Valve Search

[kkrup62 at hotmail.com (Karl Krupke)]

Hmm... less reciprocating mass = higher rpm limit = more HP, maybe. One of 
the limits on a really highly strung- out engine is "valve float", when the 
springs aren't strong enough or valves too heavy (too much inertia) to cycle 
fully open/closed 7-9,000 times per minute. So you lose compression and 
power.
    Stronger springs will help, but the cam wears out more quickly. Also, 
stronger springs usually means thicker spring coil, which can bind on a high 
lift/ high performance cam profile. $$ Ker-unch.

I think the relevant question to ask is; "bang for the buck?" If these 
valves cost $150 for the set, will they give you more usable power than $150 
spent somewhere else [free-frow intake, better exhaust. hotter cam(s), maybe 
even better gear ratios.].

But reducing mass is always a good thing, especially in reciprocal 
components.

I leave you with two quotes from the late, great Sir Colin Chapman, who was 
Lotus for all practical purposes (and how many people do you know who have 
been granted an English Knighthood for automotive design and engineering?). 
I'd love to have a Lotus; older Elan or Europa... Esprit Turbo if I ever 
have $20-30k sitting around.
    The quotes:

1] Simplicate, then add lightness
2] To add speed, add lightness

OK, redundant and not exactly on topic... but the man built some great cars. 
Keep in mind our Sciroccos (Mks 1 & 2 both) are fairly light in their class.

Karl

>From: "Rave Racer 77" <raveracer77@yahoo.ca>
>To: <roccit_53@scirocco.cs.uoguelph.ca>
>CC: scirocco-l@scirocco.org
>Subject: Re: Valve Search
>Date: Tue, 27 Mar 2007 22:00:13 -0700
>
>How much does lightening up the valvetrain help though?  Is it worth the 
>$150?
>
>      Rave Racer
>Current:
>'91 Jetta GLI 2.0L 16V
>'81 Scirocco Mk1 1.8L 8V Digifant 2
>'86 Fox
>2 GTI parts cars
>
>Gone:
>'89 Jetta 1.8L 16V GTX
>'87 Audi 4000 Quattro
>'72 Triumph GT6
>
>http://spaces.msn.com/raveracer77/photos/
>http://www.myspace.com/rave_racer
>___________________________________________
>----- Original Message ----- From: "C Boyko" 
><roccit_53@scirocco.cs.uoguelph.ca>
>To: " Rave Racer 77 " <raveracer77@yahoo.ca>
>Cc: <scirocco-l@scirocco.org>
>Sent: Tuesday, March 27, 2007 04:58
>Subject: Re: Valve Search
>
>
>>I think mine just came from Techtonics, they aren't likely anything 
>>unusual
>>though. Titanium retainers I got from Autotech, boy, are they lighter than
>>stock.
>>Cathy
>>
>>On 3:10 am 03/27/07 "Rave Racer 77" <raveracer77@yahoo.ca> wrote:
>>>
>>>     Has anyone ever heard of this Supertech place and their Black
>>>Nitrite valves?  Does anyone recommend a Valve for my PL head to 9A
>>>block conversion?
>>>
>>>http://www.nolimitmotorsport.com/supertech/apps.html
>>>
>>>
>>>       Rave Racer
>>>Current:
>>>'91 Jetta GLI 2.0L 16V
>>>'81 Scirocco Mk1 1.8L 8V Digifant 2
>>>'86 Fox
>>>2 GTI parts cars
>>>
>>>Gone:
>>>'89 Jetta 1.8L 16V GTX
>>>'87 Audi 4000 Quattro
>>>'72 Triumph GT6
>>>
>>>http://spaces.msn.com/raveracer77/photos/
>>>http://www.myspace.com/rave_racer
>>>___________________________________________
>>>_______________________________________________
>>>Scirocco-l mailing list
>>>Scirocco-l@scirocco.org
>>>http://neubayern.net/mailman/listinfo/scirocco-l
>>
>>
>
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