Nissan 370Z Forum - Texas World Speedway

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Quote:

Originally Posted by Sh0velMan (Post 2612822)

The Mocal units (supposedly) flow 5% as a baseline and then around 180 begin to open up to something close to 100%.

The reason for the 5% always going out is so that your coolers stay purged of air and doesn't have oil sit in there for long periods of time. The downside to that is, if the thermal load isn't particularly high at a given time, the cooler can cool that 5% of bypass down significantly which will lower overall system temp.

?? Unless it's changed since I bought mine a few years ago, Mocal's plates don't work like that - although maybe that's just how we're using words :)

When cold, the bypass and the cooler passages should both be 100% open. Just due to being the path of least resistance, most of your oil will bypass the cooler, but the passage itself is fully open. Then roughly from 175-185 the thermo spring closes off the bypass passageway, which then forces all your oil to go through the cooler passageway. But nothing ever closes (even partially) the passageways leading to/from the cooler. In any case, if the thermo were stuck open he'd see higher temps, not lower.

Quote:

Originally Posted by wstar (Post 2612840)

Interesting, that's the other way around from my understanding of them. There's nothing that explains why he'd be seeing such low temps on the track then, unless it's a bad sender or gauge. (Or human error)

I might replace my 180 degree Mocal with the 200 degree one. If I were buying it from scratch and piecing a kit together I would go with the 200 degree one

Well, whenever I bought mine a few years ago, I asked the Mocal rep over the phone in detail and that's the explanation I got. For all I know that guy just didn't know what he was talking about, but he sounded pretty informed and legit, and his explanation matches the look of the unit's design and the performance characteristics observed.

Yeah even back when I did mine, I thought about the 200F one. The same Mocal guy on the phone recommended against it for some reason or other that I don't even remember, but... yeah, we'd probably be better off with it.