Author Topic: Lucas Altette Car horns on A10s  (Read 960 times)

Online KiwiGF

  • Wise & Enlightened
  • *
  • Join Date: Feb 2011
  • Posts: 1362
  • Karma: 12
Re: Lucas Altette Car horns on A10s
« Reply #15 on: 13.08. 2018 05:45 »
Ha! Just done exactly this except I rewound the coil so that it was 6v rather than 12v. Very simple in that you unwind the coil fold in half and solder the conection onto the middle and then the two remaining ends together, so twice the thickness but half the length. I did this with an aluminium bezel version for my bitsa RE Bullet with great succes some years back. With a Super Rocket one I got the wavy centred horn with the steel bezel. Made new dome headed ba screws for the rim and have them and the bezel off at the platers now.

Out of interest is this method of rewinding only easy on the horns with a core gap adjustment on the rear? The coil on those horns without adjustment appear to held in place by a pressed on washer that looks tricky to remove.
New Zealand

Last had an A10 in 1976, in 2011 it was time for my 2nd one.

1956 Flash Frame EA7-168x Eng. CA10 913x, left BSA together for Liverpool, 5th Dec 1955.

B31 “hot rod” (yeah right)

Armstrong Siddeley Whitley for rainy days (with wife).

GL1800 Goldwing not sure why yet

Offline Slymo

  • A's Best Friend
  • ***
  • Join Date: Jul 2018
  • Posts: 178
  • Karma: 2
Re: Lucas Altette Car horns on A10s
« Reply #16 on: 13.08. 2018 06:54 »
I think the days of cheap Altettes from the wreckers are long gone. I ravaged my older bro’s supply for mine.
NZ

Offline trevinoz

  • Newcastle, N.S.W. Australia.
  • Wise & Enlightened
  • *
  • Join Date: Jul 2006
  • Posts: 2838
  • Karma: 66
Re: Lucas Altette Car horns on A10s
« Reply #17 on: 15.08. 2018 22:54 »
A six volt coil has sixty turns of 0.8mm wire, I have made many of them over the years. This is for the type C but works equally well for the others.
The type B had 68 turns of a lighter gauge.
The armature movement should be in the order of , I think, 0.011" to 0.013".
It varies with the condition of the diaphragm, some work very well with 0.010"
Some trivia, the type B which was introduced for 1949 had a round body for that year only but had the flats the next year.

Offline trevinoz

  • Newcastle, N.S.W. Australia.
  • Wise & Enlightened
  • *
  • Join Date: Jul 2006
  • Posts: 2838
  • Karma: 66
Re: Lucas Altette Car horns on A10s
« Reply #18 on: 16.08. 2018 02:38 »
Further to this on re-reading the first post.
The cast iron body was first used in 1949.
From 1937 - 48 the body was cast iron with 3 screws on the back, 2 for the points mount & 1 for points adjustment.
They were all HF 1234/1235 regardless of the body type.
I don't think that the alloy bezel was used on motorcycle horns though plenty are there now, I have never seen an original 6v horn so fitted, only 12V.
The wire gauge on the early horns winding was 0.6mm, 68 turns.
To rewind, the points have to be removed, easy on the pressed steel body but rivets have to be drilled out on the others.
To get at the winding the retainer must be butchered out, brass on early, aluminium on late.
The horns up to about 1946 had the winding encapsulated so must be chopped out.
I fit the new winding and seal it in position with RTV compound, usually non acidic.
I think that the horn with the rear pole adjuster was first used in 1952.
These are the easiest to get working, no need for multiple gaskets under the diaphragm.

Online cyclobutch

  • Wise & Enlightened
  • *
  • Join Date: Aug 2010
  • Posts: 1419
  • Karma: 14
Re: Lucas Altette Car horns on A10s
« Reply #19 on: 16.08. 2018 11:29 »
I picked up a good looking and original Altette from ebay a couple of years back. All still with nicely chromed furniture. I must have lucked in as it really wasn't much money.

It turned up with connecting wires still attached but clipped an inch and a half or so away from the connectors. Left me with the horrible feeling that maybe the vendor had just half inched it from someone else's machine. It's quite out me off ever fitting it.

I have a certain paranoia for leaving my bike in the same place twice for fear someone would steal the clock - mine is on the cafe racers style plate mounted on the top fork nut. I guess after the speedo the horn is then best highest value and easiest thing to remove.
Various, including ...
'58 Iron Head Flash Bitza


Online KiwiGF

  • Wise & Enlightened
  • *
  • Join Date: Feb 2011
  • Posts: 1362
  • Karma: 12
Re: Lucas Altette Car horns on A10s
« Reply #20 on: 16.08. 2018 13:04 »
I picked up a good looking and original Altette from ebay a couple of years back. All still with nicely chromed furniture. I must have lucked in as it really wasn't much money.

It turned up with connecting wires still attached but clipped an inch and a half or so away from the connectors. Left me with the horrible feeling that maybe the vendor had just half inched it from someone else's machine. It's quite out me off ever fitting it.

I have a certain paranoia for leaving my bike in the same place twice for fear someone would steal the clock - mine is on the cafe racers style plate mounted on the top fork nut. I guess after the speedo the horn is then best highest value and easiest thing to remove.

I hope yr bike is not tampered with but I hope you can see from this thread your best insurance is to pick up a suitable car horn “just in case”!

Whilst I can understand those involved in supplying horns for our bikes need to earn a living, and restoring them is not the quickest or simplest job (so I have no problem with prices like 200gbp) but just for those who want to get an adequate horn for next to nothing I hope this thread has been useful.

