Marcel: Not realizing what an efficientMarcel said:Variable Timing +
In 1992, the 4AGE 1600 received VVT (Variable Cam Timing), individual throttle bodies, and an extra Valve > 4AGE 20V! It produced 160 HP, the equivalent of 10 HP for every 100cc- racing engine output comparable to the early days of Twin Cams! By 1997, the JZ six cylinder models and the 3SGE Beams gained VVT heads too.
In it?s final reiteration the 3SGE gained Dual VVTi head and remains in production for the Altezza. The 3SGTE never had the VVTi head, but internal upgrades and different turbos allowed it to produce 260 HP.
The 2ZZGE 1800 is the newest and maybe LAST G series Twin Cam engine. The use of aluminum blocks is also a first for a Toyota performance engine. Up-graded features include variable timing and variable lift, and tuned intake manifold.
The Yamaha connection needs to be mentioned: Yamaha developed the Toyota 2000GT and was a Toyota partner in the design of most Type G heads. Most engines/heads, including the 3SGE/3SGTE (now in it's 4th generation), the Previa specific 2TZFE/Z (no relation to the old T engines), and the newest 2ZZGE engines were and are still designed and cast by Yamaha. Yamaha also assembles most of the Toyota G model engines.
(The 4AGE and 2JZGE heads are proprietary Toyota designs and manufacture, although many components are still made and supplied by Yamaha).
The classic Twin Cam design has worked very well for Toyota and has powered all milestone Toyota performance models. The current generation multi-valve / variable cam timing G Type Twin Cam 2JZGE, 3SGE, 2ZZGE engines showcase the ultimate evolution of Toyota performance engines; and the F Type engines, for the rest of Toyota?s fleet, powers the Scion and Lexus models too.
No other manufacturer can claim over-all superiority on production based Twin Cam engines. Although other manufacturers exploit the benefits of Twin Cam technology further, the Toyota engine has proven more durable bar none.
The Toyota Twin Cam engines has been produced in more variations: 1000cc to 5700cc; 2 or 4 or 5 valves per cylinder; normally-aspirated, turbocharged, and supercharged.
Future Hybrid Twin Cam
Toyota Twin Cam engines will remain in the forefront of Toyota technology. With all current Toyota engines featuring Twin Cam head configurations of either Type F or G variety, it is assured that a Toyota Twin Cam will continue to power future Toyotas. The Prius 1NZFXE 1500cc proved Twin Cam compatibility for Hybrid applications. The new 3MZFE 3300cc has already been combined with Dual electric motors in engineering studies. ?Electric Supercharger? is the operative term for the future.
engine maker Yamaha is, when I first
reported that the Elise had a Yamaha
engine (it's even stamped on the
block in bold letters), some people
thought it was a 'minus' feature of the
car. Anyone who has done in-depth
research, as you have, knows it is a