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Some seller stories are true. S-10 2.8 pistons in a Corvair!
Posted by: cnicol ()
Date: May 13, 2017 09:10PM

Cody and went together on a parts buy: He got the car ('65 A/C Monza) and parts, I got the rebuilt 140 and front seats.

The rebuilt 140 looks the part of a well built engine built by a knowing builder and the son said his dad really knew Corvairs. You never know about the stories though and the son said his dad built this engine with S-10 pistons because he couldn't find Corvair pistons. To be honest, I didn't really buy that part of the story.

However...

I took the engine down a bit today. Aluminum valve spring retainers, new valves, new push rods, viton o-rings. Awesome.

Cylinders are freshly bored and the engine has never been run! Score!

Then we get to the pistons. They're marked "STD" and the bore measures 3.5"; exactly what you get with a 2.8 V6. They ARE 2.8 V6 pistons! Oddly they have a mild dish which probably just about compensates for them being .0625 oversize!

The piston story was/is TRUE!!!hot 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

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Re: Some seller stories are true. S-10 2.8 pistons in a Corvair!
Posted by: cnicol ()
Date: May 13, 2017 09:14PM

Heads show signs of having chomped something (not a seat but something) but new valves. It will be interesting to see what he did for guides and wrist pins.

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

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Re: Some seller stories are true. S-10 2.8 pistons in a Corvair!
Posted by: cnicol ()
Date: May 13, 2017 09:15PM

Another motohead nightmare?

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

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Re: Some seller stories are true. S-10 2.8 pistons in a Corvair!
Posted by: ROD ()
Date: May 13, 2017 09:21PM

Score !

Rod Tetrault
El Cajon , CA
65 Corsa Yenko Clone / 65 Corsa EO Creampuff Vert
66 Corsa "JIMISH" Mid engine Turbo LS1 currently 2nd fastest Corvair in the USA
Class 5 Corvair powered Baja
61 Vintage Rampy
Corvair powered Buggy x 3
Enough hidden parts to build a space ship

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Re: Some seller stories are true. S-10 2.8 pistons in a Corvair!
Posted by: RexJohnson ()
Date: May 13, 2017 09:39PM

Maybe he couldn't find gasket either?

RJ tools
Salem,Oregon

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Re: Some seller stories are true. S-10 2.8 pistons in a Corvair!
Posted by: Mountainman ()
Date: May 14, 2017 07:37AM

Amazing that the piston pin size is the same for the S-10 piston or has the Corvair rods or pistons themselves been modified?

John Cummings

El Paso, IL

1965 Corsa Convertible Regal Red 180hp
1965 Corsa Coupe Metallic Blue 140hp
1965 Corsa Coupe Crocus Yellow 140hp (currently non op)


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Re: Some seller stories are true. S-10 2.8 pistons in a Corvair!
Posted by: cnicol ()
Date: May 14, 2017 07:49AM

Mountainman Wrote:
-------------------------------------------------------
> Amazing that the piston pin size is the same for
> the S-10 piston or has the Corvair rods or pistons
> themselves been modified?

I understand the S-10 piston has a larger wrist pin. Either the pistons have been bushed or (more likely) the small end of the rod has been bored to accept the larger wrist pin. I understand that Ted Brown (EFI guy) has 30K on a set-up like this and his approach was to bore the rods.

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

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Re: Some seller stories are true. S-10 2.8 pistons in a Corvair!
Posted by: Johnniespeed ()
Date: May 14, 2017 08:02AM

I am not a fan of aluminum spring retainers, as I have seen them expand outward and slip over the keepers more than once.
Reducing reciprocating mass is usually good, but would rather use the lightweight steel ones.
Very interesting fun facts about the 2.8 pistons.
Every 2.8 S-10 I drove was super slow and powerless, I have always assumed it was due to the small ports. Anyone know any fun facts on how to perk up the 2.8 ? ( not that I would ever need to know )

John

1962 Rampside, 4.3 Vortec powered.
The thrill of speed overcomes the fear of death.

Sparta Michigan.


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Re: Some seller stories are true. S-10 2.8 pistons in a Corvair!
Posted by: cnicol ()
Date: May 14, 2017 08:06AM

10-4 on the aluminum retainers. I plan to put them back to stock, steel ones.

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

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Re: Some seller stories are true. S-10 2.8 pistons in a Corvair!
Posted by: bobvair ()
Date: May 14, 2017 10:34AM

Mmmmmm...... copper....only the best.

Craig, you have the best luck of anyone I know. Congrats to you and Cody.

Bob Slusher
Portland, Oregon

63 Rampside
63 Rampside
65 Corsa Turbo Convert-EO
95 VW Camper 5 speed
71 Brabham BT 35

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Re: Some seller stories are true. S-10 2.8 pistons in a Corvair!
Posted by: Caraholic4life ()
Date: May 14, 2017 10:39AM

One of my vehicles is a 1991 Chevrolet S-10 Tahoe, Ext. Cab Pick Up. 2.8, 5 spd.
I bought it in 1996 with about 62K miles on it.
For several years it was my daily driver and even though it has not been a daily driver for a few years now, it still runs very well with 214K miles on it.

