Servo adaptor

[T100SS]

Firstly apologies if this has been covered - I get error 401 when I try to get the tech pages.

I've bought a 'universal' servo kit for my 71 Traveller (1098) but there is no adaptor to fit to the manifold. My first thought is to get something made up or hopefully buy off the shelf; and either way I drill and tap the inlet manifold. This involves hidden costs like new gaskets, drill bit and and tap.

Then I find a kit that includes longer mounting studs for the carb and a fat insert with adaptor for hose coming off that. Seems a lot at 25 quid plus vat but an easy option. My worry is that longer inlet tracts affect performance (in exaggerent examples it improves low-end grunt but top end power suffers?), so are these kits a wise option?

Indeed, reverting to plan A, is there not an inlet manifold off a later model that had a servo feed and will bolt straight on? If so, can anyone tell me which model of Austin/Morris/Whatever and where I might get a reasonably priced used one?

PS I am replacing all the drums and shoes plus anything else I might find as a matter of course. I used to drive Moggies without servos no probs but these days I take all the help I can get:)

Alex

[bmcecosse]

If the brakes are in good condition - you really really don't need a servo........ But yes, if you must - there are some later A series engines that had a servo take-off tapping. Don't worry about lengthening inlet tract - it's not going to make the slightest difference to a standard engine.....

[T100SS]

Thanks for that - now that I have replaced several parts I can see why people suggest a servo is surplus to requirement. As I go through the brakes performance is improving, however, without going into boring detail I have a condition that means any effort/load transferred through the hips is undesirable (which is why I prefer to ride a motorcycle). So any labour-saving device is welcome.

I have bought a kit and in readiness for fitting I went under the bonnet to find a suitable site for the servo... ...ah...I feel a new post coming on...

[chrisryder]

it may be an expensive kit to fit that sandwich plate, but consider the alternative of time taken removing the whole manifold to drill and tap it. adapters are available reasonably easily, but sourcing a tap of the correct thread can cost as much as the adapter! for something you're only going to need once (possibly twice) it seems silly to buy the tap! fortunately my manifold already had a blanking plug, so i've not had that problem.

if you're going to the trouble of removing your manifold to fit with a different one, you may aswell drill the one you take off.

i've had reasonable success in fitting the servo down on the engine bay floor next to the starter motor. it's where the brake lines go between the master cyl and that front T piece, so it doesn't require much pipework jiggery pokery.

[bmcecosse]

It does need to be as low down as possible - to minimise risk of air bubbles in the pipework, due to the low mounted master cylinder.