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 [email protected] ------------------------------Original Message------------------------------ > >>>> Message: 1 > >>>> Date: Sun, 25 Aug 2013 17:14:21 -0700 > >>>> From: Hans <[email protected]> > >>>> To: [email protected] > >>>> Subject: [Spits] High compression pistons and smog test > >>>> Message-ID: <[email protected]> > >>>> 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. _______________________________________________ [email protected] Donate: http://www.team.net/donate.html Suggested annual donation $11.47 Archive: http://www.team.net/archive Forums: http://www.team.net/forums Unsubscribe/Manage: http://autox.team.net/mailman/options/spitfires/[email protected]
