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The 20R head has straight ports, so can flow better than the 22R head, improving high RPM power. The 20R head is a simple bolt-on modification for the pre-1985 block, but also requires the use of the 20R intake manifold, making it almost impossible (there's a lot of matching necessary) to use with the 22R-E EFI system. [21]
The ACIS/TVIS System. Acoustic Control Induction System, or ACIS, is an implementation of a variable-length intake manifold system designed by Toyota.. Simply put, the ACIS system uses a single intake air control valve located in the intake to vary the length of the intake tract in order to optimize power and torque, as well as provide better fuel efficiency and reduce intake "roar".
Toyota Variable Induction System, or T-VIS, is a variable intake system designed by Toyota to improve the low-end performance of multi-valve engines. [1]T-VIS is intended to improve the low-end torque of high-performance, four-stroke internal combustion engines - by changing the geometry of the intake manifold according to the engine rotation speed.
In North America, the 20R 2.2-litre engine was used. The high-performance 2000GT Sedan and Hardtop Coupé with 18R-G twin cam engine were only offered in Japan. Yamaha supplied the alloy head for these high performance normally aspirated engines fitted with twin Mikuni-Solex 40 mm side-draft carburettors and a compression ratio of 9.7:1.
Twin downdraft carburetors or Toyota engines manufactured by Daihatsu without VVT-i (e.g., 1KR-DE) E: Multi-point fuel injection: F: Normal cylinder head DOHC: G: Performance cylinder head DOHC H: High compression High pressure charged (e.g., 2L-THE) I: Single-point fuel injection J: Autochoke (early models) or pollution control for commercial ...
2009 Lingenfelter C6 ZR1 at the 2011 Chicago Auto Show. Lingenfelter Performance Engineering (LPE) (also known as Lingenfelter) is an American automotive engineering manufacturer specializing in high-performance automobile modifications, manly and specifically engine blocks, intercooling, transmisson, exhaust pipes, valvetrains, suspension, brakes, pistons, camshafts, and supercharging, Now ...