Corvair DiagramCorvair Photo
Corvair Center
home forum corvairs calendar links Corvair Podcast
California Corvairs
Clarks Corvair
Clarks Corvair
“CORSA"



Chevy Corvair License Plate
Chevy Corvair Chrome Wheel
Corvair Center Forum :  Corvair Center Phorum The fastest message board... ever.
Corvair Center 
Pages: 12Next
Current Page: 1 of 2
O/T Engine lubrication
Posted by: ken ()
Date: January 12, 2019 07:44AM

I saw this when the author was talking about the 10 worst cars .

Another of its more famous blunders is the 1971 Chevy Vega. Apparently, the engine of this car was so defunct that it couldn’t even hold oil. This meant that after around 100 miles, the car would lose all ability to lubricate its tumblers and pistons. As any car buff knows, this is bad news.

BE SURE TO LUBRICATE YOUR " Tumblers "

Options: ReplyQuote
Re: O/T Engine lubrication
Posted by: joelsplace ()
Date: January 12, 2019 08:09AM

Quick! Ask him how to do that. I'll probably lose sleep now worrying about my tumblers.

Options: ReplyQuote
Re: O/T Engine lubrication
Posted by: Kyle_in_Mich ()
Date: January 12, 2019 08:26AM

Wow. That would be grounds for me not reading reading much from that author again.

CORSA Member
Traverse City,MI
Daily driver- Bicycle
Fun driver/project- 65 Corsa 140/4 speed

Options: ReplyQuote
Re: O/T Engine lubrication
Posted by: American Mel ()
Date: January 12, 2019 08:31AM

Lubricating your Tumblers is highly over-rated!
Even though, "the engine of this car was so defunct that it couldn’t even hold oil.", my sister drove her Vega for several years.
So apparently we don't need oil in our cars at all.
It is just another money grab from the Petroleum Industry. eye rolling smiley

.
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
WA. state, 1 mile south of the Canadian border,
I am not at the end of the world, but you can see it from here.
'66 Monza Coupe - 4spd, 140 Daily driver beater
'67 Monza Vert. - PG, 140 Daily driver beater
'67 A/C Moredoor Monza - 140 4-spd. driver

Options: ReplyQuote
Re: O/T Engine lubrication
Posted by: MonzaDave ()
Date: January 12, 2019 08:47AM

The Vega engine issue was the Nikasil coating used on the aluminum block to obviate the need for steel cylinder liners. It didn't work as well as they'd hoped and some (a lot of?) engines became serious oil burners. Nikasil had been considered for use on the Corvair, but was rejected -- thankfully.

Dave Keillor
Rochester, MN

Options: ReplyQuote
Re: O/T Engine lubrication
Posted by: 66Monza140 ()
Date: January 12, 2019 09:11AM

Nikasil is widely used in two stroke engines.
With a 40:1 gas/oil mixture ratio, it works quite well.
Maybe if GM had eliminated the oil control rings, those motors would've lasted......eye rolling smiley

"Give'r hell 'til you see God, then back'er down a notch"

'66 Monza 140 4 sp w/A/C...
Western VT

Options: ReplyQuote
Re: O/T Engine lubrication
Posted by: joelsplace ()
Date: January 18, 2019 05:01AM

Vegas were not Nikasil they used a high silicon content aluminum and ran no liner or coating. Supposedly it failed because the bean counters didn't use the aluminum the engineers specified. Nikasil is much more durable than cast iron.

Options: ReplyQuote
Re: O/T Engine lubrication
Posted by: jjohnsonjo ()
Date: January 18, 2019 05:35AM

True, even Porsche ran Nikasil, I think someone made them for the Vair a while back. My brother had a Vega from new and did regular 2k-3K oil changes. The body rusted out before the engine gave out.

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa

Image and video hosting by TinyPic

Options: ReplyQuote
Re: O/T Engine lubrication
Posted by: joelsplace ()
Date: January 18, 2019 05:50AM

There is a guy on eBay selling Nikasil Corvair cylinders.

Options: ReplyQuote
Re: O/T Engine lubrication
Posted by: Brizo ()
Date: January 18, 2019 08:14AM

The Vega's were Ok as long as it was never over overheated, but get one hot enough and the silicon layer would melt and severely score the cylinders. By the late "80's (if the body was still good enough, and the owner cared ) we were having the blocks sleeved, as were rebuilders, (like Jasper)

Dan Brizendine,
'64 8door Greenbrier 140 PG. "In beautiful Wanamaker Indiana...with one stop light and 5 pizza shops"

Options: ReplyQuote
Re: O/T Engine lubrication
Posted by: 2ragtops ()
Date: January 18, 2019 08:42AM

I have a set of NOS Corvair "tumblers" I have been setting on for years.

They are going up on Ebay right now...…….with a buy it now.

Bob Bauer

Show-Me Corvairs

1966 Monza Convert 140 P/G with A/C, plastic wheel with tele-column am-fm posi-traction
1966 Corsa Convert 180 wood wheel tele-column am-fm sport steering posi-traction
1965 Corsa Coupe Crown V8 temporarily red lined for repair
House Springs, Missouri

Options: ReplyQuote
Re: O/T Engine lubrication
Posted by: joelsplace ()
Date: January 18, 2019 10:29AM

Vega blocks didn't have a coating.

Options: ReplyQuote
Re: O/T Engine lubrication
Posted by: Frank DuVal ()
Date: January 18, 2019 10:38AM

Right, Joel, they were silicon aluminum like Mercedes, Porsche, etc.

It was the overheating issue that moved the block more than the cast iron head (only aluminum head Vega was the Cosworth) and distorted the cylinders.

