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Re: Some seller stories are true. S-10 2.8 pistons in a Corvair!
Posted by: Wagon Master ()
Date: May 19, 2017 05:57AM

On the majority of my builds, when pistons are replaced, regardless of manufacturer, a piston with a .010 taller compression height would be beneficial.

'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: Some seller stories are true. S-10 2.8 pistons in a Corvair!
Posted by: Phil Dally ()
Date: May 19, 2017 06:11AM

Baddest 2.8 I ever saw was in a Kellison at Bonneville.

Yep...in a Kellison like Brian's car with a blower.

The car was for sale with triple Webers.


[corvaircenter.com]

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Re: Some seller stories are true. S-10 2.8 pistons in a Corvair!
Posted by: JimBrandberg ()
Date: May 19, 2017 06:18AM

Well that's interesting. Arguably .0625 is sort of getting out there regarding cylinder wall thickness, maybe 60 full fin cylinders would be a good idea if building another one.
Does the piston protrude from the cylinder with stock .006 cylinder base gaskets? 8 CCs volume for the dish is a good piece of information for figuring C/R. Looks like you've still got some step in the head gasket surfaces.
When building engines for my road racing Corvair I could never seem to get enough compression, my recent activities find me constantly concerned with too much.
It seems like pistons with a bowl were not favorable for good flame travel back in the day but they are considered good practice in new engines today. Any discussion on what happens with a bowl on the bottom and a squish on the top?
Jim Brandberg
Isanti, MN
CorvairRepair.com

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Re: Some seller stories are true. S-10 2.8 pistons in a Corvair!
Posted by: cnicol ()
Date: May 19, 2017 06:44AM

I just measured the deck height and it's .008" (Top of the piston is .008" below the cylinder's head gasket surface.)

On a quick check of specs in the manual, I didn't find one for deck height but I'm remembering measurements of .010" on previous builds. Bottom line - deck height looks fine IMO.

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

+17 Tons of parts

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Re: Some seller stories are true. S-10 2.8 pistons in a Corvair!
Posted by: didget69 ()
Date: May 19, 2017 07:29AM

Looks like Pin Diameter is .9055"...

bnc

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Re: Some seller stories are true. S-10 2.8 pistons in a Corvair!
Posted by: JimBrandberg ()
Date: May 19, 2017 07:37AM

I'm not much of a Rockauto guy but I searched there for the Mahle part # above and discovered that is .030 oversize on closeout with only 2 left. The 2.0 engine came up on a 1983 search but not 1982.
They have a Sealed Power Std piston on closeout, putting 12 in the Cart didn't faze it. The Info shows .9055 pin size not .800.
They list Hastings rings on closeout and putting 3 sets in the Cart didn't faze it. Makes me nervous that they didn't allow you to choose the size.
I don't know that I'm excited enough to pull the $203 trigger for closeout stock, especially if the rods need to be reworked for bigger pins although the price is nice for 3 engines worth.
I usually need to calm down in these situations and remember that I've got a ton of stuff that was a good deal but how good is the deal if you're not using it?
Any follow-up on the pin size? Was .800 perhaps on the previous generation, was it 1.9 litre?
Interesting stuff.
Jim Brandberg
Isanti, MN
CorvairRepair.com

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Re: Some seller stories are true. S-10 2.8 pistons in a Corvair!
Posted by: JimBrandberg ()
Date: May 19, 2017 08:11AM

I went back to Rockauto and looked at 1.9 which looks like Isuzu which scared me.
Regan recalled using 2.0 pistons with .800 pins but I suppose opening up rods to .9055 isn't a deal breaker, although .800 would be easier.
I don't know that we determined for sure that Craig's pistons are 2.0 and not 2.8 as he was told. I will shut up and wait for more follow-up information.
Jim Brandberg
Isanti, MN
CorvairRepair.com

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Re: Some seller stories are true. S-10 2.8 pistons in a Corvair!
Posted by: Wagon Master ()
Date: May 19, 2017 08:14AM

Jim, my fuzzy math says putting 12 pistons in your cart is only enough for 2 engines. Unless you're going for manual cylinder deactivation.

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