I need help with these Koni shocks

[John Straub]

I have these Koni Shocks that are pictured on the left and I'm not sure what year the fit. The ones on the left are stamped Special "D" 80J-1738. Any idea?

The ones on the right came out of my '65 911 and are stamped
901 333.051.14 with a with a stamp on them(in the second photo), they also say B 911 on them, I have never seen this before on Koni shocks. I think they were factory installed...does that sound correct?

Also can they be rebuilt and who does it?

Thanks,
John

[preS]

John

Koni NA and 3 or 4 licensed companies rebuild them. It costs about $140 a shock.

1738 doesn't seem to be used for a classic Porsche

Richard

[Flunder]

Hi John:

The optional rear Koni shock listed on the 1965 Factory Option list is:
901.333.051.12 while yours differ only in the two digit suffix with 14 instead of 12.

I would agree that the ones on the right are the real deal. The 14 suffix may indicate some change in internal valving or bushings. They should be back on your 65.


For your ease of reference, the optional front Koni on the 1965 Factory Option list is:
901.341.067.05

Source for the above information: Porsche 911 Red Book by Patrick Paternie.

The Koni model nbr 1738 is the oem aftermarket (as opposed to factory) replacement for the rear of SWB cars.

The 1738 is shown in the 1974 Performance Products, Van Nuys, Calif. catalog as being for 911/912 1965-1968 rear ($39.50 each).
The Mitcom catalog of the same year shows the 65/68 rear application as 80K-1738. The difference between J and K is shown in another catalog and seems to indicate some detail change in the upper rubber bushings.


Hope this helps.

[John Straub]

Thanks guys...that's really helpfull. I would like to put the Koni Shocks that came with the car back on...so I'll try to have them rebuilt.

Thanks,
John

[66S]

It has been my experience that the early Konis fail because the top outer seal breaks into pieces clogging the orifices. If they will compress but not extend easily this is probably the case. You can unscrew the top assembly with a spanner wrench, clean the pieces and improvise an O ring for the top outer seal. Some Konis are simply crimped together on top and cant be disassembled. I replaced the oil with heavier viscosity motorcycle fork oil to get more dampening on compression which is not adjustable. I think Konis came with 10 wt. oil.

[preS]

John

Are there date stamps in the 901.333.051 shocks?

Richard

[John Straub]

Richard,

I put them away, I'll pull them out and take a look.

John