Car Tuning Car Trivia 3 — Questions and Answers
Question 1: What does 'port and polish' mean when applied to cylinder head modification?
- Smoothing and reshaping intake/exhaust ports to improve airflow (Correct answer)
- Adding extra valve ports to increase cylinder count
- Polishing the combustion chamber surface to reflect heat
- Installing stainless steel port liners for durability
Correct answer: Smoothing and reshaping intake/exhaust ports to improve airflow
Port and polish is the process of grinding and smoothing the intake and exhaust ports in a cylinder head to remove casting imperfections and improve airflow efficiency.
Question 2: What is the purpose of an anti-roll bar (sway bar) upgrade in suspension tuning?
- To reduce body roll during cornering and improve handling (Correct answer)
- To stiffen the chassis against torsional flex
- To lower the vehicle's center of gravity
- To increase suspension travel for better road holding
Correct answer: To reduce body roll during cornering and improve handling
An upgraded anti-roll bar connects opposite wheels and resists the twisting force during cornering, reducing body roll and keeping more tire contact with the road.
Question 3: In forced induction tuning, what is 'intercooler efficiency' measured by?
- How well the intercooler reduces compressed air temperature relative to ambient temperature (Correct answer)
- The flow rate of air through the intercooler core in CFM
- The boost pressure drop across the intercooler
- The ratio of intercooler volume to engine displacement
Correct answer: How well the intercooler reduces compressed air temperature relative to ambient temperature
Intercooler efficiency is the percentage of heat removed from the compressed charge air, comparing inlet temperature to ambient temperature and actual outlet temperature.
Question 4: What is the stock redline RPM of a stock Honda S2000 AP1 engine (F20C)?
- 7,500 RPM
- 8,000 RPM
- 8,900 RPM
- 9,000 RPM (Correct answer)
Correct answer: 9,000 RPM
The Honda F20C in the AP1 S2000 redlines at 9,000 RPM, making it one of the highest-revving naturally aspirated production car engines ever built.
Question 5: What is a 'tune' or 'ECU tune' primarily used to modify in a performance vehicle?
- Fuel maps, ignition timing, and boost control parameters (Correct answer)
- Physical engine components like camshafts and pistons
- Suspension geometry and damper settings
- Brake bias and ABS intervention thresholds
Correct answer: Fuel maps, ignition timing, and boost control parameters
An ECU tune reprograms the engine control unit's fuel injection, ignition timing, boost targets, and other engine management parameters to optimize performance for modified hardware.
Question 6: Which racing series is most closely associated with the development of aerodynamic ground effects in car design?
- Formula 1 in the late 1970s (Correct answer)
- NASCAR Cup Series in the 1980s
- IMSA GTP in the 1990s
- WRC in the 2000s
Correct answer: Formula 1 in the late 1970s
Formula 1 teams like Lotus pioneered ground effect aerodynamics in the late 1970s using venturi-shaped underbodies to generate massive downforce without increasing drag.
Question 7: What does the abbreviation 'DOHC' stand for in engine terminology?
- Dual Overhead Camshaft (Correct answer)
- Direct Overhead Combustion Head
- Dynamic Output High Compression
- Dual Output Horsepower Controller
Correct answer: Dual Overhead Camshaft
DOHC stands for Dual Overhead Camshaft, meaning two camshafts sit above the cylinder head — one operating intake valves and one operating exhaust valves.
Car Tuning Car Trivia 3
What does 'port and polish' mean when applied to cylinder head modification?