Dart heads - off topic (sort of)

[The Punisher]

That was kinda My point.
for example:
If you have 10 identical heads and take them to 10 randomly selected machine 
shops,half with serdi and half with stones. You are going to get more good 
valve jobs from the serdi shops.
many of the machine shops I have visited do not care very much about 
quality. realy good machine shops are hard to find. And of course a true 
artist can do amazing things with stones. but thats way more work than 
you'll get with a 'regular' valve job.


>From: Carl Summers <InTech at writeme.com>
>Reply-To: diy_efi at diy-efi.org
>To: diy_efi at diy-efi.org
>Subject: RE: RE: Dart heads - off topic (sort of)
>Date: Mon, 07 May 2001 03:14:02 -0700
>
>Ok, so here I have to disagree.  I will state upfront that someone good 
>with
>stones can do an excellent valve job, BUT, it takes 4-5 times longer than
>with a Serdi.  A Serdi also has a depth micrometer so you can equalize the
>heights of the seats.  Forget three angle valve jobs....the flow is in the
>proper radius cut(depending on the head).  The longevity of the valve job
>has nothing to do with what machine does it... The width of the 45(or
>whatever) has more to do with longevity.  On your asymetric seat thingy... 
>I
>would agree if you are VERY talented with stones there are ways to
>compensate for flow angles... and its' Berco not Berko
>-Carl
>p.s. I HAVE done both... 7 years with a Serdi.... I'd take it any day over
>almost anything.  If you want your gnats ass of flow increases with 
>spending
>20-30 hrs with stones you better have a WET flow bench...and I would still
>use sanding rolls instead...after the Serdi.
>
>
>-----Original Message-----
>From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
>Behalf Of Larry Heath
>Sent: Friday, May 04, 2001 5:07 AM
>To: diy_efi at diy-efi.org
>Subject: Re: RE: Dart heads - off topic (sort of)
>
>
> > BTW. if you are having a valve job done, be sure to have the seats "CUT"
> > instead of ground. A shop that uses a "Serdi" machine is what you want.
>The
> > seats have a machined finish instead of a ground finish. youre valve job
> > will last longer, and may flow a little better(in theory).
> >
>
>This is patent nonsense.
>
>Serdi cut seats and seats cut using stones are no different, EXCEPT you can
>do the seats in a head a hell of a lot faster using a Serdi machine, i.e 
>its
>more cost effective for the shop. On top of that they charge more because
>they have the newest hot lick machine and it takes less time to do. They
>make more money. It also depends on who is doing the work, either way. I
>have seen butcher jobs using a Serdi machine as well as using stones or
>Neway cutters or any of a half dozen different methods of putting a seat in
>a head, it still depends on who is doing the work and how well trained they
>are and how much care they take in doing the job.
>
>You cut a seat using a Serdi machine and a seat using stones and if there
>the same angles and widths you are going to get the same flow and the same
>life. I use a Serdi ( its actually a Berko) and I use stones, mostly 
>general
>rebuild stuff on the Berko and race stuff using stones. There are things 
>you
>can't do using a Serdi machine such as asymmetric seats.
>
>
>Don't buy into the advertising and propaganda that you have to have a Serdi
>machine to do superior work, cause that is plain crap!
>
>Later Larry
>
>
>
>
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