<VV> Re: rocker arm ratios

Kirby Smith kirbyasmith at gwi.net
Mon Oct 17 16:27:26 EDT 2005

BobHelt at aol.com wrote:
> In a message dated 10/17/05 10:33:54 AM US Mountain Standard Time, 
> kirbyasmith at gwi.net writes:
>>the rocker arms are slotted where 
>>they mount to their studs.  Wouldn't this make the differential ratio 
>>variable over the valve cycle?
> Hi Kirby,
> Well, while I agree with the slight change in ratio at the tip, during a 
> rocker cycle (due to the rocker sliding over the valve tip), I can't agree that 
> there would be any change due to the slots. Wear patterns on worn engines show 
> that the rocker pivots right on the ball without sliding in the slot. Thus, if 
> I understand your question, I'd say no.
> Also as I referenced making a rocker measurement with two dial mikes, I don't 
> see that your question changes that suggestion. 
> Regards,
> Bob Helt
Thanks for the clarification Bob.  I was not disagreeing with your 
suggestion, I was thinking that the two mikes' measurements would have 
to be interpreted differentially if the slot were moving (in 
translation) relative to the stud.


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