1. Unit 6
Performance Unit

2. What does it mean? Where did it come from?
Horse Power
What does it mean?
Where did it come from?

3. Horse Power
The term horsepower was invented by the engineer James Watt. Watt lived from 1736 to 1819 and is most famous for his work on improving the performance of stream engines. We are also reminded of him every day when we talk about 60-watt bulb.

4. Dynamometer
You can easily convert torque to horsepower by multiplying torque by rpm/5,252
A dynamometer places a load on the engine and measures the amount of power that the engine can produce against the load.

5. horsepower divided by the weight
Power-to-Weight
horsepower divided by the weight
Bugatti Super Sport $2.4m
Hell Cat $70,000
Mr. E’s Evo
850
2700
.315
Fast
$30,000
Caparo T1
575
1040
.553
2.3
$300,000

6. Volumetric Efficiency
Volumetric Efficiency is a ratio (or percentage) of the quantity of air that is trapped by the cylinder during induction over the swept volume of the cylinder under static conditions. Volumetric Efficiency can be improved in a number of ways, most effectively this can be achieved by compressing the induction charge (forced induction) 

10. 2.0L 4G63T vs L - LS7
505hp
286hp
Every 14.7 psi over atmospheric pressure doubles an engines volumetric efficiency.

11. Superchargers
Force air under pressure into the combustion chamber (higher than atmospheric pressure) More air means more fuel can be added. This process is called

12. Roots Type Supercharger
PROS
CONS
Cheap
Parasitic Drag
Quick Low end power
Extensive heat (rubbing)
TBD / Carb mount above
Higher weight

13. Centrifugal Supercharger
PROS
CONS
Small / Compact
Low RPM boost
Freedom of placement
Engine Oil Required to cool
Thermal Efficiency
Parasitic load

17. Stock piston and rods can only handle so much
Engine Internals
Stock piston and rods can only handle so much
Forged Connecting Rod
Once the engines power level reaches a certain point, it must be rebuilt using forged internals!