What am I missing here? B I was under the assumption that the 1976 Spits all
had flat top pistons - yeilding higher compression. B Were the California Spits
different? The info provided on the heads by others responding seems correct
according to my notes. B Is it possible this is a 1975 or 1977 Spit titled as a
1976? B Do the wheels have the "squared oval" holes or the round ones? B I
believe the squared oval holes only came on the 1976 Spits (and some other
Triumph... Marina?) B Maybe the engine was blown up and replaced by a previous
owner?
At any rate, I think you would probably have no trouble running flat top
pistons - whether or not you shave the head, but especially if you don't.
Joe Guinan
Fremont, NE
NASS Member #31
spitfirejoe@email.com
------------------------------Original Message------------------------------
> >>>> Message: 1
> >>>> Date: Sun, 25 Aug 2013 17:14:21 -0700
> >>>> From: Hans <sukaspit@gmail.com>
> >>>> To: spitfires@autox.team.net
> >>>> Subject: [Spits] High compression pistons and smog test
> >>>> Message-ID: <356B6E8E-7020-4D5B-A0DF-9188CA7C22E8@gmail.com>
> >>>> Content-Type: text/plain; charset=us-ascii
> >>>>
> >>>> I am rebuilding my California 1976 spitfire's engine and considering
> >>>> using
> >>>> Moss's HC flat top pistons instead of the LC (dished) ones. I have been
> >>>> told
> >>>> that I risk failing the NOx smog test max requirement. I understand that
> >>>> this
> >>>> is due to the combustion chamber's temperature potentially exceeding 2500
> >>>> degrees , which generates NOx. Assuming the EGR to function perfectly
> >>>> and the
> >>>> fuel mixture to a bit rich, is this still potentially a high risk
> >>>> problem?
> >>>> There must be a few a guys out there that have been tempted to do this
> >>>> to get
> >>>> the nearly 20 extra hp. That is so badly needed.
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