Tiny but Mighty: the Abarth 500-595-695

Younger people today, familiar only with the specifications of contemporary/recent cars, may well wonder if someone is joking if they take a glance at this set of numbers which define a newly launched compact saloon: Engine capacity: 479 cc; Engine power output: 13 bhp; Kerb weight: 470 Kg; Length: 2970 mm; Width: 1320 mm; 0-60 mph: 1 minute or thereabouts; Top speed: 53 mph.  Now that launch was way back in 1957, so that explains a lot, but even that long ago the majority of potential buyers did not find themselves attracted by those performance numbers.  The situation did however provide Carlo Abarth with an exciting opportunity and he seized it speedily and with enthusiasm.  As a result, the Abarth version of the Fiat 500 Nuova was ready for presentation within a few short months.  With the two cylinder engine’s compression ratio raised, a Weber 26 IMB carburettor fitted and a sports exhaust, the Fiat Abarth 500 had 21.5 bhp to play with.  But both Fiat and Abarth’s initial vision of a 500 cc car struggled to achieve the sales volumes that had been anticipated.  Fiat tried two countermeasures – 1) Cutting the price of the basic model and introducing an improved specification, ‘Normale,’ and, 2) Introducing a ‘Sport’ model in mid-’58 which featured a 499 cc engine with similar performance to the Abarth’s, and some cosmetic enhancements including a metal roof.  Abarth went a touch more radical, introducing a new cylinder head with hemispherical combustion chambers and further upping the compression ratio.  Together with attention to gas flow optimisation, 26 bhp was extracted from the little two cylinder.  All good stuff, but the really clever move was to run such upgraded 500s at Monza in February ’58.  They achieved noteworthy speed/distance records which attracted a good deal of press attention.  But, even more significantly, note was taken by Fiat’s top management, leading to a new level of talks with Abarth.  And those talks culminated in the ‘win bonus’ agreement which became so important to Abarth throughout the Sixties – see here. 

Left: Presentation of Fiat 500 Nuova, Turin, July ’57  Courtesy FCA Heritage; Centre: ’57 Fiat 500 Nuova  Courtesy Cymon Taylor/RM Auctions; Right: Fiat Abarth 500, Monza record, February ’58  Courtesy Stellantis

With the Fiat version able do more than just permit its driver to chug around in discomfort, its commerciality was established and customer approval progressively improved.  Through the Sixties it was regularly improved and established itself as a respected model in the Fiat range, even if the 600 was seen as more successful.  It remained in production until ’75, by when 3.7 million had been manufactured.  In the early years of the Sixties, with a model designation, ‘D,’ the car’s doors remained rear hinged.

 

For Abarth, the ‘difficult’ years extended to ’63, when the 595 1st Series was launched that January.  This bigger engine capacity version, along with the 695 which emerged the following year, found much more sales success, largely founded on how well both variants performed in motorsport.  The Fiat 500 engine had been based on a separate cylinders format, but, along with the increase of capacity to 594 cc, Abarth decided to reconfigure it, with the two cast iron barrels conjoined.  Thus there was provision for further enlargement and with potential additional power outputs for better accommodation of higher operating temperatures.  A reprofiled camshaft and upgraded valve springs figured, along with domed pistons, (facilitating a 9.5:1 compression ratio), while internal polishing for enhanced gas flow and a change of carburettor – to the Solex C28 PBJ – all contributed towards a 27 bhp output.  With weight still around 470 Kg, the 595 could do 0-60mph in 28.3 seconds – though not exactly electrifying, that’s half the time it took the original Fiat 500 to do that.  For the period, the 75 mph top speed was considered more than acceptable for such a diminutive car.  As can be seen in the photograph below, being based on the Fiat 500 D, this 595 still featured the ‘suicide’ door rear hinges.

