Yep only some of the pistons had marks on them. As far as I know the
engine hasn't been rebuilt but I really don't know its history so who
knows.
The machinist didn't say anything but it looks all chrome so I guess
thats a good thing. The guy at the shop said before the machining that
one of the valves looked like it had some oil damage? or something like
that.
-----Original Message-----
From: Tom Richardson [mailto:[EMAIL PROTECTED]]
Sent: 28 February 2001 15:25
To: [EMAIL PROTECTED]
Subject: Re: A87 Head & Machining
Anthony,
Only some pistons had marks in them? Some pistons have valve recessions
in
the tops of them, and I've seen people replacing only 1 or 2 'bad'
pistons
during a rebuild. Maybe the engine has been re-ringed at some stage and
one
or more damaged or worn pistons were replaced with new ones that have
valve
recessions on them?
I would suggest that valves hitting pistons would cause lots of damage,
so
perhaps this isn't what happened
Did the machinist have to replace any of the valves due to damage, or
did
they notice any of them were damaged before they reground them?
- Tom
----- Original Message -----
From: "Anthony" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, February 28, 2001 1:51 PM
Subject: Re: A87 Head & Machining
> I just spent $120 getting my head machined and the valves recut which
I'm
told it needed and was a good thing to do to it.
>
> The thing that has me slightly worried is that after decoking the
pistons
I found a few small marks in them in the shape or an arc (the size a 1/4
of
a 5 cent piece would make), only on or two and on the raised lip around
the
edge of the piston but I also noticed that the head had been machined
before
as the "NISSAN JAPAN A87" marking was less than a millimetre from
the
bottom edge.
>
> Would these marks on the pistons be from the valves hitting the
pistons?
and after have the head machined will they hit even more? And finally is
this a problem? Something tells me it is ....
>
> A worried
> Anthony
>
>
> [EMAIL PROTECTED] wrote:
> >
> > Anthony,
> >
> > Tom has covered most of your question - the A87 head was used
standard
on
> > most of the Japanese and Aussie L18 engines, open chamber heads were
used in
> > other markets (USA etc) probably to satisfy anti polly laws (only
guessing)
> > but open chambers sure weren't used for performance reasons.
> >
> > regards
> > Terry
> >
> > -----Original Message-----
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED]]On Behalf Of Anthony
> > Sent: Tuesday, 27 February 2001 11:56
> > To: [EMAIL PROTECTED]
> > Subject: A87 Head
> >
> >
> > Sorry to ask this again but I'd really like to know ...
> >
> > What makes the A87 head so good? or is it the standard L18 head?
> > What type of performance increase is gained by having one over the
standard?
> >
> > Anthony
> > __________________________________________________________________
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> >
> >
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