[Healeys] Valve guides

[Josef.Eckert at t-systems.com]

When I restored my 100 first time I put in bronze valve guides, but had severe
problems with stuck valves in the running in phase.
So I took the head off and fitted iron guides and the problem was solved.
Josef Eckert
Germany

-----Urspr|ngliche Nachricht-----
Von: healeys-bounces at autox.team.net [mailto:healeys-bounces at autox.team.net] Im
Auftrag von Oudesluys
Gesendet: Mittwoch, 19. Oktober 2011 08:17
An: john spaur
Cc: healeys at autox.team.net
Betreff: Re: [Healeys] Valve guides

The best/safest material for valve guides in a cast iron head is cast iron. It
has the same expansion coefficient as the cast iron of the head so they can
not detach themselves from the head. As the valves are iron too (steel) the
tolerance between valves and guides can be slightly tighter. Bronze guides are
better suited to aluminium heads as the difference in expansion is less.
Bronze guides are used because of their better lubrication and thus presumably
lesser wear between valves and guides.
As the mileages we put up in these old cars are usually limited, wear is not
an issue. It does not make much sense to deviate from the original.
Kees Oudesluijs
NL