I want to level up my bus by 35 mm by turning the rear torsion bars. I have 52 outer and 48 inner splines, but all the charts I can find are for beetles with different numbers of splines. Even Fletcher Gillet's book seems to give beetle specs. I can do the maths for resetting the spring plate angle and I guess I can translate angle into height raise, but before I embark on the trigonometry, I suspect this information must already be out there. Anybody?
Inner spline 360 / 48 =7.5 degrees per step Outer spline 360 / 52 = 6.92 degrees ( 6 and 12/13 ) So if you turn the bar one inner spline clockwise and spring plate one outer spline anticlockwise, The effect is 7.5 - 6.92 = 0.576 ( 15/26 ) degrees clockwise on the spring plate. So take your angle and divide by 0.576 and that tells you how many splines you need to step by on both inner and outer to change the angle. 35 mm in about 45 cm is about 4.44 degrees (arctan 35/450 ) or closest is 8 steps clockwise.
On a Kombi, set your zero on the top of the chassis rail with an inclinometer (or your iPhone). Set the top of the spring plate (pushing it up firmly with your hand to take out any slop - shouldn’t be any) to about 21* dangle, using inner and outer splines. Then jack them up onto the stops. Should set the right preload and height.
Now you've got me bothered. I'd assumed you could rotate the two ends by different numbers of splines in a plus or minus direction. Many thanks
You can but the effect is still stepping by multiples of the difference between the two spline pitches. Like this.. just put this together on my phone. https://docs.google.com/spreadsheet...SwPq2WrNjEwCcPCSjSzB1LaR-_Q/edit?usp=drivesdk
I'm really impressed you can do that on your phone. My fingers would definitely get in the way. So looking at the chart, the nearest angle to what I want is 4.62 degrees which is +5/-4 outer to inner splines on the right hand side and -5/+4 on the left. Many thanks
