R100

The Mazda R100 was released in June 1969 and was one of the first Mazda vehicles equipped with the rotary engine. it had been accessible as a motorcar solely, and was supported the 1200 motorcar that had been on sale for over a year. but rather than the 73hp 1200 engine, the engine was a revised 10A like the of the a hundred and ten Cosmo. For Japan and Australia the 10A was rated at around 100hp.

Back within the late 60’s, the term ‘Sleeper’ was still modish. A ‘Sleeper’ may well be delineate as a wolf in sheep’s wear, a machine that looked standard however performed exceptionally. In 1969 Mazda had the most effective example of a Sleeper, it had been the R100. there have been no go-fast stripes. The badge work was restrained. In fact, except a blacked out grille there was just about nothing to counsel any extra dose of sporting character.

The 110S was the automotive that declared Mazda’s presence as associate degree innovative automotive maker. however it had been the limited R100 that translated this into production. The R100 well-tried that Mazda was serious regarding its rotary engine. This wasn’t just a bit of spectacular engineering to be measured into expensive sports cars; rather it had been a real different to the normal ICE.

A quarter mile best was rumored of seventeen.8 at 74mph. it had been in all probability slower than the manufactory time of sixteen.4 attributable to the dearth of familiarity with the rotary’s characteristics. Still this performance was enough to be nervously near the ‘Big Boy’ league. In 1969 a equally size automotive was pushing to crack twenty one seconds. thus inevitably the diminutive R100 found itself being compared with performers just like the Holden Monaro, Ford Capri, courageous Pacer, Ford velum GT, act one hundred twenty five and soon the Holden Torana GTR. The Toyota curl runner and also the mini Cooper S could not get close to the Mazda’s performance and could not be thought-about true rivals.

Out of those cars, the R100 was the smallest amount assumptive outwardly, whereas being one amongst the fastest. It may run to a real 175km/h. The Pacer and GTR may match it’s acceleration however were short on high speed, (about 168km/h in each cases), whereas the act and velum GT were well behind (158 and around 150km/h respectively).

Apart from the performance provided by the rotary engine, the R100 was also superbly built and finished, within the vogue that Australian patrons were getting down to view as granted in Japanese cars.

Alongside a current 323, the R100 would look rather tiny. With it’s overall length of 3830mm. it had been slender too (1480 mm) – not abundant wider, in fact, than it had been tall (1345 mm). give the quality issue skinny 145/SR14 radials on slender rims and also the position clearance of one hundred sixty millimeter and you’ll be able to see why the R100 together with its 1200 siblings managed to own a tip-toe stance whereas standing still.

Overall dynamics were positively the weakest facet of the R100 tho’. MacPherson struts were used at the front in what was already the standard face style. The rear suspension was unsophisticated semi-elliptic (leaf) arrangement. The ride was quite cheap for alittle automotive however there was an inclination to bounce over stormy surfaces with the leaf‑sprung ass at risk of jumping around over bumps inconveniently set within the middle of corners. There was many body roll. Brake wise, there have been discs up front and drums on the rear.

There was a single out of 6500rpm and a cutout on the carburettor’s second barrel at 7000rpm, though abundant higher revs is achieved with a stock engine. Back within the R100 era, the engineers were with reason distressed regarding sturdiness, significantly of the rotor tips and it had been this concern that junction rectifier to the lowish limit.

As for motorsport, Mazda raced its R100 with blind ambition. Mazda was, after all, terribly pleased with its new rotary engine, and in Gregorian calendar month 1969 the manufactory entered 2 R100s within the illustrious Spa-Francorchamps 24-hour, a production-type race wherever several of the world’s makers entered to check product against opposition product. The Spa R100s ran with their Cosmo sort all-aluminum 10A engines. By this stage Mazda’s 10A peripheral ported engines were capable of 200+hp, however the Spa engines were command to around 187hp for endurance reasons. Still the tiny R100s place in {a very} massive performance to complete a very respectable fifth and sixth overall behind manufactory 911s Porsches. For the 1970 Spa-Francorchamps race, associate degree R100 once more came fifth outright. Locally, R100s were tried at Bathurst and some motorcar rounds however did not do fine.

During its a pair of.5 years on sale, the R100 went through additional mechanical changes than the other rotary when it. the most issue behind this was the factory’s unsure direction with its rotary powered  vehicles. The R100 was a epitome vehicle being mass produced; thus, throughout its model run it had been updated frequently as Mazda engineers improved upon the rotary engine. several of those changes affected the R100 mid-model run. nowadays makers typically sit up for ensuing model amendment, for example: the Series I to Series II RX-7.

The R100 is divided into a Series I and II with the date separating them to be regarding middle 1970. The attention-grabbing issue regarding the R100 is that some Series I square measure fitted with Series II components and the other way around. Production uniformity did not extremely begin till the RX-2. it’s additionally typically thought-about Mazda created the R100 solely as associate degree interim model before the RX series started, that was designed to suit a rotary.

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