12-20-2011, 11:57 PM
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#10 (permalink)
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A True Z Fanatic
Join Date: Mar 2009
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Quote:
Originally Posted by m4a1mustang
The plates are never 100% closed for a reason. They only close to about 90%
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Actually, with the standard Mocal thermo plate most people are using, the lines to the oil cooler are never closed even slightly. The thermostatic valve operates on the bypass flow that skips the cooler. When you're under 175-ish, the bypass is open and most of the flow bypasses the cooler because it's the shortest path (but the lines to the cooler are wide open and some flow goes through them, gradually warming up the cooler itself). From 175-185-ish, the valve gradually closes off the bypass passageway, forcing all flow through the cooler at 185+.
Quote:
Originally Posted by cdoxp800
You guys do realize that the oil Temp you see on your gauge is the Oil Temp of the oil temp returning to the Pan correct. This is the Temp coming from the return of the Oil cooler and not the Temp of the oil in the engine.
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I only recently found out about this myself, but the general idea is that yes, the oil temp gauge is reading the coldest point in the cycle if you have an external cooler. The oil that's about to enter the cooler is probably significantly hotter. Still, the value on the gauge is the one you care about for overcooling. If it's too cold at the coldest point, that's right before it gets pushed to the top of your engine to lubricate the very critical stuff (your VVEL heads). Assuming it's even true, which I haven't seen any direct evidence of. But either way it's unimportant for the purpose of discussing overcooling.
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