’63 595 #575584  Courtesy Bonhams Cars

One year on, Abarth’s ongoing quest for incremental performance resulted in the announcement of the 695.  This time the capacity increase was to 689 cc, enabling the delivery of 30 bhp.  At the same time, just in case any prospective buyers might think a mere 3 bhp not much of an increase over the 1^st Series 595, further variants, the 595 SS and 695 SS, were presented.  With a higher compression ratio and a bigger Solex carburettor, the 695 SS deployed 38 bhp.  Able to turn 87 mph flat out, it was worthy of its Super Sport designation – confirmed by an ‘esse-esse’ script badge on the engine deck lid.  A ‘64-made 695 SS is seen below, left, with points to note: Lesmo aluminium wheels; engine deck lid badge is ‘SS’ version; Campione del Mondo badge on the rear quarter panel; rear hinged doors.  Below, right, is a ’64 595 SS, which runs on CMR/Borrani steel wheels.  When auctioned in 2023, the lot description stated that the car has been ‘upgraded’ to 695 SS specification.

Left: ’64 695 SS #0866463  Courtesy Peter Bovyn Fotografie; Right ’64/65 595 SS #785002  Courtesy Iconic Auctioneers

During ’65, Fiat introduced a revised 500, known as the ‘F’ model which was equipped with front hinged doors.  Accordingly, from June of that year, there were 2^nd Series versions of the 595, 695 and 695 SS.  The engine power output of all three models was increased by 2 bhp.  The 595 SS 2^nd Series was rated at 32 bhp.

’66 595 2^nd Series

’65 595 2^nd Series, #0862866  Courtesy RM Sotheby’s

Below is a ’67 595 SS, #1399557, with the engine bay and front trunk interiors shown.

’67 595 SS #1399557  Courtesy RM Sotheby’s

In the mid-sixties, Abarth felt a particular challenge to its 4 cylinder 850/1000 Berlina models’ competitiveness in Touring Car racing.  Consideration was given to converting the 200 series engine’s cylinder head to a twin cam format to facilitate further increased power outputs.  Eventually, however, it was decided to meet the objective by redesigning the single cam head’s combustion chambers and valve gear layout.  The result was the ‘Radiale’ head which enabled improved gas flow and combustion thanks to the combustion chamber form and the orientation of the valves.  Each combustion chamber comprised two overlapping hemispheres, the slightly larger encapsulating the inlet valve, the smaller housing the exhaust valve.  As additional measures of unconventionality, each pair of valves was inclined towards one another and were aligned transversely in relation to the cylinder head.  A similar project was approved for the two cylinder unit.  According to Sotheby’s, five 695s were built with Radiale-headed engines.  One of these was offered for sale in 2024 and is shown below.  The auction catalogue refers to this car as ’65-built, something I have not been able to verify and may be a doubtful attribution given that other sources do not date the two cylinder Radiale project prior to ’68, though Alfred Cosentino’s Abarth Guide includes a picture of a Radiale-head engine with a ’67 date attribution!

695 with Radiale head engine  Courtesy RM Sotheby’s

 

The two cylinder version of the Radiale head was a successful project for Abarth’s engines designer Luciano Fochi in terms of meeting the company’s power increase objective.  Its completion was not, however, as swift as Carlo would have desired.  Some of this no doubt stemmed from the difficulty in balancing the new basic elements – valve gear, manifold, twin choke 45 mm Weber carburettor and uprated cooling system – and this demanded prolonged and intensive testing/experimentation.  In consequence, it was not FIA homologated until mid-’71, meaning that the benefits of its availability to the racing programme could not be gained until after Abarth had ceased to exist as a marque in its own right. 

In September ’66 the production version of the 695 SS Berlina Corsa 1st Series made its debut.  The model is often tagged as 695 SS Assetto Corsa, (race trim), but the factory itself did not use the term, though there is sometimes reference to it being a ‘Competizione’ version.  It certainly was a car worthy of track use, with 42 bhp being delivered by the 689 cc engine.  A slightly more powerful 2^nd Series appeared in January ’68. 

Culmination of the development programme came in January ‘70 with the 695 SS Berlina Corsa 3^rd Series, a 45 bhp, 90 mph rocket.  Performance had this time been improved by incorporating a separate cylinder head intake channel for each cylinder   The car was priced at Lit 900,000 at launch.  The example seen below was sold by Bonhams in 2023 for €42,550.  The auction lot description states that 100 of these were made and that around half that number have survived.  It also notes that the car has a modified-in-period engine rated at 48 bhp.

