Mike Garfias wrote:
> Robert N. Eaton spoke forth with the blessed manuscript:
>
>>Mike Garfias wrote:
>>
>>
>>>Two small valves weigh more than one single one.
>>
>>Not really. Think cube-square law.
>
> Yes, really. you're failing to take into account the weight of the stem.
>
> Two valves = two stems
>
> A single LS1 intake valve (2.020") weighs 105gm that is a solid stem, hollow
> stems are 93gm. The 2.1" hollow stem valve is 97gm.
>
> One single valve for a Ford 4.6L 4cam motor weigh 53gm for the small diameter
> one, and 68gm for the large one. Note that hollow stem valves are not
> available for the Ford motor.
>
> Last time I looked 97gm is definitely lower than 136gm. (Large sizes shown here)
>
> These weights were pulled from Manley's catalog, and represent stainless
> valves, not something exotic. But theyshould be representative.
>
>
>>Titanium is denser than Aluminum.
>>
>>Yes, but _much_ stronger. The article stated that Ferrari "found it
>>necessary to..." Who am I to argue? ;-)
>
>
> Well, frankly, I'm inclined to NOT trust ferrari engineering when their cars
> need complete motor replacements after 30k miles. The thing is, the pistons
> are not that big to begin with, and don't need the brute strength of a conrod.
The new LS7 for the Z06 'vette has titanium connecting rods and intake valves.
(500 bhp 7.0 liter push-rod aluminum small block anyone?)
- --
KevinO
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