Oil cooler tech
#401
Probably depends on what "street driving" means. I've got the lower temp thermostat and don't have issues, even in winter. But my commute is ~40 miles almost all at 60mph or above and a lot at 70mph+. So, I'm mostly 3-4K RPMs. My oil always settles about 10 degrees above water temp (usually 195-200 water and 205-210 oil).
A short commute, low speed or lots of stop-and-go would completely change that. Oil cooler is really a track mod. I'm considering pulling it off my daily to optimize AC performance.
A short commute, low speed or lots of stop-and-go would completely change that. Oil cooler is really a track mod. I'm considering pulling it off my daily to optimize AC performance.
#402
Has anyone mounted a fan to their cooler? I've been considering ducting a cooler in but I'm space limited so I was thinking of mounting it to my undertray and slapping a temperature controlled fan to the 25row and having it kick on w/e temps get above a threshold (undetermined, maybe 225-250*?) - It's not ideal (fan had a 330 cfm rating) but certainly would be better than just leaving a cooler hanging with no ducting no?
Edit; This is the fan I was looking at. Unsure yet how control it yet though. $170 is a lot better than the Setrab vendors are selling the official 'kit' which includes a new radiator with it for ($400+)
Edit; This is the fan I was looking at. Unsure yet how control it yet though. $170 is a lot better than the Setrab vendors are selling the official 'kit' which includes a new radiator with it for ($400+)
Last edited by Der_Idiot; 08-24-2017 at 04:42 PM.
#404
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Do you have an oil temp sensor going to your hydra? Did your car used to have AC? If so you could probably use the AC fan wire to run that fan based on oil temps.
At least that is how I would do it on my Ms3.
At least that is how I would do it on my Ms3.
#405
Another idea I had was to place the oil cooler parallel with the ground (on top of the undertray) and cutting a hole in the tray and putting a small gurney flap in front of the hole to draw hot air down and out to below the car, but I don't want to overcool my car since we get some cold days up here. I just wonder how effective 330cfm would actually be though.
#409
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Ducting is usually the most common problem. All of the air that enters the bumper mouth must be forced to go through the radiator and not escape around the bumper cover into the wheel wells, underneath the car, or over the radiator. This usually calls for lots of plastic or metal paneling, sealing tape, and sometimes foam padding to block openings. It must be perfectly sealed. Stock cars fail on the street without proper ducting and undertray. Even more so on the track.
Beyond that a coolant reroute from 949 racing or similar will make a big difference. Additionally, sourcing a larger, competently designed radiator from them or from track speed will take you the rest of the way there with a stock engine. But none of this is any good without sealed ducting. Once you have sealed ducting, a reroute, and a properly designed radiator you should not see any overheating ever at stock power levels. I didn't need an oil cooler in the Florida heat on track until I reached the top side of 200 horsepower with a turbo.
What oil are you using?
#410
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We run a Champ/Chump car with a refreshed BP4W in an NA running an OEM radiator. All our races are in the Southeast (KY, GA, FL). Four things we do to keep oil temps down.
1. Use the factory oil cooler. Contrary to what most people think, they do work to keep the oil temps down after warm-up.
2. Coolant reroute. The cooler the water temp is, the cooler it'll keep the oil temp.
3. Ducting. Same as No. 2, more efficient radiator = less heat in oil.
4. Don't over fill the oil! If you're motor is burning/loosing oil, fix or rebuild it. We've seen a 10-15° increase in oil temps when we've added even as much as .5qt of oil more than needed. It whips the oil up and reduces its heat capacity.
1. Use the factory oil cooler. Contrary to what most people think, they do work to keep the oil temps down after warm-up.
2. Coolant reroute. The cooler the water temp is, the cooler it'll keep the oil temp.
3. Ducting. Same as No. 2, more efficient radiator = less heat in oil.
4. Don't over fill the oil! If you're motor is burning/loosing oil, fix or rebuild it. We've seen a 10-15° increase in oil temps when we've added even as much as .5qt of oil more than needed. It whips the oil up and reduces its heat capacity.
#412
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We run right at top of the stock dip stick (presumed to be the matching one to the motor). We usually burn/loose a little oil (.25qt or less) in a 2 hour stint. At the start of a race someone had added oil twice to the motor and we were seeing 250+ oil temps. As it burned down it the temps dropped to 230-240° which is right about normal for our summer races. We run Redline 5w30 Race. If the oil gets whipped up by the crank too much, it gets air bubbles in it which don't transfer heat as well (at least that's the theory I was told).
#413
SIXSHOOTER. Thanks for your thoughtful response. We do not have ducting and are running the stock radiator. Lost both motors due to rod/bearing failure. One at High Plains and the other at Hallett. Car owner runs various oil brands, generally a 10w40 weight.
Last edited by WRLracer; 12-19-2017 at 03:36 PM. Reason: Add response
#414
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Ducting, reroute, bigger radiator, proper oil, problem solved.
If you are racing you should be using racing oil. It won't solve the problem by itself but it can be a little more forgiving when the temps get out of normal operating range.
