Sorry, I got distracted and forgot to put in labels. The pictures are all
"after" shots. The first one is the intake port, the second is the exhaust.
Note the difference in finish. And yes, it's a four-valve head. There are a
series of photos of the head being worked up halfway down this page:
http://www.flyinmiata.com/projects/rat_drivetrain.asp . I can't take any
more pictures at the moment as the engine is together.
Keith
At 11:21 1/14/03, you wrote:
>Mahalo for the pictures Keith. Are the intake and
>exhaust siamezed?? Actually think I just figured out
>that it is a four valve cylinder. On the before
>pictures see valve guides approximately in the middle
>of the picture and what I think are the valve seats
>above. Having problems visualizing the seats,
>possibly because they are at an angle.
>
>The after picture is totalling confusing. Could you
>post a couple of pictures taken at different angles so
>we could get a better idea of what you've done.
>
>The finish on the massaged head looks to be polished
>to my untrained eye. Is this a trick of the camera or
>is it really smooth as pictured.
>
>Us amauteurs, fortunate to live in the middle of
>nowhere, find this kind of information extremely
>helpful.
>
>Aloha
>Peter O.
>
>--- Keith Tanner <keith@miata.net> wrote:
> >
> > >I was told that polishing is not a good idea, as
> > the small imperfections
> > >in the bore helps to maintain swirls... and
> > therefor mixture..
> >
> > You want some light texture on the intake ports, but
> > exhaust ports should
> > be polished.
> >
> > Here are some shots from our race head. Not exactly
> > a Rover, but it's what
> > $1800 for headwork will get you...
> > http://www.gvii.net/dlralt/OTC/OTC_head4.jpg
> > http://www.gvii.net/dlralt/OTC/OTC_exhaust_port.jpg
> >
> > Keith
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------------
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http://keith.miata.net
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