Cat vs. Cummins

[derlgr]

I'm looking hard for a good used Newmar...have found a 40 footer with a 330HP Cat - but will need to tow about 8,000lbs....my buddies tell me to wait and get the Cummins 350 or 370....thoughts? (its a super deal...saving at least $15K) - derlgr

[tumbleturn]

The difference in the 2 engines is size. The Cat is a 7.2 litter the Cummins is a 8.3 litter engine. The Cat has about 860 lbs of torque and the Cummins has 930lbs of torque if I remember correctly. If you truely have a choice I would go with the cummins. Some rigs the size you mentioned have the 8.9 little cummins motor. If I remember correctly it has a little over 1000lbs pounds of torque.

Mike

[Batman_777]

The Cummins ISC 8.3L produces: 360hp and 1050 torque. Love it!!

[Batman_777]

I have the Cummins ISC 8.3L 360hp, 1050 torque... No Complaints

I heard the Cummins 400 and 425 are throttled back on torque since the Allison will not handle over 1200 anyway. So there's only 50 lbs of torque difference. And......
Side radiators are hydraulic cooled and take up to 70hp away from the 400hp to turn it. Rear Radiators are clutch belt driven and can at times take very little hp away from the motor. So I think the hoop-la over the larger hp motors is a lot of sales marketing to get more $$$.

[Batman_777]

MH 3000 Specification Sheet SPECIFICATIONSMotorhome Rating Gross input power 370 hp (276 kW)Gross input torque 1200 lb-ft (1627 N·m) <<< No matter what motor you have

MH 4000 Specification Sheet SPECIFICATIONSMotorhome Rating Gross input power 525 hp (391 kW)Gross input torque 1650 lb-ft (2237 N·m)