oil presure
I have a 1987 rx7 sport. I get a high oil pressure on accelerating. I have been having this issue from the time I got my car. I blew it off due to my 1985 did that as well and I know rotary engine have a lot of movement in that area. I just changed the oil 5w-30 Castrol GTX and the oil filter to Wixs. Where should I start? Is it normal for a rotary?
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That is not normal operating pressure for your particular model.
Factory specs are approximately 30 psi at idle and 60 psi above 3k RPM. It is possible that yours may have been rebuilt and the regulator may have been modified, replaced with a later model unit or It could also just be the oil pressure sender, or oil pressure gauge reading incorrectly. Check the single wire connected to the sender. On yours it should be a slip on connector. Its known to get pretty nasty since its right underneath the filter. Clean the contacts and reattach it. Start the car and see what the oil pressure looks like at idle and above 3k RPM. If your oil pressure is indeed that high, I would recommend using a different oil filter with a higher burst rating. There is some data out there showing Wix/Fram filters bursting on RX-7's. What is the history on the car anyways? has this problem just started? Ever had it rebuilt? |
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Well this hurt anything? If so what? If it is modified I assume that the engine can handle that kind of pressure?
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oil presure
like savanna said, do you know any history on the engine? if its been rebuilt theres a possibility that theres been a mod done to the oil regulator
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That what I am asking if I do have a modified regulator could it hurt the engine? Why do they do that? I assuming (based on that there is a mod) that it can handle that presure?
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the spec is 71 max and not 60. i would bet that somebody didn't get the needle on correctly when they put the gauge faces on.
secondly, higher oil pressure is better. the FD runs 110psi stock |
Originally Posted by savanna.seven
(Post 11923536)
There is some data out there showing Wix/Fram filters bursting on RX-7's.
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From the time I have posted I replaced the oil filter with another and replaced the sender unit. There is no change. Is there a manual way to test it? Like volt meter on the sender? Just to make sure the Guage is reading right. What about the oil cooler? Or should I goto the regulator? How do I test that the gauge is working right?
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oil presure
all honesty, i wouldn't be so worried about it
like what was said above, whoever put the gauge faces on probably didn't get the needle put back on right and its set a little higher than it should |
Originally Posted by Erifx
(Post 11923701)
From the time I have posted I replaced the oil filter with another and replaced the sender unit. There is no change. Is there a manual way to test it? Like volt meter on the sender? Just to make sure the Guage is reading right. What about the oil cooler? Or should I goto the regulator? How do I test that the gauge is working right?
section 15 gives you the methods to test both the sender and the gauge |
Originally Posted by j9fd3s
(Post 11923717)
Foxed.ca - Mazda RX-7 Manuals
section 15 gives you the methods to test both the sender and the gauge |
Originally Posted by clokker
(Post 11923619)
Fram, sure, Wix, I don't believe it.
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Originally Posted by savanna.seven
(Post 11923536)
If your oil pressure is indeed that high, I would recommend using a different oil filter with a higher burst rating. There is some data out there showing Wix/Fram filters bursting on RX-7's.
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A 30 year old sender and gauge should not be relied upon for diagnosis.
Verify with an independent gauge before assuming there is an issue. |
^^Great advice from a great guy
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5w-30 is too thin of an oil in a rotary.
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Originally Posted by misterstyx69
(Post 11924235)
5w-30 is too thin of an oil in a rotary.
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Originally Posted by j9fd3s
(Post 11924251)
nonsense, every Rx8 ran 5w-20
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Originally Posted by diabolical1
(Post 11924278)
depending on where you stand on that point, one could take this as a way to prove or refute Styx's statement. :)
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Originally Posted by j9fd3s
(Post 11924289)
yeah i will grant you there are more oil related failures with the Rx8 than the Rx7, but the average Rx8 seems to have gone 80-100k miles without really getting any maintenance at all, so i think you can say 5w-20 is ok.
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Originally Posted by j9fd3s
(Post 11924289)
yeah i will grant you there are more oil related failures with the Rx8 than the Rx7, but the average Rx8 seems to have gone 80-100k miles without really getting any maintenance at all, so i think you can say 5w-20 is ok.
for the record, i was only being partially serious. i made my comment mainly because i just found your reply funny. it was more me sharing "the joke" than anything else. |
If I wanted to look into this what would I start with? Oil pressure realtor and oil cooler? What about the screen filter in the oil pan. Could that get cloged?
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Originally Posted by Erifx
(Post 11925815)
If I wanted to look into this what would I start with? Oil pressure realtor and oil cooler? What about the screen filter in the oil pan. Could that get cloged?
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I replaced the gauge, sender, and the oil filter. If anything it went up. I want to check in to seeing how to check with a non-electrical gauge. After that whats next?
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maybe the RB gauge adapter or something like it?
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Originally Posted by Erifx
(Post 11925864)
I replaced the gauge, sender, and the oil filter. If anything it went up. I want to check in to seeing how to check with a non-electrical gauge. After that whats next?
there are several things that both control oil pressure, and measure it. its usually a good idea to narrow down the culprits, in this case to the gauge side, or the actual oiling system. the gauge is easier, as we can put a resistor on it, and see where the needle goes, and then we can check the sensor on the engine the same way. if that doesn't work, next step is to verify the oil pressure in the engine, mechanical gauge, screws in place of the stock one. if oil pressure is STILL not right, then oil pan comes off, and there are two regulators. |
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