MRG1965 Posted July 29, 2014 Report Share Posted July 29, 2014 Hi all, was out last weekend and had cause to run at high speed (70mph honest officer ) along the motorway for a few hours. I noticed that the mohair hood vibrates against the front and middle roof support bars. Road atlas stuffed between roof and middle bar took the noise down to a level where I could hear my own thoughts again, but clearly a solution needs to be found and I'm sure has been found many times over the years. Reading other threads going back a few years I can see this is a standard design feature and usually only noticed by southern softies (like myself) who don't have all the Biggles gear and want to put the roof up. I can see some type of felt tape or foam inserts (or an inner roof lining, but that just seem overkill) are required around/between the roof bars and the roof to stop the vibration on the bars, if I'm to have my wife in the car with the roof up. So given the level of knowledge and ingenuity out there I though I'd ask if anybody has had any success with this problem before I begin trying various solutions. The roof and bars are all in excellent conditions and the roof is tight as a drum and in all respects looks exactly as it should with no obvious defects or fault that are causing this to be any worse than as Triumph intended. Mark Quote Link to post Share on other sites
RogerH Posted July 29, 2014 Report Share Posted July 29, 2014 Hi Mark, is it a convertible roof or surrey top? Roger Quote Link to post Share on other sites
MRG1965 Posted July 29, 2014 Author Report Share Posted July 29, 2014 Hi Roger, a convertible. Mark Quote Link to post Share on other sites
TR 2100 Posted July 29, 2014 Report Share Posted July 29, 2014 The vibration always was, and always will be, a problem. The factory fitted (well, glued) a strip of felt-like material to the middle bar. I'm sure that idea could be copied (and improved) easily (in case you need your maps!). Also, on the factory hoods, there was an extra flap sewn into the hood, with press studs. The flap wrapped around the middle support, almost the full width of the hood, and held the hood to the frame. A combination of those two solutions should allow you to hear your passenger screaming. AlanR Quote Link to post Share on other sites
TR NIALL Posted July 29, 2014 Report Share Posted July 29, 2014 Try some 1/2" Copper Pipe Insulation. Quote Link to post Share on other sites
graeme Posted July 30, 2014 Report Share Posted July 30, 2014 (edited) The vibration always was, and always will be, a problem. Also, on the factory hoods, there was an extra flap sewn into the hood, with press studs. The flap wrapped around the middle support, almost the full width of the hood, and held the hood to the frame. AlanR I have a Skinner hood on my TR4A and it has the flap sewn in. Cheers Graeme Edited July 30, 2014 by graeme Quote Link to post Share on other sites
ctc77965o Posted July 30, 2014 Report Share Posted July 30, 2014 The early etype hoods had bags of lead shot sewn into various spots to stop the vibration (extra mass alters resonant frequency) Quote Link to post Share on other sites
MRG1965 Posted July 30, 2014 Author Report Share Posted July 30, 2014 Hi Alan, yes mine too has a piece sewn (1/2 roof width only though) in to the hood that clips around the front bar, but could have benefited from one on the middle bar too maybe when the hood was manufactured. I think the felt is the most likely option to work best and not look too out of place, as it's a bit of a problem to read the map when its above your head Niall, though if the pipe insulation and if I can find something with a relatively thin wall and softish outer this might work. Graeme, liking the garage a loooooot. Dave, yes I can see how the shot would dampen down the vibration might be something to be added to a new hood in a few years. All in all I think some extensive use of Google and visiting various outlets to see what's about that could be pressed in to service. Have to have something in place before Harrogate IWE14 in weeks time. Otherwise might be stuffing tea towels under the bars! When it comes time for a new hood (in a few years) will have to see what the options are to have extra features added. Mark Quote Link to post Share on other sites
Steve R Posted July 30, 2014 Report Share Posted July 30, 2014 (edited) Mark What about a length of velcro, the fluffy half, or would that be too thin? if so stick the hook half to the rail. you can get self adhesive velcro on a roll, maybe iron on stuff too. http://www.ebay.co.uk/itm/VELCRO-SELF-ADHESIVE-STICKY-2mtrs-x-20mm-HOOK-LOOP-B-/271374674196?pt=UK_Crafts_Sewing_Supplies_MJ&hash=item3f2f30e914 Steve Edited July 30, 2014 by Steve R Quote Link to post Share on other sites
MRG1965 Posted July 30, 2014 Author Report Share Posted July 30, 2014 HI Steve, just looking at this felt tape on ebay. Thinking it needs to be softer than Velcro as this may chafe and mark/wear the inner hood surface. Also off to a fabric warehouse at lunchtime to see what they have... Might end-up with a set of curtains for the rear window Mark http://www.ebay.co.uk/itm/ANTI-SQUEAK-ANTI-RATTLE-SELF-ADHESIVE-FELT-TAPE-25mm-x-5m-/271460699638#ht_2347wt_986 Quote Link to post Share on other sites
