foster461 Posted February 5, 2017 Report Share Posted February 5, 2017 One of my winter projects is overhauling the accelerator connection and linkage for the DCOE's. I'm converting it to a top mounted cable operation to get rid of the Rube Goldberg bell crank mechanism and upgrading to a better throttle bar and linkage. One problem that I have always had with these particular DCOE's is with some flanges on the carb bodies that get in the way of the operating rods. This was a problem with my original linkage and it is made worse by the new linkage. The flange in question is circled in red, there is one on the other side too: As far as I can tell this bracket serves no purpose in my application and I can just grind them off. I do wonder though what were they meant for and do all DCOE's have them or just these later Spanish carbs ? Stan Quote Link to post Share on other sites
Guest ntc Posted February 5, 2017 Report Share Posted February 5, 2017 Stan Yep just grind them off the carbs was used for many different cars. Quote Link to post Share on other sites
Tom Fremont Posted February 5, 2017 Report Share Posted February 5, 2017 (edited) Hi Stan, Looks like alternate position for a throttle stop screw. Shame to remove it, but if you must you must. Cheers, Tom Edited February 5, 2017 by Tom Fremont Quote Link to post Share on other sites
foster461 Posted February 5, 2017 Author Report Share Posted February 5, 2017 Hi Stan, Looks like alternate position for a throttle stop screw. Shame to remove it, but if you must you must. Cheers, Tom It was in the way Tom, always has been so I followed Neil's advice and removed it. I assume you are using MISAB plates Tom, what are you using on the studs to fasten the carbs to the manifold ?. I made the mistake of using regular spring washers and nuts, flattened the o-rings in the MISAB's and have probably been running lean for the last 5 years. Stan Quote Link to post Share on other sites
Tom Fremont Posted February 6, 2017 Report Share Posted February 6, 2017 Hi Stan, I use the Thackeray ( sp?) washers supplied by the usual suspects ( Pierce Manifolds will have them ) with nyloc nuts ( stainless, of course ). The carbs should wiggle fairly easily. I'm surprised that overtightening would cause the MISABs to leak. I hope changing them out improves the running behaviour. Cheers, Tom Quote Link to post Share on other sites
peejay4A Posted February 6, 2017 Report Share Posted February 6, 2017 It's Thackery. I had no end of trouble with them breaking on my old Mk1 Cortina. Quote Link to post Share on other sites
Guest ntc Posted February 6, 2017 Report Share Posted February 6, 2017 (edited) Stan They are now soft mounts have been for years, if you do over tighten the thackery washers the o rings are shot.http://www.webcon.co.uk/ Edited February 6, 2017 by ntc Quote Link to post Share on other sites
stuart Posted February 6, 2017 Report Share Posted February 6, 2017 (edited) The modern equivalent of the Thackery washer is this http://www.burtonpower.com/carb-mounting-kit-dcoe-carbs-x-2-webcmk.html Edit .Took too long to find a link and Neil beat me too it! Stuart. Edited February 6, 2017 by stuart Quote Link to post Share on other sites
Guest ntc Posted February 6, 2017 Report Share Posted February 6, 2017 (edited) The modern equivalent of the Thackery washer is this http://www.burtonpower.com/carb-mounting-kit-dcoe-carbs-x-2-webcmk.html Edit .Took too long to find a link and Neil beat me too it! Stuart. Thats the ones and keep at least 2 mm between the washers. Edited February 6, 2017 by ntc Quote Link to post Share on other sites
stuart Posted February 6, 2017 Report Share Posted February 6, 2017 Thats the ones and keep at least 2 mm between the washers. Ah thats the other bit of info I couldnt remember.......The clearance, thanks. Stuart. Quote Link to post Share on other sites
foster461 Posted February 7, 2017 Author Report Share Posted February 7, 2017 Here's what my apparently over tightened MISAB plates look like. While I was looking for a supplier of replacement MISAB plates I noticed the softmount fasteners that Neil and Stuart have mentioned. I have used the Thackery washers in the past but I dont like them. I ordered the MISAB's and the soft mounts from fastroadcars.co uk. Never done business with them before but they were very responsive, very accommodating, had good prices and take paypal. I ordered the MISAB plates and the softmounts. Should have them in a few days. Pierce sells the same mounting hardware but at eye watering prices. For what I would pay Pierce for one carb I got the complete set for three carbs from the UK including the shipping. Thanks guys for the help. Stan Quote Link to post Share on other sites
Guest ntc Posted February 7, 2017 Report Share Posted February 7, 2017 Stan you will also have had flooding,suprised it even ran like that. Quote Link to post Share on other sites
