The following Weber carburetor types have been fitted:

  • New 500 ——————— 26 IMB 1
  • 500 Sport ——————– 26 IMB 3
  • 500D————————– 26 IMB 4
  • Station Wagon ————- 26 OC
  • 500F ————————– 26 IMB 6
  • 500L ————————– 26 IMB 10 (incorporates CO limiter for idling)

The weber 26 IMBl carburetor is a downdraft, single body carburetor with 1.0236” (26 mm) diameter throat at the height of throttle shaft.

The fuel mixture rating system consists of a throttle valve controlled by accelerator pedal through a cable which operates a lever secured to throttle valve shaft. This carburetor is fitted with a progressive-action starting device which enables the driver to suit the mixture richness to the most varied conditions of starting, until the engine has reached the rated operation temperature.

The dampened needle valve ensures a smooth engine running since, thanks to its dampening device, it is not affected by vibrations and, therefore, keeps steadily constant the level in carburetor bowl.

Operation.

weber carburetor diagram

Diagrammatic section of Weber 26 IMB1 carburetor

1. air corrector jet  2. air inlet  3. idle speed mixture duct  4. idle speed jet holder  5. idle speed air orifice  6. filter cover  7. Filter  8. fuel inlet connection  9. needle valve seat  10. Needle 11. float pivot  12. Float  13. idle speed jet  14. main jet holder   15. main jet  16. Bowl  17. idle speed mixture adjustment screw  18. idle speed mixture orifice  19. Throttle  20. transition hole  21. primary Venturi (not interchangeable)  22. emulsion orifices  23. emulsion well  24. secondary Venturi (not interchangeable)  25. main nozzle

Referring to the diagram. the air from above, [More]

Website for Sale

by Miller | April 29, 2009 | In Uncategorized No Comments

This website  fiat500america.com is for sale! 

Sorry but i no longer can keep up with it or complete my creation, If anyone is interested in taking it over pls email me at   Jmiller@valquest.com  I can supply traffic and stat details upon request.  Website is created in wordpress.

 

 Withdrawal Mechanism

 

This mechanism consists of:

 

     a forked lever, integral with a shaft (passing through clutch housing) on which the outer operat­ing lever is keyed;

     a return spring, connected to outer operating lever and anchored on gearbox casing. When in normal position, this spring keeps the central thrust carbon ring away from withdrawal levers carrier ring. The carbon ring is pressed against carrier ring by the throwout ring connected to forked lever.

 Clutch pedal must have a free travel of 1 3/8” to 19/16” (35 to 40 mm). Should any correction be required, turn in or out the release lever control tie rod, which is adjustable.

After adjustment, lock by nut and jam nut

 

clutch throwout mechanism

clutch throwout mechanism

clutch controls and adjusting mechanism

clutch controls and adjusting mechanism

 

 

 

 

 

 

 


Fiat 500 Abarth breaks free in Geneva

The Fiat 500 Abarth, the hot version of Fiat’s new small car that is breaking sales records in all its markets, has made its debut at the Geneva International Motor Show (4 March 2008) with Fiat forgoing the usual show girls to pull the covers of its new 99 kW hot baby, replacing them with two owners of the original 500 Abarth who have gone onto rather bigger things in the industry – Fiat Group CEO, Sergio Marchionne, and Ferrari President, Luca di Montezemolo.

Faithful to the saying coined for Abarth cars in the 1960s (‘small but wicked’), the 500 Abarth promises to be a ‘small’ car with generous performance qualities. The car on display at the Geneva show is equipped with a Fire 1.4 16v Turbo petrol engine which delivers a maximum of 135 bhp (99 kW) at 5,000 rpm and peak torque of 206 Nm at 3.000 rpm in ‘Sport’ mode (in ‘Normal’ mode torque is reduced to 180 Nm at 2,500 rpm). This brilliant, smooth new engine is also a friend of the environment: like the regular Fiat model it is derived from, the new Abarth will respect future Euro 5 legislation.

