Mazda's Chuang chi blue sky engine, is the peak of the self-priming engine, do not accept the rebuttal, if you say that mazda compression ratio is only 13, Nissan can do 14, why is Mazda blown into the sky? To be able to say such a thing proves that you have a certain tendency in yourself, and you need to know these three points.
1, Mazda's Chuangchi Blue Sky engine, the compression ratio in foreign countries is also 14 to 1, but in China because of the oil products adjusted the compression ratio.
2, Mazda's current use of the first generation of Chuang chi blue sky engine, but launched in 2010, and Nissan's variable compression ratio engine, is launched in 2018, 8 years late Nissan is a latecomer advantage. The new generation of Mazda Chuangchi Blue Sky engine can achieve a compression ratio of 18 to 1.
3, Nissan's VC-TURBO came out, but there was no less propaganda, what revolutionary black technology, 20 years of grinding a sword, the soft text at that time was also overwhelming.
The compression ratio of both engines is variable
In fact, these two engines are very good engines, the compression is relatively high, compared to the EA211 \ EA888 and other compression ratios are generally near 10 to 1 engines, it does perform better in fuel economy and technological advancement.
These two engines have some commonalities, in addition to the relatively high compression ratio, the compression ratio of these two engines is not static, can achieve the result of variable compression ratio, but nissan VC-TURBO engine compression ratio variable range is a little wider.
Mazda's Chuangchi Blue Sky engine can achieve an ultra-high compression ratio of 14:1 (adjusted to 13:1 in China), but this is under high load conditions, using the Alto cycle, and under low load conditions, it uses the Miller cycle, the compression ratio is 11 to 1, the Miller cycle is inferior to the Otto cycle in terms of low torque output and high speed explosive force, but the fuel economy is better. And all this is through the motor to control the valve phase, that is, electronic control to change the compression ratio.
Nissan's VC-TURBO engine, the compression ratio can be switched between 8:1.0 and 14:1, when the engine is running at a high load, the compression ratio will be as low as 8 to 1, and when the engine is running at a low load, the compression ratio will be increased to 14 to 1. Nissan added a diamond-shaped L linkage between the piston and the control shaft, as well as the drive and A linkage. Continuously changes the upper stop point of the piston, thereby changing the compression ratio
Comparison of the two engine technologies
In terms of technological advancement, Nissan's VC-TURBO is definitely stronger, after all, there is a certain latecomer advantage, compared to Mazda's two compression ratio switches, Nissan's engine can intelligently select the best compression ratio between 14:1 and 8:1. In addition to switching the compression ratio, both engines have some technical highlights.
For example, Mazda's 4-2-1 exhaust manifold, extending the distance between the exhaust ends, inhibiting the generation of knocks, coupled with low-tension piston rings, lightweight pistons/connecting rods/crankshafts, low-friction coatings on the piston skirts, deep pit convex pistons, 6-hole multi-angle nozzles, variable displacement oil pumps, etc., if placed 10 years ago, are very cutting-edge technology, even if it is not outdated now, it can be seen that Mazda is really serious about studying the engine of the car companies.
Nissan's VC-TURBO, in addition to the variable compression ratio, also has a dual injection system, variable capacity oil pump, wide range turbocharger and intake and exhaust VVT, of which the dual injection system is a more cutting-edge technology, in general, because there is a certain latecomer advantage, Nissan's VC-TURBO absolute technological advancement is stronger. But its opponent should not be Mazda's first generation of Chuang chi blue sky, but the second generation of compression combustion engines.
In any case, the two engines are relatively excellent engines, fuel economy is relatively excellent, there is no need to hold one step on one, considering their price, positioning and launch time, Mazda's Chuang chi blue sky is actually not lost.