HOW TO DO AN ADVANCED SEARCH.

Mon Jul 08, 2013 3:56 pm by Admin


For the benefit of 944Hybrids users there are two search functions available for you to use.
The purpose of this sticky is to explain the "Advanced Search" function because it is much more powerful and is the best choice when researching information.

When you log on to the site a list of options is shown in a line at the top of the page. One option is labelled "Search", use this option (NOT the search box lower down on the right).

After you click on the upper search option, a drop down box appears. At the bottom of this box is a radio button marked "Advanced …

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RX7 Oil Cooler

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RX7 Oil Cooler

Post  Rich L. on Tue Mar 27, 2012 6:07 pm

Now that the car is running, one issue I'm having is over-cooling of the engine oil. I'm using a Mazda RX-7 FC unit with an integral thermostat which seems to open around 140 F. On track my oil isn't even getting over 150 F which is too cold. Does anyone know of a replacement thermostat for the OEM RX7 oil cooler that opens more like 190 F?

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Rich

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Re: RX7 Oil Cooler

Post  Lemming on Tue Mar 27, 2012 6:48 pm

Drive harder affraid

You could always cover part of the cooler if needed.
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Re: RX7 Oil Cooler

Post  Rich L. on Tue Mar 27, 2012 6:52 pm

Heh, how'd I know someone would say that. Wink

I sure could cover part of it. Or even install the original non-vented nose panel. I just worry it'll be a constant battle of too much / too little cooling. Ideal would be a more appropriate thermostat.

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Rich
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Re: RX7 Oil Cooler

Post  docwyte on Wed Mar 28, 2012 8:24 am

Or wait to change anything until summer time temperatures hit. You may find things are more than hot enough then.

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Re: RX7 Oil Cooler

Post  Lemming on Wed Mar 28, 2012 9:23 am

You guys have it easy as far as temps, I have to deal with Alabama and Georgia temps in the high 90's as well as 95% humidity. I'm just hoping to keep my car from melting this summer cherry
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Re: RX7 Oil Cooler

Post  docwyte on Wed Mar 28, 2012 9:26 am

Not so easy for me. Thin air due to elevation and temps in the high 90's to low 100's during the summer...

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Re: RX7 Oil Cooler

Post  Rich L. on Wed Mar 28, 2012 10:19 am

True. I'll be dealing with 90s in eastern Oregon this summer. And we're planning a trip out to Miller in Utah this summer, that'll be hot. But this past Satuday was a sunny 60 degrees at about 200 feet of elevation. Hah!

Rich
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Re: RX7 Oil Cooler

Post  docwyte on Wed Mar 28, 2012 10:53 am

My high oil temps last year were 270. Coolant temps lagged that by a little bit. Before that oil and coolant temps of 230-240 were typical.

I replaced the radiator and did some more ducting in the off season, we'll see what happens now.

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Re: RX7 Oil Cooler

Post  Rich L. on Wed Mar 28, 2012 2:58 pm

I hope that helps, Doc. What radiator did you use? I'm running a new turbo radiator, so far so good with water temps staying right at 190 degrees.

As for my oil, I'm looking into adding an external Mocal "high temp" thermostat. However, the plumbing is tricky given how I've got the external filter physically arranged. I have them inline and really like both the location and the plumbing and don't really want to set things up as Mocal specifies.

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Do y'all think it'd be okay to not route the return oil through the thermostat? I'd plug the "from cooler" port and use it as a Y instead of as an X. The remote filter mount I got from Eric and is nice as it has 2 inlet ports so that part would be easy. Would this work?

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Re: RX7 Oil Cooler

Post  docwyte on Wed Mar 28, 2012 3:02 pm

I went with a new turbo radiator. I have that same Mocal oil t stat, but have it plumbed the "standard way". I'm not sure if it'll work the way you propose, but nothing ventured, nothing gained....

I've been driving my car on the street lately and have 190 water temps, but that's typical. They don't climb until I'm on the track...

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Re: RX7 Oil Cooler

Post  Rich L. on Wed Mar 28, 2012 3:19 pm

Cool. (get it? cool...) Wink

I have an SLP 160 degree thermostat on the way to try.
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And an interesting book:
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It's convinced me the best temps are 70C for water and 100-110C for oil. So that coolant thermostat above and the "high temp" Mocal oil thermostat should be ideal. This assuming the radiators themselves can keep up.

Cheers,
Rich
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Re: RX7 Oil Cooler

Post  Lemming on Wed Mar 28, 2012 4:25 pm

You may need to put in a one-way valve or two with that setup.
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Re: RX7 Oil Cooler

Post  docwyte on Wed Mar 28, 2012 4:26 pm

My radiator wasn't keeping up last season. I hope that the new one can, otherwise I'll have to pony up to the Wizard radiator...

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Re: RX7 Oil Cooler

Post  Lemming on Wed Mar 28, 2012 4:29 pm

docwyte wrote:otherwise I'll have to pony up to the Wizard radiator...

Griffin for around $250.
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Re: RX7 Oil Cooler

Post  Rich L. on Wed Mar 28, 2012 4:36 pm

If my turbo rad doesn't keep up, I'll probably follow your lead on the Griffin. I've left the Porsche coolant thermostat, relays and fan wiring for now. But I'll rewire to use the PCM signals if/when I do a new rad.

Back on my oil system, here's an updated diagram. I do have a check valve in there to keep flow from the accusump going to the engine. I think I see what you mean about adding another in the bypass line, but if the thermostat is closed there would be backward pressure in that line but not flow. The odd thing is the oil would cool in that bypass line given the lack of flow and I wonder what that cooling would affect within the return side of the thermostat.

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Re: RX7 Oil Cooler

Post  a951 on Wed Mar 28, 2012 5:14 pm

I use a mocal thermostat, works great.

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Re: RX7 Oil Cooler

Post  acorad on Wed Mar 28, 2012 10:02 pm

Lemming wrote:Griffin for around $250.
Which Griffin?
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Re: RX7 Oil Cooler

Post  Lemming on Wed Mar 28, 2012 10:16 pm

acorad wrote:
Lemming wrote:Griffin for around $250.
Which Griffin?

Mine is not a direct fit, a bit too wide and has to be angled forward. Call them and tell them the dimensions, they will make it to fit. I was in a hurry, so had to take one off the shelf (race was coming up).
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Re: RX7 Oil Cooler

Post  Rich L. on Thu Apr 05, 2012 2:35 pm

Okay, it's done. I installed a Mocal 501 thermostat capping the "in from cooler" port. In a test drive last night the oil came right up to 160 F, and then fluctuated around 165-175 F in traffic. The thermostat is supposed to start to open at 160 and be fully open at 180. It's also got 3 handy 1/8" NPT ports for sending units that I made use of and simplifed the ugly tree of brass fittings I had before.

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So far so good. Saturday I'll see what it does on the track.

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Rad man

Post  gamman on Wed Apr 11, 2012 11:44 pm

Guys maybe someone can help him out, there was a huge phd dissertation on rads and cooling with Ls1 or a pirate board link or something, I recall thinking I will never need to know this. It was on the last board. And like 15 pages.???
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Re: RX7 Oil Cooler

Post  Rich L. on Thu Apr 12, 2012 11:57 am

I'm giving up on the RX7 cooler and pulling it out. It was an interesting idea to leverage the in-line thermostat but it's just not working out. I'm installing an Earl's bar&plate cooler and will plumb the thermostat in the standard way.

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Re: RX7 Oil Cooler

Post  a951 on Thu Apr 12, 2012 12:00 pm

all my stuff goes through filte first, them thermostat, cooler, etc.

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