I bought 6 horns “randomly” for a total of something like 20gbp and I’ve got 2 half decent ones from those with no additional cost apart from a bit of paint. Some mates will no doubt get the spare ones off me as I’m easily bribed with a beer  *beer* .

I have not taken the option but on top of the purchase cost would be the cost of a chromed bezel and set of nuts is what you want to get the correct look, and there are a few sources of these (some cheaper than others). Hopefully this thread will enable readers to pick up the correct horn from a car breakers etc. if you are a rivet counter (no offence) you should be able to make sure you have the correct number of nuts on 5he back of your horn  *respect*

Cudos to Trevinoz who has provided some “missing bits” of information, and also given us the method and coil specs so we can make a 6v horn from 12v, that’s my next mini project. I’ll report back how that goes with some pics (unless Trev beats me to it).
New Zealand

Last had an A10 in 1976, in 2011 it was time for my 2nd one.

1956 Flash Frame EA7-168x Eng. CA10 913x, left BSA together for Liverpool, 5th Dec 1955.

B31 “hot rod” (yeah right)

Armstrong Siddeley Whitley for rainy days (with wife).

GL1800 Goldwing not sure why yet

Online Bsareg

  • A's Best Friend
  • ***
  • Join Date: Mar 2016
  • Posts: 249
  • Karma: 2
Re: Lucas Altette Car horns on A10s
« Reply #21 on: 16.08. 2018 18:05 »
I was at the VMCC festival of 1000 bikes at Brands Hatch when a call went out over the Tannoy to keep our eyes out for someone carrying a Lyta tank pinched from one of the bikes there. Never heard if he was caught but there are a few good high trees at Brands if he was.
C11,B40,B44 Victor,A10,RGS,M21,Rocket3,REBSA

Online chaterlea25

  • Wise & Enlightened
  • *
  • Join Date: Jun 2009
  • Posts: 3096
  • Karma: 45
Re: Lucas Altette Car horns on A10s
« Reply #22 on: 16.08. 2018 18:35 »
Hi All,
I'm sure I heard of a similar story a while ago *????*
Hanging is too good for the bsatards *angry* *angry*

I remember some years ago seeing "security" tank centre bolts advertised
Wish I had bought some then *sad2*
At the moment I have two tanks being repainted one is an original RGS that has been de dented and rechromed
the other is a copy but quite a good one, I need to come up with something like those bolts above  *????*

Friends with vintage cars always remove radiator and other easily removable item when they put their cars on show
About two/three years ago at Stafford the stall holder next to me had a chronometric speedo stolen
later that day I spoke with another stall holder who had a rare magneto stolen
I keep all the goodies in perspex covered display boxes now, and have resorted to tying a few big items to the table using inner cable

John

1961 Super Rocket
1963 RGS (ongoing)

Offline trevinoz

  • Newcastle, N.S.W. Australia.
  • Wise & Enlightened
  • *
  • Join Date: Jul 2006
  • Posts: 2838
  • Karma: 66
Re: Lucas Altette Car horns on A10s
« Reply #23 on: 16.08. 2018 22:35 »
Kiwi, a couple of pictures of the new coil and as fitted.

Online a101960

  • Wise & Enlightened
  • *
  • Join Date: Sep 2007
  • Posts: 1031
  • Karma: 11
  • BSA RGS BSA C12
Re: Lucas Altette Car horns on A10s
« Reply #24 on: 17.08. 2018 09:11 »
Quote
I remember some years ago seeing "security" tank centre bolts advertised
Wish I had bought some then *sad2*
John, as far as I am aware, these bolts are still sold by George Prew.

Online chaterlea25

  • Wise & Enlightened
  • *
  • Join Date: Jun 2009
  • Posts: 3096
  • Karma: 45
Re: Lucas Altette Car horns on A10s
« Reply #25 on: 17.08. 2018 19:57 »
Hi A10,
Thanks, I will check with him
John
1961 Super Rocket
1963 RGS (ongoing)

Offline Slymo

  • A's Best Friend
  • ***
  • Join Date: Jul 2018
  • Posts: 178
  • Karma: 2
Re: Lucas Altette Car horns on A10s
« Reply #26 on: 24.08. 2018 02:59 »
Got the rim and the new 3/8” homemade dome screws back from the platers today. Gotta say I’m chuffed with the result. Certainly prettier that the house paint yellow one that I got from my Bro.
NZ

Offline kiwipom

  • Resident Legend
  • *****
  • Join Date: Jan 2011
  • Posts: 751
  • Karma: 8
Re: Lucas Altette Car horns on A10s
« Reply #27 on: 24.08. 2018 05:57 »
hi Slymo,  nice job will it fool the `bean counters` cheers
A10.G.Flash(cafe racer)Honda 250 vtr. Yamaha Virago XV920.

War! what is it good for?Absolutely nothing, Edwin Star.
NewZealand

Offline Slymo

  • A's Best Friend
  • ***
  • Join Date: Jul 2018
  • Posts: 178
  • Karma: 2
Re: Lucas Altette Car horns on A10s
« Reply #28 on: 24.08. 2018 06:04 »
Hope so, my mate suggested punching Altette into the rim prior to plating but I thought that was asking for tuts from the anorak brigade. :)
NZ

Online Black Sheep

  • Resident Legend
  • *****
  • Join Date: Apr 2017
  • Posts: 599
  • Karma: 6
    • Where black sheep live
Re: Lucas Altette Car horns on A10s
« Reply #29 on: 24.08. 2018 06:31 »
Punching Altette onto the rim. Hanging offence clearly. It's not just tanks that can disappear. Came back to my Norton once and found it minus timing cover, rev counter gearbox and rev counter.  So it must have been a fellow Norton owner. Rather disappointing. At least he left me the screws. 
2 twins, 2 singles, lots of sheep