If only a larger radiator was installed and the car not sold as an American car, it would have worked wonderfully, like the same alloy in Mercedes and Porsche has shown!smileys with beer

Sell it in the price range of a disposable car, and it will be!grinning smiley

Frank DuVal

Fredericksburg, VA

Options: ReplyQuote
Re: O/T Engine lubrication
Posted by: Brizo ()
Date: January 18, 2019 02:04PM

joelsplace Wrote:
-------------------------------------------------------
> Vega blocks didn't have a coating.

Your right, it was not a "coating". They used a chemical process on the cylinder walls that ate away the aluminum in between the molecules of silicon, leaving about .002 thick silicon surface. And if it overheated or got coolant in the cylinders, it didn't take long to wear through it.

Dan Brizendine,
'64 8door Greenbrier 140 PG. "In beautiful Wanamaker Indiana...with one stop light and 5 pizza shops"

Options: ReplyQuote
Re: O/T Engine lubrication
Posted by: joelsplace ()
Date: January 18, 2019 02:08PM

I spent a few seconds looking for an article I read once on the process but didn't have any luck.

Options: ReplyQuote
Re: O/T Engine lubrication
Posted by: stitch ()
Date: January 18, 2019 02:18PM

My Vega overheated once. After that it would blow water/coolant out the exhaust. Was a sweet running/handling car in it's infancy...drinking smiley

"If you can't fix it with a Hammer, you have an Electrical problem."
Stitch...
Schertz, Texas.
(Smallish town/burg 17 mi. NE of San Antonio)

!967.. 4th body
8th off the line

Options: ReplyQuote
Re: O/T Engine lubrication
Posted by: cnicol ()
Date: January 18, 2019 02:31PM

Vega engines were cast using "Alumasil" as specified by the engineers.


Alumasil is not a coating and it did not come off when hot.
The cylinders didn't distort
The radiator was not too small

here's how Vega engines went down:

Air in coolant led to small coolant loss at head gasket.

Eventually, low coolant would cause overheat.

Hot engine would cause cylinders to drop slightly into block, causing head gasket leak - coolant to cylinder.

Coolant entering cylinder would cause loss of tin-plating on pistons.

Exposed aluminum on piston would then be in contact with aluminum/silicon cylinder wall.

Without the tin plating the two would cause deep galling of piston and cylinder wall and subsequent loss of oil control.

That, and the tumblers wouldn't get oiled...grinning smiley

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

Options: ReplyQuote
Re: O/T Engine lubrication
Posted by: john.jackson ()
Date: January 18, 2019 03:04PM

cnicol Wrote:
-------------------------------------------------------
> Vega engines were cast using "Alumasil" as
> specified by the engineers.
>
>
> Alumasil is not a coating and it did not come off
> when hot.
> The cylinders didn't distort
> The radiator was not too small
>
> here's how Vega engines went down:
>
> Air in coolant led to small coolant loss at head
> gasket.
>
> Eventually, low coolant would cause overheat.
>
> Hot engine would cause cylinders to drop slightly
> into block, causing head gasket leak - coolant to
> cylinder.
>
> Coolant entering cylinder would cause loss of
> tin-plating on pistons.
>
> Exposed aluminum on piston would then be in
> contact with aluminum/silicon cylinder wall.
>
> Without the tin plating the two would cause deep
> galling of piston and cylinder wall and subsequent
> loss of oil control.
>
> That, and the tumblers wouldn't get oiled...grinning smiley


Thanks Craig. We Corvair owners should be well aware of how "Urban Legends" about supposed "defects" get passed around and compounded. At some point, they have a life of their own and are bigger or more widespread that the simple truth.

Like how "unsafe" the Corvair was/is.

Is their any car engine that does not respond well to over heating and coolant loss?

Options: ReplyQuote
Re: O/T Engine lubrication
Posted by: joelsplace ()
Date: January 18, 2019 04:38PM

Some engines are very durable when abused and others aren't. 250 Chevy 6 cylinders are nearly indestructible. I was in a friend's truck and noticed the oil pressure gauge was reading 0. I asked him about it and he said is broke when he changed the oil a few days earlier. We were running full throttle down the highway and not too long after that it locked up. We checked the oil and of course nothing on the dip stick. We hitched a ride and came back with 5 quarts and it took every bit of it and guess what? The oil pressure gauge worked. He claimed that he had run it out of oil and locked it up two other times. It had cooled off and freed up by the time we got back and it started right up. I would never be that lucky. I guess he kept his tumblers lubed.
I've read the NorthStar engines randomly turn off cylinders when they get too hot to keep them from melting and that supposedly you can limp home with total coolant loss. Not sure I buy that.

Options: ReplyQuote
Re: O/T Engine lubrication Craig!! Back me up!!
Posted by: MattNall ()
Date: January 18, 2019 04:38PM

Vegas.... ALSO....

First 4,000 Engines in 1971 had a different piston! The Skirt would break on them and instant smoker...

Also those that didn't overheat... 40k miles or so..... Valve stem seals! Just like EARLY Honda Accords...

Bought a early '71 in '74 because it had factory AC! S-inlaw needed AC...22k miles..

Was going to put a sbc in it... but when checking engine... no low cylinders... one super high / oil carbon....how I found out about the early pistons...

At 40k it started smoking again.... but symptoms showed Stem seals...

We put the 307 PG in my buddies wagon that he bought with an OVER HEATED engine... 2 cylinders had fallen almost 1/8" [ casting sag.. ]





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

Options: ReplyQuote
Pages: 12Next
Current Page: 1 of 2


Sorry, only registered users may post in this forum.
This forum powered by Phorum.