edmandsd Posted June 14, 2007 Share Posted June 14, 2007 If anyone's interested i've just had one made using the ends of the standard one with a quick release steering wheel boss. Had the option of tubular titanium or chromoly and chose the latter as it's better vfm and still saved over 50% of the weight of the original. I've also changed my bellmouths from steel to ali and the combination of the two offsets the weight of the air shifter i've just fitted. This is the philosophy I apply i.e. Any weight that's added must be removed from somewhere else. Home of BDR700 Edited by - edmandsd on 14 Jun 2007 03:20:55 Link to comment Share on other sites More sharing options...
tiddy1 Posted June 14, 2007 Share Posted June 14, 2007 Didn't Senna Have a light weight steering column Link to comment Share on other sites More sharing options...
scooter Posted June 14, 2007 Share Posted June 14, 2007 Are you hinting at something Mr Tiddy? Link to comment Share on other sites More sharing options...
Irrelevant Posted June 14, 2007 Share Posted June 14, 2007 I'm sure a lightweight steering column, even if weaker than a standard one, will be fine for driving in straight lines with front wheels off a pram Link to comment Share on other sites More sharing options...
Peter Carmichael Posted June 14, 2007 Share Posted June 14, 2007 A solid bar is a ridiculous design for transmitting torque. A thick walled tubular design is sensible and appropriate. Not sure I'd have chosen chromoly because of its brittle failure mode. Any opportunity to increase the diameter of the column would be a good idea, with thinner tube walls, bounded by the propensity for buckling failure with a hefty safety margin. Link to comment Share on other sites More sharing options...
tiddy1 Posted June 14, 2007 Share Posted June 14, 2007 No just being provocative, I agree with Peter, a solid rod is no stronger than a tube for transmission of torque, hence why people gun drill drive shafts, the middle bit really ddoes nothing for the strength Simon Link to comment Share on other sites More sharing options...
RiF Posted June 14, 2007 Share Posted June 14, 2007 I am just looking at having some made so would be very interested in quantity prices with quick release. I am just at quote stage. If lighter then that is a plus. RiF Flying even faster in my very bright yellow 226bhp Duratec 7, with internal kevlar/carbon panels and pushrod suspension 😬 😬 😬.for pictures of 7 and carbon Link to comment Share on other sites More sharing options...
edmandsd Posted June 14, 2007 Author Share Posted June 14, 2007 I should have stated that the tube is the diameter of the thicker top section all the way down. Home of BDR700 Link to comment Share on other sites More sharing options...
edmandsd Posted June 14, 2007 Author Share Posted June 14, 2007 Richard - give Andy Robinson a ring on +44 (0)1256 880589 and tell him i put you in contact with him. He primarily builds drag cars but has JJ Lehto and Steve Soper's McLaren F1LM down there currently and supports Adrian Newey's race car collection so i think he knows what he's doing ! His website is www.robinson-race-cars.co.uk Home of BDR700 Edited by - edmandsd on 14 Jun 2007 23:39:23 Link to comment Share on other sites More sharing options...
Peter Carmichael Posted June 14, 2007 Share Posted June 14, 2007 If it is that size all the way down, it won't fit past the dry sumped k-series engine mount. Link to comment Share on other sites More sharing options...
Jason Plato Posted June 15, 2007 Share Posted June 15, 2007 solid carbon fibre would do the job perfectly maybe a modified fishing rod here is C7 TOP Taffia Area Rep Link to comment Share on other sites More sharing options...
edmandsd Posted June 15, 2007 Author Share Posted June 15, 2007 I have a similar problem with my oil pump clearance and have simply tapered the last 18 inches down to the original diameter to enure that it clears. Home of BDR700 Link to comment Share on other sites More sharing options...
Irrelevant Posted June 15, 2007 Share Posted June 15, 2007 Is it still telescopic so it will collapse in a shunt - chromoly isn't going to bend easily afterall. Link to comment Share on other sites More sharing options...
RiF Posted June 15, 2007 Share Posted June 15, 2007 Thanks Dave, will do. RiF Flying even faster in my very bright yellow 226bhp Duratec 7, with internal kevlar/carbon panels and pushrod suspension 😬 😬 😬.for pictures of 7 and carbon Link to comment Share on other sites More sharing options...
edmandsd Posted June 15, 2007 Author Share Posted June 15, 2007 Adam - No but the telescopic movement is very limited in any event. Is this an SVA fail as i'm converting the car for road use ? In fact looking at it in the event of a shunt i'm pretty sure the top section would move in line with the bottom anyway as it's only supported in the dash by a couple of plastic bushes compared to the clamp between the top and bottom sections. Home of BDR700 Edited by - edmandsd on 15 Jun 2007 18:38:23 Link to comment Share on other sites More sharing options...
elie boone Posted June 16, 2007 Share Posted June 16, 2007 I have a 1969 kit car witch has a 16x1mm steering bar it looks like those old tubes for electicty witch where used in houses. I works fine it does'nt twist on flattened tyres. I have to add that it's rear engined so has much less wheight over the front wheels. The chassis is so flimsy that the saftey of that steering bar is no issue. As long no one can see a weld on the tube u will be fine for the SVA but strictly i think it would fail because of the welds. Link to comment Share on other sites More sharing options...
Peter Carmichael Posted June 16, 2007 Share Posted June 16, 2007 The boss is welded on anyway 🤔 I certainly think you need seamless tube... but I think Dave is talking about something a bit more sophisticated. Link to comment Share on other sites More sharing options...
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