Unsprung weight on a Series 2A

[Warb]

I'm contemplating a brake upgrade on a SWB 2A, using LWB drums. This gives the decision of the narrow or wide (6cylinder) drums on the front.

Assuming all other things are equal, suitable master cylinder and servo/booster is fitted, the pratical difference between the 2.25" and 3" wide drums/shoes comes down to unsprung weight.

So, on a Series 2A Land Rover, which is not the highest performing vehicle in the world (!), is the additional unsprung weight of a 3" drum going to make any noticeable difference?

Given the already high (by modern standards) unsprung weight resulting from solid axles, diffs, drum brakes, large steel wheels and heavy tyres, my suspicion is that the relatively small extra weight of 3/4" of drum will make no difference, but I'm interested in other peoples opinions.

[JDNSW]

I doubt whether the difference is noticeable. In fact, I doubt there is a significant difference in weight between the wide and narrow drums, and the difference in weight between the shoes and backing plates would be pretty small. Certainly, there is a difference in weight between the 10" and 11" brakes, but compared to the overall unsprung weight it would be pretty small.

I very much doubt that the extra width of the six cylinder drums is justified for the swb.

John

[Warb]

I very much doubt that the extra width of the six cylinder drums is justified for the swb.

I tend to agree, but it also comes down to what is available at the time. Many/most components are available new, and the prices do not vary much between 4cyl and 6cyl, but I've yet to find a source of new backplates. So if I can find a 4 cylinder donor set I'll use it, otherwise....

[JDNSW]

I tend to agree, but it also comes down to what is available at the time. Many/most components are available new, and the prices do not vary much between 4cyl and 6cyl, but I've yet to find a source of new backplates. So if I can find a 4 cylinder donor set I'll use it, otherwise....

Not surprised that you can't find new backing plates, but there should be plenty available s/h - they are not something that either wears or rusts. About the only thing that goes wrong with them is the adjuster, and you can buy replacements for them.

John

[Warb]

I've been looking for a 4 cylinder set, but without any luck. I've even been tempted to buy another entire vehicle as a donor, but finding one cheap enough and close enough may take some time. And whilst I still haven't decided whether to restore it or start scavenging bits, I have a 6 cylinder with all new brakes that I could use as a donor.......