2 Responses to “Removing head, advice on other things to do?”

1. admin says:

   January 27, 2012 at 11:42 pm

   Factory says 60 for the belt if you go to the trobale I wlode do the
   belt  make shore you get the timing right good lock
   

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   On Sun, 3 Aug 2003 18:06:14 -0700, "mngineer" <nos…@cox.com> wrote:
   >Hi all,
   

   >Another question; I’m removing the head on my Miata 1.8L, probably going to
   >do a valve job, definitely going to clean out some carbon.  Any advice on
   >anything else I might want to do while I’ve got it this far apart (repairs,
   >maintenance or improvements)?  I’ve got some high RPM (4500+) pinging with
   >smoke and have some cooling problems on really hot days (often here in
   >Phoenix) when I run the a/c (although I’m putting in a new, bigger, radiator
   >and a new thermostat and may have that licked).  I used to have lots of
   >pinging at all speeds, but cleaning out the EGR passages took care of most
   >of that.  I don’t think the previous owner ever got it over 3000 rpm or
   >drove more than 3 miles at a time.

   >I was going to do a timing belt as it has 93K on it and I didn’t know if the
   >previous owner had done it or not.  Got the valve cover off and saw that the
   >belt says Gates on it.  I think I’m safe in asuming that the factory didn’t
   >use Gates belts.  There’s one thing I guess I don’t have to do.

   >TIA,
   >John (’94 Miata)
2. admin says:

   January 27, 2012 at 11:42 pm

   Your point about the timing is well taken; the belt looks good but it looks
   to me like the intake cam is retarded by one tooth.  That’s about 8 degrees.
   I’ve messed with the cam timing on small block V8s and know that you can see
   significant differences from a 4 degree change (of course that’s intake and
   exhaust together).  I’d be interested to see how much difference it makes
   when I correct this, but unfortunately I’ll be changing other variables
   simultaneously.
   

   Thanks,
   John (’94 Miata)

   <ilike2eat cookes .com> wrote in message

   news:9706jvc1tra5r4siic6ds7rnfthb8np0a4@4ax.com…

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   > Factory says 60 for the belt if you go to the trobale I wlode do the
   > belt  make shore you get the timing right good lock
   > On Sun, 3 Aug 2003 18:06:14 -0700, "mngineer" <nos…@cox.com> wrote:
   

   > >Hi all,

   > >Another question; I’m removing the head on my Miata 1.8L, probably going
   to
   > >do a valve job, definitely going to clean out some carbon.  Any advice on
   > >anything else I might want to do while I’ve got it this far apart
   (repairs,
   > >maintenance or improvements)?  I’ve got some high RPM (4500+) pinging
   with
   > >smoke and have some cooling problems on really hot days (often here in
   > >Phoenix) when I run the a/c (although I’m putting in a new, bigger,
   radiator
   > >and a new thermostat and may have that licked).  I used to have lots of
   > >pinging at all speeds, but cleaning out the EGR passages took care of
   most
   > >of that.  I don’t think the previous owner ever got it over 3000 rpm or
   > >drove more than 3 miles at a time.

   > >I was going to do a timing belt as it has 93K on it and I didn’t know if
   the
   > >previous owner had done it or not.  Got the valve cover off and saw that
   the
   > >belt says Gates on it.  I think I’m safe in asuming that the factory
   didn’t
   > >use Gates belts.  There’s one thing I guess I don’t have to do.

   > >TIA,
   > >John (’94 Miata)