American race cars (formerly - OT: new car advice)

[KevinO]

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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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