<VV> Question regarding Summit stamped SBC Roller Rockers in Corvairs

Thu, 06 Jan 2005 16:32:31 -0600

The consensus (I believe) among Corvaviators (just made that up) is that 
roller rockers don't contribute much to an aircraft engine in the RPM range 
we're dealing with, and add a lot of unknowns (grinding out the slot sides, 
custom pushrods, different geometry, unproven flight history, etc.).  You 
can get stock ones from Clarks for $134 that have thousands of flight hours 
on them of proof that they work.  You can go to 
http://www.davemorris.com/SearchFlyCorvair.cfm and type in "rocker" or 
"roller" or any other keywords to see what William Wynne might have written 
on the subject.

I think Mark Langford has written a lot about his roller rockers here 
http://home.hiwaay.net/~langford/corvair/ but again they have not exactly 
been flight proven.

Dave Morris

At 05:12 PM 1/6/2005 -0500, LonzoVair@aol.com wrote:

>Hey guys,
>One of my former local pals has dropped me a note and I've told him I don't
>know about it, but someone from the VV list might have a suggestion... He's
>assembling a Corvair powered Aeroplane (I just love that old spelling) and 
>he's
>just wanting to do it right. If at all possible reply directly to him, since
>he's not on the list (but there are a few Vairplane nuts on the list, too, so
>maybe it wouldn't be that bad to copy to the list also.)...
>You can reach him at:
>nhulin@hotmail.com
>He is in the Cincinnati area, and a swell guy to boot.
>Thanks for the help!
>Lonzo
>
>Lon Anderson in White Mills, KY
>CORSA, Corvanatics, Central Kentucky Corvair, Derby City Corvair
>Quart Low Quarterly editor
>1961 Greenbrier pg, daily driver
>1963 Greenbrier 4spd.
>1964 700 sedan 95/pg
>Return-Path: <nhulin@hotmail.com>
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>To: <LonzoVair@aol.com>
>Subject: Question regarding Summit stamped SBC Roller Rockers in
>   Corvairs
>Date: Thu, 6 Jan 2005 15:00:11 -0500
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>Lon,
>
>Hope you have fully recovered from the encounter with Murphy earlier this
>year.
>
>I've got a quick question about Corvair engines;
>
>I've been looking at Summit's stamped 1.5:1 SBC roller rockers (Summit Part
># SUM-141506, pic attached) and I'm wondering if anyone has tried to use
>these on a Corvair. It looks to me that, since they use the standard rocker
>ball, it would be possible to use the stock stud and steel rocker cover.
>They are around $100 for a set of 16. I know that I'd probably have to grind
>out the slot sides a little since the Corvair rockers don't sit straight up
>and down on the stud, but that should be easily doable. The only other
>consideration would be getting the correct position of the roller on the
>valve stem for which I might need custom push rods from American-Pi.
>
>I emailed Jeff Ballard at SC Performance and he hasn't used them but can't
>see why they wouldn't work.
>
>Anyway, I'm just looking for feedback on the whole idea and any input on if
>you know if it has been tried before. If it is a crazy idea I'm hoping
>you'll tell me in plain language so I don't go off and try and do it if it
>isn't worth doing.
>
>Thanks, ...neil
>Neil Hulin, Cincinnati, Ohio
>
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