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Exhaust springs

 
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riddon(at)sent.com
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PostPosted: Tue Apr 18, 2017 10:11 am    Post subject: Exhaust springs Reply with quote
I recall that there was some discussion a while ago about exhaust springs. I have just replaced my silencer but the springs seem rather loose. In fact some of them are just rattling about and not in tension at all once installed. I also have evidence of exhaust gas blowing on one of my carb bowls. Do they loose their ‘spring’ over time? Been 10 years since they were installed new / 750 hrs.

Richard Iddon

G-RIXS

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dpark748(at)icloud.com
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PostPosted: Tue Apr 18, 2017 10:48 am    Post subject: Exhaust springs Reply with quote
I had a problem with exhaust spring breaking. The originals were easy to fit but started breaking.
The replacements i received were 90mm springs which needed far too much tension to install.
When i questioned this with CKT?
It seems they changed something and my installation requires 95mm springs which they provide.
Perhaps doesn't help you but shows that you need springs that fit your installation.
Dave G-LDVO
Quote:
On 18 Apr 2017, at 19:10, Richard Iddon <riddon(at)sent.com> wrote:



I recall that there was some discussion a while ago about exhaust springs. I have just replaced my silencer but the springs seem rather loose. In fact some of them are just rattling about and not in tension at all once installed. I also have evidence of exhaust gas blowing on one of my carb bowls. Do they loose their ‘spring’ over time? Been 10 years since they were installed new / 750 hrs.

Richard Iddon

G-RIXS





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JonathanMilbank



Joined: 14 Apr 2012
Posts: 391
Location: Aberdeen area
PostPosted: Wed Apr 19, 2017 1:06 am    Post subject: Re: Exhaust springs Reply with quote
Along with my new Nev Eyre cowls, I was obliged to buy a new CKT silencer. It seems like a first class piece of engineering and a friend who has one never had any trouble with his. But after less than 10 hours since installation mine broke a spring. This is not uncommon for various designs of silencer and Chris Piper of CKT does his best to obviate this problem, by sourcing springs from different suppliers and being insistent that no metal tools should ever be employed for installation or removal of springs.

Heide of CKT sent me a replacement and spare under warranty, which arrived the next day. Since then I've frequently been using a telescopic mirror to monitor the springs after each flight. My intention for next time that I remove the cowls is to apply a thick bead of silicone along the length of each spring, as an attempt to damp vibrations. Any suggestions as to which kind of silicone I should obtain in the UK?

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graeme bird



Joined: 15 Jul 2010
Posts: 434
PostPosted: Wed Apr 19, 2017 11:49 am    Post subject: Re: Exhaust springs Reply with quote
When I ordered new springs a while back they sent me the wrong size by mistake; too short if I recall.
Some wise person told me to put locking wire through them and a bead of ordinary silicone - they seem to have been stable for a while now.

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