Post by goldwing-ghia on Jun 21, 2020 11:54:19 GMT -5
I am building a reverse trike with a 1982 Goldwing and a 1970"s vw beetle front torsion bar suspension. It's all coming out fine except the steering is twichy at any speed over 15mph. When I built it, I squared up the bike on my bench and ran a center line front to back and set the front end to that so I know everything is square. I lightened the suspension by removing the smaller leafs to compensate for the lighter front end and the spring rate is comfortable. Everything has been rebuilt in the front end so all is tight.
As far as alignment goes, I lined up the front rims parallel to the rear wheel as my research indicated. I am running about 4 degrees of castor, 0 degrees camber and 1/4" overall toe in over 24". I also installed a 3/4" sway bar which makes the front end stiffer side to side so it doesn't lean very much. I am running my tires at 20 lbs, down from the 30 or so when I had them mounted. I have readjusted this front end many times but can't reduce the slight side to side wander instability to a comfortable point. I am at wits end on this. Any ideas are appreciated.
Post by davej98002 on Jun 21, 2020 15:01:58 GMT -5
Hi BOB, welcome to the forum.
I think you have the alignment sorted. But what are your tie rod ends angles. Did you relocate the steering box or replace it with a Rack&pinion? The VW has a slow steering box in the 22:1 ratios. A lot of aftermarket Rack & Pinions are 12:1 and are too quick. It also has very steep angles in the Tie rod arms.
The VW is basically a center pivot steering box like a go cart. Both tie rod shafts angle back from that common center. A lot of Kit car builders used Rack & Pinions that are wider and less angle and then complain about the CRAPPY steering of VW beams.
Look at the setups of the Formula V cars.
Last Edit: Jun 21, 2020 15:02:20 GMT -5 by davej98002
US ARMY Retired. Signal Corps Retired GTE Phone Repair Tech Riding Motorcycles since 1970