Join Date: Sep 2007
Location: Bussum, The Netherlands
What do we know sofar?
Dear members, so what do we know sofar?
Please bare with me, first of all I am stating the facts that we have verified.
Next are the things that one of our members has offered as information without saying that this info is right or wrong, just that it needs to be verified. If you have anything to add to the facts or the “offered information”, please do so.
Verified facts about the car:
A Giulia Sprint GT with chassisnumber AR 603142 from 1964 carries an Alfa Romeo engine with a “hanging oilfilter”, a 16 valve head with a waterpassage on the exhaust side, single plug ingnition, a Lucas sliding throttle fuel injection with a metal plenum. The bodyshell is a “widebody” version with roll cage without a slittone rear suspension. The car has the single brake booster (for a car with standing pedals).
The Technical Board of the Registro Italiano has reviewed the documentation of this car that was sent to them. It is not known if they inspected the car itself. They gave “approval for the engine only” with nameplate No. 258 in 1987.
This car was offered at auction on the 18th of January 2014 by Coys with an estimate of 110K – 130K Euro’s. The car was sold for 87K Euro’s.
GTV6SA took pictures of the same car when it was in a private collection.
We know that Autodelta had developed a 1500cc “Marine” engine for motorboat racing. It is mentioned in the first edition of “Alleggerita”. Please let someone check the page as I am not able to get to my first edition of “Alleggerita”.
Opinions and things that need verification:
The engine displacement hasn’t been verified. The text of Coys doesn’t mention a displacement, only the figure of 208 BHP. The text on the trunk of the car suggests an engine of 1500cc.
GTV6SA says that the car is one of the two 1500cc 16V Iniezione prototypes that were developed by Autodelta. The exact period during which this engine/car was developed has not been verified by anyone. Coys suggests that the car was developed in period with the Giulia Sprint GTA.
GTV6SA says that Quote “This car will only increase in value due to its rarity especially as its configuration is in original Autodelta trim not "add ons" as mentioned above. This 1.5 litre 16V engine had an output of 196 hp which in a 1600 shell is very powerful for the era.I'm sure people do not realise its true value yet. I"ve know of the existence of this car for more than 20 years and it has been hidden away from the public.” Unquote.
Berlinista asked GTV6SA Quote “Gtv6, could you tell me when it was built at autodelta then? And perhaps shine a light on why they would have picked an obsolete Sprint GT shell instead of a 1750 mk1 , or gta shell? As far as I believe, the 16v head is rather a late development.
Believe me I really like the car, but I find it obscure and strange.” Unquote
GTV6SA further states hat Quote ”16V engines have been used by Autodelta since the 60's. Alec Mildren an Australian Alfa dealer had a stradale 1300GTA 16V built by Autodelta. I suspect that the 1.5 was also developed prior to the F.I.A. changing the class capacity to 1600cc's hence the capacity of this engine. Only personnel involved with the development at Autodelta during this period would know the truth. One of the reasons why they used a steel shell may be because the power ouput was much higher than GTA's of that era being able to handle the increased stresses because some earlier all alloy floored GTA's were showing stress cracks
Later GTA's had steel floor pans.Here in Australia , it is a known fact that the 1300 & 1600 Giulia 105 chassis are lighter than the later 1750 2000 ones” Unquote.
As far as I (Olaf) can verify, the FIA did not change the class capacity from 1500 to 1600cc in the Appendix J for Group 2 during the period from 1961 to 1965 and later. Please let someone verify this.
This is what the text of Coys says:
Quote ”Estimate: €110,000 - €130,000
In 1962, the successor for the very popular Giulietta series was introduced. This car was the Alfa Romeo Giulia, internally called the “Series 105”. The coupé of the 105 series, used the shortened floor pan from the Giulia Berlina and was designed by Bertone.
At the time, Alfa was very active in Motor sport. Autodelta , the racing division of Alfa, developed a car for competition that closely resembled to the road going model. These cars were named GTA instead of GT, the 'A' standing for “Alleggerita”, Italian for lightweight. The GTA was produced first in 1965 as a 1600 (1570 cc) and later as a 1300 Junior version. The GTA auto mobiles were also manufactured in either street (Stradale) or pure race (Corsa) trim.
The GTA had aluminium outer body panels instead of steel, (the inner steel panels were also of thinner gauge, the inner and outer panels were bonded and pop-riveted together), magnesium alloy wheels, clear plastic side windows, an aluminium rear upper control arm, different door handles and quarter window mechanisms, and lightweight interior trim. The engine had a new double ignition cylinder head (called twin plug, later in the eighties the system was called twin spark) cylinder head with a Marelli distributor from a Ferrari Dino, 45mm carburettors instead of 40mm and magnesium camshaft cover, sump, timing cover and bell housing. The transmission gear ratios were closer than standard and the gears were machined for lightness and quicker shifting. In full race form this engine could produce up to 170 hp. The 1600 GTA did not have a brake booster and had a thicker radiator than the standard vehicle. For homologation 500 cars were made for racing and road use.
The car in our auction is a rather special one, it is basically a Giulia Sprint GT but it was heavily modified in period to race specification just as the the forthcoming GTA´s was. It was used as a development car for a very special engine, basically the forthcoming GTAm but with 16 valves and a Lucas injection system.
This engine was very powerful, producing 208 bhp as opposed to the later GTAm´engines that produced 150- 160 bhp. It proved too expensive for Autodelta who did all the development work and who opted for the GTAm s twin spark design instead. This prototype engine was, according to the vendor, later used in a World endurance speed boat record attempts by boat maker Molinari.
A lot of the things tried by Autodelta on this car were put into the GTA and this prototype´s mechanical specifications are similar to that of the quickest race prepared GTA´s, it also has a shorter ratio gearbox. This car is an important part of post-war Alfa Romeo history and is also certified by Registro Alfa Romeo.” Unquote.