Quem inventou o sistema de comando variável de válvulas?
Sempre pensei que tivesse sido a Honda mas, graças á minha santa ignorância no que toca a motores, resolvi ir investigar.
É que a minha experiência com carros tem mais a ver com chapa que outra coisa. Passei longos verões na oficina do meu pai, bate-chapa desde os 14 anos.
Artigo, sei lá de onde:
"It's a little known fact that Nissan actually beat Honda to the market with a variable valve timing system. Their NVCS (Nissan Valve-Timing Control System) dates back to 1986 and was used first in the VG30DE 3.0L 24-valve V-6 and I believe the RB20DE (Skyline) engines. By 1990 it was in many of their vehicles including the VH45DE (Q45) and also a 1.6L 4-cyl but I'm not sure of the engine code or car. It was also used in the 92-94SE Maxima with the VE30DE engine. Honda was just starting to deploy VTEC while Nissan's NVCS was already in widespread use throughout the company.
Example of NVCS Operation, 1990 Nissan 300ZX TT
Paraphrasing from SAE documentation I have on the VG30DETT engine from the 300ZX TT, here is how the NVCS system worked.
NVCS ON
Intake Valve Open: 19 BTDC
Intake Valve Close: 49 ABDC
Exhaust Valve Open: 59 BBDC
Exhaust Valve Close: 9 ATDC
NVCS OFF
Intake Valve Open: -1 BTDC (1 ATDC)
Intake Valve Close: 69 ABDC
Exhaust Valve Open: 59 BBDC
Exhaust Valve Close: 9 ATDC
Tumbaaaaa!!!