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Re: 174 cu in Engine Pistons
Posted by: Mlevair ()
Date: February 22, 2015 08:05AM

Bob,they are designed to fit the 69mm stroke style of vw pistons.

LeVair Performance & Restoration
Michael LeVeque
Anderson,IN
765-617-9307
Mlevair@sbcglobal.net
levairperformance.com

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Re: 174 cu in Engine Pistons
Posted by: dryenko ()
Date: February 22, 2015 08:13AM

Price for a set ?

Bob C aka Dryenko
Dobson, NC 27017

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Re: 174 cu in Engine Pistons
Posted by: dryenko ()
Date: February 22, 2015 08:26AM

Lets see:
I have a nice set of 3 9/16 Salih cylinders that are worn a bit to much for the 3 9/16 pistons I have for them.
Like .006 -.008" piston skirt to cylinder wall diametral clearance.
Too loose.
But, it seems they can be easily honed slightly to fit the VW 90.5 mm "A" series air cooled pistons and a set of Michael's rods and have a very nice set of aluminum finned cylinders to use in a performance application.
Anything wrong with this calculation?
Will the pistons clear the LM Corvair crank?
The VW piston and cylinder sets can be purchased for less than $200 delivered for a set of 4. With rings , pins and clips.
Hmmm...

Bob C aka Dryenko
Dobson, NC 27017

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Re: 174 cu in Engine Pistons
Posted by: dryenko ()
Date: February 22, 2015 08:32AM

This is a good chart for displacement :

[www.corvairkid.com]

Bob C aka Dryenko
Dobson, NC 27017

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Re: 174 cu in Engine Pistons
Posted by: dryenko ()
Date: February 22, 2015 08:44AM

Actually, just the 90.5 pistons are very reasonable :
[www.aapistons.com]

So Ted, maybe this is a way to go ??

Bob C aka Dryenko
Dobson, NC 27017

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Re: 174 cu in Engine Pistons
Posted by: RCSmith ()
Date: February 22, 2015 09:06AM

yes , a different rod helps alot, a great investment.

I just went through this whole routine with my Salih build, 3.19 stroke.


All worked out well with a 4.9 rod 22mm pin and off the shelf Keith Black pistons.



.

Ray C. Smith
'66 Corsa


Bergen County ,NJ

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Re: 174 cu in Engine Pistons
Posted by: Mlevair ()
Date: February 22, 2015 10:04AM

$300 a set. I think you will still need to machine down the pin boss on one side of the piston. It can be done with a small rotatory burr.

LeVair Performance & Restoration
Michael LeVeque
Anderson,IN
765-617-9307
Mlevair@sbcglobal.net
levairperformance.com

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Re: 174 cu in Engine Pistons
Posted by: teddbrown ()
Date: February 22, 2015 10:49AM

dryenko Wrote:
-------------------------------------------------------
> Actually, just the 90.5 pistons are very
> reasonable :
> [www.aapistons.com]
> -piston-kit?utm_medium=cpc&utm_source=googlepla&va
> riant=742293947&gclid=CL3D3cH_9cMCFcsjgQod7ioANg
>
> So Ted, maybe this is a way to go ??

I will use GM Pistons ($10 each) and rings ($25 set) on Rock auto (closeout) and I only have to bore the rod end and I'm finished. I was trying not to bore/press fit the small rod end for a larger wrist pin (About $120 labor). I thought it would be cool to have a drop-in piston that would increase performance and power without doing ANY machine work.... guess not.

I'm not having an issue of knowing what to do... using the GM 90mm piston was the original plan and the goal to keep the walls thick as the aircraft guys use for durability. Having pistons made was more for the Corvair community, than me....I have my pistons setting in a box awaiting rod boring.

Micheal builds higher performance stuff, so what he charges is fair.... I'm not in that market.

With only 4 people interested, I'm not going to pursue having pistons made any farther. I will just use the GM pistons and have the rod end bored as originally planned. I will post the 174 build using the GM setup later this summer.

Thanks everyone for your input.

Ted



Edited 1 time(s). Last edit at 02/22/2015 10:51AM by teddbrown.

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Re: 174 cu in Engine Pistons
Posted by: dryenko ()
Date: February 22, 2015 02:11PM

Ted , what is the spec / application for the GM 90 mm pistons?
And the pin diameter ?
Michael, please advise the C to C length of the $300 rod set , or are they stock length like around 4.760 or so"
I assume they have the full float 22 mm bushing for the VW pin, correct ?
Thanks

Bob C aka Dryenko
Dobson, NC 27017

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Re: 174 cu in Engine Pistons
Posted by: RCSmith ()
Date: February 22, 2015 02:38PM

check into 2.8 chevy pistons Bob.

1.598 thru 1.578 c/h
.906 pin
89 thru 90.5mm diameters available



added link
[www.summitracing.com]

Ray C. Smith
'66 Corsa


Bergen County ,NJ



Edited 3 time(s). Last edit at 02/22/2015 02:47PM by RCSmith.

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Re: 174 cu in Engine Pistons
Posted by: Paul S ()
Date: February 22, 2015 02:39PM

Sorry for being stupid, but what kind of hp increase can you expect with a 10 cubic inch increase on an otherwise mostly stock 140?


