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Message: [QUOTE="Big Bore, post: 1430405, member: 760"] It also reduces the heat from the friction of forcing the oil from not one, but two pumps through one IPR. The IPR outlet line on a set of one brand of duals was incredibly hot, melting any plastic parts associated with the fittings. It was also a pretty small line. My opinion is it was causing a lot of unwanted disturbance to the oil in the form of aeration in addition to the heat as it squirted through . The remote dual IPR block galleries are massive, and it is removed away from the engine heat which also allows for adding additional cooling options, I believe HRT addressed this in later models of his block. So yes, in theory the dual pumps were supposed to solve the oil supply problem, but running both pumps to a single IPR was a step backwards IMO, not to mention having them pressurizing each other (described as balancing) before sending oil to the IPR. The other dual pump setup used two IPR's but kept them in the stock location which also IMO is bad due to very poor access to a known problematic part, and again the heat soak issue, which could also be a source of the common failures. Filtration before the IPR's would help with the failures too I think. [/QUOTE]

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