Steve R Posted July 30, 2014 Report Share Posted July 30, 2014 Mark I was thinking of sticking it to the hood, rather than the rail. Quote Link to post Share on other sites
MRG1965 Posted July 30, 2014 Author Report Share Posted July 30, 2014 Hi, yes was not sure if that would be pulled off as the tension was put on the roof, but I suppose it would be the same problem either way around. Was hoping not to have to stick anything to the roof lining, but might be the best way. No curtains for the back window either, a very short non standard drop apparently, so would have to have them custom made. Mark Quote Link to post Share on other sites
Steve R Posted July 30, 2014 Report Share Posted July 30, 2014 (edited) Pehaps a Roman blind then? or Swags and Tails....and a Pelmet, there's a word not used for a while.... Edited July 30, 2014 by Steve R Quote Link to post Share on other sites
bob-menhennett Posted July 30, 2014 Report Share Posted July 30, 2014 Mark I use an old tea towel ,suitably folded and wrapped around the hood frame.Do up the three poppers and job done. Bob Quote Link to post Share on other sites
ianc Posted July 30, 2014 Report Share Posted July 30, 2014 Pelmet - ah, reminds me of the Honeywell office at Brentford in the 1960s, and in particular a young, very tall & slim lass called Anne, whose skirt (?) stood a few inches above the top of Vic's desk, which excited him, a middle-aged father of 5, mightily! Not at all PC, of course. Ian Cornish Quote Link to post Share on other sites
Ashley James Posted July 30, 2014 Report Share Posted July 30, 2014 (edited) I have some 3mm wool felt sheet that a I cut a length from and wrap around the front pipe of my TR3A hood. It stops that infuriating crackling noise until I go a bit fast then the hood lifts of completely and it falls on my head. This was disconcerting, so I used small cable ties to hold it, which was successful until I folded the hood down with the wife's help. Now the felt is down behind the passenger seat and all the cable ties are at the end somewhere. When she's in the car with the hood up, she can hold it to stop the noise, but she's arguing that it's noisy and comfortable and that she'd prefer we went in something else, so I'm having to rethink. Edited July 31, 2014 by Ashley James Quote Link to post Share on other sites
pfenlon Posted July 30, 2014 Report Share Posted July 30, 2014 Nials on the money, but use thicker stuff. Quote Link to post Share on other sites
boxofbits Posted July 31, 2014 Report Share Posted July 31, 2014 Hi Mark Do you drive with the windows right up ( I'm assuming a Southern Softie would do). You could TRy adjusting the window position a little as this can level the air pressure a bit and prevent the flapping of the hood. Other than that it just typical TR, as my own is not exactly quiet s a whole. And if it has the added effect if drowning out 'her inside', then .......what the heck. Regards Quote Link to post Share on other sites
stuart Posted July 31, 2014 Report Share Posted July 31, 2014 Strips of the furry part of Velcro glued to the top of the rails does help as does the sewn in tubes across the hood that go over the rails with the poppers, these need to be a tight fit or they will contribute to the noise. The heavier weight of material for the hood then the quieter they are, Its only when you get to very expensive cars with a headlining under the hood frame that you start to get a quieter ride Im afraid. Stuart. Quote Link to post Share on other sites
MRG1965 Posted July 31, 2014 Author Report Share Posted July 31, 2014 Thanks for all the comments and advice. I'm planning to have a play this weekend and I'll let you know how it goes or not as the case maybe. Mark Quote Link to post Share on other sites
MRG1965 Posted August 3, 2014 Author Report Share Posted August 3, 2014 Hi all, just a quick update. added the sticky backed felt to the front and middle bars. What a difference, noise reduction is massive from the hood slapping on the bars. But as always remove one thing and you can hear the next. The hood drums naturally as the speed increases, but given the noise reduction is about 70% my ears won't be bleeded after 3 hours on the M1 up to Harrogate on Thursday for the IWE. Mark Quote Link to post Share on other sites
Paul Harvey Posted August 4, 2014 Report Share Posted August 4, 2014 (edited) Make sure you do the whole job properly Edited August 4, 2014 by Paul Harvey Quote Link to post Share on other sites
MRG1965 Posted August 4, 2014 Author Report Share Posted August 4, 2014 HI Paul, yes, next step is sound insulation under carpets and looking in to sticking some sort of inner hood lining to try to modify the flappy properties of the hood between the roof supports. But at least I can now hear the engine. Mark Quote Link to post Share on other sites
AlanT Posted August 5, 2014 Report Share Posted August 5, 2014 I have a big roll of felt. PM to me if interested. Quote Link to post Share on other sites
MRG1965 Posted August 5, 2014 Author Report Share Posted August 5, 2014 Hi Alan, thanks for the offer, I'll keep it mind once I've decided which way to go. Mark Quote Link to post Share on other sites
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