road race engine...

70 Buster 340 said

How do longer torsion bars increase front end travel ?

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It's actually how you should mod the T-bars if you WANT a large travel range AND a suitable spring rate (or wheel rate). If you want to get the spring rate to the range where it is good for rally (which is considerably softer than for road racing) then the shorter T-bars have to be smaller diameter. When you put a lot of travel on those, then they twist too much; the strain in the material gets beyond acceptable limits and you push towards deformation. The longer T-bars proportionally reduce the twist rate and strain.

And I realize there is another part to that question, which is probably confusing the issue.... How do you then mod the suspension to actual longer travel once the T-bars work OK....I have not gotten that far to look to see what has to change around the A arms, stops, shock mounts, etc. But basically the setup is decent for this use. Unlike the rear.....