Cummins X15, what's the word?

[MXinIT68]

Been looking for a new truck, and because of the popularity of the Volvo and Freightliner products with their corporate engines ( sold out ), there are some units out there with X15 still available. Ive had bad experiences with anything ISX powered and knowing that the only way this engine lives is because of this site, would the X15 be a good alternative?
What are the weaknesses?

Thanks for any and all input in advance.

[Rawze]

Best version of the ISX is the CM871. The X15 has no gains on it and costs more to operate long term. They did however somewhat fix the problem with the fuel pump destroying the entire engine when it fails, that is its only advantage over the previous models CM2250 and CM2350-X101.

It is still up in the air about longevity vs the ridiculously high compression ratio to meet the new emissions though. Only time will tell that one.

[Hetdiesel]

(07-24-2018 )Rawze Wrote:  Best version of the ISX is the CM871. The X15 has no gains on it and costs more to operate long term. They did however somewhat fix the problem with the fuel pump destroying the entire engine when it fails, that is its only advantage over the previous models CM2250 and CM2350-X101.

It is still up in the air about longevity vs the ridiculously high compression ratio to meet the new emissions though. Only time will tell that one.

Rawze has anyone tried lowering this compression yet? I only ask because cat guys do that to convert back from the acert engine ?

[Rawze]

(07-24-2018 )Hetdiesel Wrote:  [quote='Rawze' pid='28855' dateline='1532484775']
...

Rawze has anyone tried lowering this compression yet? I only ask because cat guys do that to convert back from the acert engine ?

- Might be able to but it is going to likely cost $20,000+. Then there is still the second problem of the injectors spraying at the wrong angle (The new injectors spray almost completely horizontally). Add in costs for lower angle injectors without cores, etc. and you would be better off just getting an 871 to drop in it. There certainly would be no cost benefit vs increased longevity to doing such a thing any ways.

Just some thoughts, nothing more.

[smorgan87]

Are they even demandatable with such high compression?

[Brock]

I'll be finding out shortly, ordering a new tri drive with a x15 600 in it.

Talking to the oilfield guys out here, they seem to love them so far...... But they are very new yet. I do know they pull like a raped ape.

[Rawze]

(07-25-2018 )smorgan87 Wrote:  Are they even demandatable with such high compression?

Yes, very doable. The higher the compression ratio, simply less boost is required combined with a longer burn length in the cylinders. Unilevers has done a few I think already.

I know I could compensate for such things fairly easily, but just have not been interested yet.

[zyNoT]

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[dhirocz]

I would be more interested in them if I could scan it myself with insite. Last time I checked, 7.6.2 was too old to do it, and I don't want to pay a subscription every year for a newer copy of insite to scan an engine.

What would be great is if you could upload a program to run an x15 into an older ecm and run it from that...but something tells me it's not that easy, or it would have been done already!