Another interesting feature of the 500 Abarth is the fact that it adopts the new TTC (Torque Transfer Control) system, which improves the transfer of drive torque to the wheels, but, above all, ensures that the car behaves impeccably on bends, making it safer and more entertaining to drive when you put your foot down.

Aggressive, functional styling

Respecting Abarth tradition in full, the styling of the 500 Abarth is not a mere exercise in interpretation, because it significantly improves the car’s performance. The best proof of this stylistic approach can be found in the attention paid to the aerodynamics and functionality of certain elements. For example, compared to the basic body, the 500 Abarth optimises aerodynamic behaviour both with the roof extension and a large winged spoiler, and with a ‘slide’ that links up to the underbody, optimising the airflow output, and involving much of the rear bumper.

Underlining two sporting elements – the spoiler and the slide – help to reduce drag and increase grip at high speed. What is more, the front slits on the bumper heighten the sporty styling but also perform a useful function, cooling the two intercoolers positioned at the sides. That is not all. On either side of the ‘slide’, there is an exhaust pipe that corresponds to the symmetrical exits of a single silencer positioned transversely (branded with the scorpion logo, like those in the 1960s).

On the side, sideskirts envelop the curves of the car creating a more vertical profile, which improves the Cd. But it is the front that really announces that the 500 Abarth has the equipment of a true GT: the ‘triptych’ of air intakes consists of a central inlet, which is larger than on the basic model, with a much broader upper slit (above the number plate); the two ‘nostrils’, positioned symmetrically at the sides of the bumper, correspond exactly to the position of the two identical intercoolers, which are just visible through the ‘nostrils’, guaranteeing airflow in and out.

The nose with its trim has been ‘pushed forward’ to create the space necessary for the turboblower; this makes the side view of the 500 Abarth more pronounced and obvious, in perfect harmony with Abarth tradition, recalling the 850 TC and 1000 TC, on which the externally applied manifolds were immediately visible and recognisable as a characteristic feature of the brand. The trim itself differs from the one on the Fiat 500 because it is in a single piece: the Abarth logo, which appears for the first time without a chrome surround, ‘floats’ on a finned surface that serves as an additional air intake. The Abarth shields positioned on the sides are shot through by a tri-colour arrow, like the ones on the Abarth 595 and 695 in the 1960s, a symbol of the brand’s racing image

And finally, the 16” and 17” wheel rims come in different styles: from multiple spokes to beading of the bore holes (a clear reference to styles adopted for forged wheels in the 1970s).

‘Racing’ interiors for extremely enjoyable driving

Inside, the ‘cockpit’ of the 500 Abarth features special instrumentation which is derived from the outfit on the Fiat model, with the addition of an analogue pressure gauge to measure turbo pressure. It incorporates a LED telltale that optimises gear changes by lighting up at the appropriate moment. The main instrumental panel, with its sports graphics, is protected from glare by an upper lip, while the three-spoke steering wheel has shaped thumb rests, is ‘flattened’ at the bottom to increase roominess, and is adjustable. The aluminium pedals with their rubber trim have a decidedly ‘racing’ look, like the gear lever knob (covered with leather with a more anatomical grip for sporty driving). The same approach is evident in the seats – of the ‘one-piece’ type, incorporating the head-restraint into the squab – which are upholstered with a choice of materials: fabrics in different combinations of colours and textures, and two versions of leather (black or red). The headlining and the side trims are black, giving the interior a more technical, sporty look.

Fiat 500 Abarth: a story of records and successes

The roots of the new 500 Abarth go deep into the history of motorsport in the Sixties. A brief history follows of the forefather of the car displayed today in Geneva.

