Caterpillar C18

1. 42010sJarrett Bay, Scarborough

First on record

Sally GirlScarborough HIN RAV57001J415 · 2015

Latest on record

PrivateerJarrett Bay hull 63 · 2019

The C18 is an in-line six, four-stroke-cycle diesel. Bore is 145 mm, stroke 183 mm, and displacement 18.1 liters.¹

The ACERT version comes turbocharged and aftercooled or twin turbocharged and aftercooled. Cat lists it at 4,000 lb.¹

The C18 spans Cat's whole duty ladder. Its ratings run from an A rating of 460 mhp at 1,800 rpm to E ratings of 1,015 and 1,150 mhp at 2,300 rpm.²

Cat's A rating is unrestricted continuous duty. Its E rating, high performance, allows rated load and rated speed up to 8 percent of the time, at up to a 30 percent load factor.²

For commercial work Cat offered high-performance ratings of 814 to 1,015 mhp at 2,100 to 2,300 rpm.³

Marlin calls the C18 a popular engine for sport-fishing applications, with a range of 1,015 to 1,150 mhp at 2,300 rpm.⁴

The top ratings are high-performance ratings, and Cat's E rating assumes 250 to 1,000 hours of running a year.^1,2

Cat's D rating, intermittent duty, allows rated load and speed up to 16 percent of the time. Cat's 2015 pleasure-craft guide lists the C18's D rating at 814 mhp at 2,100 rpm.^1,2