stuart Posted February 7, 2017 Report Share Posted February 7, 2017 Fastroad cars are good suppliers, I have used them for years.http://www.fastroadcars.co.uk/store/ Stuart. Quote Link to post Share on other sites
foster461 Posted February 7, 2017 Author Report Share Posted February 7, 2017 Stan you will also have had flooding,suprised it even ran like that. Interesting that you should mention that Neil. Part of the reason that I started pulling this apart is I have always had a problem with getting the engine to idle below 1200rpm. I had attributed that to butterflies and crappy throttle linkage. I had also noticed a strong smell of gasoline sometimes when shutting off the engine. Stan Quote Link to post Share on other sites
Guest ntc Posted February 7, 2017 Report Share Posted February 7, 2017 Stan Remember I told you about the linkage years ago Weber's do not like vibration as the floats will not put up with it. Quote Link to post Share on other sites
peejay4A Posted February 7, 2017 Report Share Posted February 7, 2017 ISTR that the fuel froths and the floats can't register the correct level. Quote Link to post Share on other sites
Tom Fremont Posted February 7, 2017 Report Share Posted February 7, 2017 I've been running MISABs with Thackery washers for 80K+ miles and no issues. I also ran without soft mounts and had no issues; the principle bothered me though so I went back to soft mounts with some difficulty, as the early wheelarch cramps things where trumpets and air filters are concerned. If I ran a 4-pot I wouldn't consider running without soft mounts, though if I'm not mistaken the LOTUS Elans didn't have them. Cheers, Tom Quote Link to post Share on other sites
graeme Posted February 7, 2017 Report Share Posted February 7, 2017 If I ran a 4-pot I wouldn't consider running without soft mounts, though if I'm not mistaken the LOTUS Elans didn't have them. Cheers, Tom I had an Elan +2S back in the '70s which had Dellortos which were soft mounted and the twin cams in Escort/Cortinas also had soft mounts. Cheers Graeme Quote Link to post Share on other sites
Guest ntc Posted February 7, 2017 Report Share Posted February 7, 2017 A 5 running Weber's Quote Link to post Share on other sites
Tom Fremont Posted February 7, 2017 Report Share Posted February 7, 2017 A 5 running Weber's ...and a '250 likewise 550 rpm A US TR5 idling.MOV Quote Link to post Share on other sites
foster461 Posted February 7, 2017 Author Report Share Posted February 7, 2017 Very nice Neil. If I still cant get a decent idle after this winters linkage overhaul I will have to re-visit the idle circuit. Stan Quote Link to post Share on other sites
Guest ntc Posted February 7, 2017 Report Share Posted February 7, 2017 Stan You know where I am if I could post a video I would go to the garage and fire one up Quote Link to post Share on other sites
Tim D. Posted February 8, 2017 Report Share Posted February 8, 2017 Can also confirm that Elans have soft mounts or Thackerys.. when I had an Elan there was often long threads on the forum discussion which was best. similar to discussions on what to lubricate trunions with. In the end it was clear that not all thackery washers were created equally. if you can get some old stock unused ones these lasted for ever and were the best choice as they stay stable (the rubber soft mounts can soften with repeated heat cycles). Cheers tim Quote Link to post Share on other sites
stuart Posted February 8, 2017 Report Share Posted February 8, 2017 I have been using Thackery washers for years on my Dellorto equipped 4a and have had some break due to the main linkage plate being mounted off the lower centre two mounting studs so finally found a source of old stock ones on Ebay and they have lasted the course, I always change the Mesab plates if I remove the carbs for any reason as they are cheap and essential. It will tick over when cold straight off starting at 450 RPM which comes up to 650 when warm. Stuart. Quote Link to post Share on other sites
foster461 Posted February 22, 2017 Author Report Share Posted February 22, 2017 A couple of observations after installing the misab plates and the cup/grommet style mounting system. First, the cup/grommets need about .5 inch of free stud just to get them on the stud and then you have to get a nut on the stud. I had to fit longer studs to the manifold to accommodate all of this and there was only just room between the stud and the carb body to get a nut on. Second, even with the longer studs that are about as long as you can go there is barely enough room to get a normal nyloc on the stud. I think I will switch to regular nuts and some thread locker as I dont trust the nylocs with this little engagement on the stud. Quote Link to post Share on other sites
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