White steam / smoke coming out of crank case breather

[advinnie]

Hi all have a look at this video and tell me if you think I have a piston ring on it’s way out
The first video is of the breather after a five minute run and the second video is of the breather on first start up when cold
https://m.youtube.com/watch?v=2WkvyS351FU
https://m.youtube.com/watch?v=bD0-GwWcw6U

In the second video I had the engine engine running at just 500rpm

[jason]

New, rebuild? Do a leak down.

[advinnie]

The engine is a rebuild with new cam, pistons and barrows, pump and so on.
Unfortunately I don’t have a leak down test set so I will have to go buy one

[advinnie]

I can say that when I try and turn the engine over by hand you can fill all four cylinders have compression

[slalombuggy]

At this point it's not a question of is it on it's way out, but which one? I'd say you have a definite ring problem. You didn't use synthetic oil did you?

brad.

[thesatanicmechanic]

Details on the rebuild?

Piston and cylinder brand, bore, height group, ring end gap, etc...

Oil isn't way overfilled is it?

You could drive it and try to seat the rings, search "break in" on the site. That is a whole lot of blow by though.

[advinnie]

This is the Oil I’ve just https://www.flightstore.co.uk/aircraft-supplies-c8...J_EALw_wcB

I can’t give you much detail on the engine rebuild it wasn’t done by me
I have a friend coming round in a minute with a compression tester so I will post up my results. But I just want to make shaw I will be doing it right, I do it on a cold engine and crank it over with the throttle fully open?

[advinnie]

Right here are the results
Cylinder
1-124psi
2-122psi
3-122psi
4-126psi
If that’s good or bad I have no idea?

Next he done a leak check at 100psi
Cylinder 1 held 82psi
Cylinder 2 held 80psi
Cylinder 3 held 82psi
Cylinder 4 held 83psi

Once again I have no idea if that’s good or bad

[Pruneman99]

You need dino oil to break in the rings. Put some straight grade and try the ring break in procedure again. Hopefully the rings will set.

[clonebug]

My guess is you have cracked a couple pistons from detonation with your turbo setup.

If I were you I would pull it off the road now and replace the P/C's with new ones.
With that much blowby you are driving a time bomb.

CorysVDub blew his engine to kingdom come when he had that problem.

I pulled my engine and replaced my P/C's when I had a blowby problem also.
I could not see the cracks with the naked eye but I never pulled the rings to check there.

It fixed the issue and I have had no other problems since going FI and being able to control Fuel and timing.
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[advinnie]

I agree time to pull the engine and fit some more pistons 😡

[advinnie]

Is there any brand you would recommend?

[clonebug]

[advinnie]

I must say that at no point have I herd detonation and I’ve been very safe with the timing but shit happens

[advinnie]

Cast or forged pistons!

[clonebug]

[FeelthySanchez]

In spite of the consistent test result #s, that pronounced breather pulsing seen in vids pretty much pegs it - you've no compression seal on 1 cylinder.
Suggest trying the dino oil first - have nothing to lose.
As others have noted, some type of quiet exhaust would also help here.
G' luck!
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[advinnie]

Cheers all for your help/advice I will try a straight 30weight Oil first while I want for farther Christmas to bring me my forged pistons 😁

[advinnie]

Hi all after I post my compression last night I noticed that the compression gauge I was using was broken so went out and got a new one today and got a total different result.
The first figures are the cold cranking pressures and the second are hot cranking pressures
Cylinder 1- 117 & 128
Cylinder 2- 110 & 125
Cylinder 3- 50 & 68
Cylinder 4-120 & 129

No this is where I’ve got confused
After cranking for ten seconds I took the reading on the gauge and then left the engine for five minutes to see what the pressure drop would be and here’s them results
Cylinder1-went from 117 down to 109psi
Cylinder 2 went from 110 down to 104psi
Cylinder 3 went from 50 down to 47psi
Cylinder 4 went from 120 down to 114psi
This was done on a cold engine but if cylinder 3 is not making pressure due to bad rings how is it holding on to its pressure?
I was expecting cylinder 3 to drop its pressure very fast but it didn’t

[Floating VW]

I think it's not your cylinder that's holding pressure, it the one-way check valve in the compression gauge that's holding pressure.

So, no. 3 is the culprit. Nice catch.
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