6" or 7" silencer

[Steve M]

Hello all

Continuing my nightmare quest to sort an exhaust system for my car. I've settled on a raceline manifold with 2 1/4 link pipe but now I'm on the hunt for a carbon silencer

Motad can supply a silencer( 6 INCH NOT 7) in carbon in aprox 3 weeks as they are waiting on carbon

Simpson ( can supply 7 inch ) who advertise on there website ' we now supply repackabke silencers' I'm looking at 4 weeks before availability !

After speaking to Raceline this morning I was advised to definitely go for a 7 inch silencer ( they don't sell 6 inch) if I was thinking of doing track days due to noise regs

Are people using 6 inch silencers & having any trouble with noise ? Or is 7 inch the way to go ?

[Terry Everall]

The bigger the better as Size does count!!!

[Dave Eastwood (Gadgetman)]

Bigger is definitely better. You can achieve good results with a six inch can too, but generally it then relies on it being as long as possible, and more critically, not too large a bore perforated pipe through the centre.

 

For instance, my last Simpson's system had a 3" bore from the last collector to the tip of the tail pipe. At that bore, even 7" inch was a bit on the small size!

[Kit Car Electronics and Essex AO]

I have a Simpson's 7x29" can on a 2.0 zetec- always comes in at about 93dB for ref.

[Dave Eastwood (Gadgetman)]

I have a Simpson's 7x29" can on a 2.0 zetec- always comes in at about 93dB for ref.

 

Same size on my old XE car, but the 3" bore and QED Q450 cams meant I struggled around the 97/98 db mark.

[CL290005]

My can is built by a local company measures 6x24 on zetec recorded 92-93db at Cadwell last week but has internal spinners in the inner tube

[Steve M]

I have a Simpson's 7x29" can on a 2.0 zetec- always comes in at about 93dB for ref.

Mine would be going on a zetec 2.0, 285 cams linked to a raceline manifold

Could you post a pic or two up of the silencer & silencer/ link pipe please, would be very grateful

[TableLeg]

Julian at Aerodynamix can get these http://www.aerodynamix.co.uk/exhausts.html

[Kit Car Electronics and Essex AO]

Mine would be going on a zetec 2.0, 285 cams linked to a raceline manifoldCould you post a pic or two up of the silencer & silencer/ link pipe please, would be very grateful

Best I can do at the mo, will take a closeup for you:

[TableLeg]

Best I can do at the mo, will take a closeup for you:

 

That looks really nice.

 

:yes:

[Aerodynamix Ltd]

Or Techcraft Steve if you are looking at larger silencers , have a word with Rich W , I think he has a contact there , his old car had one on .  

[Kit Car Electronics and Essex AO]

Some more photos of mine- actually just measured it at 7 x 31.5" with a 2.25" pipe.

[Terryathome]

Bigger it better LOL

 

Sorry, couldn't resist

 

[dhutch]

.... has internal spinners in the inner tube

Interesting.

[lewis]

I'm getting a 6.5" carbon silencer from Westfield for my MX-5 build.