Oil level increasing.

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Re: Oil level increasing.

Post by Shagrington »

Doblegota wrote:
Thu Feb 22, 2018 5:10 pm
Bad compresion!!

I did the compression test with the proper machine and results are really bad:
Front is 80psi and rear is 60psi at 250rpm.

How it’s possible these thing? With that numbers it should don’t start hot or worse things!
Was it a rotary compression test machine? You should have numbers for all three chambers on both rotors, so 3 readings for the front and 3 for the rear. I'm not sure if a non-rotary test machine is going to give an accurate picture.
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Re: Oil level increasing.

Post by qwakers »

it depends on how you use it but even if you use it as it comes out of the box it will still tell you the max psi over the 3 chambers...
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Re: Oil level increasing.

Post by PeteH »

Doblegota wrote:
Thu Feb 22, 2018 5:10 pm
How it’s possible these thing? With that numbers it should don’t start hot or worse things!

But it doesn’t. The car goes to 245km/h, from 0 to 204km/h (fourth gear limit) is brutal as normal renesis.
Yes, it is pretty amazing, isn't it! One reason Mazda won Le Mans was because the engine was nearly impossible to seize or break. Even with terrible compression at 250rpm you can still have good compression at 9000rpm. Most rotaries eventually fail because they won't start, not because they stop. In fact we have a UK member who recently took his very poorly car on a track day. It took about an hour to start it, but once it was going you would never have known...

As others have said, before you spend lots of money on a rebuild you should try to get a proper Mazda compression test done. It will tell you lots more than a normal compression test does, and will help you identify exactly what the issue is. You can post the six readings up on this forum, and people will be happy to give you advice on what they mean.
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Re: Oil level increasing.

Post by Doblegota »

Sorry, here it goes:

Front:

84.74. / 81.93 / 81.27 250rpm

Rear:

63 / 61 / 61 250rpm


The car never,never and never again make a misfire a bad start at any temperature. I had also forced starting in a click under 102°C. No problem.

Thanks for your help.

Really kind!
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Re: Oil level increasing.

Post by Doblegota »

Image

Dashcommand. Yesterday.
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Re: Oil level increasing.

Post by PeteH »

Thanks. So you have about 5.5bar on the front, and less than 4.5bar on the rear :shock:

Your motor is on the edge of not working. It is very even on all faces, so it looks like you may have badly worn or damaged housings.

You can just keep on running it, and keep dealing with the oil issues. But you are really close to rebuild time. :(

If your housings are badly damaged then it might not be a cheap rebuild either. :( :( But you won't know for certain until it is taken apart.
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Re: Oil level increasing.

Post by Doblegota »

Thank you very much.

How is possible it works like a normal car?

I had that pass of oil from the reservoir trough the sump, but now I don’t have it.

I use the car daily during the week and one day goes to time atack forcing the car to the limit in all gears.

I have sohn adapter
Fan control kit,
All ingniton system changed
Monitoring the car with dashcommand
Header, high flow cat but with original cat back exhaust.
All fluids are new,...

I don’t know if these things are making a miracle not letting the car die just today.

Probably if its damage I would buy another engine.

Till that day, I will continue as normal.

Thanks for all.
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Re: Oil level increasing.

Post by qwakers »

as explained rotarys will work for a surprising amount of time with surprisingly low compression.

https://www.racingbeateurope.com/bmazda ... -825-p.asp
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Re: Oil level increasing.

Post by Doblegota »

Thanks a lot for the link.

Kind regards.
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Re: Oil level increasing.

Post by Doblegota »

So, as I show what’s on my car I want to ask to you if there could be a relation between these numbers and what I found when I bought the car.

Normally there is always a minimum of things to see if a car it’s o not in good conditions such as starts cold/hot, mileage and manteinence.

When I bought the car there was no problems and now 10.000 km after you would never imagine those badly numbers in compression test.

When I bought it, it came with the original cat gutted out. The connection wire of the second
lambda is burned by overheating.

I didn’t know nothing about consecuencies of clogged catalytic converters. But after a year learning about cars and specially a renesis I think that what happened to that clogged cat it’s directly pointing to a overheating engine.
Could be so worst?

