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BPF headlamp bulb

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BPF headlamp bulb

Postby bad_friday » Sat Dec 24, 2016 2:21 am

I've bought a H4 headlamp bulb: http://www.classic-car-accessories.co.u ... tml#aCLB60
But unfortunately it is a lose fit in the BPF socket.

Any idea for a solution?

Fritz
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Re: BPF headlamp bulb

Postby L.A.B. » Sat Dec 24, 2016 5:40 am

I think we need more information.

A standard BPF headlamp usually has this type of bulb holder/retainer....
Image

......therefore requires a bulb with this type of cap (whether QH or not)......
http://www.norbsa02.freeuk.com/goffybulbs.htm
Image

....but the bulb you have bought appears to be this (463).....
Image
In the 1970s Lucas introduced the P36t 463. This was a 'half way house' between the British Pre-Focus bulbs and the later P45 & P43t. These had the British Pre-Focus fitting but with a H4 Halogen envelope in 12V 60/55W and the 3 spade push on connection.



....according to the Commando parts books, the '463' bulb was for the 'UK' halogen light unit option which also had a different lens/reflector and Lucas 553738 bulb adaptor, also, according to the parts books, the 'Continental' halogen headlamp option was different again, as that had a '472' (P43t) bulb.

Image

Later Lucas halogen motorcycle headlamps (as fitted to late Triumphs) used '410' P45T bulbs:
Image
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Re: BPF headlamp bulb

Postby bad_friday » Sat Dec 24, 2016 6:53 am

Thank you L.A.B. for the brief explanation.

Everything you say is correct. But, it's impossible to fix the 463-type in place with any socket on the market.

Fritz
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Re: BPF headlamp bulb

Postby L.A.B. » Sat Dec 24, 2016 6:57 am

bad_friday wrote:
Everything you say is correct. But, it's impossible to fix the 463-type in place with any socket on the market.


That appears to be because the 463 bulb doesn't fit the [Edit] earlier BPF reflector unit but I am not sure why.
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Re: BPF headlamp bulb

Postby L.A.B. » Sat Dec 24, 2016 7:28 am

According to the parts books, the 463 bulb needs a Lucas 553738 adaptor, but that doesn't appear to have any means of retaining the bulb in the reflector, so I don't know exactly what held the 463 bulb in position.

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Re: BPF headlamp bulb

Postby bad_friday » Sat Dec 24, 2016 9:30 am

L.A.B. wrote:According to the parts books, the 463 bulb needs a Lucas 553738 adaptor, but that doesn't appear to have any means of retaining the bulb in the reflector, so I don't know exactly what held the 463 bulb in position.

http://www.bobine.nl/jaguar/wp-content/ ... 537381.jpg


Great. I've found this http://www.bobine.nl/jaguar/wp-content/ ... 554691.jpg

Probably this is the right one and I can use it as a sample for a self made adapter.

Or this http://www.holden.co.uk/displayproduct.asp?pCode=554691. It's more confident than the usual BPF sockets.
So, I think I'm using the P36d-Bulbs I have on the shelf and trash the 463 bulbs (a $12.-- value).


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Re: BPF headlamp bulb

Postby bad_friday » Mon Dec 26, 2016 6:13 am

My solution: A springiliy clamp which jams inside of the tube and presses the disc on the bulb to the reflector. So i can use this connector http://www.norvilmotorcycle.co.uk/068033A.jpg together with the 463 bulbs.

Fritz
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