Neverending Chain, now closed!

[Paul Jaray]

354 matches...and still counting! 

[Ehhxekt]

Reyonnah and 1911 Sirron 10/14 HP. Both cars have a name that is a heteropalindrome: the last name of the person behind the project – Robert Hannoyer and H G Norris, respectively – spelled backwards.

[Wendax]

Sirron 10/14 HP and Belsize 10/12 HP, as both cars have the same engine displacement of 1944 cc.

[Paul Jaray]

Time to close this chain?

[Ehhxekt]

Please don't do that! If you can accept a link that connects the manufacturers only, and not the actual cars themselves, I think I have a suggestion to make it go on:
Belsize 10/12 and Hotchkiss 617 Roadster-Cabriolet. During their last years both companies made an unexpected move, introducing a line of new and, at least for their standards, rather unorthodox cars, designed by, and also named after, a well-known and innovative engineer of their respective country (Granville Bradshaw → Belsize-Bradshaw, 1921-25; Jean-Albert Grégoire → Hotchkiss Grégoire, 1950-53).

[Paul Jaray]

Very good! 

[barrett]

There are too many matches already to check, but I hope we haven't had this.
Hotchkiss 617 and 1937 BSA Scout. both cars were made by companies that began as arms manufacturers before they built cars

[Paul Jaray]

There are too many matches already to check, but I hope we haven't had this.
Hotchkiss 617 and 1937 BSA Scout. both cars were made by companies that began as arms manufacturers before they built cars

Don't worry, I'll take care of that.
We had this:

Hotchkiss Anjou 13/50 1952 and BSA Scout   both manufacturers have a badge featuring firearms

but yours is different. 

[Wendax]

BSA Scout and BEF Lieferdreirad : both companies names are abbreviations that carry the name of the city where they built their cars. BSA = Birmingham Small Arms, BEF = Berliner Elektromobilfabrik.

[Paul Jaray]

Very good!
Who's next?

[75america]

BEF Lieferdreirad and Maserati Quattroporte,  both model names describe exactly what it is.

A 3 wheeled delivery car and a 4-door.

[Wendax]

Maserati Quattroporte and Toyota Corolla, because their manufacturers are using the model name for more than 30 years.

[Ehhxekt]

Toyota Corolla and Lincoln Lido. Both cars have a model name that echoes the vowels of the marque name.

[Paul Jaray]

 

[Wendax]

Lincoln Lido and Marcos Mantis, because make and model share the first two letters.

[yves]

Marcos Mantis and Amilcar CC
Both makes' names were a combination of the founders' names

[Wendax]

Amilcar CC and NSU TT, both model names consist only of a doubled consonant.

[Ehhxekt]

NSU TT and AJS Nine Saloon; both cars were produced by a manufacturer whose motorcycles had earlier scored a 1-2-3-4 victory at the same event.

In the 1954 Tourist Trophy on the Isle of Man NSU took the first four places in the 250 cc division; the same feat was performed by AJS thirty-three years earlier in the Junior class.

[Wendax]

AJS Nine Saloon and Opel Kadett Lieferwagen, because both companies built vehicles named Admiral and Commodore. AJS built buses with that model designation, Opel upper-class cars.

[Ehhxekt]

Opel Kadett Lieferwagen and Triumph Vitesse Estate. Both model names were introduced and, after an interval of more than two decades , re-introduced, the same year.

Both Kadett and Vitesse names had previously been used by the manufacturers on a pre-war model, introduced in 1936: Opel released Kadett in December that year, Triumph's new Vitesse Saloon was presented at the Paris Motor Show two months earlier. Both models were soon discontinued, with no post-war successor to carry the name until 1962, when the Kadett A and the six-cylinder Vitesse were unveiled.

[Wendax]

Triumph Vitesse Estate and Rolls-Royce Silver Cloud III Continental Drophead coupe, because they both have a "Chinese eyes" headlight configuration.

[Djetset]

The Rolls-Royce Mulliner Park Ward Silver Cloud / Continental and the Saab 9-5.

Both vehicles were styled by Norwegian car designers;

Wilhelm Koren designed the Rolls-Royce/ Bentley

Einar Hareide designed the Saab 9-5

[Wendax]

Saab 9-5 and Rumpler Tropfenwagen, because both companies built airplanes as well.

[Ehhxekt]

Rumpler Tropfenwagen and Alfa Romeo P33 Cuneo. Both model names refer to the shape of the body.

[Paul Jaray]

So far so good!