8 Wesley Green Dakota Honeycutt2/4/16Project 3A. B.Equations:

1 Liter SI:

SPEEDENGINEBMEPPOWERBSFCFuel RateFuel Consumed

MPHRPMkPakWg/kW*hgrams/hourgrams/mile

0000.00

10500

201000220110360396001980

301500300225320720002400

4020004004002851140002850

5025005006252751718753437.5

6030006009002902610004350

70350070012253304042505775

75375080015003355025006700

804000

904500

954750

1005000

2 Liter SI:

SPEEDENGINEBMEPPOWERBSFCFuel RateFuel Consumed

MPHRPMkPakWg/kW*hgrams/hourgrams/mile

0000.00

10500

201000110110520572002860

301500150225365821252737.5

4020002004003651460003650

5025002506253402125004250

6030003009003202880004800

70350035012253053736255337.5

75375040015003034545006060

80400045018003055490006862.5

90450055024753358291259212.5

954750600285034096900010200

1005000700

1 Liter CI:

SPEEDENGINEBMEPPOWERBSFCFuel RateFuel Consumed

MPHRPMkPakWg/kW*hgrams/hourgrams/mile

0000.00

10500

201000220110410451002255

301500300225340765002550

4020004004003001200003000

5025005006252801750003500

6030006009002502250003750

70350070012252603185004550

75375080015002804200005600

804000

904500

954750

1005000

2 Liter CI:

SPEEDENGINEBMEPPOWERBSFCFuel RateFuel Consumed

MPHRPMkPakWg/kW*hgrams/hourgrams/mile

0000.00

10500

201000110110810891004455

3015001502255201170003900

4020002004004201680004200

5025002506253902437504875

6030003009003403060005100

70350035012253203920005600

75375040015003154725006300

80400045018003105580006975

90450060027003108370009300

954750650308831597256310238

1005000

C.

The 1 liter CI engine delivers the best fuel consumption vs mph. The 1 liter SI engine delivers the best fuel consumption vs mph at lower RPM, but the 2 liter delivers better at higher RPM. The SI engine is better at lower mph, but the CI engine is better at higher mph. This makes sense because a typical car with a CI engine gets better fuel economy on the highway than an equivalent SI engine.D. 2 Liter CI w/ Overdrive

SPEEDENGINEBMEPPOWERBSFCFuel RateFuel Consumed

MPHRPMkPakWg/kW*hgrams/hourgrams/mile

00

20500

4010004404403101364003410

6015006009002752475004125

80200077516002804480005600

100250082525002807000007000

1203000850360028010080008400

1403500825490028013720009800

16040007507200300216000013500

18045007009900320316800017600

190475065011400320364800019200

The engine containing the overdrive gear came out to have a lower fuel consumption for any given speed. This means they have a better fuel economy and are more efficient than those without overdrive. E. Yes, because the higher gear ratio has a higher BMEP for a given RPM which means it produces more power at that RPM. This means that the overdrive has lower fuel rate and consumption.G. At 3000 RPM the available BMEP to the CI engines is 850 kPa. The 1 and 2 liter engines use 600 and 300 kPa respectively. This means they use 70 and 35 percent of the total. The significance of this is that it shows how much of the engine performance is lost due to friction in the drive train and the load of the road being added to the engine.