Originally Posted by hornetball
(Post 1531896)
Valve springs? R U serious?
Find a piece of metal which is thin enough for you bend it easily. Bend it back and forth rapidly until it snaps. Did it get warm before it snapped? Now imagine doing that to sixteen pieces of metal strong enough to resist Hustler's mom standing on them, 58 times per second. Each. I can totally see the valve springs being a major contributor. I'm having trouble with the assertion (in the other thread) that the oil pump itself creates more heat than the valve springs, pistons / rings, bearings, etc. |
Joe. Not a good example. In your case, the material is yielding, thus work is being done. In a valve spring case, operating in the elastic area, the energy is stored and released. Only hysteresis is involved in a well designed spring. I would anticipate very little loss in the springs themselves.
|
Point of reference, NASCAR uses sprinkler systems to get oil onto the valve springs to keep them cool to promote longevity. They typically run between 6 and 8000 RPM for extended periods of time. I'm not sure what other forms of racing implement strategies like this.
|
So- RPM is the primary source of heat input to oil.
Unless breaking my engine by remaining at the rev limiter on the street is my actual goal, I won't need to cool the oil (probably). Adding power will add much more heat to the coolant, but not much more heat to the oil. Google tells me that ATF has a viscosity similar to 5W20, so I don't think the amount of tubing would end up being too flow restrictive, especially with less overall distance to the lower portion of the radiator than to go around it as most oil coolers are mounted. Another possible advantage to this setup is that the whole system could hold more oil, resulting in a larger effective heat sink. Another thread on this forum said it would be possible to use the oil cooler from a 1.8 in a 1.6. I like the idea of having a water-cooled oil cooler, since it aids in warmup initially and keeping the overall temp down, but adding another heat load to the coolant system seems a good way to encourage overheats. |
Originally Posted by DrPoke
(Post 1531962)
Another thread on this forum said it would be possible to use the oil cooler from a 1.8 in a 1.6. I like the idea of having a water-cooled oil cooler, since it aids in warmup initially and keeping the overall temp down, but adding another heat load to the coolant system seems a good way to encourage overheats.
With only a modestly sized radiator and no re-route, I never once overheated the car in spirited driving in the California desert. (Eg, climbing Palomar Mountain at felonious speed.) It only started to overheat after I moved to Florida and got stuck in stop-and-go traffic in August, and a reroute cured that nicely. |
Originally Posted by DrPoke
(Post 1531962)
Another thread on this forum said it would be possible to use the oil cooler from a 1.8 in a 1.6. I like the idea of having a water-cooled oil cooler, since it aids in warmup initially and keeping the overall temp down, but adding another heat load to the coolant system seems a good way to encourage overheats.
You may also wanna check that. Joe, do you have any idea about the heat exchange surface area of the OEM oil to water heat exchanger? Just by looking at it, it looks quite small to me, especially when given the relatively small delta T between oil and water. |
Auto trans cooler in radiator will not flow enough volume. The restriction will starve and destroy your engine.
|
Originally Posted by DrPoke
(Post 1531962)
So- RPM is the primary source of heat input to oil.
Unless breaking my engine by remaining at the rev limiter on the street is my actual goal, I won't need to cool the oil (probably). |
Originally Posted by HarryB
(Post 1531995)
https://www.speedflowshop.co.uk/lami...lers-174-c.asp
You may also wanna check that. Joe, do you have any idea about the heat exchange surface area of the OEM oil to water heat exchanger? Just by looking at it, it looks quite small to me, especially when given the relatively small delta T between oil and water. The factory version obviously does something, but not enough in my situation (track). Anecdata (eg Joe) seems like it works in mountain driving, but looking at size of water lines, and volume available, it obviously is limited compared to the Laminova. |
Originally Posted by sixshooter
(Post 1531939)
Point of reference, NASCAR uses sprinkler systems to get oil onto the valve springs to keep them cool to promote longevity. They typically run between 6 and 8000 RPM for extended periods of time. I'm not sure what other forms of racing implement strategies like this.
http://www.grumpysperformance.com/12519_4_.jpg
Originally Posted by Gee Emm
(Post 1532138)
The factory version obviously does something, but not enough in my situation (track). Anecdata (eg Joe) seems like it works in mountain driving, but looking at size of water lines, and volume available, it obviously is limited compared to the Laminova.
|
Originally Posted by sixshooter
(Post 1531939)
They typically run between 6 and 8000 RPM for extended periods of time.
NASCAR engines are absolutely fascinating to me. At one point in recent history (last 10yrs or so) they had a higher BMEP than any other motorsport engine, F1 included. |
Originally Posted by Savington
(Post 1532162)
NASCAR motors are designed to spin out to something like 10,500rpm. I have seen in-car video with data from Sonoma where they would spin the motor that high into T11. On the ovals, NASCAR specifies the rear end ratio, and they typically park the engines in the high 8k range, so the teams optimize for that, but if given the choice, I think they'd spin them higher on a regular basis.
NASCAR engines are absolutely fascinating to me. At one point in recent history (last 10yrs or so) they had a higher BMEP than any other motorsport engine, F1 included. |
Originally Posted by sixshooter
(Post 1532001)
Auto trans cooler in radiator will not flow enough volume. The restriction will starve and destroy your engine.
|
Meant this post for oil tech thread.
|
All times are GMT -4. The time now is 10:46 PM. |
© 2024 MH Sub I, LLC dba Internet Brands