Rosco's haynes Build

[Tatey]

Ross you want the input and output flange to be as close to parallel as you can to prevent any vibration. When setting the height/offset of the engine you just need to make sure you don't go above 7 deg on each universal joint otherwise you run the risk of shortening the lifespan of the bearings. The smaller the angle the better though.

It's not the be all and end all if they aren't parallel/coaxial and you end up running different angles on both UJ's, it will just introduce more vibration into the system which essentially being a race car you won't really notice. If you were designing a tin top designed to cruise along the motorway at high speed you really don't want to feel that vibration.

If you have a look at the shaft drive Triumphs you will see that only has 1 UJ meaning there isn't a second UJ to cancel out the speed variation and therefore the vibration in the system. And the rear wheel pivots the angle of the joint changes meaning the vibration in the system increases. So don't get too hung up on trying to get it spot on.