Blow by- bad honing?

[BCjohnny]

Plenty of good suggestions so far, so ........

Did the ring lands have wear, or more critically taper, when you installed the new rings ?

Nice parallel grooves, snug fit ?

Putting new rings in bad pistons is not as uncommon as some would give credit for ...... especially when you've convinced yourself they'll go again or aren't available ......

[rgalajda]

Is this an automatic transmission car?

The reason I asked if it was an automatic. Faulty trans modulator valve sucking fluid into intake manifold causing bluish smoke.?

[Dan Timberlake]

Close up pictures of the rings' faces ( cylinder side) might be revealing.

Did break-in include several short bursts of heavy throttle at mid revs ?

What is the rings' face materials, manufacturer and part number ?

[RW TECH]

As others have stated, make sure you do not have the second rings upside down.
If you try again you can use a flex hone in something more along the order of a 280 Grit and do about 10 strokes forward, then about five strokes backwards. Wash bores out really good & use a wash cloth of some kind with Dawn dish soap & water then after drying clean them with automatic trans fluid or Hoppes No. 9 gun barrel cleaner, then carb cleaner or acetone. Yes the flex hone will leave a good surface finish for most replacement-style rings as long as it is aluminum oxide and not too fine. Furthest I would go is a 320 grit and make sure what you are using is SNUG in the bore. No need to go to a machine shop for what you are trying to do.

You can have lots of ring to groove side clearance and it should not smoke as you are describing.

[Machtuck]

The .040 pistons in there do not have too many miles on them. I will say that they were quite dirty with carbon. I thoroughly cleaned all ring grooves and oil holes. I didn’t notice any anomalies or deformations.
The second ring is the only ring with a dot and they are all facing up. All ring lands look good.
The only seal that i was able to source was through Rock Auto- Enginetech S0629. I must had purchased the last one as they are now out of stock.
Yes, when i broke in cam, i always do throttle bursts for 30 minutes. It didn’t seem to smoke as bad in the initial start up as it did before i pulled it. In fact, the rear seal didn’t leak until the engine had about an hour on it. I’m actively looking for pistons as i would like to bore this thing .060.
I really appreciate the replies. If i cannot locate pistons, I’ll definitely do a thorough honing and see what happens.

[Machtuck]

8D84D5C5-F5AD-4D94-ADF7-C33230454258.jpeg

I tried to attach photo of cylinders.

[allencr267]

Did break-in include several short bursts of heavy throttle at mid revs ?

Yes, when i broke in cam, i always do throttle bursts for 30 minutes.

Under load, right??

Also,

...cleaned all ring grooves and oil holes. I didn’t notice any anomalies or deformations.

No scrapes, scars, scratches or burrs, lands just a nice flat smooth surface, perpendicular to the wall? Cleaning carbon with old rings has F'd a lotta pistons, when that carbon doesn't really have to be removed unless it doesn't let the ring fit into the cylinder.

[williamsmotowerx]

Put only oil rings on a piston and check how much force it takes to move in bore

[Tom68]

8D84D5C5-F5AD-4D94-ADF7-C33230454258.jpeg

I tried to attach photo of cylinders.

That's not really honed, have you measured the bores ?
You need it machine honed, but only if your pistons can handle the extra clearance.

Rear main leak unlikely to be from crankcase pressure.

[Dave Koehler]

I may have missed it.
Moly or cast top ring?
Type of oil used?

[rp930]

I see no crosshatch

[Machtuck]

Cast rings. Not just under load but at idle and when revved. Will try putting just oil rings on to check pressure. Will also re-measure cylinders.

[Machtuck]

Driven 10W30 break in oil.

[chevyfreak]

The 194 inline 6 uses same pistons as the 265 v8 from 50s.

Chevyfreak

I must apologize and correct myself.
Sorry for (my) the confusion. The 265 sbc pistons actually matches the 215 inline six that pontiac used. The 194 has a smaller bore, only same comp height.

Chevyfreak.

[rgalajda]

" I’m curious if my “quick hone job” is the culprit and would an inadequate hone job cause this much oil to get in the combustion chambers?? Maybe glazed cylinders?? If i could find .060 pistons, i would get it bored and do it right. Should i take it and get it honed at the shop? Any input is much appreciated."


Tom68
"That's not really honed, have you measured the bores ?
You need it machine honed, but only if your pistons can handle the extra clearance."

Tom68 is correct.
Sometimes " a picture is worth a thousand words " and it shows. If your not experienced with running a hone do get a proper deglaze and cross hatch pattern the end result will be a waste of time and money spent.
Take it to reputable machine shop and have everything checked out. Exceptable piston to bore clearance is about .0025" on these motors.