Miata Turbo Forum - Boost cars, acquire cats. - Engine hydrolocked from oil while cranking?

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- - Engine hydrolocked from oil while cranking? (https://www.miataturbo.net/engine-performance-56/engine-hydrolocked-oil-while-cranking-74142/)

I have run an extra quart without issue on the track so I don't buy that as the culprit.

Quote:

Originally Posted by FrankB (Post 1065465)

Well I put 4.5 quarts back into the motor after I drained it. Earlier posts in the thread said that I should have stopped at 4. I guess the PCV could have sucked some too but there's not telling for sure anymore. (Ugh.. This whole issue is just a nightmare I wish I could forget )

I would definitely replace PCV components and add a catch can or clear fuel filter in the line so that you can catch any issues before they bend another rod.

If the valve cover hasn't been modified, the PCV system shouldn't puke out enough oil to hydro lock a piston unless there was a lot of oil sitting on top of the head. Some ideas;

1. Engine had an excessive amount of blow by, slowing down oil draining back to the sump.

2. Excess oil escaping a cam bearing (or VVT system, if NB2 engine)

3. Oil drain back path ways to sump blocked

I don't see an extra half quart of oil causing any issues, let alone bending a rod.

Quote:

Originally Posted by noname4me (Post 1065989)

Yes, the PCV has been removed and both ports from the valve cover are enlarged to a -10AN and ran into a catch can with a manual drain.

I have also since then modified the passenger side(PCV) baffle to restrict the opening at the rear and tapped through the wall of the center baffle where the drivers side would pick up vapors. this is also completely reversible if need be.

Just to throw this out there. I was tracking a 20k mile MSM that had a 2871 on it. Going down the straight I look in the mirror and I'm James Bond smoke screening the track. Pull into the pits and let it cool off, 20 minutes later it runs fine and no smoke. This was in 08-09?, seem to recal people stating that the MSM catch can can puke the entire oil collected into the engine at random times under certain conditions. Scared the shit out of me as I was going 140 indicated, very weird catch can setup.

Quote:

Originally Posted by jacob300zx (Post 1065999)

I can't remember where it was but I read other posts like this related to the factory catch can pulling oil out of the pan and into the intake. Another reason I deleted the return and made my own catch can.

I'd still inspect those injectors/o-rings/seals just incase if you haven't.

Like you said, one of the only other things you did was pull the top half of the intake mani off and install those injectors. I know it really looks like oil, but it sure can't hurt to give the injectors a really hard look anyway. Good luck.