valve lash
Le Mans Master
Joined: Jan 2000
Posts: 5,074
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From: Poway CA
2025 C1 of the Year - Unmodified Finalist
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Interesting info on oil temp.. On my LS1 (C5) with no oil cooler, it gets up to about 220-230 after about 15 minutes and stays there.. regardless of idle, cruise, etc. (although I've never measured it while drag racing!)
Safety Car
Joined: May 2003
Posts: 4,797
Likes: 239
From: Ocean Township NJ
I had early "flat dash" C4 with digital gauges. It had Z51 which included a tiny oil cooler just above the oil filter. The oil temp was governed with the cooling fans. The coolant temp would climb to 227 degrees when the fan(s) would kick in. This would quickly pull the coolant temp down to around 200 degrees. The oil temp was more tightly controlled, albeit, indirectly by the coolant temp. I don't remember the exact spread, but was always higher than the coolant temp by a good 15 degrees on average. Coolant fan cycling caused a much smaller swing in oil temp which was more sensitive to ambient and driving conditions.
Safety Car
Joined: May 2003
Posts: 4,797
Likes: 239
From: Ocean Township NJ
My engine block config is very different from most, so the disparity will be greater in my case than that of a more conventional setup.
I purposely designed it for lowered intake manifold temps (pegged @ 165 independent of ambient or driving cycle) and oil temps variable between 200 and 240 depending on driving cycle.
Better to ask this of someone with a digital dash C4, Jim Lockwood, Jerry Gollnick or another racer with an accurate gauge.
Last edited by 65tripleblack; Oct 24, 2017 at 03:13 PM.
Melting Slicks
Joined: Jan 2007
Posts: 2,842
Likes: 622
From: Pasco Florida
Quite nutes on a 95 degree day.
My engine block config is very different from most, so the disparity will be greater in my case than that of a more conventional setup.
I purposely designed it for lowered intake manifold temps (pegged @ 165 independent of ambient or driving cycle) and oil temps variable between 200 and 240 depending on driving cycle.
Better to ask this of someone with a digital dash C4, Jim Lockwood, Jerry Gollnick or another racer with an accurate gauge.
My engine block config is very different from most, so the disparity will be greater in my case than that of a more conventional setup.
I purposely designed it for lowered intake manifold temps (pegged @ 165 independent of ambient or driving cycle) and oil temps variable between 200 and 240 depending on driving cycle.
Better to ask this of someone with a digital dash C4, Jim Lockwood, Jerry Gollnick or another racer with an accurate gauge.
Safety Car
Joined: May 2003
Posts: 4,797
Likes: 239
From: Ocean Township NJ
Yes its filled to the bottom of the water pump inlets. It takes a lot of load off of the radiator and fan and transfers it to the oil cooler.
Last edited by 65tripleblack; Oct 25, 2017 at 03:21 AM.
Melting Slicks
Joined: Jan 2007
Posts: 2,842
Likes: 622
From: Pasco Florida
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Burning Brakes
Joined: Jun 2014
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From: Brentwood CA
Safety Car
Joined: May 2003
Posts: 4,797
Likes: 239
From: Ocean Township NJ
Oil cooling depends more on the lower block water jacket than the upper inch plus the heads, right?
Melting Slicks
Joined: May 2007
Posts: 2,415
Likes: 154
the oil splashing against the water cooled bottom end of the block pulls some heat out of the oil. with no water in the bottom of the block you get no cooling of the oil
Safety Car
Joined: May 2003
Posts: 4,797
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From: Ocean Township NJ
My response to Critter (Michael) deals with oil temperature stabilization.
Race Director
Joined: Feb 2007
Posts: 15,468
Likes: 8,950
From: northern california
C2 of Year Finalist (track prepared) 2019
Quite nutes on a 95 degree day.
My engine block config is very different from most, so the disparity will be greater in my case than that of a more conventional setup.
I purposely designed it for lowered intake manifold temps (pegged @ 165 independent of ambient or driving cycle) and oil temps variable between 200 and 240 depending on driving cycle.
Better to ask this of someone with a digital dash C4, Jim Lockwood, Jerry Gollnick or another racer with an accurate gauge.
My engine block config is very different from most, so the disparity will be greater in my case than that of a more conventional setup.
I purposely designed it for lowered intake manifold temps (pegged @ 165 independent of ambient or driving cycle) and oil temps variable between 200 and 240 depending on driving cycle.
Better to ask this of someone with a digital dash C4, Jim Lockwood, Jerry Gollnick or another racer with an accurate gauge.
When we drove my bride's track car on the street, it would take a good 15 - 20 minutes for the oil temp to completely stabilize. Oil temp (with no cooler) would generally track coolant temp in street driving.
On the track, coolant would stabilize at about 190 while, on hot days, oil temp would head toward 250. With no oil cooler, I wouldn't say the oil temp ever really stabilized.
Jim
Drifting<br><img src="/forums/images/ranks/2k-3k.gif" border="0">
Joined: Aug 2016
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From: Grosse Pointe, MI
Aluminum heads
What's the rule of thumb with aluminum heads? Only set when "hot"? With cold heads on a new build, should they be set a little tighter or looser till it gets hot?
Race Director
Joined: Feb 2007
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From: northern california
C2 of Year Finalist (track prepared) 2019
Team Owner
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