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Old 07-10-2009, 07:40 AM   #1
chrisarella
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Unhappy Help: Mocal 20mm Oil Sandwich plate with built in 180 thermostat not fitting

I had Ron at RAW build me a Track Series motor and decided to go with a custom oil cooler set-up to keep temps down on the track and add some extra oil to the system. I picked up a Mocal 20mm Oil Sandwich plate with built in 180 thermostat (oilstat) to control flow to the cooler when temps rise.

I got a call from my shop that when they went to install the sandwich that it wouldn't mate up to the motor. Any ideas why? Can anyone point me in the right direction to get a proper sandwich and oilstat?

Thanks in advance.
Chris
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Last edited by chrisarella; 09-15-2009 at 04:23 PM. Reason: typo
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Old 07-10-2009, 09:43 AM   #2
Frank A
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The Mocal part supposedly works well. Boostjunkie has one on his track sti and told me its been working well for him. I'm planning on running one on my car so I'm very interested in your report.

Can you get any more info from Ron about how its not fitting? Is it an interference issue or is the o-ring diameter too large or small for the mating surface? Did Mocal really send the 20mm thread fitting- if it's unmarked I could see inventory getting switched around.

Frank
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Old 07-10-2009, 10:55 AM   #3
dunk
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Agree with Frank. We need more detail on why it doesn't fit. M20 x 1.5 is the correct thread size. I've run that adapter with no fitment issues.

-Duncan
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Old 07-10-2009, 11:47 AM   #4
Frank A
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another possibility would be if Ron installed a different OEM oil cooler. I've never seen a subaru oil cooler that's dimensionally different, but that is a removable part that I just learned people tend to replace when rebuilding from a blown engine. Reason is that the oil cooler has very tiny channels inside that are impossible to clean.

Frank
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Old 07-10-2009, 12:26 PM   #5
LENNYKIRK
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If you are not running the OEM oil cooler, and try to run just the Mocal it will hit the lip on the oil pan. I trimed off the lip and it sat flush on the block.
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Old 07-10-2009, 10:36 PM   #6
chrisarella
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Thanks guys. Ron isn't doing the cooler install, MSPT here in NY is. They were the ones who had issues with it this week.

I went down to the shop tonight (dressed in my suit from work LOL) and was able to get the Mocal sandwich plate to fit. I just finagled it by hand a little and got it on. It’s only hand tightened on there for now and I left it in place so the guys working on it could see it when they get in on Monday (unfortunately they had left before I got there.

The big issue was getting it to clear around the timing belt cover, but after some wiggling it slid right on. I believe they'll want to trim the timing belt cover a little bit so there is room to tighten the swivel AN fittings onto the straight fittings that are on the sandwich plate, but otherwise it should work. Look at the pictures below, and you can probably see where you’d need to shave a little off the timing belt cover from the pictures... Sorry for the poor quality iPhone pics.

From eye-balling it, I believe there is plenty of clearance through the headers for the swivel fittings and hoses to pass without any issues. The swivel fittings will help to position the hoses so we can pick a good point to mount the clamps and keep them off the headers. The heat shield I bought will cover the hoses near the headers and help protect them. The only real issue now is fabbing up a bracket to mount my B&M oil cooler.

Tell me if I am wrong but I believe trimming a tiny piece off the timing belt cover won’t have any adverse effects. Right?







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Old 09-02-2009, 11:57 PM   #7
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did u ever get it on correctly?
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Old 09-02-2009, 11:57 PM   #8
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did u ever get it on correctly?
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Old 09-03-2009, 08:02 PM   #9
chrisarella
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Right now I'm running the factory oil cooler for my new motor break-in but will be hooking up the custom setup soon. I've just experience one issue after another trying to get the gremlins out of my new build.

Last edited by chrisarella; 09-03-2009 at 11:53 PM.
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Old 09-03-2009, 08:07 PM   #10
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u mean the jdm oem oil cooler?
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Old 09-03-2009, 11:56 PM   #11
chrisarella
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No, I'm running the OEM USDM STI oil cooler right now before I upgrade it all to my hardcore race oil cooler.
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Old 09-04-2009, 01:00 AM   #12
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As an alternative to having to screw around grinding things etc to fit the sandwich plate, Mocal also manufacture a remote oil thermostat which would make things a little easier

Basically all you need to do is buy a cheapish oil cooler kit with a remote oil filter for your car and then install the Mocal remote oil thermostat inline with the oil lines going to the filter and cooler.

Leslie
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Old 09-04-2009, 09:07 AM   #13
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I went with the same Mocal thermostat sandwich plate adapter with a Mocal oil cooler with my recent new motor build.

My tuner and I elected to remove the stock cooler (with the water connections sealed off) as the stock cooler is redundant.

We did this to provide clearance for the adapter, plus my UR twin scroll headers wouldn't clear the oil filter housing if the stock unit was left in place.

