[Healeys] Stainless competition valves

[Michael Salter]

Hi Andy,
Before making a decision on the material for your guides I would recommend
reading this:
http://www.netbug.net/blogmichael/?p=384
You may get away with it but, you may not.
Unfortunately the consequences of a valve seizing in a guide can be
catastrophic and I see no good reason for taking the risk when cast iron is
a perfectly satisfactory material for valve guides which will provide years
of service without the risk of seizure.

Michael S
BN1 #174

On Wed, Dec 10, 2014 at 11:12 AM, Niels Bengaard <bengaard at 850r.dk> wrote:

> 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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-- 
*If you can't fix it with a hammer, you've got an electrical problem.*