Why does the old Jetta have small displacement but strong power?
3 Answers
The old Jetta uses a diesel engine, which has the advantage of small displacement but strong power. In terms of power and torque: Diesel engines focus more on vehicle torque, with relatively long cylinder strokes, which can reduce engine speed and better amplify torque. In terms of fuel: Diesel engines have a thermal efficiency conversion rate of at least 35% or higher. Manufacturing costs: The cylinder block and cylinder head of diesel engines are thicker and more robust, with stronger pressure resistance. Components such as pistons, connecting rods, and valves inside the cylinder require higher strength for support, resulting in slightly higher manufacturing costs.
I've studied the phenomenon of the old Jetta's small displacement yet fierce power output. The key lies in its extremely aggressive engine tuning. That 1.6L engine was specifically optimized for high RPMs, with a redline exceeding 6000 rpm, and peak torque output around 4500 rpm - much more willing to rev than its contemporaries. The body structure also contributed significantly, using robust steel yet maintaining overall weight around 1 ton for excellent power-to-weight ratio, giving that immediate surge when accelerating. The manual transmission's well-matched gear ratios, particularly the large first and second gear ratios that amplified torque, made urban overtaking exceptionally responsive. Plus, without today's electronic systems creating parasitic losses, with minimal mechanical resistance and direct power delivery, it naturally felt more spirited to drive.
After driving an old Jetta for over a decade, this car's power delivery feels nothing like a small 1.6L engine. Revving high with the manual transmission is particularly exhilarating - stomping the throttle in second gear makes the engine roar, and the acceleration pushes you right back into the seat. The key is its light weight, tipping the scales at just 1.1 tons empty, making the 75kW engine more than adequate. With its rigid body structure and firm suspension tuning, the power delivery feels direct and immediate. Back when driving on national highways, passing trucks required just a quick stab of the throttle - it responded faster than many of today's 1.5T turbocharged cars. The narrow tires with lower friction actually reduced power loss, and the low driving position with excellent visibility created a perfect man-machine connection that made the power feel even more impressive.
