I was going to plumb in a another oil cooler near the back of the car. since I have all this space where the other exhaust tip would be.
Any guesses on what kind of oil pressure loss I may see?

significate it maybe--be careful with that
od

And here I thought I was the King of Overheating.

Anyway,, my latest engine has about 30,000 miles on it. It (the car) has been overheating since the three prior engines. The new engine is from Japan, not a REMAN. It (latest engine) has been overheating in the summers down here since the temps hit 105 degrees and up for the last year and a half.
Recently (a couple of weeks ago) MM and I did a compression test on the car. After we visited Phil and did his. I was concerned that the same thing might be happening to mine.
Well,,,, we did the compression test, did the rpm calculations and the end result was,

120psi across the board. Go figure. This is an engine that has seen temps (recorded) as high as 243 degrees. And more than likely higher.

So it baffles me to see an engine like Phil's fail at 15,000 miles.
I really find it hard to understand that overheating his car has caused low compression.
I don't have the cooling upgrades that Phil has, BHR Rad, Mazmart waterpump. I have kept mine stock in the cooling dept for warranty reasons.

I feel that it is caused by other factors. I'm unable to determine what at this point. After we get it apart maybe it will become more evident.

So all you rocket scientists ponder that.

simple
overheating + FI = apex pwnage

Phil , what ratio were you premixing at and has your oil consumption been stable lately ? Thanks

Overheating is not going to effect the Apex seal. It's holding combustion gases already and is going to be hotter than the coolant already.
There is nothing the Apex seal is going to transfer the heat to. Apex will run just a bit under combustion temps.
Only thing that is going to cause Apex premature wear is a lack of lubrication.
Side seals also should be considered, but the only way for them to fail is to break. That didn't happen. End play against the corner seal? Have to be ALL twelve of them to have such even compression numbers.
So you are left with rotor housing grooving due to foreign material entrance through intake, or all six Apex seals worn down unevenly due to lack of OMP flow/spray.
Or it's a boost issue. Which I doubt.

I'm going with the Apex oiling scenario.

yeah - i'm thinking a lubrication issue more logical as well - hence the question .....

I started premixing at 1000 miles and used Pettit premix and their recommended 4oz to a tank, later I started using Idemitsu in the same amount per tank (4oz). I have been consistent with it's use and at that ratio thru today. My oil consumption thru the metering system has been inconsistent until I had the Cobb AP installed. That is one reason I went premix. When the car at 1000 miles did not conform to recommended oil use I started to premix immediately. The dealer at that time was going to talk to Mazda to find what caused the inconsistency but they closed up and left me with another dealer that was more antagonistic than helpful.

Phil, I know the compression test is the holy grale kind of thing , but what were your vacumn numbers and is the car idling ok?
This is strange. I have never heard of a 15k engine with low compression. Blown---yes. But not nearly equal-- low compression in all faces in both rotors. Even high milage ones usually have a face or 2 left that have fairly good compression.
It would be interesting to see if a pre mix of 2 oz per gal on a test run would make any difference.
OD

I can't tell you my vacuum numbers cuz I only logged the vacuum from the intake at supercharger cuz we were having that problem with the bypass valve and were trying to blame the terrible idle on it. Jeff or Ray may remember them but at the time we were sure the problem was the valve. The car presently idles very low and Jeff has trouble getting more idle RPM from it. It really picks up when boost enters the picture

The low mileage is the main reason we tried to blame my ongoing problems on other things. We did find problems elsewhere but they never fixed the main problem of the idle.

Can't hurt to try a one time trial of 2oz per gallon. Not real sure what that would prove but hell I'll try anything. I was the one in the group that thought the compression check was a waste of time, shows what I know.

Premix at 4 oz per tank is not enough to do anything helpful (especially given that you are FI'd) in my opinion .
If your MOP was playing up then there is a posibility that premix was the only lubrication you were getting at times so lack of lubrication does sound like the likely cause .
have a look at the oil delivery lines - are there any bubbles in the lines ?

His OMP is working (and jacked up via the AP).

I know it's pretty difficult to actually guage this but he did say it was inconsistent .......

the high amount of premix will not hurt anything for just a short run and if it helps seal --well the idle should be affected and you should be able to tell a difference in the engine. it will not cure anything.
od

It was inconsistent before the AP.
I would have a problem with the smog cops if I tried burning more than 4oz per tank. It smokes too much. Already tried increasing it and got stopped. Luckily he did not check for a cat but I had trouble explaining premix to him. The smog cops have no sense of humor.

perhaps the damage was already done :dunno:

I've put in as much as 20oz per tank (at the track) and didn't notice the smoke - not that I would I guess ....

Yeah, that is strange.
I've never gotten smoke from premix, either.

bingo.
make sure your dip stick is sealing:)
od

Your making it sound really bad - Are you sure you want to drive it back to Phoenix? :dubs: :rl:

What about oil cooler fans like the ones the guys use in Japan?

So with all that pre mix in there, what do your map readings read like? VS no pre mix?

do you mean my A/F ratios ?
I'm not sure what difference premix makes but I don't think it is significant .

This is a sad day for all 4-port AT's. I used to brag to everyone that I knew someone with a badass FI'd Tiptronic RX8 that killed Porches on the track. I hope it comes back better than ever.

:( me sad too...

any news Phil? I just added a second radiator -i will send you what i did if that could be of use to ya. you are in a different worls.
od

thats strange. like any others. I premix as much as 12oz for a long while and I never notice any increased in smoke. hmm

I use Idemitsu.