1964 Corvair Spyder
1966 Corvair Corsa
Fresno, CA.

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Re: 174 cu in Engine Pistons
Posted by: gnvair ()
Date: February 22, 2015 02:48PM

The only thing I can contribute to this is a reminder that a majority of the GM pistons require press fit pins and even a lot of non race pistons (both cast and forged) will be the same way and not have the grooves for the clips/spiro locks cut into the pin bore.
Air cooled VW's by design have floating pins and the pistons for that application will have the grooves.
I did not see anyone mention this in thread so I figured I would put that out there.

Lee J

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Re: 174 cu in Engine Pistons
Posted by: 68110monza ()
Date: February 22, 2015 02:50PM

Paul S Wrote:
-------------------------------------------------------
> Sorry for being stupid, but what kind of hp
> increase can you expect with a 10 cubic inch
> increase on an otherwise mostly stock 140?


The math says about 8 hp on an otherwise stock engine.

68 500/SS 164 95 hp Powerglide BLOWN MOTOR
1985 Z28 Camaro 350 sbc TH-350
2002 Grand Am GT 3400

Springport Michigan

Best Wishes all,
Donavin

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Re: 174 cu in Engine Pistons
Posted by: RCSmith ()
Date: February 22, 2015 02:53PM

Right Lee ,

That's why I went with the Keith Black race pistons.
They are made for locks.

Ray C. Smith
'66 Corsa


Bergen County ,NJ

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Re: 174 cu in Engine Pistons
Posted by: teddbrown ()
Date: December 26, 2015 04:43PM

Just to update everyone on the 174 project.

I used the GM V6 1.0mm over pistons. The rods were bored to .90 to accept the larger pins used in the V6 Pistons. I also had to slightly clearance the piston on 1 side to allow opposite rod clearance. I was not trilled about how thin the bored to .90, but I had to keep reminding myself its a Corvair and not a 350 Chevy race engine. Clarks bored the full-finned cylinders to specs and was an easy install.

I have gotten about 1000 miles on the Loadside so far and very happy with the increase in torque. I dont know of a cheaper way to gain this much cubic inches without boring the block, heads, etc

I had decided to go forward with the 174 custom pistons and awaiting KB to send back the latest quote.

http://www.corvairefi.com/futureexperimental/2-9l-large-bore-engine/]Large Bore Engine[/url]

Ted Brown
www.Corvair-EFI.com



Edited 3 time(s). Last edit at 12/26/2015 04:53PM by teddbrown.

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Re: 174 cu in Engine Pistons
Posted by: ihscomputers ()
Date: December 26, 2015 06:38PM

Corrected Link for 174 Project thumbs up

Dean F. Gemberling
Columbus, Georgia


1963 Rampside w/305 V8 - Built by Ken Arnold in 1998

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Re: 174 cu in Engine Pistons
Posted by: chris ()
Date: December 26, 2015 10:32PM

Good to hear Ted. Keep us posted!

'65 Monza 4 door
4 speed
110hp
Gardner, KS

Heart of America Corvair Owners Association

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Re: 174 cu in Engine Pistons
Posted by: teddbrown ()
Date: April 18, 2016 05:21AM

At 8,000 miles and the engine is still in one piece. This is an automatic but a pleasure to drive due to the little extra torque down low. Other than having the piston pins bored, it was a simple install and about the same/maybe cheaper than a conventional install.

Will it change your life... probably not, but if your boring .060 over for more displacement, boring .107 might be your answer. GM V6 pistons are in good supply and even some forged ones are out there if you look, but I think that might be over-kill for today's pistons. Upgrading to 140 heads this summer and see if they can kill the rods.

I will NOT be investing in the drop-in piston due to lack of interest, but I think its proven tech and using V6 Pistons are viable. Rods were they only thing that scared me about using these pistons but it appears my fear is unproven.

Link: Corvair 2.9 project
Thanks

Ted
www.corvair-efi.com

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Re: 174 cu in Engine Pistons
Posted by: teddbrown ()
Date: June 04, 2017 05:48PM

Update on the 2.9L engine.

Still running, at the 25000 mile mark and no thrown rods. Making the Corvair connecting rods accept the .906 pin of the GM V6 pistons was the only concern, but so far not issues found. Clarks Full fin cylinders were the best part of this install.... perfectly bored and pistons seated quickly.

Link to my website. www.corvair-efi.com which goes in more detail as I don't want to bore anyone with my crazy projects.

This project is pretty much dead since we could not get enough support to do a piston buy (7000k) and the wiffy is not letting me throw money at projects anymore since I have retired from my real job.

Ted Brown
Anderson, SC
68 Convert 110/PG/EFI/DIS
61 Loadside 102/PG/EFI/Dist
61 Rampside 4 speed (Restoration starts Nov 2015)
130HP/PG/Honda Engine Project
67 Monza Cpe
61 Greenbrier
**UPDATED** Corvair Fuel Injection and DIS Page

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Re: 174 cu in Engine Pistons
Posted by: MattNall ()
Date: June 04, 2017 06:21PM

Bottom line.... you are having fun!

Get back to work on the Honda repower...

There's 3 Japanese conversions on the road....none are a PG..





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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