ayrton012

The factory 2 oil coolers system is not only too restrictive against flow, even it's integrated (in the coolers) thermostat is not working well. It opens partly at too low temps.

bse50

My car is cooling too much as well with the open oil cooler vents.
I'm using some tape to cover everything and do some more tests, 70°C water and oil temp is UGLY.

9krpmrx8

iTrader: (46)

Okay so this is interesting. yesterday I had a chance to hit some back road hills and I got the oil temp and coolant temps above 200F (oil was at 210F and coolant was at about 205F).

Well when I hit a long straight the oil cooled down to the 170F range within minute, while it took teh coolant a couple of minutes at speed to get down to about 180F.

Your thoughts? Obviously my single Fluidyne oil cooler is efficient but I assumed coolant would cool quicker than oil since usually when the car is sitting it typically takes the oil longer to cool off that n it does for the coolant to cool off.

bse50

You single fluidyne cooler is efficient while going straight apparently! What were the outside temps?
Isn't 210F a bit too much for a hill climb during winter?

olddragger

iTrader: (3)

you have better air flow to the oil cooler than the radiator.
That is one reason I decided to do a secondary radiator for the coolant than redo the oil coolers. The coolant thermostat can react faster to temp fluctuations.
If it only took 1 minute to cool down from 210 to 170?---i would watch that carefully---rapid heating and cooling of the oil and the engine componets is something to be carefull about.
You must have really been in the rpms at lower speeds to get the oil to that temp.
OD

9krpmrx8

iTrader: (46)

I was holding the revs high and purposely in a lower gear to get the temps up. I am going to keep an eye on the radiator because I have a new thermostat and I flushed most of the antifreeze out and replaced it with distilled water a couple months ago.

I will definitely keep an eye on the rapid cooling. I can't wait to get a real data logging solution in so I can get some more specific data.

I am in Texas so there are no real winters here although it has been a bit cold it was in the high 60F's (according to stock gauge) when I was running and I was revving up to about 8400RPM's, no higher. I'm really not sure how much ambient temps affect oil and coolant temps at operating temperatures.

Mazurfer

Damn..........seems like you had to be pushing it fairly hard in 2nd Jorge...correct??? I also assume this was with the A/C off?
Given the same ambient(mid 50ish), I have to really work at it to see coolant temps even close to 205. At the same time, I've yet to see oil temps much over 190F(if that). But...........I've only had the oil gauge in for about a week or two.



We are supposed to get back into the mid-70's to near 80 late this week, so I wanna see what difference this will make.

olddragger

iTrader: (3)

makes a difference.
OD

bse50

Temperatures do affect our cooling systems, i see a difference of about 8-10°c from winter to summer while cruising, a bit less while tracking in fast tracks. Keep in mind that our average winter is just above freezing (6\9°c) and our summers are pretty hot (35\40°c).
I guess that we'll have to wait and see, right?

olddragger

iTrader: (3)

threshold seems to be around 90F (humidity normal--not desert). At that ambient the cooling system (not the oil) starts needing a little help--especially while in traffic.
OD

9krpmrx8

iTrader: (46)

Yeah I guess I will find out in a couple of months

olddragger

iTrader: (3)

that texas heat dude --long hwys and shimmering heat waves---yep. beat you absoulutely will not have ANY oil condensation build up!

always.anthony

". you should always use a 50/50 mixture of antifreeze and water. Water, even distilled causes rust. Most headgaskets are made of thin metal. The water will rust around the water ports and cause the gaskets to leak. The replacement of a head gasket or gaskets will run several hundred dollers and worst casue serious engine damage can result. Antifreeze has additives that help to lube the water pump, inhibitors to keep rust in check and the 50/50 mixture will actually keep your engine running cooler. "

just thought i'd share that.

MazdaManiac

iTrader: (3)

Uh, no.

Not exactly.

Head gasket? "Dollers"? "Casue"?


True. A splash of the stuff will do the trick.

Uh, no. Again.

9krpmrx8

iTrader: (46)

Thank You MM. I run 75/25 mix distilled water and antifreeze.

quazmosis

iTrader: (2)

I'm about a 65/35 mix and I'm pretty much NA.

always.anthony

i quoted. picked it up somewhere, and like i said, i just thought i'd share. you guys chime in. i learn.

to mazdamaniac.....idk where you get your avatar pics from. but keep them coming :P

9krpmrx8

iTrader: (46)

Just thought I would share this. I was driving my bosses daughters C63 AMG 6.3 V8 (yes his 17 y/o daughter) and this is what I wish the 8 had from the factory




The oil temp flashes and the cars rev limit is restricted until the oil temp reaches 180F.

MazdaManiac

iTrader: (3)

I wouldn't drive hard until my oil got above 175°F at least.
A lot has been thrown around about oil temps, but until someone starts seeing oil temp that are at or above their coolant temps at max under heavy load, I think its a non-issue.

9krpmrx8

iTrader: (46)

In this weird cold weather mine is averaging about 170F on the return line from my Fluidyne cooler. But I don't drive hard until its at least at 160F.

MazdaManiac

iTrader: (3)

165°F at the coolant is the exit point for open-loop, cold-start.
You should let your oil get at least that high.

9krpmrx8

iTrader: (46)

Yeah I am actually thinking I need a better oil thermostat because technically its a 180F thermostat so it should close up if it drops below 180F. But I'm not sure how accurate the wax thermostats are. When its hot I could definitely tell when the thermo opened (temps dropped like 10-20 degrees within seconds) but I'm not sure how quickly it closes back up.

Jedi54

iTrader: (7)

pushing it fairly hard would be an understatement.
I was de-carbing... yeah.... that's it...
I completely agree.
I stay below 4k rpm's until at least 150F° and even then a good 5 minutes before I'll even think about redline.

Yeah, I dont get the fascination with oil temps, they have NEVER been an issue for me, even in triple digit heat.

9krpmrx8

iTrader: (46)

Quick question: Triple digit heat on the track? Thanks for the input.

olddragger

iTrader: (3)

never seen oil temps on track --even with 105Fambient --above 220F. Now my coolant temps on track may be a little lower than others because of my mods.
I do not worry about lubrication issues on the track now. I do closely watch coolant temps !
If that gets at or above 220---i back off quick.

At speed a lot of cooling gets done at the oil pan. Not just the coolers.
Heck on a 40 F day with both coolers totally blocked--- on the interstate ---my oil temps are around 170F . They go up as soon as I slow down.

Now most of us are checking temps post cooler---so the pan oil temp would be a good bit higher?
OD