Community Forums

TheArnolds · 07-17-2012, 12:04 PM

I am new to the DP world and I have been reading with much interest however I do have a question to help me understand a little better.

I read here that the ISB, 6.7L has 340 HP. I have a ISB, 6.7L that is rated at 300HP @ 2600 RPM / 660 lb*ft @ 1600 RPM. How can two ISB 6.7L engines have different HP ratings? Is there something different/added to the one that is rated at 40 HP more?

vito.a · 07-17-2012, 04:42 PM

Yes, Cummins (as well as other diesel engine manufacturers) market several different versions of the same series engine. The differences are in the fuel delivery and amount of turbo boost. Sometimes, a lower HP engine can be bumped up with only a software update. Other times it is expensive as it takes an entire new fuel system or larger turbo.

jponyboyace · 07-22-2012, 02:54 AM

wow good engine we agree

oldbeek · 07-22-2012, 12:28 PM

If you want to hotrod it to 400 hp, go to dieselgarage .com. Caution, you may stretch your head bolts doing so and need to add after market studs.

topdownman · 07-24-2012, 06:37 AM

I certainly pray that the Cummins ISB is a good engine. I have the 300HP version and am very happy. I haven't noticed a lack of power, but I haven't driven a 400HP motorhome either

.

When I picked up my motorhome yesterday from the diesel shop having the brakes repaired, the owner told me to thank my lucky stars I didn't own a Caterpillar. When I asked him what he meant, he said the Cummins was MUCH easier to work on and less problems. If you have a problem with your Caterpillar, he said to "get out the big checkbook".

My BIGGEST fear with a DP motorhome, is some sort of catastrophic engine failure that's going to cost big bucks.

deSanford · 07-25-2012, 07:23 AM

Two weeks ago when I was at Coburg, Or. I met a fellow with a 4X4 Dodge with a modified Cummins ISB275 5.9L who showed me the miles he had on his truck speedometer. I looked twice and saw 760,000 miles and he said " I just change the oil once a year". The manual transmission was another story........he is on his 3rd. He pulled a large car transport. It was a dully with a crew cab. I have a diesel Isuzu 1985 that is still going and my mechanic said the engine will keep going as the body falls apart (rusts). deSanford