BlaCkPlaGUE

I was reading reteds site, once again, checking out his upgrade guideline. He goes through different stages for increasing power, telling you what you'll need to do and the projected hp.
ANyways, one of the mods was an oil pressure mod, basically making it higher.

Now he explains very clearly that this is needed with higher HP applications becuase of the increased power on the engine. Adjusting the oil pressure to be higher makes it so the engine cools better.

What are the disadvantages of this? I mean if there were only pro's, mazda would have done this from the start.

I can think of a few, but im not sure, so this is where you can correct me

1) You would burn more oil? The higher pressure could cause the oil to pass through the oil seals on the rotors more than normal?

2) Your turbo seal could blow? The turbo that comes stock with the seven is designed for a specific oil pressure, and increasing it will cause oil to pass through the seal, and possible blowing it out. Resulting in lots of smoking and/or a blown turbo.

Anything else? please correct me if im wrong, trying to learn here

thx

scathcart

Higher oil pressure causes a larger parasytic loss to the engine at the oil pump and induces more foaming to the oil.

Other than that, no real disadvantages.

1. I've run up to 135 psi oil pressure with no extra smoking on the engine.

2. You would need to check the oil pressure at the turbo charger and choose an appropriately sized oil restrictor to prevent blowing oil past the turbo oil seals.

BlaCkPlaGUE

What is the stock oil pressure for the second gen? and would the turbo be the same, or do the turbo engines have a stock oil restrictor?

thx

scathcart

65-70 psi peak is stock.
you need 10 psi for every 1000 rpms. Stock redline is 7000... make sense?
FD regulator is $26 and is around 110 psi peak.

Are you going to be running a stock turbo on this engine, or an aftermarket turbo? Stock turbo restrictor is inherent to the turbo and its feed line.

BlaCkPlaGUE

Im not running anything at the moment. Im just gaining better understanding thats all, you've helped me achieve that

scathcart

Next ask me how to get any oil pressure you want for $10.

BlaCkPlaGUE

How do I get any oil pressure I want for 10$?

scathcart

Same way you build an manual boost controller.
Grind the end off the OPR, weld a nut on the end, then put a bolt in the end with a jamnut.

Turn the bolt, spring tension increases, higher oil pressure.

Same way they build the MFR OPR, only you're using the stock spring. It works great.

BlaCkPlaGUE

Im pretty sure I know what your talking about. Can you show me a pic of the stock OPR?

scathcart

I'll snap one when family guy/american dad is over.

so... 65 mins.

micah

Resurrecting this thread... although, from the look of it ^^^^ it didn't end with a picture.

However, I just read a comment from RETed in the "building the best 13b ever" thread about how high oil pressure causes excessive smoking. I had planned oil mods on my upcoming build... but having read that, it got me to searching.. and this thread.

So. RETed (a wise and powerful rotary genie) has concerns about oil mods when they aren't NEEDED. Has anybody else experienced this excessive smoking? Was the excessive smoking on an engine with highly controversial viton oil o-rings?

I have two rear OPR's, one of which I modified with the shop-press method of crushing the end. Worked great. Holds about 85-90psi (tested with air). The other I kept stock incase I decide against this. My plan was to use the modified one and shim the front regulator to around 90psi. For the oil pump I WAS going to buy a TII replacement as its a bolt-on upgrade (I use the term upgrade loosely).

During the rebuild, I'm using brand new oil control rings and mazda oil control o-rings. Does anybody forsee any "excessive smoking" or other such issues with this?.

Car: 1991 NA. Fully stock. Rebuild will be street ported, but thats about the extent of the engine mods.

Thanks in advance for any help.

--Micah

micah

Well, I've done some more searching, and haven't turned up any more results... I figured this would be good information to have for lots of people considering oil mods.

classicauto

iTrader: (3)

IMHO, you don't need higher oil pressure unless you're running higher revs.

I'm sure using an FD regulator wouldn't hurt since an FD engine would cope with that specific pressure just fine.

But as long as the oil system is working properly your engine is being lubed and cooled. What more can you ask for?

Again, all my opinion so take it as you like.

micah

My goal is to simply have a higher level of protection in my engine..... If the stock 60psi (I think) NA oil pump is enough, then I suppose I'll leave it stock.