Disc Brake Conversion

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Update For 2013

It’s been ages since this thread was updated, mostly as its been on the road being used and enjoyed! Since I last updated it was involved in an accident (a mondeo owner decided to reverse into it) and its since been repaired, (done in house rather than left to insurance.) It’s passed another MOT in september with one advisory for an oil leak!

The big changes are the wheels which have been widened! The standard 12″ diameter wheels have gone from 3.5J all round to 5.5J at the rear and 4.5J on the fronts. This gives a benefit in grip and handling, as well as adding a subtle dish to the wheels which really increases their kerb appeal. The wider wheels have also been fitted with new Falken tyres, Since the photos were taken its also been treated to new shiny chrome hub caps.

The dash still needs to come out for a coat of paint and some new vinyl on the top. There are plans to send a number of bits off for chroming including the gear stick, dash heater vent surrounds, sun visor mounts, gear stick and handbrake surrounds. There’s also a plan to re-introduce period Britax seatbelts (chromed, of course!)

Outside the front indicators have been swapped for clear glass lenses, (some rebels appear like this in the advertising material.) A new old stock rear bumper has been fitted! replacing a slightly pitted original. I’m still on the lookout for a perfect front bumper to match! (although most of the mondeo dent has now been removed) In the near future the grill is going to be fitted with a stainless mesh to help protect the radiator.

The engine is still the 600cc engine that was dropped in as a temporary measure and has coped with the unfair demands put on it far better than we ever thought it would! It has a tendency to burn oil though and what it doesnt burn it chucks out the crankcase breather at an alarming rate… It also returns a fairly shocking mid 20′s mpg! The plan is still to drop in a tuned custom built race engine, which is in progress. This can’t turn out to be any less fuel efficient even with the Dellorto FZD I’m planning on fitting!.

An order has just been placed for a set of fully adjustable Gaz shocks and springs which will hopefully further enhance the handling.  :)

As seen here in some recent photos:

Showing new wheels and tyres:

Work on the front brake Disc conversion is almost finished – I’ve been working on a setup allowing disc brakes to be used with the original 12″ road wheel diameter. A standard Spitfire setup has clearance issues as well as being the wrong PCD, after much thought (or speculation?) I’ve come up with a solution which should be more than adequate for a Rebel….

This is a unique setup utilizing machined Vauxhall Firenza Hubs with turned steel adapter rings to take re-drilled triumph Spitfire Discs running on modified Scimitar 5 – early5a stub axles attached to New old Stock Triumph Spitfire Vertical Links, Inner bearings are on a specially turned 316 stainless spacer on which the Lip type hub seal also runs. Calipers are Genuine Girling type 14′s with new pistons and seals fitted with Mintex pads intended for an Austin Maxi!.
Whilst this might sound like a complex nightmare it should mean that future service parts (bearings, Discs, seals etc)will be readily available off the shelf with only the stub axles requiring turning down in a lathe, it also increases the front track width by 2″ which combined with the wider wheels should make the car handle even better than at present.

This shows the Viva Hub attached to the Spitfire disc:

Rear view showing the adapter ring mounted inside the disc:

Spitfire Vertical link and dustshields:

Rebuilt Type14 Caliper:

Complete Assembly:

Another modification I’ve been working on is a fully synchro’ Gearbox – The early semi-synchro rebel Gearbox is derived from the Regal¬† but has a much longer mainshaft and a tailshaft extension with remote gearchange mounted on top – This remote is a precise feeling short throw setup which gained much praise in period reviews (virtually always considered best in its class). Later 750cc Rebels have a fully synchro gearbox but lost the remote change, as well as having synchromesh on first/second this box also benefits from a higher ratio gearset and better parts availability (close ratio gear-sets are also available for this box!). I decided to build a gearbox based on the 750 box but having the benefits of the early boxes Remote Change, this is complicated somewhat as reverse is a longer throw on the later box as well as being in a different position.

Having decided to create the ultimate Rebel gearbox it stood to reason the antiquated carbon clutch release bearing setup should be engineered out – Later three wheelers use a Ford Fiesta/escort roller bearing clutch – although this was only made as a cable operated setup. I’ve decided on a hydraulically operated system as this will be smoother and more robust, this has required welding bushes into the bell-housing to take a vertical cross-shaft to mount the Ford bearing on.
All Rebels (and most 3 wheelers) are fitted with inertia starters – When starting from hot it inevitably takes two or three attempts before the engine fully catches as the inertia starter gets kicked out as soon as the engine try’s to fire.

Very late three wheelers have a pre-engaged starter and therefore a different bell-housing, unfortunately these gearboxes are not compatible with a Rebel tailshaft extension so I’ve taken a section from one of these later bell-housing and welded it into my inertia gearbox.

The end result will be a Franken’Gearbox which will have synchromesh on all gears. Short throw remote gearchange, Pre-engaged starter and Hydrualicly operated Ford Roller Bearing Clutch, This is built using entirely New old Stock components with the exception of the Mainshaft and the case.

Overview of modified gearbox with remote change unfitted:

Section removed from original bell-housing:

Showing section from late pre-engaged box welded in and (unfinished) clutch operating shaft and arm fitted:

Arrangement of Ford release bearing – Note newly drilled inspection hole filled with rubber plug for checking bearing once fitted to car:

I’ve modified the flywheel from the standard 3 bolt fixing:….

And drilled and threaded the crankshaft to suit:….

As a reward for reading this far here’s a Video of the Rebel razzing it’s knackers off down the Military Road…