Dart heads - off topic (sort of)

[RJ Knudstrup]

My 2 cents on this issue guys and gals is this.  With the serdi if you have
a place that you can go into and talk to the guy and he chose the serdi
because of its benefits then I say go with him.  We have two places here
that have valve seat cutters and the rest use stones.  One is the high
performance shop and has a poor performing cutter compared to the serdi.
The shop that has the serdi looked at the same machine the other shop has
and liked the serdi better because the cutters are setup for the head and
not each individual valve.  We talked for awhile like atleast an hour about
it and the benefits.  I had already wanted the serdi to do the heads before
going there but talking to him made me decide he was to do it.  He knows
what he was doing and I bet could do it with stones but he can not do a 7
angle valve job with stones and he can with the serdi and for the same price
as a 3 angle.  BTW he will do 3,5 or 7 angle valve jobs all for the same
price on the serdi.  One thing though he will not do them with worn Valve
guides and recommends replacing if not within specs versus knurling them and
the valve seats directly depend on the trueness of the valve guides.

Christian J. Knudstrup

----- Original Message -----
From: "The Punisher" <punisher454 at hotmail.com>
To: <diy_efi at diy-efi.org>
Sent: Monday, May 07, 2001 2:36 PM
Subject: RE: RE: Dart heads - off topic (sort of)


> 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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