It all began in July 1957 with the launch of the ‘Nuova 500’, the car created by Dante Giacosa and powered by a twin-cylinder engine (capacity of 479 cc) that delivered a maximum of 13 bhp, for a top speed of 85 km/h. Carlo Abarth fell in love with this small Fiat, and immediately recognised a challenge: he was soon convinced that, with suitable tuning, it could become a very fast little car. He maintained the original cylinder capacity, but increased the compression ratio (from 6.55:1 to 8.7:1), and fitted a Weber 26 IMB carburettor and a special Abarth exhaust: this generated an extra 7 bhp compared to the basic model, bringing it up to 20 bhp which, with successive tuning stages, eventually reached 23 bhp.

On October 15, 1957 a number of similarly tuned cars, but all with standard bodywork, were sent to the Monza racing circuit for a speed test, to show that the ‘Abarth treatment’ could produce extraordinary results.

The injection of horsepower and the special Abarth edition of the ‘Nuova 500’ made a significant contribution to the success of the standard model. That same year two more versions of the new Fiat also appeared: the ‘500 Coupe’ Zagato and the ‘500 Coupe’ Pininfarina. The first won for Abarth in the Italian Class 500 Championship of 1958, driven by Ovidio Capelli. That same year, Carlo Abarth wanted to show that the ‘Nuova Fiat 500’, suitably transformed and with even more power, could produce brilliant performance (compression ratio of 10.5:1, optimised intake and exhaust, power delivery of 26 bhp and top speed of 118 km/h), and as a result for a whole week the small Fiat – sporting a Scorpion on its front – performed a ‘marathon’ that went down in history: in seven days and seven nights it covered a distance of 18,186 kilometres at an average speed of 108 km/h, breaking 6 international records, by travelling:

  • in 4 days, 10,457 km at an average of 108.9 km/h;
  • in 5 days, 12,933 km at an average of 108.2 km/h; 
  • 15,000 km in 139 hr 16’ 33” at an average of 107.6 km/h;
  • in 6 days, 15,530 km at an average of 107.8 km/h; 
  • 10,000 miles in 149 hr 09’ 29” at an average of 107.8 km/h;
  • in 7 days, 18,186 km at an average of 108.2 km/h.

With this umpteenth success, Carlo Abarth proved that it was possible to build racing cars derived from small runabouts, and the motto ‘small but wicked’ was coined.

And so the Sixties started; they have since been described as the heyday of the Scorpion, thanks to its huge success in racing and on the market. This decade also represented the period of the greatest generational rebirth in the Twentieth century. The age of technology began: in the space industry, preparations were underway to put a man on the moon, eight out of ten Italian homes now had a television, people travelled by car listening to the radio, all types of periodicals and publications were born, habits were changing, and so were the Italians.

It was no coincidence that the most important developments to the ‘500’ Abarth were introduced in this revolutionary period. In 1963, Carlo Abarth, who was a natural technologist and innovator, decided that he wanted to make the new ‘500’ even faster; so he increased the cylinder capacity from 499.5 cc to 595 cc, obtaining a power delivery of 27 bhp. The extensive work carried out on the engine and changes to the fuel feed system, with the adoption of a Solex C28 PBJ carburettor instead of a Weber unit, enabled the Fiat 500 Abarth to pass the 120 km/h mark.

The Scorpion’s small sports car was immediately recognisable by the Abarth grille on the nose, accompanied by the distinctive metal logos of the model and the Abarth shield on the sides, with the claim ‘Campione del Mondo’ (World Champion).

A few months after the market launch of the ‘595’, the plant in Corso Marche launched the ‘conversion box’ containing all the parts necessary to make a Fiat Nuova 500 identical to an Abarth 595, in terms of engineering but also of styling: pistons, camshaft, engine, cylinder head gasket, exhaust, oil sump, chrome-plated grille with lateral trims, enamel shield and chrome wording.

This showed that Carlo Abarth’s engineering genius was attune to the aspirations of the young, managing to meet the demand for brilliant performance even on cars used for everyday driving and not only to race.