My driving conditions is according to a renesis habit and yes: 10.000km with that compression numbers.

Amazing car.
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Re: Oil level increasing.

Post by PeteH »

That makes sense.
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Re: Oil level increasing.

Post by Doblegota »

I want to ask also if I decide to buy a engine with a Street port (normal) what’s needed to optimize that new ported engine?

Sorry to disturb you so much.

Kind regards.
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Re: Oil level increasing.

Post by PeteH »

No problem. Ask away!

A street port is a mild form of porting. The Mazda ECU is more than capable of making the small adjustments to fuelling that are needed. So the answer to your question is that you don't need to do anything at all :thumleft: Just fit the engine and go.
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Re: Oil level increasing.

Post by Doblegota »

Oh! That’s nice!

I have seen that racing beat offers two street port modifications: mild an aggressive or large.

My idea was that: if it worth it or not for a Daily car.
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Re: Oil level increasing.

Post by qwakers »

you can never have too much power :)
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Re: Oil level increasing.

Post by Doblegota »

I know that, but I’m thinking if increases a lot fuel consumption.
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Re: Oil level increasing.

Post by qwakers »

i wouldnt think itd make much difference. rx8s are so thirsty, youre not gonna notice if its a vit worse lol.
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Re: Oil level increasing.

Post by Dazza44 »

Mine is street ported can't say notice any higher fuel consumption, let's face it that's allready awful

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Re: Oil level increasing.

Post by Doblegota »

AJjajajaj

Really kind your comments. Thanks.

My driving methods only alouds me 220km per tank.

I don’t want to do 150!!! Ahhahahajaha
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Re: Oil level increasing.

Post by ChrisHolmes »

PeteH wrote:
Thu Feb 22, 2018 6:40 pm
Doblegota wrote:
Thu Feb 22, 2018 5:10 pm
How it’s possible these thing? With that numbers it should don’t start hot or worse things!

But it doesn’t. The car goes to 245km/h, from 0 to 204km/h (fourth gear limit) is brutal as normal renesis.
Yes, it is pretty amazing, isn't it! One reason Mazda won Le Mans was because the engine was nearly impossible to seize or break. Even with terrible compression at 250rpm you can still have good compression at 9000rpm. Most rotaries eventually fail because they won't start, not because they stop. In fact we have a UK member ( that would be me) who recently took his very poorly car on a track day. It took about an hour to start it, but once it was going you would never have known...

As others have said, before you spend lots of money on a rebuild you should try to get a proper Mazda compression test done. It will tell you lots more than a normal compression test does, and will help you identify exactly what the issue is. You can post the six readings up on this forum, and people will be happy to give you advice on what they mean.
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Re: Oil level increasing.

Post by qwakers »

ahem....
Doblegota wrote:
Thu Feb 22, 2018 9:24 pm
Sorry, here it goes:

Front:

84.74. / 81.93 / 81.27 250rpm

Rear:

63 / 61 / 61 250rpm


The car never,never and never again make a misfire a bad start at any temperature. I had also forced starting in a click under 102°C. No problem.

Thanks for your help.

Really kind!
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Re: Oil level increasing.

Post by Doblegota »

PeteH wrote:Thanks. So you have about 5.5bar on the front, and less than 4.5bar on the rear :shock:

Your motor is on the edge of not working. It is very even on all faces, so it looks like you may have badly worn or damaged housings.

You can just keep on running it, and keep dealing with the oil issues. But you are really close to rebuild time. :(

If your housings are badly damaged then it might not be a cheap rebuild either. :( :( But you won't know for certain until it is taken apart.

Happy new year people!

Lot of months ago I decided to stop the car after these comments.

Now, learning and reading I decided to open the engine and I did all my self.

I will send you pics of what I found if you don’t mind.

I have to say that it’s a pleasure working these engine and technologies!!

Bye bye!


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Re: Oil level increasing.

Post by Doblegota »

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Re: Oil level increasing.

Post by Doblegota »

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Re: Oil level increasing.

Post by Doblegota »

76.000km
Evolve edition 2006.
LHD.


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