Tony Martyr Posted September 24, 2001 Share Posted September 24, 2001 Some months ago I fitted a 4:1 exhaust header plus 6 inch sealed silencer all from Caterham. I have got a rattle that I think is coming from the silencer that is driving me seriously demented. It is not the protection cover-that has been removed. I can not get anything to rattle while stationary and even taking the silencer off and shaking it produces no noise other than me grunting. The noise comes at certain engine rpm so I think it may be a loose item in the silencer - like what - the through tube? It is getting worse or I am getting sensitised to it and I have checked everything else under the car on the passenger side to no effect - any sensible suggestions or previous experience? Link to comment Share on other sites More sharing options...
ECR Posted September 24, 2001 Share Posted September 24, 2001 Try a large jubilee clip around the four pipes where they enter the collector. It worked for me. Link to comment Share on other sites More sharing options...
NeilH Posted September 24, 2001 Share Posted September 24, 2001 Also you could try the large plug in the downpipe from the manifold, mine came loose and rattled until it fell out at which point the noise was a whole lot worse Rgds Neil Link to comment Share on other sites More sharing options...
Blatman Posted September 24, 2001 Share Posted September 24, 2001 If it's a K (and I've no idea what Tony's engine isblush.gif) it could be worth checking the plug cover. A few K folk on here have blamed all sorts of rattles on it. If it's not a K, then I'll wind me neck back in........wink.gif Link to comment Share on other sites More sharing options...
Rob Walker Posted September 24, 2001 Share Posted September 24, 2001 My 4:1 system rattled like a bad un. I had to shim the primaries as they enter the collector using some very thin ali ( a bit sardine tin I think ) No more rattles and the exhaust sealant now stays put. Rob. Link to comment Share on other sites More sharing options...
Sid Spalding Posted September 25, 2001 Share Posted September 25, 2001 I've got the same rattle - it's coming from the primaries joining the collector.It tends to go away when warm - probably things expanding. I've seen a jubilee clip used as a cure. I use silicon sealant but it blows out after a while. Does anyone know of something that can be used that doesn't show, is flexible and doesn't blow out ? cheers Sid W77 CAT Link to comment Share on other sites More sharing options...
Tony Martyr Posted September 30, 2001 Author Share Posted September 30, 2001 End of thread feed-back. The problem was just as Sid, Rob and all suggested. It was one or more of the primary tubes vibrating in the collector. This seemed unlikely from an exteranl inspection as everything was pretty gas tight and it was not cured by holding them together with a large clip. I re-made all of the joints with liberal amounts of heat-gum sealant and took the car out for a short run to cure it. The resonance can still be detected as the engine goes through a certain rev band but the horrible noise is completely disappeared. Thanks Guys Link to comment Share on other sites More sharing options...
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