took out the corner silencers last week too.

Farking 'ell! Now thats a noise. Sounds very much deeper, pops and bangs like a machine gun.

Done a further 1k miles, still nothing wrong.

[milu]

i must admit i cant see it making much difference,its not like adding a silencer,its very thin walled pipe thats inserted.
mike

[Mr Freefall]

milu said:

i must admit i cant see it making much difference,its not like adding a silencer,its very thin walled pipe thats inserted. mike

A difference in back pressure, alters the pressure helping the valves close.

If you take the catts out, you have a new chip, if you get a sports exhuast fitted, TVR replace the chip.

There is a reason for this, its to do with the back pressure, gas flow and injector rating for fuel

Mr F

[Hot racer]

milu said:

i must admit i cant see it making much difference,its not like adding a silencer,its very thin walled pipe thats inserted. mike

What diameter and length of pipe do i need to sleeve mine? Been meaning to get round to doing it for ages.

[basil brush]

milu said:

i must admit i cant see it making much difference,its not like adding a silencer,its very thin walled pipe thats inserted. mike

You may find a very slightly smaller smooth walled pipe acttually flows better than the original perforated pipe. Has anyone ever tested it?