Originally Posted by Savington (Post 803638)

1. Leakdown the motor, if you have anything worse than 20% leak at the rings you have a blowby issue

2. Assuming your motor is healthy, you should be able to hook the factory PCV hose up to the intake manifold, run a breather on the driver's side, and have no oil consumption/blowby issue.

In reality, I'm expecting you to fail test 1. If you have issues filling cans on the highway, you have motor issues. Road course cars are a little different but for street turbo cars, you should be able to run the factory PCV setup with no issue.

Originally Posted by Clos561 (Post 803650)

I have a similar issue but i dont have a catch can. I notice minor oil residue coming from the base of the oil cap(def not enough ti fil a soda can). I have a breather in driver side. Sav you know why this is happening?

Originally Posted by Slacker2223 (Post 803694)

what is with that first IC pipe?!?! its almost a 180 degree turn in like a 3 inch area.

Originally Posted by Slacker2223 (Post 803695)

also it looks like you are running a breather filter on your idle valve. those are known to leak under boost. route that back into your cold side IC piping.

Originally Posted by 94mx5red (Post 803777)

Carlos, are you frequently in the Northlake/Coconut area? Pretty sure I have seen you running around the acerage.





Pretty sweet, right? :giggle:

That originally went from the turbo inlet to the air filter. It just so happens to fit well here too. It is a Begi piece from the S kit.



Oh yea... I remember reading about that a while ago, and promptly forgot to do anything about it.

Originally Posted by Savington (Post 803638)

1. Leakdown the motor, if you have anything worse than 20% leak at the rings you have a blowby issue

Originally Posted by Clos561 (Post 803849)

i have a few friends out there but i live in royal palm beach. la mancha to be exact. you?

Originally Posted by 94mx5red (Post 804679)

I am up in Stuart, but I am doing all the work at my family's house in the acerage.

Know anyone that wants to buy a miata with blown rings? I have a spare low milage 95 engine to go with it. turboz not included.

Originally Posted by Savington (Post 804773)

With the leakdown tester hooked up, take the oil cap off and listen for air in the oil cap, through the intake, and out the tailpipe. At 30+% one/all of them will sound like a very, very leaky air compressor fitting.

Oil cap = rings
Exhaust = Exh. valves
Intake = Int. valves

If you hit the wrong TDC, the leakdown will be ~45%. If you get 45%, spin it over again and try again. Then go 1-3-4-2 from there.

Your numbers (assuming its rings) would probably produce blowby, yeah. It's time for a shortblock.

Originally Posted by 94mx5red (Post 805926)

I have never pulled an engine on a miata, and only once before in my life. Is the general consensus that I take the transmission out with it?

Originally Posted by 94mx5red (Post 805988)

To add, I will be doing this alone.

Originally Posted by savington (Post 804773)

with the leakdown tester hooked up, take the oil cap off and listen for air in the oil cap, through the intake, and out the tailpipe. At 30+% one/all of them will sound like a very, very leaky air compressor fitting.

Oil cap = rings
exhaust = exh. Valves
intake = int. Valves

if you hit the wrong tdc, the leakdown will be ~45%. If you get 45%, spin it over again and try again. Then go 1-3-4-2 from there.

Your numbers (assuming its rings) would probably produce blowby, yeah. It's time for a shortblock.

Originally Posted by muoto (Post 824160)

I found a leakdown tester and just tested all the cylinders

First I did compression test:

1# = 190 psi
2# = 190 psi
3# = 185 psi
4# = 190 psi

and then leakdown test:

1# = 4% leak
2# = 50% leak
3# = 11% leak
4# = 6% leak

cyl 2# didn't seem normal so I did it again and it was over 80% leak. I remove the exhaust manifold and could feel how air was escaping through

Ex.valve(s) stuck or..?

Originally Posted by hornetball (Post 824481)

Bottom line:

Compression Test = Waste of Time

BTW, Fae discoverd that even if you don't disconnect everything, the car has an "auto-disconnect" feature as you rip the engine/tranny out. So, no worries.

Originally Posted by Savington (Post 824267)

Bent valve or a major seat issue. The last motor I leaked at 75% turned up compression numbers in the ~100psi range and ran on 2, maybe 3 cylinders.

Originally Posted by 94mx5red (Post 804245)

I kept out of boost and speed down to 75mph, and it still puked oil.


Harbor Freight was the only place I could find a leakdown tester unless I wanted to order online. This is the exact one that I got. Feels cheap.

https://www.miataturbo.net/attachmen...ine=1323434683


I tried it last night, and quit when the mosquitoes got bad. This was my first attempt ever, and I think I screwed up. I did not put the car in gear after finding TDC.

Here is the method I used:
- disconnect battery
- pull plugs and wires
- find TDC for #1
- test
- went to TDC from cylinders in order 1 - 3- 4 - 2
- did not put car in gear

First round:
1: 63
3: 29 ; 30
4: 59 ; 70 ; 65
2: 20 ; 21

Second round:
1: 22 ; 34 ; 53 ; 100
3: 27 ; 34 ; 37
4: 26 ; 22
2: 39 ; 33 ; 24

Third round:
1: 40 ; 100 ; 37 ; 37
eaten alive


I am guessing that these may be mostly useless since I did not lock the engine from spinning.

I will try again on Saturday.