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6" or 7" silencer


Steve M

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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 ?

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The bigger the better as Size does count!!!

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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!

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

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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.

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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

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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

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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:IMG_20140709_201411293_zpsc87dbcdd.jpg

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Best I can do at the mo, will take a closeup for you:IMG_20140709_201411293_zpsc87dbcdd.jpg

 

That looks really nice.

 

:yes: :yes: :yes:

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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 .  

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

IMG_20141029_180742287_zpscfraqelg.jpgIMG_20141029_180755590_zpsbq0utix1.jpgIMG_20141029_180804810_zps5doytfjo.jpg

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.... has internal spinners in the inner tube

Interesting.
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