Texas World Speedway

wstar · 12-17-2013, 12:00 AM

Quote:

Originally Posted by Sh0velMan

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.

Sh0velMan · 12-17-2013, 09:09 AM

Quote:

Originally Posted by wstar

?? 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.

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)

DR_ · 12-17-2013, 09:36 AM

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

wstar · 12-17-2013, 09:38 AM

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.

wstar · 12-17-2013, 09:39 AM

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.

12-17-2013, 09:38 AM	#49 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3594	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. __________________ 7AT Track Car! Journal thread / Car setup details

12-17-2013, 09:39 AM	#50 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3594	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. __________________ 7AT Track Car! Journal thread / Car setup details

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12-17-2013, 09:36 AM	#48 (permalink)
DR_ Track Member Join Date: Jul 2009 Location: Dallas Posts: 981 Drives: Touring/Sport M6 PG Rep Power: 17	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