DDK - Die Deutschen Klassiker

wildtexas wrote: ↑Wed Jun 16, 2021 9:27 pm I believe so. IIRC the long wheel base have different diameter mounting bolts at the bottom. 68 can be weird as it's the one year only thing. I ended up with the koni classic red shocks. Firmer than the 50 year old original boge units, but a very positive feel in road holding.

Matt

AndrewSlater wrote: ↑Tue Oct 12, 2021 2:47 pm One of the other tasks I undertook whilst awaiting fuel was investigating my shock absorber setup.
I'd watched a video of someone installing Koni Classic shocks to his '67 911 and was surprised when he claimed they were supplied with the incorrect bump stops for the SWB cars. Apparently the rears are supplied with an 9 bump stack but that SWB cars should only have 8 fitted, the later LWB cars take 8.

This made me wonder whether my Koni Classics were correctly installed.
I'd always felt that if I hit a pot hole or speed bump the car would jolt more than I would expect - maybe this could be the reason.

Another thing I had read was that the shocks aren't always supplied with the rebound setting the same.
Must admit, I'd never checked the number of bump stops or how the rebound was set, I'd just fit them as supplied .

So whilst the carbs were off the and the rear suspension readily accessible I dropped one of the rear shocks.
Bump stops = 9 - bugger!
Rebound setting checked - fully soft - that's good.

Quite a bit of the bump stop rubber had found its way onto the piston of the insert so I am guessing I had hit the bump stop on quite a few occasions.
I find it quite annoy that a set of shocks bought specifically for a SWB car were supplied with no notes suggestion that they need to be modified.



So I hack sawed off a bump stop, and then repeated on the other side.

Now as I have also lowered my car an inch or so from standard height I expect that I had even less play on my bump stops.

Deciding that this was a good find, I decided to check the front rebound setting and bump stop scenario.
At the fronts the standard bump stop was fitted along with the extra one Koni supply.
Now some people suggest removing the extra one when a car is lowered and as its approximately the same height as the extent to which I had lowered the car - I decided to remove that also. Again there was quite a bit of bump stop rubber on the piston of the strut so I suspect it had been hitting quite often.

I also felt that possibly the rebound on the fronts was a little on the low side, so decided to dial in 25% on the fronts.

Needless to say as part of the drive around checking the AFRs the ride seemed a lot more compliant than previously, and when I hit a pothole or two it no longer jolts. Seems a good improvement.

Morale of story: if you are fitting Koni Classics count your bump stops!