For the Corso Marche plant, 1964 began with the presentation of the Fiat Abarth ‘595 SS’, an even more evolved, more powerful version of the ‘595’. This small bombshell developed as much as 32 bhp for a top speed of over 130 km/h, causing quite a stir in the racing world. It differed from the previous model for the black rubber hooks on the bonnet, the ‘SS’ logo on the front and rear lids, and ‘esse esse’ written on the dashboard.

They were stylistic details that underlined the sporty personality of this small car. And it was by then customary for Abarth to market not only the car but also a conversion kit that allowed the owner of a Fiat 500 to transform it into a ‘595’ SS, and to put himself behind the wheel of a real Abarth sports car.

The last version of the ‘595’ was the ‘595 SS Competizione’: wider track, wider tyres, wheelarches with protruding red shanks, a power delivery of 34 bhp and a top speed of 130 km/h. In other words, Carlo Abarth had created a new car for new victories. The roll of honour of this runabout with the Scorpion treatment included a long, long list of triumphs, from its debut at the Monza circuit in 1964 with Franco Patria, right down to the Italian Touring Trophy 600 class with Leonardo Durst at the end of the same year.

Clutch Specifications

by Miller | January 21, 2009 | In Clutch No Comments

 

CLUTCH SPECIFICATIONS

(See Exploded Clutch View)

Type ………………………………………… Single plate, working dry
Driven plate with facing of ……………………. Ferodo
Facing O. D. …………………………………… 5.51″ (140 mm)
Clutch springs:  
Part No. ………………………..

Wire diameter …………………

Spring O. D. ……………………

Number of working coils ……..

Total number of coils …………

Free length ……………………

Seated length …………………

Corresponding load …………..

Minimum load ……………….

891312

.1102″ ( 2,8 mm)

.9134″ (23,2 mm)

6

71/2

1.6417″ (41,7 mm)

.9646″ (24,5 mm)

51.80 + 2.65 lbs (23,5 + 1,2 kg)

43 lbs (19,5 lbs)

Lever carrier ring springs:  
Part No. ………………………………………

Wire diameter …………………………………

Spring O. D. ………………………………….

Number of working coils …………………….

Length, taut spring under 1.1 + .11 lbs (0,5 + 0,05 kg) of load

Mounting length ………………………………

Corresponding load……………….. ……………

891319

.394″ (1 mm)

.3740″ (9,5 mm)

10 1/2

.7677″ (19,5 mm)

1.1811″ (30 mm)

4.85 + .44 lbs (2,2 + 0,2 kg)]

Pedal free travel …………………………………… 1 3/8 ” to 1 9/16″ (35 to 40 mm)
Driven plate facing max. permissible out-of-true …….. 0059″ to .0115″ (0,15 to 0,30 mm)
Clearance between clutch shaft and clutch hub splines:  
Longitudinally …………………………

Crosswise ………………………………

.0020″ to .0039″ (0,05 to 0,10 mm)

.0059 to .0118″ (0,15 to 0,30 mm)

CLUTCH SERVICING    INSTRUCTIONS

 

Removal and Installation.installing the clutch on flywheel using pilot to center the driven plate
 
 
 To remove clutch from car, first disconnect gearbox from engine and then take off the screws securing clutch to flywheel.

 

This also frees the driven plate.

 

To install clutch on flywheel, use as a guide flywheel locating dowels.

 

Prior to tightening down clutch mounting screws, align driven plate.

 (pic. installing the clutch on flywheel using pilot to center the driven plate)

Pilot Bushing.

 

Whenever clutch unit is disassembled, it is es­sential to check that pilot bush on crankshaft for, 

- clutch shaft rear support

- is not damaged or ex­cessively worn.

 Clutch shaft tang on bush end must also be found in good condition.

 

Max. clearance between clutch shaft tang and bush must not be greater than .0059″ (0,15 mm), otherwise pilot bush must be replaced.

 (pic. clutch assembly installed on engine)

 

Disassembly.

 

Unhook the withdrawal lever carrier ring springs and take out the ring.

