Lucas Horn mounting

I have a couple of Lucas Horns, just like these;
http://www.ebay.co.uk/itm/0RIGINAL-LUCAS-DUAL-TONE-12-VOLT-HORNS-/262260900504?hash=item3d0ff7c298:g:5acAAOSwk5FUvCP2
and I want to mount them on my headlamp bar. They are replacements for a pair that disappeared long ago, so I know it is possible. I cannot remember the details of how they were mounted, though. They are very heavy. They have a mounting bracket, which is composed of springy leaves, right at the back end. Select the second image, and then zoom in, and they are visible. The horns certainly look as though they are designed to be supported off of these brackets, and presumably there should not be anything under the body of the horn, to allow the body top to vibrate properly, and produce the very loud lovely sound that they do. The problem is, that all the weight of the horn will be cantilevered off these, and that will surely lead to premature failure of the brackets, even if I can devise some way of clamping them in place so that the weight doesn't just make them rotate forward around the headlamp bar. Does anybody know how these should be mounted? Were they originally designed to be mounted on their sides, so that the force of their weight was in a different direction, with the mounting bolts in the same vertical plane? Or should I just ignore these attached brackets, and make up a more solid support?
Any help welcome.
--
Davey.

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On 02/02/2016 19:30, Davey wrote:

The P4 Rover had horns with mountings like that. they were mounted sideways either side of and behind the radiator with two fixing bolts. The spring style mounting was simply to accommodate vibration without metal fatigue. The fixing method pulled on the top mounting hole and pushed on the bottom one.
I can't imagine the fixing lasting long if the fixing holes are horizontal rather than vertical, so if you want to mount them on a headlamp bar, you are looking for a clamp with a vertical bar to which the mounting bracket of each horn bolts with one hole above the other. Also the make and break contact will not work so well if the horn is mounted horizontal. It is not designed for that orientation.
It might look best if the one vertical mounting was central, with one horn pointing left and the other right. The alternative is two verticals with the horns pointing towards each other.
One thing you might like to think about is how weatherproof the horns are. The Rover ones were positioned under the bonnet out of the way of rain and spray. On a headlamp bar they will be at the mercy of the weather, and if they point forwards they will fill with rain as you drive on rainy days. Pointing sideways they are still at the mercy of wind-borne rain when the car is stationary. The electrics inside won't survive long before corroding. I suspect you are going to be faced with a decision of whether to have these horns as a working set out of sight, or a pretty chrome set in full view which are for decoration only.
Jim
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On Tue, 02 Feb 2016 22:40:30 +0000

Now that all makes sense, and matches one of my thinkings. Since I never had to worry about them, I never paid much attention to their mounting method.

Hmm, I see what you mean. That would be not too difficult to make up, but is not how they were originally sitting.

The original ones were horizontal, and sounded really good. When I tested these replacement ones after purchase, I sat them horizontally on my car's engine compartment bodywork near the battery, and they were LOUD, so what possibly better operating conditions might be like, I can't imagine! I think that there may be effectively no aural problem in mounting them horizontally, even if they were designed as you say, for vertical mounting.

I am thinking more of a central post, with one horn mounted on each side, or two posts a distance apart. This is in no way yet thought through, though. (Say that when drunk).

The ones that were there originally had been there for many, many years, and still worked fine. Early photos of the car from 1948 show them, and my intention is to restore the original 'face' of the car. They had a mesh in the throat, which might have acted as water protection as well as a stone guard. The mesh was much finer than those in the e-bay ad. My replacements don't have that (yet), so your point is valid.
And £225 for the pair is silly money, they go, chromed, for more like £70-£100. Those do look good, though.
Thanks for confirming the mounting setup.
This is a long-term project, so don't expect any updates soon. I'm gathering information before deciding what to do.
--
Davey.


Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On 03/02/2016 00:52, Davey wrote:

Good luck with it.
You have to bear in mind that my only experience of this type of horn is from a 1956 Rover which I owned in 1965 (and somebody stole it and wrote it off on a roundabout so I had less than a year's ownership. I can't be absolutely certain that the Rover ones were the same make as the ones you are looking at.
The handbook called the Rover ones "Windtone Horns" if that helps. The Rover ones were two different and complementary pitches (Doh and Soh) and sounded brilliant together. Only one worked when I got the car, but a bit of emery paper to clean the corroded contacts got the other one working, which is why I worried about damp getting into yours.
One final thought - have you considered having yours mounted so that they point down from the headlamp bar? It would certainly simplify the mounting arrangement.
Jim
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On Wed, 03 Feb 2016 08:46:14 +0000

'Windtone' is the Lucas model name, so they were the same units. They usually come in pairs as you describe.
I'll think about that mounting arrangement, thanks. It would certainly deafen any small animals on the ground, although it would diminish the effect for vehicles in front. When I eventually get them installed, I'll post here (if there is still a 'here').
I had a P4 for a short while, but never got involved with the horns. There used to be a black car in our 'gang', it was called Cholmondeley, pronounced 'Chumley' of course, and it was available to anybody whose other car(s) was/were temporarily hors de combat, and who needed transport. The purchase price was always £100 (this was back in the '70s). It got lost over time, nobody knows where the last owner and the car are now.
--
Davey.


Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.