Luegonigel Posted June 10, 2013 Share Posted June 10, 2013 Hi, what has everyone got as a clearance under the sump of their Sigma SV? Mine is 55 mm but my old K series was 70mm. In addition what heights have people got under the chassis in front of the rear wheel arch and also at a defined point at the front of the car? I assume height adjustment is just on the adjustable platforms on the Bilsteins? Link to comment Share on other sites More sharing options...
Stationary M25 Traveller Posted June 10, 2013 Share Posted June 10, 2013 That is way too low ... and explains the broken engine mounts !! See recent thread on this subject. You want at least 75mm ..... I know of one Sigma with over 100mm under the sump ! Yes .... collars on platforms. Get the front height to achieve the sump clearance you want, then measure under chassis rails at a point in line with rear face of front tyre. You want around 15mm higher at the rear measured at the front of the rear wing. All of this must be done with the equivalent of your weight in the drivers seat. Edited by - Stationary M25 Traveller on 10 Jun 2013 07:30:29 Link to comment Share on other sites More sharing options...
Martin J Posted June 10, 2013 Share Posted June 10, 2013 I know of one Sigma with over 100mm under the sump ! 😳 😳 Link to comment Share on other sites More sharing options...
Eugene Posted June 10, 2013 Share Posted June 10, 2013 As has been mentioned a couple of times, as a rule of thumb the front lower wishbones should basically be parallel to the ground... Too much deviation from this will cause handling issues. If the sump clearance is low with this set-up, there is a problem elsewhere. How close to the bonnet is the top of the engine for example? Can the engine mounts be packed higher, if there is space below the engine? Link to comment Share on other sites More sharing options...
KRL Posted June 10, 2013 Share Posted June 10, 2013 Hi, I recently had my Sigma Flat Floored and now have 76mm sump clearance without the driver sat in. Before the flat floor session I had 99mm sump clearance without the driver! I don't think you should aim for parallel wishbones with the Sigma unless you want it sitting very high. With 99mm sump clearance my wishbones were parallel and obviously now they are not. Link to comment Share on other sites More sharing options...
Eugene Posted June 10, 2013 Share Posted June 10, 2013 Flat flooring should set corner weights. Altering the front ride height will change the front roll centre, which is really a separate adjustment not associated with a flat floor setup. See: here for some info I wrote years back... If the front is set too low you will basically get more over-steer. The rule of thumb for a seven still stands - parallel front lower wishbones 😬 Link to comment Share on other sites More sharing options...
Steve Cornford Posted June 10, 2013 Share Posted June 10, 2013 Hi Nigel Just measured my Sigma, albeit on a paved driveway! Without me in the car (obviously) sump clearance 100mm At the rear, under the bolt attaching a-frame 160mm At the front, under the rear wishbone arm 140mm Hope this helps Steve Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted June 10, 2013 Member Share Posted June 10, 2013 Is there an approach that lets you choose the ground clearance for road use AND set it up for corner loading AND end up with the wishbones at a desired angle? Or is that too many constraints and people are consequently choosing different compromises? Thanks Jonathan Link to comment Share on other sites More sharing options...
Steve Cornford Posted June 13, 2013 Share Posted June 13, 2013 Hi Nigel Latest measurements:- Front of engine sump clearance nearside 100mm offside 90mm Front wishbone rear arm chassis bolt location point, clearance 140mm both sides. So there is a 10mm difference across the sump, either engine tilts or the sump is asymmetrical (or both ) Hi Jonathan Unless I am mistaken, the combination of wheel & tire size also has an effect on the geometry. My car has 185/60 r14. If I changed these for either larger or smaller (without changing anything else), it would either increase or decrease the ground clearances would it not 🤔 What size wheels & tyres do you have Nigel? Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted June 13, 2013 Member Share Posted June 13, 2013 Yes, my guess was that you have to treat tyre diameter as a variable if you want to satisfy all the other constraints... Jonathan Link to comment Share on other sites More sharing options...
Guest Posted July 11, 2014 Share Posted July 11, 2014 Hi All just been out in my sigma and caught a pair of cat eyes on the front end of my sump. Caterham dont have any sumps in stock:( does anyone have or know anyone who might have spare sigma wet sump if they have converted to a dry sump? Cheers Chris Link to comment Share on other sites More sharing options...
ChrisC Posted July 11, 2014 Share Posted July 11, 2014 Have you tried calling Caterham Parts for an ETA, the website can be a little out of date? Link to comment Share on other sites More sharing options...
Guest Posted July 11, 2014 Share Posted July 11, 2014 Yes tried caterham they said the 8th August before they have new stock:( Link to comment Share on other sites More sharing options...
DJ. Posted July 11, 2014 Share Posted July 11, 2014 It it possible to get it welded as a temporary fix? Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted July 11, 2014 Member Share Posted July 11, 2014 Quoting ChrisN: Hi All just been out in my sigma and caught a pair of cat eyes on the front end of my sump.What's your clearance? Jonathan Link to comment Share on other sites More sharing options...
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