bulletLS1

well... after a few days of driving the monster, I noticed very worried about the high oil temp, from a autometer oil temp gauge (electric) (duhhh)
here are the engine rebuild generals.
is a 98 camaro (acurate (???) water temp.)
ls6 block.
ported polished radiused oil pump
shimmed spring for O/P
deburred and rounded (as possible) edges inside oil passages in block.
ls6 coated stock pistons.
stock rods @ stock clearance .002
tightened mains (block came stock loose) to .0015
stock crank, polished.
stock (came with block) cam bearings
lunati cam (very early ls1 cut, 219-227-116lsa)
CNC stage II heads periferic bolts. (again very early ls1 designs)
head gasket of secon gen ls1 (OOPPPS!) no water leak.

present oil and presures

65-75 psi cold @ 1000rpm
65 psi 160F @ 1000rpm
65 psi 200
50 psi 220 @1000 100C water
35 psi 250 @1000 +100C water

wix oil filter
motul 4100 10W-40
using only water, (no coolant)

ambient temp around 25deg C
humidity 80-95%
5000´ over MSL
The thing is that driving easy around town in trafic the temp rises very quickly to 220F and a couple of hard trafic light 240-250.
did not lapped the car in a track day (low mileage yet)

Im seriusly doubting the instrument, also setting apart some money for the oil cooler (i did not wanted to put oil cooler )

opinions are greatly wellcome

BLKWS.6

Coolant temps as a rule are 100* or so below oil temps as I recall, or is it 200*? Either way, your oil is way hotter than your coolant and 240-250* is normal for oil, if not a bit cool. THe vaport point for most oils is 380-420* and so you are VERY MUCH ok. Now if you mean your temp for coolant is 240-250....whats your oil temp??

TS6

iTrader: (41)

That can't be right. Oil temps are supposed to be lower than coolant temps. and the moisture boils out of oil at a much lower temp than 380 degrees. I wanna say like 220 or somthing, but I can't remember.

NEVRLIFT

You are right, ususally oil temp for LS1's is about 200-220 IIRC. On a road course you will probably 240 to even 300 but that's pushing it.

bulletLS1

as I recall the oil temp is HIGHER than of water coolant, (but not for much!) and I used to have a ferrari (348) and recomended that "do not push the engine(?) if oil tem is 180 or lower" go figure!

sorry for the denomination mixup but my Instrument/p is canadian (metric) hence the water in celcius, oil p in mpascals (yuck) and my oil temp in *F (because is a autometer)

I mean temp fro OIL@ 240 250*F

it is true that the flashpoint of oils is 380-420*F but that in its purest forms, the ADDITIVES start to break down at around 300-320*F, sintetycs is much higer because the do not use as much viscosity modifiers as regular mineral stocks.

cantdrv65

iTrader: (3)

My oil temp on my Z06 is always slightly hotter when warmed up at operating temps. At 210F coolant temp my oil temp is usually around 230F...

smask04C5

iTrader: (1)

Oil begins to coke at 320*, synthetics slightly higher. Typical oil temps should not exceed 240* with proper setup.

Uthinkso

Oil temps will most always be higher than water temps but not by much.

For example an engine operating at 190-200* water temp would see 225-235* oil temp. That is about the max you should see out of a street car unless in the extreme heat or really beating on it.

bulletLS1

STILL WORRIED:
where this heat come from?
is the tight bearings? .0015 (the new specs even show .001!)
is the oil pump beyond eficiency, and the pumping loses represent turbulence and heat?
coul de the tight fitting pistons (ls6 block, ls6 pistons), apparently last gen pistons as they are coated w/teflon at the sides, I bought them used w/rods, they came almost perfect, no scratches, well packed, and the rings where practically new.
wrong head gasket (2 gen LS1) installed in a periferic bolt heads, besides it will show as high WATER temp.

definetelly will use a oil rad, BUT NEED TO KNOW WHERE THIS HEAT CAME FROM

THANKS!!!! for your coments

LostCauseZ06

iTrader: (4)

with my new 408 build in the Z06 i constantly see 220-230 oil temps and 200-215 coolant temps... ALWAYS...

bulletLS1

yesterday rained cats and dogs in my city, sooooooo, I took the car all day and driving in heavy trafic, some trafic light busted, a lot of uphill slow but steady... , and the dam oil temp stayed 210-230, on only one ocasion I saw 240 (whe it stoped raining)
I guess the splashing in the oil pan made it.....
it is time for an oil rad.... :-(

SUTTERERMAN85

iTrader: (42)

my oil temp runs right at 210 all the time. i am getting an oil cooler soon though.

dailydriver

Did the builder tell you to run 10W-40 in it?? If it was built real tight, that might be too thick (I did not look up the operating temp cst on the 4100). In any case, maybe try the 300V (if you want to stick with Motul), it has more good soluble moly and is more geared towards racing/high heat apps. Yes, I would also put in a good oil cooler ASAP, especially considering where you live!!

bulletLS1

thanks, the builder was ME! I had better results with this oil than say quaquer or GTX
Ill try the 300V
definetelly a cooler is on its way!!!!
actually the block new came loose, i dont remember how loose with std berings (race bearings) but the shop milled the caps to my specs (.0015) since oem specs for new was .001-.0025 I´d didnt think "too tight" until the average engines are much looser...

I know the new pistons fit tighter, the bearings are also tighter I wanted to keep that line, so i can use a thinner oil al the engine lasted longer than first time (+-70K Km.)
Mi city is average colder than miami in summer. 24*-28*C