i'd go with the cummins isx also; that engine has been around longer & all the bugs have been worked out of it as compared to the paccar mx engine. 350 Cummins – The 350 Cummins and the Big Cam Cummins engines were reliable but not especially good on fuel economy. Or spend the $3000.00 on the extended warranty. They’re so new you pretty much have to go to a Kenworth dealer to get them repaired. Forum > PACCAR MX OR ISX? As far as packaging goes, it’s a very-well designed engine. Some of the engines only have about 15,000 miles on them; others have around 75,000 miles. My drivers really like them. RavenHawk. The drivers are generally happy with the engine. It’s a very technician-friendly engine. In fact, they’re getting the highest MPG numbers for any engine in our fleet right now. The whole process is too cumbersome. The new Cummins X15 will be out soon. We haven’t had to do any serious repair on them yet – just general service and tune-ups. We don’t have a lot of miles on them yet. We have had the usual trouble with emissions equipment, catalysts, ect. They had a bad reputation, but now you can't say that one of the them is much better. The fuel economy on the engines has been good. We have had the usual trouble with emissions equipment, catalysts, ect. :P. PACCAR has gotten better over the last few years. My only complaint so far is that not a lot of people know how to work on them yet. In terms of power, performance and fuel economy, they are great. I work with a company that runs both, and the Paccar's are always in the shop, but the ISX's are all hanging in there, with the older ones going to 18000 houirs without any major issues. And one guy – my best driver – is consistently getting 7.5 MPG. Cummins provides more power to pull. Thank you guys for all of your input. Big Cam Cummins; 1693 Cat – This is one of the best Cat truck engines. And the drivers tell me the PACCAR is the quietest engine of the bunch. Maybe I will just keep my '03 flattop with the 6nz around a little longer! CCJ Magazine covers fleet management topics ranging from technology, freight, logistics, equipment, and more. My ISX has served me well over the last few years. I bought three for starters and since have added six more. You can feel it kick in – but you can’t hear it. I’d like to be able to do the diagnostics in my own shop. Better yett, Build a glider Kit. Maintenance has been very good. Take the MX if it's enough but if you need more than 480hp then the ISX is the only thing out there in a new Pete. But the packaging is good and access to the engine is good. It is the latest engine of the B-series engine family, produced by Cummins. Our KW dealer in NE has treated us very well, but they are 150mi one way, and Peterbilt is 105mi the other. The only problem I know of with the ISX is the EGR valves go out around every year and a half tor them. Torque ratings range from 1,450 to 1,850 lb.-ft. Paccar’s MX13 diesel engine has power ratings from 380 to 500 horsepower. But I’ve had five “undefined” codes on the engine so far. The fuel economy on the engines has been good. PACCAR purely on the grounds that they are the reason we have Kenworth and Peterbilt in the game. Both in terms of filter and component placement and access to major systems. The process takes too long and needs to be streamlined. < > Showing 1-7 of 7 comments . But nothing like the 2008 ISX. Most of them aren’t trained on the engine and don’t even know what they’re looking at. I've checked it out and it is not much more than what I paid for my new KW. You can’t call an outside repair shop. The 6.7L Cummins Engine is developed by one of the fortune 500 companies of the USA i.e., Cummins. I too am hesitant to purchase a new truck with the PACCAR engine (eventhough I'd love … My only complaint so far is that not a lot of people know how to work on them yet. Atleast with the Cummins, I can drop it off and go back to the house. I have zero experience with either of those engines but if forced to pick one it would boil down to HP and torque. I have had them both. Suitability for your application/business. I would have to agree with all of you, especially the fact of the ISX being around longer is an advantage, as well as the fact of the lack of mechanics trained on the Paccar. But it is. In fact, they’re getting the highest MPG numbers for any engine in our fleet right now. They say you can’t hear the turbo spool up and engine brake noise is nonexistent. whichever is not so epa hogtied and will run without issues. We’ve been running the MX13 for 8 months now. So they don’t think the stopping power is as good. Español - Latinoamérica (Spanish - Latin America). Atleast with the Cummins, I can drop it off and go back to the house. I have no way to find out and I can’t always be running the truck by my Kenworth dealer so they can put their PACCAR diagnostic machine on it. Note: This is ONLY to be used to report spam, advertising, and problematic (harassment, fighting, or rude) posts. In terms of power, performance and fuel economy they are great. Really, the only thing I’m nervous at the moment with this engine is breakdowns out in the middle of nowhere. It’s just too complicated. paccar vs cummins engine Which brand is better? But he thinks anything over 62 mph is speeding. Kinda nervous about a buy of this dollar amount and want to avoid any potential mistakes. 380 Cat – This Cat diesel engine was strong, reliable, powerful and got decent fuel mileage. A bit lud, but reliable and lots of power. Thank you in advance. Am going to be purchasing a new flattop 389 Peterbilt, been hearing good about the Paccar MX motor and the Cummins ISX. Both suck hot air and I have driving a K100 with a Detroit engine that had 450 HP and would put bothe of the said engines to shame. Any input would be greatly appreciated as this will be my first new truck after the last five having all been purchased used. Jul 28, 2016 @ 10:27pm whichever is not so epa hogtied and will run without issues. also what u could do is; get u a glider kit with a detroit. Both suck hot air and I have driving a K100 with a Detroit engine that had 450 HP and would put bothe of the said engines to shame. So far we’ve been pleasantly surprised by the engine. Paccar is typically an fuel economy engine. My drivers really like them: We have a fleet mixture of Cummins and Detroit power. But nothing like the 2008 ISX. It is a turbocharged diesel engine introduced in 2007, which is used in RAM trucks. My Kenworth dealer can. But in a lot of cases, the Kenworth dealers still don’t have the diagnostic equipment, either. I too am hesitant to purchase a new truck with the PACCAR engine (eventhough I'd love to try it) based on the location of the dealer. Torque ratings range from 1,450 to 1,850 lb.-ft. It’s also a driver-friendly engine in terms of a pre-trip inspection. They are doing heavy haul in the oilfield and are averaging 6.5 MPG for the fleet. #1. bubbawayne00. And no one can read the engine software. Home Fuel economy is a definite plus. Looking for a little advice. Thanks again for all of the advice. The MX and ISX both use the same aftertreatment system exhaust. Then they look at them and send you a fix. I’d like more information when I get a fault code. I’m hoping PACCAR brings them into the fold and gets them some training soon so I can get a repair if one of my guys does get stuck out in Timbuktu or somewhere. The engine features a compacted graphite iron block, a high pressure common rail fuel system and a 1 million mile B10 design life. fitzgerald out of crossville, tn; cheaper than new epa engines & better fuel economy. What is an “undefined” code? The highest-mileage engine is at 85,000 miles right now. > Our service support has been very good. I'm a yellow guy, so first I'd say niether. All trademarks are property of their respective owners in the US and other countries. And that’s a very aggressive engine brake. Posted by a private BulkLoads.com member. Just hoping you guys might be able to offer some guidance on making my decision. The Ram trucks come in two variants, RAM 2500 & RAM 3500. All rights reserved. that engine is still fairly new on the market & would wait about another 5 yrs before purchasing one of those & then i'd still be hesitant. Paccar’s MX13 diesel engine has power ratings from 380 to 500 horsepower. That goes back to the software that I mentioned. But all of them are routinely in the mid-6s on MPG. You have to download the fault codes and send them in to Paccar. It’s just that the drivers are used to the Cummins brake on the high-displacement engines. For me it makes a difference in the dealer. I would go with the ISX. © Valve Corporation. We ordered new ultra-light KW T660's in 2009 and 2010 with ISM's, Had a 2008 KW T800 ISX. But they’re doing a good job. The only complaint I get from them is about the engine brake. I'd like to try the new PACCAR engine, but I have CAT, Cummins, Detroit here in our small town. I would say check out the International engine. And really, Paccar has a good brake on this engine. The only thing I don’t like about the engine – well, it’s not the engine: It’s the way Paccar handles the fault codes you get off the engine software.

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