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Discussion Starter #1 (Edited)
Hello guys,

after luckily getting into possession of a historic 1750 GTAm Monosleeve engine block with crankshaft some time ago, it was clear to me that I wanted to build a historically correct engine out of it.
With very good replica parts such as testa stretta heads, oil pumps, distributors, etc. now available, getting a competitively powered GTAm engine for your project is relatively easy.

However, even after a long search, I have not been able to find any reasonable guillotine parts neither original nor as replica for my project. As the use of carburetors is out of the question for me (Anyone who could ever look into the open bonnet of a genuine GtAm with original injection and airbox, knows for sure what I mean), I decided to start such a replica project myself. Thanks to about 2 years of tireless help from two friendly engineers, the whole thing is now slowly in the final phase with the production of a small series for owners of such vehicles, which also either have no historical injection, or no longer want to trust the original magnesium unit.

As apart from the most original optics, the technical meaning was in the foreground, we tirelessly sorted out technical key datas.

In the end, the following kit was found:

-CAD designed and CNC machined guillotine made of high-strength aluminum which ensures a wear-free and absolutely accurate guidance of the slide

-Fiberglass Airbox in original optics, but with slightly larger volume for maximum suction.

-Historically correct and very compact mechanical Lucas reproduction metering unit with correct adapter for mounting on the front cover of the engine as with the original vehicles
High pressure fuel supply incl all pumps, catch tank, pressure regulators and filters up to the appropriate injectors.

Shortly I will post more pictures of the current status of the project, unfortunately I currently have only some of the beginnings and the first 3d printing prototype and the pump adapter.
 

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Fantastic, congratulations and thank you for spending the time and money to bring back an original GTAm! Please post more pictures of the engine and the car.
 

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That is amazing, well done.
Tell me was this inlet manifold also used for the 4Valve head, If so I would be interested if you are making more.
Cheers Steve
 

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Discussion Starter #7
That is amazing, well done.
Tell me was this inlet manifold also used for the 4Valve head, If so I would be interested if you are making more.
Cheers Steve


Hello Steve, no the guillotine can not be used on any 4-valve autodelta etc alfa heads. The dimensions and fixing points are really different, (but this could be a new project for the future :)
Beside that, the complete fuel system incl metering unit, and the airbox should be the same.

Greets Wolfgang


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Hello Steve, no the guillotine can not be used on any 4-valve autodelta etc alfa heads. The dimensions and fixing points are really different, (but this could be a new project for the future :)
Beside that, the complete fuel system incl metering unit, and the airbox should be the same.

Greets Wolfgang


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The performance options catalog says it's part number 10552.01.060.99 and it fits GTAm, GTA Jr with 8v and 16 v heads.
Also it's mentioned that it fits 33 V8


Basically the same assembly for all fuel injection racing Alfa Romeo 105 series.
 

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Discussion Starter #10 (Edited)


I'm sorry guys, that I have to contradict you. As you can clearly see in the pictures, the 16v guillotine is clearly different. This alone, because the intake duct is expanding because of the doubled number of valves.

Many thanks to Patrick Dasse for allowing me to show pictures from his wonderful book here !!







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nice job! just one comment: the guy who prepped my TS head did try with guillotine too, result was high power yes, but also no nice idle possible, due to tiny air leaks around the slider.
 

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Discussion Starter #15
nice job! just one comment: the guy who prepped my TS head did try with guillotine too, result was high power yes, but also no nice idle possible, due to tiny air leaks around the slider.

Hello Veep, I can understand your objection. How the throttle response will actually be, we will be able to find out as soon as the whole system is running. However, I think that also Autodelta in the development of the 1750 GTAm was the same idea. Although they had a lot of experience and success with the 1600cc carburetor engines, they opted for mechanical injection and also managed to use the system successfully. I personally also think that the myth GTAm lives off much of this unique Testa Stretta / Guillotine execution. For this reason, we have dealt with matter very much before and during development. The decision for example for the Lucas metering unit was not least because the extremely fast Ford Escort BDGs run reliably with this system.
 

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for a all out racing car a bad idle is no problem. I have my doubt though for on the streets, but we will see.
Nice setup if you can smoothen this out.
 

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for a all out racing car a bad idle is no problem. I have my doubt though for on the streets, but we will see.
Nice setup if you can smoothen this out.
As I understand Autodelta fixed this problem as their cars were tested many times in a city traffic by motorsport journalists. They have never mentioned bad idle, but described the smoothness of the engine in a traffic jams
 

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Hello Alfatreter,

Nice work there, we race a GTAm here in Europe, prepared by Formula GT, are you developing this with Peter Praller as he鈥檚 told me that he has clients doing it. Anyway we鈥檇 be interested about the system! You can contact me on tmailliet at mac dot com, I speak german too if that helps!

Tom
 

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Discussion Starter #19
hello Tom, yes you are right, I am a former employee of Peter and have told him about my project for some time. But as so often in real life, a lot of things take longer than expected.
I was certainly not known to be an original fetishist, but it hurts me deeply when I see the often beautiful GTAms with their Testa Strettas but with carburettor system at racing events.
All the more I was confirmed in my plan when I saw live that by far the fastest car in the Italian Alfa Revival Cup with historic injection and guillotine drives. (it seems, even with historic 1750 engine block and monosleeve)
Also the Facetti GTAm was at the last event I was with, an injector and was the second fastest vehicle.
I'll get in touch with you soon by email, then I can tell you more about it.
 
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