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Old 01-10-2019, 10:05 AM   #1
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ISX

What is the cost difference between an ISX 12 and X15 engine. For example the ISX 12 in the Newmar MA and the X 15 in the Newmar LA?
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Old 01-10-2019, 10:11 AM   #2
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size one is 12 liters 500hp the other 15 liters and 600hp
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Old 01-10-2019, 10:46 AM   #3
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Completely different architecture on each engine. The only real commonality is the red paint.
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Old 01-10-2019, 10:48 AM   #4
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$26,492 additional. But only if you purchase in quantities.
Within the vehicle there are also increased costs for the larger radiator, hydraulic system, differential, as well as other support systems.
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Old 01-10-2019, 08:53 PM   #5
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The ISX is no longer being built by Cummins. The new replacement engine is the X15. There are numerous changes to the X15 like a SOHC vs ISX DOHC. Much more similar then different the two engines.
X12 is also very different then either the ISX or new X.
We have the newer X15 in a Newmar London Aire and are very pleased with both the power and fuel economy.
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