who has got pictures and/or bosch id numbers of the correct 1965 horns (2-tone) for me?
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who has got pictures and/or bosch id numbers of the correct 1965 horns (2-tone) for me?
I hope you'll forgive me if I don't remove the horns from my car for photography. The data plates on them aren't very readable, either.
But, I can point out that there were two different sets of horns in 1965:
901.635.102.00 HORN LOW-PITCHED- BOSCH 390 HZ -ONLY BY SETS WITH 901.635.112.00
901.635.112.00 HORN HIGH-PITCHED- BOSCH 520 HZ -F >> 030 1224
901.635.102.01 HORN LOW -PITCHED- BOSCH 290 HZ -ONLY BY SETS WITH 901.635.112.01
901.635.112.01 HORN HIGH-PITCHED- BOSCH 345 HZ -F 030 1225 >> 030 5100
The horns in my car don't look dramatically different from these reproductions at Sierra Madre Collection. But, those reproductions do NOT have the correct frequencies for either early or late 65-66 Porsche 911s.
Well it is an old thread which doesn't really answer the question and searching doesn't seem to find any other reference. There is some relevant info in the link in post 3.
The info provided in PET which is mentioned above is not very helpful aside from providing the tone and has no reference to anything you will actually find on the horn.
There is a great resource on at http://www.bosch-classic.com
If you do an initial search it will tell you that we should have:
0 321 023 002
0 321 023 003
I'm not sure these even exist as I've struggled to find an image with 0 321 type anywhere.
If you however dig deep into the site you discover that they superseded numbers several times over the years so horns with the correct tone could have several part numbers - the only thing being different may be the screw on plate with the number on it. It is possible to follow the trail forward or back to cross reference the changes.
I had one horn still on 301022.
It had the number:
HO/FSA/12/27 ( The original Bosch numbering from 356 era horns/parts) The date code 409 - 9th month of 64 so viable to be original to the car.
This superseded by 0 320 202 020 and then by 0 320 213 01. They are all 520hz.
Attachment 476891
I was then able to identify that its mate should be:
HO/FSA/12/15
This superseded by 0 320 213 005 and then 0 320 202 007 and then 0 320 213 010. They are all 390hz. This tone also used on VW
Date code 502 - Feb 65:
Attachment 476890
Note on the back casing the only stamping - HO A 1509? Generic on this era:
Attachment 476892
For reference from 1972 - can have chrome or black grill at a glance the same:
Attachment 476893
Note however the stampings on the back (still better than repro):
Attachment 476894
FWIW the pressings are the same - with a some effort you can swap coils from 1972 to 1964 ( buy a cheap NOS 24v version and fit your internals). For those that it matters there is a change in the screw heads from 65 to 72 - the later ones being more rounded.
(I'm restoring the original and transferring NOS correct tone internals into a matching donor early housing)
Very informative post. Huge THANK YOU.
I know the HO/FSA/12/27 was used as the “Highway” horn on the early(pre 1965) Volvo P1800's alongside 2 smaller FDG “City” horns and am led to understand that different marques had similar identification like Lancia (HO/FSA 12/25). Thus I believe 25-Lancia, 27-Volvo.
This is the configuration of Bosch Horns on the P1800
Attachment 544629Attachment 544630