I have found the 2.8 with a manual transmission to have enough "get up and go" to satisfy my needs. No it isn't as quick as many of the other vehicles I have owned over the years butit doesn't need to be.

The down side is that after 21 plus years of ownership, the body is beginning to deteriorate enough that it needs replacement sheet metal. I have been gathering good OE pieces for a while now as it is my intention to go through it and have it re-painted. This truck has been very good to me over the years and owes me nothing but, like my Corvair's over the years, I have some loyalty towards it.

1965 Monza Coupe
Westminster, Maryland

MID ENG enthusiast &
prior Kelmark owner.



Edited 1 time(s). Last edit at 05/14/2017 10:49AM by Caraholic4life.

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Re: Some seller stories are true. S-10 2.8 pistons in a Corvair!
Posted by: moomba32 ()
Date: May 14, 2017 11:59AM

I've owned three S-10s over the years, all automatics, four cylinder was under powered, 4.3 was a bit more than most people need, the 2.8 seemed about right for what you expect in a transportation piece, kind of like the three bears.

Don Marlowe
66 Monza 2Dr 140/pg
64 Spyder convertible now, 110/pg
Eutawville SC

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Re: Some seller stories are true. S-10 2.8 pistons in a Corvair!
Posted by: MtnVairMike ()
Date: May 18, 2017 01:07PM

Caraholic4life Wrote:
-------------------------------------------------------
> One of my vehicles is a 1991 Chevrolet S-10 Tahoe,
> Ext. Cab Pick Up. 2.8, 5 spd.
> I bought it in 1996 with about 62K miles on it.
> For several years it was my daily driver and even
> though it has not been a daily driver for a few
> years now, it still runs very well with 214K miles
> on it.
>
> I have found the 2.8 with a manual transmission to
> have enough "get up and go" to satisfy my needs.
> No it isn't as quick as many of the other vehicles
> I have owned over the years butit doesn't need to
> be.
>
> The down side is that after 21 plus years of
> ownership, the body is beginning to deteriorate
> enough that it needs replacement sheet metal. I
> have been gathering good OE pieces for a while now
> as it is my intention to go through it and have it
> re-painted. This truck has been very good to me
> over the years and owes me nothing but, like my
> Corvair's over the years, I have some loyalty
> towards it.


X2 on the 2.8 living long. My wife's 1985 S10 Blazer she bought new had 286K on it with a 5 speed, never had the valve covers or oil pan off. Still ran great body failing. She still misses that ride

Mike

1966 Monza Convertible, 140HP-4 speed, Ermine White

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Re: Some seller stories are true. S-10 2.8 pistons in a Corvair!
Posted by: vairmech ()
Date: May 18, 2017 06:04PM

I have looked at every S-10 piston year there is and I don't see any that look like that. Most are flat top and look just like larger Corvair pistons. They have a .9055 pin dia. so the Corvair rod could be bored to that size. Only the newer ones had any dish to them but they also had valve reliefs.
It would be interesting to know what numbers are on the inside of the pistons.

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

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Re: Some seller stories are true. S-10 2.8 pistons in a Corvair!
Posted by: didget69 ()
Date: May 18, 2017 07:42PM

The 2.8 / 60-degree V6 engine later also came in 3.1 & 3.4 liter variations. The Isuzu Rodeo & Trooper guys have been building up ~200hp 3.4 variants, increasing fueling by opening up the intake manifold ports under the Throttle body & using 4.3 TBI body.

bnc

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Re: Some seller stories are true. S-10 2.8 pistons in a Corvair!
Posted by: gnvair ()
Date: May 18, 2017 07:47PM

There were different varients of the GM 60 degree V6 which may explain the differences in pistons.
The rear drive versions use in the S10, Jeeps and 82-86 F bodies had iron cylinder heads and carburetors or TBI.
The later versions had aluminum cylinder heads and MPFI.

Lee J

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Re: Some seller stories are true. S-10 2.8 pistons in a Corvair!
Posted by: MattNall ()
Date: May 18, 2017 07:53PM

Well then Craig must remove one barrel and find the PN!! so simple!





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

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Re: Some seller stories are true. S-10 2.8 pistons in a Corvair!
Posted by: REM654DPG ()
Date: May 18, 2017 09:38PM

Hey Craig,

Those pistons are from an early 80s 2.0 liter (122 ci) four cylinder Chevrolet.

The pin size is the same as the late Corvair piston (.800) and I think the rings are the same width too but the standard bore is 3.5 inches. I think the compression height is slightly taller - +.010 to .015 - but I can't remember for sure.The dish is about 8cc in volume and they make a great low budget big bore piston if you don't mind it being cast. I've used them before in some FC engines and had to buy three sets of four to make two Corvair sets. Of course they cost like $12.00 a piece jobber price so It was a pretty good deal. Looks like they're still available too.

Take care,

Regan Metcalf
Portland, OR

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Re: Some seller stories are true. S-10 2.8 pistons in a Corvair!
Posted by: MattNall ()
Date: May 18, 2017 10:12PM

all the info

[en.wikipedia.org]





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

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Re: Some seller stories are true. S-10 2.8 pistons in a Corvair!
Posted by: MattNall ()
Date: May 18, 2017 10:16PM

still cheap...

RockAuto

MAHLE/CLEVITE 2242180

$11.76





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

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