Occulomency Posted March 16, 2013 Share Posted March 16, 2013 Hi, Hoping someone can help me or tell me not to be a silly sausage. I'm new to this Caterham owning lark, having picked up a 1.8k series supersport in December. I went for a short blat between the showers this afternoon, and could hear a high pitched rasping sound coming from the exhaust , I think. But it's only there at certain revs, around 2,000-2,500 and sounds like something resonating. I've have a fiddle round the mountings and it all seems solid enough. So, do I have a trip to an exhaust specialist in my near future? Is there anything else I need to check? Thanks in advance. Fraser. Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted March 16, 2013 Leadership Team Share Posted March 16, 2013 Check the big jubilee clips that hold the heat shield in place, often the culprit. Otherwise, what exhaust is it, single pipe outside the body or a 4 branch? Is it definitely the exhaust? Stu. Link to comment Share on other sites More sharing options...
Occulomency Posted March 16, 2013 Author Share Posted March 16, 2013 It's a single pipe outside of the body. I'll check the clips when the thing cools down. Cheers. Fraser. Link to comment Share on other sites More sharing options...
keybaud Posted March 16, 2013 Share Posted March 16, 2013 Quoting Occulomency: Hi, Hoping someone can help me or tell me not to be a silly sausage. I'm new to this Caterham owning lark, having picked up a 1.8k series supersport in December. I went for a short blat between the showers this afternoon, and could hear a high pitched rasping sound coming from the exhaust , I think. But it's only there at certain revs, around 2,000-2,500 and sounds like something resonating. I've have a fiddle round the mountings and it all seems solid enough. So, do I have a trip to an exhaust specialist in my near future? Is there anything else I need to check? Thanks in advance. Fraser. It could be the thermal wadding inside the exhaust has thinned out a bit and the central pipe within the exhaust is resononating/vibrating at those revs. Link to comment Share on other sites More sharing options...
Stationary M25 Traveller Posted March 16, 2013 Share Posted March 16, 2013 Check the manifold nuts on the exhaust. Check the three bolts that hold the cam cover on top of the engine. It may be the baffles or perforated pipe coming loose. Is it a welded end on the silencer or bolt-on ? If welded, you will need someone to cut the end off and reweld it. Not your average exhaust centre. Try thumping it with your fist when cold .... can you make it rattle ? Edited by - Stationary M25 Traveller on 16 Mar 2013 17:59:09 Link to comment Share on other sites More sharing options...
Myles Posted March 16, 2013 Share Posted March 16, 2013 Well, don't thump it with your fist - rap it with your knuckles :-) The other thing I've had in the past is an air leak from the collector that gave a bit of a rattle/farty noise. Link to comment Share on other sites More sharing options...
Stationary M25 Traveller Posted March 16, 2013 Share Posted March 16, 2013 I meant palm ...... couldn't think of the word when typing earlier !! Cold up a ladder ! Link to comment Share on other sites More sharing options...
Occulomency Posted March 17, 2013 Author Share Posted March 17, 2013 The nuts and clips are all nice and tight. There is a metallic sounding rattle when I give the silencer a slap. However, I found a dozen or so bits of gravel trapped between the heat shield and the silencer. I'll take it out for a test in an hour or so and report back. Thanks for your kind advice. Fraser. Link to comment Share on other sites More sharing options...
Stationary M25 Traveller Posted March 17, 2013 Share Posted March 17, 2013 Aha .... that would squeak, rattle and buzz like a good 'un ! Edit ... a good excuse to remove the ugly guard and get polishing ! Edited by - Stationary M25 Traveller on 17 Mar 2013 10:06:26 Link to comment Share on other sites More sharing options...
Occulomency Posted March 17, 2013 Author Share Posted March 17, 2013 Yeah, it was the gravel. Back to sounding like Brian Blessed again. Happy days! Fraser. Link to comment Share on other sites More sharing options...
myothercarsa2cv Posted March 17, 2013 Share Posted March 17, 2013 Reminds me of the time we dropped a few BBs down the seat tube of a friend's bicycle. Drove him potty 😬 😬 😬 Link to comment Share on other sites More sharing options...
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