HP question on a Cummins 8.3
So our DP sold and we are shopping for our "upgrade". Engine size is one of the things we want to improve. I see the following in an ad: "THE 8.3 LITER CUMMINS 360 HP ENGINE HAS BEEN RE-RATED TO ...
Forum Discussion
JetAonly wrote:
FWIW we have an 350 HP 8.3 in our Dynasty. We weigh 33k down the road. Without towed my 20k mpg was~8.3 with a 1500 Silverado 4x4 and 500 lb motorcycle in the bed over 10k mile we averaged 7.2. Plenty of HP with out towed. With towed it is adequate. Over Eisenhower tunnel at 11k ft we were about 30 mph. We are about 39k with towed.
The 8.3 was offered in versions to 380 HP from the factory. The transmission is the limiter on most of the 8.3 drive trains. We have the Allison 3066 which is rated to 350 HP and 1050 TQ. The ISL is an 8.3 block with a bigger stroke. It is also a fine engine. The ISL has some years with a bad wrist pin. There is a list of ESN's on this site.o
On my Revolution at around a CGW of 34,000lbs I've average 7.8 mpg in the 14,000 miles I've driven it, all in the western states. It will pull a 6% grade, like the Grapevine north of Los Angeles at +/-45mph and that's without the pedal massed to the metal. I usually back off just a little from full power when pulling a grade, I typically set the cruz for around 57mph.
