09-19-2017, 11:30 PM
Mel,
Castor is a relative dimension. The higher the castor, the more the frame flex's. A good number for a old style frame is 9 degrees. 0 castor axles tend to make a kart handle like a wagon. Castor gives the steering (trail), where the spindle shaft pivot is in front of the wheel center at the ground. Where the king pin travels in an arc back down, forward up. Go Kart 800 had approximately 9 degrees of castor. However castor should also have king pin inclination, for it to really work right. All this is why a "Go Kart" would steer so much better than the same year "Bug" kart. Duffy had the front axle worked out way better than Tom at Bug.
Brian
Shamrock Race Karts
Castor is a relative dimension. The higher the castor, the more the frame flex's. A good number for a old style frame is 9 degrees. 0 castor axles tend to make a kart handle like a wagon. Castor gives the steering (trail), where the spindle shaft pivot is in front of the wheel center at the ground. Where the king pin travels in an arc back down, forward up. Go Kart 800 had approximately 9 degrees of castor. However castor should also have king pin inclination, for it to really work right. All this is why a "Go Kart" would steer so much better than the same year "Bug" kart. Duffy had the front axle worked out way better than Tom at Bug.
Brian
Shamrock Race Karts