- Sat Jan 25, 2020 10:40 am
#87398
Meteor Minor pistons have a very high dome as standard in order to achieve the correct compression ratio (17mm from apex to main body, as opposed to 12mm on a Constellation piston).
As far as I'm aware, there never were any 'sports' pistons for the MM, (in fact fitting the MM pistons to a Connie is a good way of bumping up the CR by 1 atmosphere). Early versions of the MM used head gaskets of a thinner material in order to achieve a CR of 8.5:1, though this was changed to reduce it to 8:1 by using Super Meteor spec gaskets.
The MM Sports used a Constellation inlet camshaft on the exhaust, and this is supposedly the way RE achieved the extra 3hp of the sporty model. However, despite having 2 original Connies and several sets of camshafts, there's not a single Constellation-spec cam among them, as every one I've checked out is to Super Meteor spec - even those supposedly marked with the 'correct' Connie stampings..... so good luck finding one with the correct profile!
The MM I owned was indeed a gentle performer, but none the worse for that. I would urge you to keep it standard and enjoy it as it is; if you tune it, I'm pretty sure you wouldn't enjoy it anywhere near as much.