 

Unscrew the withdrawal lever fixing nuts on bolts and remove the levers and washers; slacken gradually the three T-handles to relieve pressure of clutch springs.

 

Next, take off clutch cover, springs and lever mounting bolts.

 (Pic.location dowels on flywheel for clutch centering)

 

 

Pressure Springs.

 

When servicing the clutch, always check springs for perfect efficiency. In case springs are exces­sively weak - i. e., the spring length of .9646 (24,5 mm), corresponding to the actual assembly value, is obtained with a load of less than 43 lbs (19,5 kg) - replace the springs.

 (Pic. pressure spring specifications)

Withdrawal Lever Carrier Ring Retain­ing Springs.

 

The length of closed springs, under rated clutch load, is .7677′ (19,5 mm), while the length of ex­panded springs (under a load of 4.85 .44 lbs -2,2 ± 0,2 kg) should be 1.1811″ (30 mm). If an excessive weakening of springs is noticed, replace the springs.

 (Pic. withdrawal lever carrier ring retaining spring specifications)

Withdrawal Levers.

 

Check the withdrawal levers and their bolts for excessive wear, and replace [More]

 

On July 4, 2007 Fiat officialy launched the New fiat 500

The new 500 is a cute, playful compact small 3-door car with soft rounded styling.. It is 355cm long, 163cm wide, 149cm high, and has a wheelbase of 230 cm.

The Exterior:
The front combines the family feeling of the most recent Fiat models, with the distinctive elements of the first 500. For instance, you’ll notice features like the round upper headlights above and main beam lights below, as well as the familiar whiskers and logo.

On the side, the mid-line slopes slightly at the front giving the car an impression of sturdiness.
While the rear features a distinctive chrome handle reminiscent of the number plate light holder found on the original model, and similar in shape to that of a bicycle saddle.

The 500 is available with four different trim levels: Naked, Pop, Lounge, and Sport. Customers can choose also between 15 interior trims, 9 wheel options, 19 decals, and 12 body colours. There are over 500,000 different personalized combinations of the 500 that can be made by adding all kinds of [More]

The generator and centrifugal fan are V-belt-driven through pulleys: the centrifugal oil filter cover/pulley on crankshaft transmits the drive to the pulley on generator.

A= Normal give-in: about 13/32" (1cm) under a 22 lbs (10kg) pressure; B= Nuts securing the pulley halves with spacer rings

Belt tension is correct when, under a hand pressure of about 22 lbs (10 kg), the belt sags l3/32″(1 cm)

(fig. to the left:
A= Normal give-in B= Nuts securing the pulley halves with spacer rings.)

A slackened belt slips and will not drive the generator and centrifugal fan at the required speed.
Under these conditions the belt will wear rapidly. Conversely, a too-tight belt induces an abnormal
strain on generator bearings.

To permit the adjustment of belt tension, the pulley on generator is demountable in two halves between which spacer rings are squeezed. Tension is increased or reduced by reducing or increasing the number of spacer rings, respectively.
Place the spacer rings removed from between the pulley halves on pulley outer face so that rings may be reinserted when fitting a new belt.


Lets learn a bit more about the Fiat 500 clucth. 

The clutch is a single disc design and incorporates a driven plate ( which carries the friction materials on each side) and a pressure plate and cover assembly. On early cars the pressure plate is tensioned by coil springs and the pressure is taken off by a central release ring linked to three release lever which pivot on the cover.

 The clutch operating lever pivots in the forward end of the gearbox casing and thrust bearing on the inner end bears on to the release ring when the arm is operated. The operating arm is moved by a cable from the [More]

HERE YOU WILL LEARN WHERE AND HOW TO IDENTIFY YOUR FIAT 500 MODEL, ENGINE, CHASSIS, COLOR & PARTS ORDERING NUMBER.


Numerous models of the FIAT 500 have been produced over more than a decade. There are, therefore, many different models which have been developed considerably from the first.


Below is you Fiat 500 Identification plate, to understand how it reads i have broken it down for you.
[More]

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