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Cast Iron Ring Seating
Posted by: MonzaJPD61 ()
Date: January 23, 2018 07:16PM

My 61 Monza w/98 hp engine was meticulously rebuilt by PO (lot's of records and documentation on what was checked and done). The rebuilt engine had about 250 miles on it when I bought the car and I've put about 1,500 miles on it myself. At idle, blow-by is noticeable from the road draft tube. Would you expect that these rings should be seated by now (cast iron), or is there still hope?

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Re: Cast Iron Ring Seating
Posted by: davemotohead ()
Date: January 23, 2018 07:20PM

Cast rings seat fast, a small amount of vapor/ smoke is normal for a road draft tube, How much is coming out of the tube?





Email me at: Dave Motohead

1960 4dr sedan caveman car
1961 Rampside (Chetside)
1962 Rampside (Barnside)
1962 Short Rampside (Shortside)
1962 Monza 700 Wagon
1963 Monza 900 coup (General Nader)

-----------------------------------
Rust Free Lancaster Ca

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Re: Cast Iron Ring Seating
Posted by: MonzaJPD61 ()
Date: January 23, 2018 07:33PM

Hard to describe the amount, but it's enough to see from in front of car standing up, looking back. It makes you think it's coming from tailpipe, but when you walk around back and look closer, you can see it's coming from underneath at draft tube. It does look more like white/gray vapor as opposed to blue smoke.



Edited 1 time(s). Last edit at 01/23/2018 07:38PM by MonzaJPD61.

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Re: Cast Iron Ring Seating
Posted by: caroseiii ()
Date: January 23, 2018 07:43PM

How is your compression? Did documentation show PO install NEW pistons and cylinders or re-ring?

Crawford

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Re: Cast Iron Ring Seating
Posted by: MonzaJPD61 ()
Date: January 23, 2018 07:49PM

I will check all 6 and post compression results this weekend. Paperwork indicates new .020 pistons, matching rings. Original cylinders bored and re-used.

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Re: Cast Iron Ring Seating
Posted by: vairmech ()
Date: January 24, 2018 05:21AM

Here again a lot depends on what grit hone was used for the cylinders. If a coarse hone was used the cast rings are probably already worn out with to much end gap. Been there done that!

One thing to try is use full throttle on acceleration, rings do need pressure to seat. Without that the cylinders glaze and you never stop using oil with lots of blow-by. The full throttle thing needs to be done every time from start at a stop and will take a little time to show any progress if at all.

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

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Re: Cast Iron Ring Seating
Posted by: Layton Curtis ()
Date: January 24, 2018 05:27AM

Once upon a time in the 1960s, I had some rings that wouldn't seat. They finally seated during a 200 mi stretch of interstate at 75 mi hour.

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Re: Cast Iron Ring Seating
Posted by: Chilly Willy ()
Date: January 24, 2018 06:45AM

Could be the gaps weren’t clocked correctly. I’d convert it to PCV and drive it.




The Corvair, Keeping Nader Notorious winking smiley


Will
Northern California



Edited 1 time(s). Last edit at 01/24/2018 06:47AM by Chilly Willy.

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Re: Cast Iron Ring Seating
Posted by: Wagon Master ()
Date: January 24, 2018 01:31PM

Do a compression check. What has your oil consumption been during your 1500 miles of ownership?

'64 Monza Coupe 140 4 speed
'61 700 Lakewood 95 4 speed
'69 Monza Convert. 140 Auto.

Been aircooled since 1973
Northwest Ohio

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Re: Cast Iron Ring Seating
Posted by: MonzaJPD61 ()
Date: January 24, 2018 05:37PM

Used half a quart in 1,500 miles
Compression results this weekend

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Re: Cast Iron Ring Seating
Posted by: MonzaJPD61 ()
Date: January 27, 2018 09:01AM

Compression readings:
1-145#
2-138#
3-140#
4-145#
5-155#
6=150#

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Re: Cast Iron Ring Seating
Posted by: thumper477 ()
Date: January 27, 2018 09:27AM

Chilly Willy Wrote:
-------------------------------------------------------
> Could be the gaps weren’t clocked correctly.
> I’d convert it to PCV and drive it.


+1

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Re: Cast Iron Ring Seating
Posted by: curt ()
Date: January 28, 2018 11:22AM

A new 1967 Rambler, 232 cuin engine burned oil big time. At 2,000 miles we drove it 200 miles at 60 mph. Car never burned oil after that. Rambler used cast iron rings.

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Re: Cast Iron Ring Seating
Posted by: 66cv8 ()
Date: January 29, 2018 05:02AM

Clocking becomes moot after the engine is run. They are free to move in the ring groves and they do.

Joe

66 500 Crown 350/4 on road
66 Corsa Convertible 140/4 rough
69 Monza Convertible 140/4 in progress (original 95/3)
Nu Joisey

" A LITTLE KNOWLEDGE IS A DANGEROUS THING"

"STUPID is the NEW SMART"

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