I hear you on the "Gremlins" things when doing a built motor!!!!!!! lol

Hope this helps.
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Old 09-04-2009, 12:06 PM   #14
Patrick Olsen
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Quote:
Originally Posted by wildacex187 View Post
u mean the jdm oem oil cooler?
No, he means the same OEM oil cooler that you have on your '02, and that has been on every turbo Subaru since '02 and I think all non-turbo Foresters and Outbacks as well.

Quote:
Originally Posted by blackacres View Post
I went with the same Mocal thermostat sandwich plate adapter with a Mocal oil cooler with my recent new motor build.

My tuner and I elected to remove the stock cooler (with the water connections sealed off) as the stock cooler is redundant.

We did this to provide clearance for the adapter, plus my UR twin scroll headers wouldn't clear the oil filter housing if the stock unit was left in place.
I'm going to leave my OEM (which, incidentally, wasn't OEM on my car) cooler in place and add the Mocal adapter. I figure the OEM cooler will still serve to warm up the oil when it's cold, which is good for day-to-day short distance driving, and it's not going to hurt anything to have a second cooling path once the oil is hot. And in my case it actually helps header clearance a bit, so it works out well for me.

Quote:
Originally Posted by wrxsti.l View Post
As an alternative to having to screw around grinding things etc to fit the sandwich plate, Mocal also manufacture a remote oil thermostat which would make things a little easier

Basically all you need to do is buy a cheapish oil cooler kit with a remote oil filter for your car and then install the Mocal remote oil thermostat inline with the oil lines going to the filter and cooler.
It's worth noting that that option will result in a substantial increase in the cost of your cooler setup. Not only do you have to buy the t-stat itself (which is $110 at Racer Parts Wholesale), but you've also gotta buy 4 additional AN fittings.

Pat Olsen
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Old 09-04-2009, 03:37 PM   #15
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Be really careful on the id sizes on the oil path. The restriction is not good.
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Old 09-14-2009, 03:23 PM   #16
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Is this done with the stock 10mm oil pump, or do you need the upgraded one?
Did the JDM Spec C that had OEM the oil radiator still have an oil cooler?
I know that for the top-mount oil radiator, a helper in-line pump is used, I wonder if this needs it.
At oil change, with thermostat closed, will the oil drain out of the radiator?
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Old 09-14-2009, 03:41 PM   #17
chrisarella
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Quote:
Originally Posted by Vlad View Post
Is this done with the stock 10mm oil pump, or do you need the upgraded one?
I have a custom modified 10mm. Any pump should be fine though.

Quote:
Originally Posted by Vlad View Post
Did the JDM Spec C that had OEM the oil radiator still have an oil cooler?
Oil cooler = oil radiator.


Quote:
Originally Posted by Vlad View Post
I know that for the top-mount oil radiator, a helper in-line pump is used, I wonder if this needs it.
B-line is the only company I know making a top-mount oil cooler for our cars and there isn't any helper pump. It would make sense though since you need to drive a good amount of pressurized oil that high to properly feed the cooler and back.


Quote:
Originally Posted by Vlad View Post
At oil change, with thermostat closed, will the oil drain out of the radiator?
The oil stat only closes the line that feeds the cooler and the return is left open so oil can drain back to the oil pan. The stat is only closed when the oil temp is below 160 degrees, it's partially open between 160-180 degrees, and wide open above 180 degrees. When you shut down the motor one could assume the engine should be within operating temps so the valve should be open regardless.

Last edited by chrisarella; 09-14-2009 at 04:24 PM.
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Old 09-14-2009, 04:17 PM   #18
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Thanks, good info.
Only one thing, I wanted to ask:
The oil cooler that all subaru impreza have is a heat exchanger oil-coolant, situated above the oil filter.
The Spec C had an oil-to-air heat exchanger, situated in front of the radiator. Did this car not have the oil-to-coolant exchanger anymore, OEM?
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Old 09-14-2009, 05:49 PM   #19
chrisarella
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I believe they still kept the standard oil/water cooler when running the upgraded JDM STI oil/air oil cooler because it didn't just cool the oil but also aided in warm-up time.

Where in NY are you?
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Old 09-14-2009, 06:13 PM   #20
Vlad
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Long Island
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Old 09-14-2009, 09:24 PM   #21
chrisarella
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Me too. My car is at Metric. You can come check it out in person when it's done.
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Old 09-14-2009, 10:56 PM   #22
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Thanks, always have time to look at a nice scoob.
You have a tread about the progress?
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Old 03-30-2010, 12:22 AM   #23
Frank A
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just btw in regards fitment- it looks like the mocal plate also conflicts with early-production Perrin headers when the stock water/oil cooler is retained.
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Old 03-30-2010, 04:05 PM   #24
dan az
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I used a prosport sandwich adapter on the block and then the mocal unit after it to provide the necassary clearance, as a side note i have found the mocal unit unable to stop oil flow to the cooler when temps drop, when it gets cold out i get oil temps down to 150, I am moving the cooler to the passenger fender well and putting a large fan on it to stop all the temps from going to low when driving in the cold and keep temps down when its hot and stationary.
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