最先端技術を投入したレーシングエンジンのS20型より、ローテクな大排気量で、乗りやすい実用エンジンのL24型エンジンを搭載したクルマの方がパフォーマンスが高かったというのはちょっと皮肉な話だが、これも日産が2つのタイプのエンジンを持ち、スカイラインGT-RとフェアレディZを同時期に作っていたからこそ分かったこと。
Posted on April 12, 2019 Posted by: "Auto Messe Web Editorial Department" TEXT: Ryuta Fujita PHOTO: Takahiro Masuda
Rare cars on display at the Automobile Council
In the history of domestic cars, there have been two years when performance and quality suddenly jumped. That is 1969, 1989, 20 years later. Speaking of the protagonists in 1969 when the times changed, there were two Nissan Fairlady Z (S30 type) and the first Skyline GT-R (PGC10 type).
The Nissan booth of “AUTOMOBILE COUNCIL 2019” which closed last week will commemorate the 50th anniversary of the birth of both cars. Exhibit Skyline GT-R (reconstructed vehicle) of No. 39 that won the championship. We were able to confirm the origin of the sports car that Nissan is proud of.
Car No. 39 won the first win of the Skyline 49 consecutive wins
Another Skyline GT-R is a car that was born to win the race against Fairlady Z's “Minna no Sports Car”.
The first "Nissan Skyline" (GC10 series), which appeared first after Prince Motors and Nissan merged, is equipped with the Prince racing car R380 DOHC engine and the GR8 detuned version = S20 engine. The name of the GT-R was given as the world's first high-performance sedan for touring car racing equipped with the world's first 4-valve DOHC engine. It is also very interesting that these two units debuted in 1969 from the same manufacturer.
This 39th car won the 1969 JAF Grand Prix, the first GT-R team. This is a restoration of the machine that recorded the first win of Hakoska's 49 consecutive wins (52 wins in total).
The rival is Toyota 1600GT (corona's high-performance version), and in fact this 1600GT also received a top checker with a 1.19 second difference, but it became a penalty of 1 lap subtraction by judging that the runway was obstructed to the final lap, GT- R went up and won. The GT-R ran in the TS class of the undercard, so the handle was entrusted to the clubman driver, not the works driver.
The strength of GT-R is the strongest 2-liter engine with 160 horsepower, the S20 engine itself. In order to suppress twisting of the crankshaft at high revolutions, a side bolt combined system unique to racing engines is adopted. The crankshaft bearing cap is fastened to the cylinder block from the left and right in addition to the bottom. The head bolts were twice as many as the L20 type of the same straight 6 engine.
The carbs consist of 3 Solex (40PHH). There were also Solex 44PHH and Weber (45DCOE) as racing options, and it was a high-tech lever engine at that time (engine unit price = 700,000 yen). Moreover, since it was a typical high-speed engine, I hear that it is refreshing below 4000 rpm.
Although the Toyota 2000GT was a rival, it also raced the Z432 with the same S20 engine in a Fairlady Z S30 chassis; but the 240Z, with the L24 type 2.4 liter straight 6 SOHC engine had more torque making it best.
It is a bit ironic that the performance of the L24 engine, which is a low-tech, large displacement. practical engine, was better than the S20 racing engine, with the latest, and more advanced technology.