silentblu

iTrader: (1)

this isn't another synthetic vs dyno oil thread

I'm just wondering, i have a mocal dual oil cooler kit, and was wondering if all the other guys that have this kit, also drain the oil cooler, and lines when they change the oil? its not hard, but i don't know if it makes a mess or not

i'm sure theres oil in there, just don't know if theres enough to have to actually change that also. Theres at least like a good 1/2 quart in there, i think

thanks

rynberg

No, I don't. Considering I would have to remove the front bumper to do so....

silentblu

iTrader: (1)

hmm, well you can always remove the lines off the thermostat no?

dgeesaman

iTrader: (7)

The thermostat? That's at the water pump.

Really, there isn't a good way to handle the oil coolers unless you install an inline drain. Changing more often is IMO the best answer, and has additional benefits.

Dave

joe1573

iTrader: (14)

[QUOTE=dgeesaman]The thermostat? That's at the water pump.

dual oilcoolers have a oil thermostat, i just found that out my self. i've been looking at banzai racing set up, they have a parts list on there site which calls for a MOCAL OIL THERMOSTAT.
about draining the oil, i would not worrie about it. you never can get all the oil in the engine out when you change it. you get most of it and use a good filter.

Gadd

You could easly install a valve or a plug in an aftermarket oil cooler setup. It's always best to remove as much old oil as possable when changing the oil. But when you restart the motor after draining the coolers, it will take a few seconds for the oil pump to refill the coolers and lines before supplying any oil to the engine. You might pull the fuel pump fuse and crank the motor for a few seconds to prime the system before starting.

rynberg

What? That's not how it works at all. Once you've filled the pan and start the car, the oil will circulate in the engine until the t-stat opens up, then the coolers will start to fill (actually, the t-stat always allows a trickle through, so they will be filling up slowly before then). Once the t-stat opens up, you will have to add more oil.

silentblu

iTrader: (1)

As i was contemplating if there was a need to buy/install the oil cooler thermostat or not, i noticed that they were constantly open.

i was thinking of just setting up the lines without the thermostat so the oil would constantly flow, but ended up getting the thermostat anyways.

when i did buy it, i noticed it was just a spring, that opens fully and slighlty at certain temps, without it installed it was open, so it should get oil once the car is started

Mahjik

iTrader: (1)

The goal is not to run the oil as cold as possible, but to "keep" the oil at an optimal temperature. Cold oil does not lubricate as effectively as warmer oil. That is the whole concept of the oil thermostat which is to allow the oil to warm up and then open to the coolers when they need to be used.

Gadd

Certainly, but your still dealing with lots of air in lines and coolers ( especially in oversized aftermarket coolers ) and that air has to go out through the oil passages sometime while the motor is running. And the thermostat does not compleally stop the flow though the coolers, infact I'll bet air passes right though. So a bit of of priming will help fill the coolers.

dgeesaman

iTrader: (7)

I did a quick look in the FSM and parts lists, and I can't find where this oil thermostat is. I see reference to it on D-3 of the FSM as a "Control Valve", but not much else. Considering how critical oil cooling is, I'm surprised this isn't discussed more often.

Can anyone fill me in further?

Dave

rynberg

Dave, the stock t-stat is an internal part of the driver's side oil cooler.

rynberg

How is that any different than when you drain the oil out of the pan? The pan fills up with air once it is drained and has to be passed out through the system.

Gadd

Because the oil is pumped from the oil pan out the front cover to the oil coolers and lines then to the oil filter and to the rest of the oil passages in the motor. The air can only get out when the motor is running. Have you ever noitced that in takes longer for your oil pressure to come up after replacing the oil filter? Same thing just more air.

rynberg

But if the tstat is closed, the oil is NOT pumped out of the pan. Maybe I'm missing something here....where's Kento when I need him?

Busted7

I belive the motor recieves oil before it exits the front lines to cooler! My builder also told me that if you dont have oil cooler thermostat it might cause combustion to be altered as rotor temp. might be to low. It sounded odd to me but i do see were it would lower temps.

Gadd

Take a look at the oil flow drawing in the service highlights manual, section D. Any air in the coolers and lines has no place to go except through the engines oil passages. Now this is not the end of the world, the motor will survive, but you would expect extra bearing wear for the few second with no oil pressure. Hence my sugestion to prime the oil system by cranking the motor if you drained the oil coolers.



Possible, but that would be an extreme case. The real reason for the thermostat is as Mahjik posted

silentblu

iTrader: (1)

well specifically speaking about the duals, the return line is fairly long, so if one were to drain the lines off the front engine block, that wouldn't do as much damage on the bearings, as draining the whole system.

sort of half draining the coolers, OR add as AST in between =D

Busted7

I agree i thought the lower rotor temp explainiation was minimal at best. As has been stated changing oil at the right time is the best plan.

Mahjik

iTrader: (1)

IMO, its not worth it. 90% of the deposits are going to be in your oil pan and thats what you want to get out of there. Even with any oil left in your oil cooler and/or lines, the majority of the oil in the car after your oil change will still be *new*.

Gadd

I concur, changing the oil often is the best policy.

93vrfd_houston

iTrader: (10)

how often do you guys change your oil? every 1k or 1.5k miles?

silentblu

iTrader: (1)

i was thinking 2000, 2500 the latest