Please please please someone confirm the length that trailing arms should be on a book chassis.

Thanks,

Pat...

Hi Pat
the figure of 300 mm springs to mind . my experiance is that the use of 2mm wall thickness 25 x 25 rhs is an easy way to ensure that they are straight and square as per the picture in the racing section of the book .

12" (305mm) between centres but a more than few builders have made them a bit longer up 13" (330mm).

2 or 2.5 thickness 25x25 rhs is the best way to go.

If you go to the scrap yard and search out Nissan Bluebirds. On the back suspension they have adjustable arms.

You will need two cars for a full set but when cleaned up they are brilliant. Gives you some adjustment if you want to lazer check your setup for absolute straightness at the end.

Originally found by Mark Allinson a great tip.

They have an adjuster with locking nuts on them, the insert threaded part having one left hand thread and one right so that you can adjust in "situ" Well worth searching out and they are absolutely bang on for length and bushes.

quote:

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Originally posted by VinceGledhill
If you go to the scrap yard and search out Nissan Bluebirds. On the back suspension they have adjustable arms.

You will need two cars for a full set but when cleaned up they are brilliant. Gives you some adjustment if you want to lazer check your setup for absolute straightness at the end.

Originally found by Mark Allinson a great tip.

They have an adjuster with locking nuts on them, the insert threaded part having one left hand thread and one right so that you can adjust in "situ" Well worth searching out and they are absolutely bang on for length and bushes.

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There are only 2 adjustable ones per car, you need 1 non adjustable one as a datum for the axle and 3 adj to complete the set, the 4th adj one is extended into an adjustable panhard rod. They are 14mm bushes so you need BIG bolts and a big drill.

They give a fantastic ride and great handling
Rescued attachment BluebirdTrailingArms.jpg