Caterpillar C7
The Caterpillar C7 is an inline 6 cylinder, 7.2 litre, heavy duty diesel engine. It sees applications in medium-duty trucks and buses as well as school buses.
The C7 featured CAT Common Rail Fuel System allowing improved injection to help meet 2004 EPA emissions regulations. Fuel economy also increased by up to 4%. The engine also featured a crankcase breather and diesel oxidation catalyst. All these features are part of CAT's Advanced Combustion Emission Reduction Technology (ACERT).
To meet EPA 2007, the C7 was further developed with ACERT. This included Clean Gas Induction (CGI) and a particulate filter with Cat Regeneration System (CRS). The engine also features ADEM 4 electronics and a variable nozzle turbocharger. The C7 uses CAT's common rail fuel injection to help with meeting 2007 emissions and increase fuel economy.
In 2008, Caterpillar has announced that they will not be updating their engines for EPA 2010 certification, and will exit the on-highway engine business entirely. The C7 has been discontinued as of 2010.
Models
Below are engines commonly found in buses.
| Model | Max. Power | Max. revs | Max. Torque | Emmissions Certifications |
|---|---|---|---|---|
| C7 | 210 hp | 2500 rpm | 520 lb-ft | EPA 2004, EPA 2007 |
| C7 | 210 hp | 2500 rpm | 620 lb-ft | EPA 2004, EPA 2007 |
| C7 | 230 hp | 2500 rpm | 560 lb-ft | EPA 2004, EPA 2007 |
| C7 | 230 hp | 2500 rpm | 620 lb-ft | EPA 2004, EPA 2007 |
| C7 | 230 hp | 2400 rpm | 660 lb-ft | EPA 2004, EPA 2007 |
| C7 | 250 hp | 2400 rpm | 660 lb-ft | EPA 2004, EPA 2007 |
| C7 | 250 hp | 2400 rpm | 800 lb-ft | EPA 2004, EPA 2007 |
| C7 | 275 hp | 2400 rpm | 800 lb-ft | EPA 2004, EPA 2007 |
| C7 | 300 hp | 2400 rpm | 860 lb-ft | EPA 2004, EPA 2007 |
Reference
- CAT C9 2004, ohe.cat.com, retrieved on 2009-07-29
- CAT C9 2007, ohe.cat.com, retrieved on 2009-07-29