’70 695 SS Berlina Corsa 3^rd Series #2497485  Courtesy Bonhams Cars

On the car in the factory PR image below, the wheelarches (polyester) and lower side areas were finished, distinctively, in red:

Courtesy Registro Fiat Italiano

The 695 SS Berlina Corsa 3^rd Series Tipo 206-A/D engine was fed by a Solex 34 PBIC carburettor and had a 10.5:1 compression ratio.  The car’s weight, at 480 Kg, was only very slightly heavier than the first version of the 695.

The 500, 595 and 695 scored many victories, attracting win bonus payments from Fiat in the years ’60-’71 – a total of 528.  Things began to really pick up in ’64 after the advent of the 595 and 695 models.  An early landmark was Franco Patria’s taking of the Jolly Club Trophy (600 cc class) at Monza in March ’64.  An important win came at the end of that season when a 595 headed the 600 cc class at the Monza Coppa F.I.S.A.  ’65 saw Leo Durst become Italian Touring Car Champion in the 600 cc class driving a 695.  The same feat was achieved in ’66, this time with Raffaele Pinto at the wheel, while Maurizio Zanetti took the 700 cc class in a 695.  Pinto was also victorious at Monza in the Touring class of the F.I.S.A. cup at Monza.  The ’67 Italian Touring Car Champions were again Abarth drivers, Marco Magri (595) in the 600 cc class, and Giovanni Brancadori (695) in the 700 cc class.

The 600 cc class of the Italian Touring Car Championship of ’68 was once again won by an Abarth 595 driver, this time Piergiorgio Poggi.  Expectations for the season were boosted by internal talk about the possibility of a Radiale head for the two cylinder engine, but, as mentioned above, this enhancement would not be homologated until ’71.  In March ’69, Abarth apparently demonstrated ongoing superiority at Vallelunga where 695s were 1-2-3 in the 700 cc class and Raimondo De Sanctis was the 600 cc class winner.  At the end of the season Abarth saw victory in the Touring Trophy once more – Piergiogio Poggi in the 600 cc class and Liberatore Cestra in the 700 cc class. 

The ’70 season opened with Abarth 595 and 695 class wins in the European Touring Car Championship round at Monza, so ‘business as usual.’  That was further confirmed by good performances on the hillclimb courses, where both 595s and 695s remained capable of class victory.  Renato Mazzeschi and Santo Famaso finished the season as Italian Touring Car Champions in their 595 and 695, respectively.  However, as an indication of what was to happen the following year, Abarth set up a new race department away from Corso Marche and under the care of Vincenzo Osella. 

’71, Abarth’s swansong year saw customary hillclimbing success with both 595s and 695s recording wins.  But as the season progressed past the midpoint, the in-house Abarth race operation was wound down and cars/parts/equipment was progressively relocated to the Osella workshop.  In its final guise as the Abarth factory team and as reconstituted at Osella, concentration was on the SE-designation sports racing cars, with a drop-off of focus on the 595/695/850 TC/1000 TC Touring cars.

A few years back I found myself attracted to the current ‘Abarth’ 595 and 695 models.  By today’s standards they are not unnecessarily big, have distinctive styling/a funky interior and a choice of engines offering good performance.  But a test drive soon deterred me, despite the aesthetically pleasing interior, some not over-suppressed exhaust noises and good nimbleness at slower speeds.  The original 595/695 models were designed on a customer centric basis and with a sports enthusiast/race driver in mind.  For such a person now the contemporary versions do not fit the bill.  My biggest concern was about how the seating position/ride height feels – I can best describe my unease in these cars as I sense that I’m sitting on the car rather than within it as you do in those cars where the machine feels as though it’s a seamless extension of your own body.  I have tried another this year, this time with the Sabelt optional seats, and the non-integrated sensation remains.  Performance of the Competizione is good – 0-60 mph in 6.5 seconds, but how much better could it be if the car’s kerb weight was less than its 1170 Kg – the sixties versions weighed in at less than half that!  And the engine that generates the 180 bhp involved is a three cylinder 1.4 turbocharged unit driving through a 5 speed (surely 6 ratios would be expected in a car of this type) gearbox  - a configuration that you know will not be delivering much in the way of really sweet drivability, linear power flow and pleasing noises, (though the Monza exhaust option would be worth having).  So I say that here’s another example of ‘progress’ that takes us backward and that less is more!