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-   -   Why did my rebuild fail? (https://www.rx7club.com/3rd-generation-specific-1993-2002-16/why-did-my-rebuild-fail-1018474/)

FC3Sdrift 11-26-12 03:18 AM

I still want too know what he used to seal the front cover, if he plugged the hole for the omp feed that would be the reason

RotaryEvolution 11-26-12 09:17 AM


Originally Posted by thewird (Post 11297041)
Then the boost gauge is probably hooked up incorrectly.

thewird

or it's not quite "healthy", those figures are for a near perfect condition which is what i consider "healthy" in the 120-130psi compression range. most engines aren't in this range nor will be unless using new housings for rebuilds, cutting them or just have low mileage or have never been abused.

most cars will idle in the 15-18"Hg range and still drive rather normal, have between 90 and 120psi of compression and last a good long while without any real problem.

thewird 11-26-12 01:06 PM


Originally Posted by RotaryEvolution (Post 11297581)
or it's not quite "healthy", those figures are for a near perfect condition which is what i consider "healthy" in the 120-130psi compression range. most engines aren't in this range nor will be unless using new housings for rebuilds, cutting them or just have low mileage or have never been abused.

most cars will idle in the 15-18"Hg range and still drive rather normal, have between 90 and 120psi of compression and last a good long while without any real problem.

He said its pulling 0"Hg lol. If a seriously blown engine will have some vacuum lol.

thewird

yourmom23 11-26-12 06:39 PM

That would make sense but it did have 4 quarts and then i added 4 more is thare a way to check to see if the omp is working correctly.

thewird 11-26-12 06:40 PM

You can normally check by seeing if the lines have oil in them and are flowing.

thewird

Copeland 11-27-12 03:06 PM

In for pics.

cewrx7r1 11-27-12 06:47 PM

Many reason for new engine failure.
Improper assembly even if all parts were perfect.
Initial startup lubrication failure.
Reusing older parts that should not be used.

yourmom23 11-28-12 06:03 PM

7 Attachment(s)
Motors current dwelling place

Attachment 690173

Attachment 690174

Attachment 690175

Attachment 690176

Attachment 690177

Attachment 690178

Attachment 690179

Hard to take good pics but you can see that the housing arent really chipped just really grooved like they were grinding instead of sliding. I really think now that they were not getting proper lubrication. I used all new seals replaced a couple stationary gear bearings that were bad other than that all bearings were in good shape.

yourmom23 11-28-12 06:12 PM

FC3Sdrift pretty sure i used, silicone. So it may be the reason but i think i already cleaned off the stuff i will look at the pump cuz i dont think i cleaned it yet. I did use a good amount of oil on the inside of the motor when i assembled it. I was pretty damn precise when i assembled it doing everything the video said to the t.

yourmom23 11-28-12 06:20 PM

So i looked at the oil metering pump and front cover and didnt see any silicone blocking anything, maybe the omp lines got kinked or somthing i am goin to take the covers off and look for kinking.

seandizzie 11-28-12 07:49 PM

Were the intake ports stock? Improper porting will sharpen the side seals and cut grooves in the sideplates.

yourmom23 11-28-12 09:36 PM

they were done to the pineapple med port what part would sharpen them the outside being to far or the inside of the port. I know my insides were a tiny undersized just cuz i blended it to the machined edge, and the outsides matched the template.

yourmom23 11-28-12 09:44 PM

Just looked at the side seals they are pretty smooth a couple have some burring, but i feel like that could have been caused by the improper lubrication. It is so weird i swear the thing smoked more than it should have although it had no cat, but then when i look inside it looked like it was starved for oil.

SO WHAT COULD BE THE CULPRIT OF LOW OIL IN THE COMBUSTION CHAMBER???????

mono4lamar 11-29-12 09:30 AM

Pictures of the "burs" please. Where are they, at the ends/points or along the sliding face? Get us some pictures of the porting also. If you went inside the oil control ring sealing area we should be able to spot it. Also, even if you didn't go in too far you might have left a bur that could have worn the outer oil control ring down.

In reality its up to you at this point since you have the parts right in-front of you to take out the FSM and start measuring wear of the side-plates and the oil control rings. Something will show up...

Mrmatt3465 11-29-12 10:16 AM

Failed omp oil nozzle check valves can cause starvation.

mono4lamar 11-29-12 11:52 AM


Originally Posted by Mrmatt3465 (Post 11300915)
Failed omp oil nozzle check valves can cause starvation.

For any single turbo car I recommend an OMP system delete. The nozzles are extremely weak and do a very poor job of lubricating the "engine." Running 1/2oz per gallon of premix will do much more than the OMP can do.

yourmom23 11-30-12 12:10 AM

Well got all my fsm sheets printed out with my strait edge feeler gauge and calipers, so we will see what is in speck and not. The more i look at the rotor housings the more they look better there is almost no chipping but they just have a little surface grooving.

thewird 11-30-12 12:12 AM

Those housings will never generate good compression. Get them resurfaced by Goopy.

Check if your OMP check valves are working correctly.

thewird


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