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Old 08-02-2010, 10:44 AM   #1
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Default Accusump, discuss it here.

Sooooooooo I thought we needed an Accusump thread.

I'll start:
Do I need a 1-way valve if I'm hooking-up to my oil cooler lines at the sammich plate? Essentially the oil's path will be: pump-plate-cooler-filter-[accusump line]-plate-then through the engine on its path to glory.

I don't understand why I need the 1-way valve because if the oil pump is turning I assume that any oil left between the pump and the Accusump hose will maintain pressure.
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Old 08-02-2010, 12:00 PM   #2
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Thank you Hustler, we do need this thread, we need it stickyed, and we need a lot of these kinds of simple questions about it answered. I was going to start one myself but I'm never going to have the $$$ to dump into something like this. I will email Keith at FM and ask him to jump in about the Trackdog's setup, it's one of the few Miatas I know that's ran one.

For those of you just joining us, there's a lot of good information in this thread about DIY oil pan baffling, and some great information/proof as to why a raced Miata needs an Accusump system.

https://www.miataturbo.net/race-prep-75/extra-baffling-oil-pan-49230/
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Old 08-02-2010, 12:50 PM   #3
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My understanding of the check valve, is that it is there to keep the oil reserve from backfeeding to the oil pump. If oil is forced back towards the pump, air can be trapped at the pump, and it could slow down picking suction back up from the pan, and then the accusump could run out of reserve before flow again starts. Also if you use the system to prelube the engine before startup, oil could backfeed to the pump, and not to the bearings, and turbo, where you want it. These may or may not be of major concern, some systems just plumb into the oil passage in the block, not at the filter, and do not use a checkvalve. If possible, I would use one.

Ron
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Old 08-02-2010, 01:53 PM   #4
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Good thread Idea.

I’m definitely doing this in the near future. Too short on cash right now. I’m having to rebuild my 2.0L again because of failure and am currently running a backup motor and trying to stay in tires for the autocrossing and Go-Cart track time attack I’ve been getting into lately. The car is still pretty stupid fast with stock internals from a 94 Protégé for now.

Bob
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Old 08-02-2010, 01:55 PM   #5
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the way i see it if the pump is turning full time then you will have flow full time barring the pump malfunctioning. You dont see 1 way check valves on fuel systems do you? exactly you should be fine.
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Old 08-02-2010, 02:01 PM   #6
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If you want to pre-oil your engine before starting, you need stored pressure in the tank. And that means you need a valve. They're not check valves, but most commonly a ball valve that is closed before the engine is shut down. When the engine is running, the valve is left wide open. A check valve would prevent the accusump from dumping the oil into the engine or refilling, both of which would be bad.

However, Accusump does recommend a check valve when used in conjunction with an oil cooler, probably to ensure the oil isn't used to refill the cooler under starvation conditions. I can see how the Accusump could discharge its complete oil load just to refill a cooler. Install instructions

Curly asked me to chime in with location, dos and don'ts, etc. I'll contribute what I can, but SCCA racers have a lot more experience with these. I'm pretty sure they're legal in Spec Miata. One thing about living with an Accusump is that the oil inside can get pretty nasty. You'll want to disassemble it and clean it out at every oil change. You also want to make sure the piston inside can move freely. This is pretty easy to do, and it needs to be done.

As for location, well, wherever it fits You should be able to mount the device in just about any orientation, which usually means lying down in a Miata. We mounted the one in the Track Dog both horizontally (first year) and vertically (second year), but the stripped interior of that car gave us more options. You do want to make sure the oil lines are kept relatively short to minimize pressure loss and the air valve and gauge are readily visible.

I'm not running one on the Targa car due to the nature of the event - you don't tend to get lots of long high-g sweepers.

Last edited by curly; 08-02-2010 at 05:17 PM.
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Old 08-02-2010, 03:53 PM   #7
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Keith,
Can you please confirm which port "feeds" the oil cooler?

(I guessed left)

Also, what are your thoughts on stacking this cute little guy from Canton on your sandwich plate?


I'm about to order one and want to put it in the trunk. I could save some money by putting it behind the passenger seat, but I don't like the logic of hot oil in the car.


Thanks for participating.
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Old 08-02-2010, 04:13 PM   #8
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If the machined side facing us goes towards the filter, then yes, the left side will go to the cooler and the right side would be the return. If the machined side goes towards the block, it's the other way around. Basically, the center hole is the return from the filter to the block.

