[Healeys] Stainless competition valves

[Niels Bengaard]

I had a high end top made many years ago in Sweden for a Volvo 240 Turbo, it
was fitted with stainless Manley severe duty valves with chromed stems.
The valve guides were alu-bronze silicate.

Manley has some good information. They write:

Manley recommends bronze guides for race only applications and cast iron
guides for street use.
Manley chrome stem or nitride valves are compatible with either guide
material. Each Manley silicon aluminum bronze valve guide is precision
machined from a solid bar
of material. This provides proper self-lubrication even at elevated
operating
temperatures. The I.D. is honed and the O.D. is ground to insure tight
control of
concentricity necessary for repeatability and minimum valve seat machining.


Niels


-----Oprindelig meddelelse-----
Fra: Healeys [mailto:healeys-bounces at autox.team.net] Pe vegne af Andy Thorp
Sendt: 10. december 2014 03:02
Til: healeys at autox.team.net
Emne: [Healeys] Stainless competition valves

Hi Guys,

I am looking to get some stainless valves from UK and have just been advised
by the seller that they are incompatible with cast iron guides. Can anyone
confirm that this is true, conversely is anyone using AH Spares
'competition'
valves in cast iron guides without issue.

The early type stainless valves were not compatible with iron guides since
the stems aren't hardened, however supposedly the competition valves have
"pulsed plasma nitrided" stems. I don't want to order them and find out the
hard way that they are no use.

Andy.
$12.75
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