<VV> Valve Rotators

[Geoffrey A Johnson]

An exhaust valve rotator is much like its name suggests.  It spins the 
exhaust valve by a tiny bit each time it is lifted, to keep debris and hot 
spots from developing, and to 
maintain a smooth valve face wear pattern.  I.E. reduce burned valves. 
I imagine they were more needed when there was crud in the gas, namely 
lead <GGG>.  They were 
commonly used used on stressed and stationary engines.  This is why 
Chevrolet used them 
on FC engines.  There were different methods used through the years by 
various manufactureres for various engines.   One 
that simply let 
the valve "float" rotationally when lifted, positive ones that actually 
rotated the valve a little bit when lifted (what the corvair used), and 
offset rockers, like VW used which made 
the rocker "wipe" across at a slight angle to the valve to make it rotate 
a touch.  I have run them over the years more for novelty then anything. 
They fit in place of the usual spring keeper. 
They do add weight to the valve train, and theoretically can increase 
valve face and seat wear, but I doubt by much.  Therefore they are not 
common in high output, high revving applications.
If you look at the tip of any properly functioning valve, you should see 
slight pollished annular rings from the valve spinning on its own slightly 
in operation.
-Geoff Johnson


On Thu, 1 Jun 2006, BBRT wrote:

> Aaaah, Grasshopper....I'll let someone else tell you!  :>)))))
>
> BBRT
> ----- Original Message ----- From: <mhicks130 at cox.net>
> To: <virtualvairs at corvair.org>
> Sent: Thursday, June 01, 2006 10:19 PM
> Subject: <VV> Greenbrier Questions/95 HP engine vs big bore
>
>
>> What in the name of all that is holy is an "exhaust valve rotator"??????
>> 
>> mike
>> 
>>> ------------------------------ 
>> <snip>
>> The 95 HP
>> FC engine (with exhaust valve rotators) is a sweet, hard working
>> engine--especially with a 4spd.
>> 
>> Bob Hall
>> Group Corvair
>> '64 Brier
>> '65 Corsa
>> 2 '68 Monzas
>> >------------------------------ 
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