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Bump stop mod

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bump mod stop
3K views 14 replies 6 participants last post by  Matt GTV 
#1 · (Edited)
Problem:Rear bump stops detaching. I've lost both twice.

Weak bump stops can detach over undulating roads/potholes etc when they make contact with the spring pan. The bump stop effectively limits the travel of the wheel to stop the tyre from hitting the arch liner. The turret itself can become corroded so the bump stop cannot be held in place any longer or the actual bump stop can perish, the weakest point is the thinnest part where it fits into the turret.

Solution: I've fitted a different type of stop. It is made from rubber and dimensions are similar (see below). The main difference is that it has a stud manufactured into the stop which locates into the turret and is then locked into place by a nut. Simple stuff.

The V6 bump stops (yellow) and turret measure about 150mm. The twinny stops are black/metal and measure about 130mm incl the turret. The twinny stops are stronger, some people fit these instead of the V6 stops. My combination measures 135mm (see photos - one is from Clive).

Another way to keep the rear bump stops healthy - ensure the drain holes in the turret are kept clear to allow trapped water to escape.
 
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#9 ·
They look good but you would just need to make sure the length is correct and the stud is long enough to protrude through the turret. Turrets are 9cm, so the rubber needs to be a min of 4cm to equate to the TS stops (total 13cm). They could be a max of 6 cm to equate to the V6 stops (total 15cm). The stud only needs to be a few cm which I centred in the turret with a small spacer.
 
#8 ·
#13 ·
I got original Alfa bump stops from Alfisti in Germany (the bill says Squadra Sportiva). The web site's in English, and it was just over £30 for a pair including delivery. Took about 4 or 5 days to arrive. I got new turrets from Alfaholics. I'm going to use some of the corrosion inhibitor spray with waxoyl to try to stop the turrets from rusting.
 
#15 · (Edited)
I'm going to use some of the corrosion inhibitor spray with waxoyl to try to stop the turrets from rusting.
Good idea, i'll be trying to keep the drain holes clear as well - see photo.

BTW - anyone know what the semi-circular cut out is on the turret rim (at bottom of photo) - some sort of alignment mark?
 
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