<VV> 110 HP/95 HP differences for 1968-1969

[Lon Wall]

BobHelt at aol.com wrote:

> In a message dated 11/26/2007 10:28:55 AM US Mountain Standard Time, 
> corvairs at pacifier.com writes:
>
>     ????????  Maybe I misunderstood. Any engine that uses the domed
>     pistons HAS to use the hemispherical chamber head (same as 64-66
>     turbo) otherwise there will be interference with the domes
>     pistons. In that case the heads are NOT the same. If you used
>     these hemispherical heads with flat pistons you'd have a n 8-1
>     comp ratio rather than the usual 9-1. That's a big difference in
>     headfs. Teh domed pistons were never used in 95hp heads. Lon
>
> Hi Lon,
> Well, I guess so.......
> Obviously any Corvair engine using domed pistons would have to use one 
> of the open-chamber heads that Chevrolet made.  But, please 
> note!  These are Not hemispherical heads by any stretch. They are just 
> without any squish area. 

And yes, they are not hemi heads technically, but they "do" have a 
hemispherical- type dish. Just a convenience in words.

>  
> But nevertheless, yes, these would have a CR of about 9:1 with the 
> domed pistons. That is what Chevrolet deemed appropriate for the 
> smog-type 110 HP engines.


Uh,......ok.

>  
> And yes again, with the open-chamber heads and flat-topped pistons, 
> you got a CR of about 8:1.  Isn't that just what the smog 95 engine 
> used for a CR.?  Doesn't that work out just perfect?  Both engines 
> using the SAME open chamber head? So you can clearly see now that only 
> ONE head-type..the open-chamber head .....was used for any an all of 
> the 95hp and 110 hp smog engines.

But that isn't true. Both the open chamber (hemis...etc) head and the 
95hp head have the  same compression ratio (or at least almost the same) 
but that's it. The chamber design of the 95hp head had a flat step and a 
lower raised area while the turbo/smog pump head has an open chamber. 
Technically different with, what we could assume, different operating  
features. Lon

>  
> Regards,
> Bob Helt
>
>
>
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