[alfa] Re: 1993 Spider Valve Noise Solved!!!

["Dean W. Cains" <dwc@xxxxxx>]

Hi Craig:

Thanks for taking a chance, and for sharing with us all.  I'm anxious to 
have quiet valves on my '87 Spider, but would have never thought to tighten 
the valves up by that much.  Did you ever measure them a second time, while 
hot, after the new adjustment specs?

On my XKE, which has a very similar head design to the Alfa's, I once 
checked clearances hot versus cold, and the hot were tighter.  Anyone have 
any ideas as to why the Alfa clearances loosen?

Regards,

Dean


At 11:09 PM 5/30/2004, you wrote:

> Date: Sat, 29 May 2004 22:54:23 -0600
> From: "C.M. Bereznoff" <bereznov@domain.elided>
> Subject: [alfa] 1993 Spider Valve Noise Solved!!!
>
> After a lot of research on the issue, I had my mechanic set
> the clearance at factory specs.  Then he ran the engine to
> operating temp and quickly pulled the covers and checked the
> clearances again.  WOW, the clearances opened up 4-6 thds!
> Where the Intake was set at 0.017, it opened to 0.021-0.022,
> the exhaust was 0.019 and opened to 0.023-0.024!   We agreed
> to set the cold engine clearances to 0.012 intake and 0.014
> exhaust.   What a difference!  No valve noise and best of
> all the performance is now fantastic in the 3.5-6.5 Krpm
> range  ( should be, the lift is increased and the duration
> increased ).   The rpms just fly upwards from 3.7krpm to
> redline.  The engine seems like a small V6!!  Maybe I get
> this result from the performance ECU I installed but I never
> felt it before the clearance changes.  There may be a liitle
> less low end performance in the less than 2.5 Krpm range but
> not very much less.  I am going to run these settings and
> see how time treats me and the alfi !
>
> Craig Bereznoff, 93 Spider, Longmont, CO
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