I don't know what that cute little guy from Canton is. You'll want to avoid stacking TOO many sandwich plates due to clearance in the engine bay.
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Old 08-02-2010, 04:16 PM   #9
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Quote:
Originally Posted by [email protected] View Post


If the machined side facing us goes towards the filter, then yes, the left side will go to the cooler and the right side would be the return. If the machined side goes towards the block, it's the other way around. Basically, the center hole is the return from the filter to the block.

I don't know what that cute little guy from Canton is. You'll want to avoid stacking TOO many sandwich plates due to clearance in the engine bay.
Its a sandwich plate with one port for the accusump feed. I'm trying to avoid the daisy-chain of fittings on my sandwich plate.
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Old 08-02-2010, 04:22 PM   #10
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My only contribution to this thread- Seemed like a decent place to mount the can-

http://forum.miata.net/vb/showthread.php?t=387905
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Old 08-02-2010, 05:14 PM   #11
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I was thinking of trying to mount it around where the fuel pump is somewhere. Thing is It seems like it would be a good Idea to have the air gage visible to the driver so you could see if it was charged or watch it discharge etc. I wonder about remotely mounting the air pressure gage in driver view.

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Old 08-02-2010, 05:23 PM   #12
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Doesn't the muffler location kind of fail on three account? Heated from the exhaust, can't see the gauge, and the lines are super long? My .02 cents.

If I had the money it'd be the passenger floor with a simple aluminum heat shield on the driver side and top, to keep my mind at ease about leaking fittings and the like.

Hustler, the plate you showed appears to have four ports, two for Accusump and two from an oil cooler? Care to elaborate, and share a location/price?

Thanks very much for chiming in Keith, greatly appreciated.
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Old 08-02-2010, 05:45 PM   #13
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We mounted it on the rear parcel shelf our first year. I don't think the gauge needs to be visible during normal operation, but it's a good pre-flight check. The only problem with having it visible is that every kid with their hat on crooked will think it's naws It wouldn't be hard to put the air pressure gauge on a hose though.

I can't say I'm overjoyed about under the trunk, pre-warmed by the exhaust.

If I were installing one today, I'd be tempted to put it at the front of the passenger's seat but I'm not sure there's enough room there.
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Old 08-02-2010, 06:07 PM   #14
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What about vertically behind the passenger seat? I have a track seat over there and it might fit.
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Old 08-02-2010, 06:18 PM   #15
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Quote:
Originally Posted by curly View Post
Hustler, the plate you showed appears to have four ports, two for Accusump and two from an oil cooler? Care to elaborate, and share a location/price?
look at the black plate. One port for the hose.
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Old 08-02-2010, 08:31 PM   #16
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Quote:
Originally Posted by hustler View Post
look at the black plate. One port for the hose.
Do you need both plates? I'm confused as to why you said you might, since as I said, it looks like 4 ports, oil cooler in/out, and Accusump in/out. Or is that left port on the side not actually a port?
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Old 08-02-2010, 09:56 PM   #17
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One threaded port to feed the plate, that's all.
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Old 08-02-2010, 10:31 PM   #18
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Quote:
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I'm not running one on the Targa car due to the nature of the event - you don't tend to get lots of long high-g sweepers.
Miatas don't oil starve in high-G sweepers, though. They starve under hard braking.

The pressure drop with a long hose length is easy to combat - you simply place the two way valve as close to the engine as you can get. The line remains pressurized with the tank.

Accusumps are 100% illegal in Spec Miatas as well.
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Old 08-02-2010, 10:36 PM   #19
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Quote:
Originally Posted by Savington View Post
Miatas don't oil starve in high-G sweepers, though. They starve under hard braking.
If this is true.. then what is the real benefit of an accusump system? It seems that some well thought out baffling would solve the problems. Or are you all doing this just for the safety net?
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Old 08-02-2010, 10:46 PM   #20
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The safety net idea isn't a bad one, since **** can happen. I have a 20psi low OPG light on my car and the only times I've ever seen it come on were under hard braking. Turn 9 at Thunderhill, turn 3 at Calspeed specifically. If 160mph through 1 and 2 at Calspeed doesn't starve the stock oil pan/pickup, nothing will.
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