When did Porsche transition from silver cad plating to gold cad plating on 911's?

[DynoDave]

The title asks it all.

I am tring to determine when Porsche changed the color of their cad plating from clear (silver) to gold on SWB 911's. Thanks in advance for your input.

Dave

[John Straub]

Dave,

My '65 has silver and my '67 has gold.

John

[DynoDave]

John,

Thanks for your information, it is much appreciated.

How about 1966 - 911's - silver or gold? I am currently working on a 1966 - 911 that has both silver and gold cad plating present on different parts. I believe (think) that silver is correct, but usually when "I think I know," I find out that I really don't know.

Dave

[edmayo]

According to some research Paul Risinger did years ago the change was not a Porsche decision, but rather one forced on the industry by a change in DIN standards about that time. In normal Porsche frugality they just used up old hardware adding the new standard stuff as the old ran out. That will make it impossible to pinpoint a point in time that a change over occurred.

[John Straub]

Dave,

I think Ed nailed it on '66 cars...they may have both.

John

[DynoDave]

Ed & John,

I guess this poses a slight quandry w/ respect to sending out the hardware for cad plating. I will check the s/n to see where the car fell in Poreche's production run. If this 911 was produced early in 1966 MY, I would be inclined to stay with silver cad. Your guys thoughts? Thanks.

Dave

[1QuickS]

Steel hardware on Weber carbs started changing in mid to late 1967 for 1967 year models and by the 1968 year model the color on the Webers was gold.

[304065]

My considered opinion after discussion with guys who were there when the cars were new is that 66 was silver, 67 was yellow.

[DynoDave]

Thanks to all for this information.

Dave

[chris_seven]

There are several Cadmium finishes avaliable and are classified as follows:

Cadmium + Clear Chromate (Cl) - 12 hour salt spray to White Corrosion and 100 hours to Red Rust - Silver Appearance

Cadmium + Blue Chromate (CB) - 12 hour salt spray to White Corrosion and 100 hours to Red Rust - Silver Appearance

Cadmium + Olive Drab Chromate (CO) - 150 hour salt spray to White Corrosion and 200 hours to Red Rust - Olive Appearance

Cadmium + Yellow Chromate (C) - 96 hour salt spray to White Corrosion and 200 hours to Red Rust - Yellow Appearance

Cadmium without Finish Coat (CD) - 100 hours to Red Rust - Silver Appearance

If you Cadmium Plate any Fasteners with a Grade of 8.8 or greater it would be worthwhile having them 'baked' following plating to avoid any possible Hydrogen Embrittlement effects.

As Cadmium Plating is now reserved almost exclusively for Aerospace or Military Applications most platers that offer this process will be able to bake any fasteners.

Zinc plating is also available in Yellow and Clear Chromate finishes and I would still bake any Grade 8.8 or stronger fasteners.