Changing single oil cooler to duel

[Rawze]

(02-15-2020 )Signature620 Wrote:  ... I haven't seen a new 600hp engine with dual coolers since the cm570 was phased out.
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thanks for the info. Makes a lot of sense, and your info about bad programming or other things is spot on too.

rule of thumb on the ISX is that the oil temp should be ~40 degrees(F) above the coolant temp or less. Otherwise the oil cooler is not keeping up (for the various reasons you stated) or there is an oil cooling thermostat or other problem somewhere.

I have actually seen (2 or 3 maybe) 871's with dual elements actually on them, though it is not common. The last one I saw, I noticed it also had a (factory installed) much larger 3-piston (might have been 4-piston) air compressor on it too, but I would not associate the two things as always being associated together. - maybe there are some customer-spec/requested builds running around out there?. I remember looking up the engine ser#, curious about the larger air compressor, and seeing both the dual element coolers and the larger air compressor in the spec sheet on quickserv for it as well.

-- It could perhaps be that some of these engines are sometimes spec'd somewhere, by someone before purchase specifically for a lot of low-rpm high torque PTO?. - That would explain the bigger volume compressor and extra element as the coolant and oil flow would need extra cooling if the engine was under high stress but also rpm moving a much lower overall volume of oil and coolant?- (Speculation). This particular engine was a 535 if memory serves me right, so the dual elements installed were not really justified otherwise.

just sharing some additional thoughts, may not be the case.

I have not seen factory duel elements on a 2250 or 2350 yet tho, but that certainly does not mean none can exist.