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+--- Thread: New ISX motor ? (/showthread.php?tid=4470)
New ISX motor ? - RKW1969 - 04-27-2019
If you was going to buy a newer truck what year Cummins would you start with? 2013 or 2014 and up?
RE: New ISX motor ? - Evotrucker - 04-27-2019
cm870 or cm871.
RE: New ISX motor ? - Lonestar10 - 04-27-2019
2008-2011 CM 871 for reliability and longevity and a vast knowledge base how to make it run like a champ on this forum.
So far this year at place im leased on with there is 4 new trucks bought by O/Os all pulling Flatbed.
1 - Bought Dec 2018 - 2019 - 389 - ISX15/18sp manual Performance Series 3.36 Rears - 565HP and gona guess 2050 on TQ - Struggling for 5 MPG vs his 1990s 379 3406 cat he traded in that even at 1.3M virgin Miles was getting 6.5 MPG - Typical Large Car midroof
2 - 2019 - Bought this week and 3 weeks ago - T680 - ISX15/12sp auto Efficiency Series 2.84 Rears - 450/1650 - 1 driver getting about 6.2MPG but complains truck is absolutely gutless in the hills. other driver just bought his this week. Both are the 80 something skyrise sleepers
1 - Bought Oct 2018 - 2019 - Cascadia - DD15/DT12 Auto Unknown gearing probably 2.something - 500HP/ dont know DDs torque ratings - Getting 7.5-8MPG all day long with good power in hills says he drives it like he stole it. Midroof
so looking at that 140-170k for a new truck would only be worth it to buy the 19' Cascadia specs running Flatbed with no Tuning/Modifications from what ive heard this year from people i know.
my Lonestar CM871 3.36 rears 500/1850 is doing about 5MPG running 65-67 mostly and 60-62 when i have plenty of extra time nets me about .5MPG its not perfect and i think i have some issues hiding somewhere because even empty my mileage doesnt go up really. but i have 40k in my purchase with 1/4 of their payments so when i want to i can park it in a corner and disapear on vacation for a week or a month and not be out a whole weeks earnings in payments + vacation cost.
RE: New ISX motor ? - SquareOne - 04-27-2019
(04-27-2019 )Evotrucker Wrote: cm870 or cm871.
^^ ...This...
- Although I ended up purchasing a cm2350, it seems like the 22/2350's are plagued with the infamous High Press Fuel Pump issue. Even staying on top of them doesn't guarantee the inevitable failure which can take out the engine. I had heard that the X-15 HPFP had a better design than the previous 2 generations, but with that amount of fuel pressure, components are still very likely to cause catastrophic failure.
- Do yourself a favor and research and truly understand the most common problems of whichever engine model you lean towards BEFORE making the purchase. That way you'll be prepared when the $hit hits the fan.
RE: New ISX motor ? - RKW1969 - 04-27-2019
I think I’ve kinds narrowed my looking down to 2014 and newer with the Cummins. I see a lot of good buys with the 2250 and 2350 but the fuel pump scares me. All the 870 and 871 around me are high mile oilfield trucks. Was talking to a o/o crude hauler for the company I’m hiring on with. He advised to buy as much newer truck as possible to keep the down time to a minimum. It’s all a gamble either way lol.
RE: New ISX motor ? - Rawze - 04-27-2019
have not seen anything newer beat this prostar w CM871 with its 8.3 mpg/Million mile average to the pump yet. when i do, I will consider buying something newer.
I know of at least a dozen others that have the same (or very similar) setup making the same profitability and good high fuel mileage as I am with mine. What we do is very repeatable.
Biggest trouble I see these days is those tall damn rears. Anything taller than about 3.55's is a waste of fuel and nothing but torture on the engine once you have a loaded trailer.
RE: New ISX motor ? - rockinrandall - 04-27-2019
bought new 2019 t800 x15 in nov 2018 have 50 thousand miles on it now run same route every day getting 6.2 pulling fancy gap in va at 82 thousand 565hp 2050 torque
RE: New ISX motor ? - rockinrandall - 04-27-2019
would like to hear what others with this motor are doing
RE: New ISX motor ? - RKW1969 - 04-27-2019
Hey Rawze, I’m taking your advice and I rule out anything higher than 3.55. I’ve found a few with 3.70 and 3.90 that I’m looking into.