If you are racing you should be using racing oil. It won't solve the problem by itself but it can be a little more forgiving when the temps get out of normal operating range.
#415
Car is basically stock w/o oil cooler or "big radiator". Also starting a build on a second car for the same purpose.
SIXSHOOTER. Thanks for your thoughtful response. We do not have ducting and are running the stock radiator. Lost both motors due to rod/bearing failure. One at High Plains and the other at Hallett. Car owner runs various oil brands, generally a 10w40 weight.
SIXSHOOTER. Thanks for your thoughtful response. We do not have ducting and are running the stock radiator. Lost both motors due to rod/bearing failure. One at High Plains and the other at Hallett. Car owner runs various oil brands, generally a 10w40 weight.
First step is to definitely add one. Trackspeed sells a kit with various setrab cores which appears to be very inexpensive for the components you are getting, so much so that its basically a no brainer rather than piecing all the parts yourself.
As said, dont bother removing the OEM oil cooler/warmer unless its rotten or something.
TIL about running high oil levels.
#416
A lot of Spec Miata racers run 20W racing oil at the bottom of the dipstick to keep it from frothing, and have no troubles maintaining pressure with oil that light, and an oil level that low. I run mine halfway between L and F. If I run it any higher than that, the balance ends up in the catch can under track forces.
Since I just track my (normally aspirated) car for fun and don't have to follow any rule book, I put the equivalent of a Trackspeed oil cooler kit in front of my radiator. Between that and the Koyo radiator (with proper ducting and sealing), I see a peak coolant temp of 208F and a peak oil temp of ~230F in the Texas summer heat. For oil, I run Mobil 1 0W40 and drain it every 8 track hours, but if I were actually racing, I would use a proper racing oil.
If you are running only 1 fan, you can put a large cooler, like an 11x11 Long TruCool, behind the radiator and utilize the fan mounts and save a little money. Racer Parts Wholesale sells inexpensive kits based on Mocal, Aeroquip, and Long parts.
.
Since I just track my (normally aspirated) car for fun and don't have to follow any rule book, I put the equivalent of a Trackspeed oil cooler kit in front of my radiator. Between that and the Koyo radiator (with proper ducting and sealing), I see a peak coolant temp of 208F and a peak oil temp of ~230F in the Texas summer heat. For oil, I run Mobil 1 0W40 and drain it every 8 track hours, but if I were actually racing, I would use a proper racing oil.
If you are running only 1 fan, you can put a large cooler, like an 11x11 Long TruCool, behind the radiator and utilize the fan mounts and save a little money. Racer Parts Wholesale sells inexpensive kits based on Mocal, Aeroquip, and Long parts.
.
Last edited by Steve Dallas; 12-20-2017 at 08:14 AM. Reason: Stoopid phone
#417
Thanks everyone. This confirms what I have believed. It is not just one thing but a few details. It is the Miata way. We typically see 250+ oil temps and 210 to 215 coolant. And we run for 8+ hours this way. I will pass this along to the owner (I am just the wrench).
Is there any advantage to eliminating the piston squitter's in a na motor? What disadvantages?
Is there any advantage to eliminating the piston squitter's in a na motor? What disadvantages?
#419
We run right at top of the stock dip stick (presumed to be the matching one to the motor). We usually burn/loose a little oil (.25qt or less) in a 2 hour stint. At the start of a race someone had added oil twice to the motor and we were seeing 250+ oil temps. As it burned down it the temps dropped to 230-240° which is right about normal for our summer races. We run Redline 5w30 Race. If the oil gets whipped up by the crank too much, it gets air bubbles in it which don't transfer heat as well (at least that's the theory I was told).
A lot of Spec Miata racers run racing oil at the bottom of the dipstick to keep it from frothing and have no troubles with an oil level that low. I run mine halfway between L and F. If I run it any higher than that, the balance ends up in the catch can under track forces.
Since I just track my car for fun and don't have to follow any rule book, I put the equivalent of a Trackspeed oil cooler kit in front of my radiator. Between that and the Koyo radiator (with proper ducting and sealing), I see peak coolant temps of 205 to 208F and peak oil temps of 230F in the Texas summer heat. For oil, I run Mobil 1 0W40, but if I were actually racing, I would use a proper racing oil.
Since I just track my car for fun and don't have to follow any rule book, I put the equivalent of a Trackspeed oil cooler kit in front of my radiator. Between that and the Koyo radiator (with proper ducting and sealing), I see peak coolant temps of 205 to 208F and peak oil temps of 230F in the Texas summer heat. For oil, I run Mobil 1 0W40, but if I were actually racing, I would use a proper racing oil.
I usually take a few readings and if one of them looks like the oil is between MIN&MAX I pray that it's correct.
Not sure if this is a Mazda thing, my SP23 is hard to read too - never had issues with other manufacturers.
Given how sensitive rotary engines are, you'd think that Mazda of all companies would have idiot-proof, easy-to-read oil dipsticks!