Macchiman Posted November 23, 2014 Share Posted November 23, 2014 Just rejoined the club after a gap of a few years and notice that there have been some changes to the web site / forum. From what I read, it looks like the jury is still out on the new look..........Checking over my recently acquired Sigma engined Supersport, I noticed that the forward link arm is in the lower position, whereas my old 7 and the build manual have the link arm in the upper mounting position.What difference do the alternative positions make? Comfort takes precedence over ultimate handling at my age. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted November 23, 2014 Member Share Posted November 23, 2014 You do mean the two-piece Watt's linkage rather than the one-piece radius arm?The May 2012 Assembly Guide for the two-piece linkage says: "9.8.3) Link arms to chassisWith the De Dion tube in place attach the forward link arm to the upper mounting bush on the chassis using caphead bolt (fastener pack 30R011A Item 2) pass from inside the cockpit, through the link arm."Jonathan Link to comment Share on other sites More sharing options...
Macchiman Posted November 23, 2014 Author Share Posted November 23, 2014 Yes, that's the one. Mine is in the lower mounting bush. Link to comment Share on other sites More sharing options...
John Vine Posted November 23, 2014 Share Posted November 23, 2014 The latest Assembly Guide says: "On some series 3 chassis a lower fixing boss is supplied to give optimum suspension geometry when used only for race and track purposes. This setting is not recommended for road usage." The AG is a little ambiguous on this point as the comment resides in the section referring specifically to radius arms. But AFAIK the advice applies equally to Watts links.JV Link to comment Share on other sites More sharing options...
Macchiman Posted November 24, 2014 Author Share Posted November 24, 2014 That makes sense as I think my 7 started life as an Acadamy model. Looks like a job for the weekend.Thanks, Peter Link to comment Share on other sites More sharing options...
Macchiman Posted November 24, 2014 Author Share Posted November 24, 2014 That makes sense as I think my 7 started life as an Acadamy model. Looks like a job for the weekend.Thanks, Peter Link to comment Share on other sites More sharing options...
simonpa Posted November 25, 2014 Share Posted November 25, 2014 Upper for comfort, lower for handling. I've had several Watts-link'ed cars and they were always setup in the lower position.The Watts-link is for improved handling, so it is senseless to put it in the upper position - I think it will probably upset the geometry if anything, due to the way it works. If you want best comfort - let me know - I'll buy you a pair of brand new radius arms and swap them for your Watts-link kit :) Link to comment Share on other sites More sharing options...
simonpa Posted November 25, 2014 Share Posted November 25, 2014 Upper for comfort, lower for handling. I've had several Watts-link'ed cars and they were always setup in the lower position.The Watts-link is for improved handling, so it is senseless to put it in the upper position - I think it will probably upset the geometry if anything, due to the way it works. If you want best comfort - let me know - I'll buy you a pair of brand new radius arms and swap them for your Watts-link kit :) Link to comment Share on other sites More sharing options...
mic Posted November 26, 2014 Share Posted November 26, 2014 You should use the UPPER mounting point for Watts linkage. It is designed for that mounting point. Link to comment Share on other sites More sharing options...
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