Build Of The Week Featuring the most fascinating projects out there: wild engine swaps, show cars, race cars, rare cars, and even meticulously well-preserved regular cars no one else has the guts to love. Send in your build via email to [Stef Schrader](mailto:[email protected]) with “Build of the Week” in the subject line so we can find it. The best cars are the ones that get used. Driven. Hooned. Appreciated as the functional objects that they are. That’s why it’s impossible to look at Luis Millan’s well-loved turbo widebody 1990 Mazda Miata and not smile a little. This is how you do track cars right, and importantly, how to do it on a budget like a boss. Luis acquired his Miata nine years ago for just $1,000 and the trade of an old first-gen GoPro, which definitely set the tone for the rest of his build. It wasn’t his first choice for a race car, but the Miata was the it-car for some of the classes he ran with. Now that the car has … [Read more...] about How to Do a Turbocharged Time Attack Miata on the Cheap
Valve variable timing
Ever since the first internal combustion engine hit top dead centre, engineers have been locked in an inexorable battle with compression ratios. Too low a compression ratio and the engine's efficiency and performance would suffer, too high a compression ratio and catastrophic self-disassembly could occur. Most would, as a result, err on the side of caution and opt for a safe compression ratio that would further allow the engine to tolerate low-quality fuels and poor operating conditions. This, however, often left a lot of untapped potential on the table. When cruising on the motorway at low load, for example, the chance of catastrophic pre-ignition or detonation would be low. Consequently, a high compression ratio would be ideal in this situation - as it would boost efficiency considerably. The opposite was also the case in many instances. A force-fed engine, under lots of boost, would want a comparatively low compression ratio to avoid pistons departing via the exhaust. The wider the … [Read more...] about PH Origins: Variable compression ratio technology
On 2 July, we reported about Yamaha developing the next-generation Yamaha R25 and the Yamaha R3. Now, purported test mules of the new 2019 Yamaha R25 /2019 Yamaha R3 have been spied testing in Indonesia, courtesy of Macantua. It certainly appears that Yamaha could conduct its stage debut this year in the archipelago.As reported earlier, the 2019 Yamaha R25 is likely to feature an R1-inspired design (similar to the Yamaha R15 V3.0), along with possibly a new chassis and tech features. While the updated R25 won’t make it to the Indian shores, the cosmetic/mechanical upgrades will trickle down to the 2019 Yamaha R3, the successor to the model sold in India.Drawing from the spy media, the 2019 Yamaha R25 will feature cosmetic updates, similar to the 2019 Yamaha R15 V3.0, to the fairing with a faux RAM air intake dividing the inward-tilting twin LED headlights. The motorcycle also features new upside-down front forks (likely from Kayaba) with a golden finish. While these upgrades will … [Read more...] about 2019 Yamaha R25/2019 Yamaha R3 spied testing for the first time
Japanese motorcycle scoop generators Young Machine are reporting that the Yamaha YZF-R25 is set for a full model change in 2019. This is important for us because the YZF-R3 we get was derived from that same platform which debuted in 2014. The Yamaha YZF-R3's sales were interrupted by the switch from BSIII to BSIV but the motorcycle returned with ABS at the 2018 Auto Expo. The Yamaha is known to be a sweet-natured motorcycle with its 42PS complemented by great dynamics and manners as well as real street-friendly comfort despite the sporty riding position. And now, let's see what to expect in the new update - the Kawasaki Ninja 400 and the KTM RC390 in India, after all. The new Yamaha YZF-R3 will take after the R15 v3 in getting closer to the design and looks of the current R1 and the more recent new R6 (Image source: YoungMachine) Variable valve actuation Honda took a fairly high-price route for their CBR250RR adding a lot of technology for a motorcycle that plays in this class. But the … [Read more...] about 2019 Yamaha YZF-R3 could feature variable valve timing, USD forks and more!
STANFIELD, ARIZONA — A year ago, I was at the Tochigi Proving Ground, Honda’s test track and R&D facility in Japan, driving a camouflaged prototype of the new Honda Accord. The catch? We were to evaluate the engine and transmission only, filtering out all perceptions of the chassis, interior, and other aspects of the car. Just last week, I was at Nissan’s Arizona Testing Center (ATC) for the same routine with the new 2019 Altima. It might have felt like deja vu if it hadn’t been for the 100-plus-degree heat.Of course, the cars themselves are different, too. Just how different, I’m not authorized to say just yet—check back this fall for more. What I can tell you, however, is that the VC-Turbo engine isn’t the only brilliant four-cylinder Nissan’s building these days.If you’re not familiar already, Nissan’s new VC-Turbo engine is the first series production variable compression ratio combustion engine—ever. It uses a … [Read more...] about Prototype Drive: 2019 Nissan Altima