Liner Height

[Running rough]

yes deeres 2 biggest model tractors do indeed use a tier4 final commen rail cummins qsx15, the qsx15 is basicly the same engine as the isx15, ther are a few differences though, different turbo, differnent compresion pistons, and a diferent torque curve, qsx15 are not set up to lug down as far as truck engines the torque tapers off below 1600 rpm where as in a new isx15 you can get full torque down in the lower rpms, i still think cummins uses center bore pistons, jds pss 13.5 litre powerteck engine is a duel turbo single overhead cam design that is an evalution of thier older 12.5 liter but with more bored pistons same stroke, and that engine was very simuler to the famous detroit series 60, aperently detroit and deere went togather to design an engine and then they went thier seperate ways with detriot coming out with the series 60 and deere coming out with the powertec line, anyways the newer 13.5 deere engines use offset bores and it sames it works well for them, this engine can make up to 618 hp and 2050 torque when you look it up on industrial aplictions on thier site and i belive 750 in marine, but for some reason they limit them to 520 in the 9r tractors, and over 600 in thier combines, it begs the question so why even use the cummins, the salesman say it is mostly emissions reasons, i have ran both a 9510r with the deere moter that was chipped, and a 9570r with the cummins, with the chip the deere engine was suppesed to put out the same power as the cummins but i would say it fell short on top end power, however that being said the deere engine has a flatter torque curve meaning it can lug better below 1600 rpm,i like both moters but like the qsx15 because im a cummins fan and i think it looks good painted green, but i would say the deere 13.5 is defintly not a weak engine, it has a lot of cast and rib support in the block along with topstop liners and a massive head, the head on that moter i would say weighs just as much as the block, from looking at it anyways, it heavly uses pulse injection at every engine rpm acording to deere, the injecters and valves are cam actuated from a single overhead cam so it is NOT commen rail but still makes 34000 psi injection presures, it has all the same emission stradigy as the qsx15, egr, dpf,scr, but the qsx15 sames like a simpler engine to work on visially looking at them both,