Can anybody tell me if the intake and exhaust valve stems on a 1600 normal engine are solid or hollow?
Thank you
Ian
Valve stems
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Ian William Stockwell
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Valve stems
Porsche engine DNA is Flat Four, Flat Six & Flat Twelve NOT Flat Battery Packs 
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Al Zim
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Re: Valve stems
They are both solid. al zim
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356 Parts and Services
www.facebook.com/ZimsAuto/
www.instagram.com/zims_autotechnik/
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Ian William Stockwell
- 356 Fan
- Posts: 55
- Joined: Sat Feb 07, 2015 2:36 pm
- Tag: 356 not just a number
- Location: Andover, Hampshire, UK
Re: Valve stems
Thanks Al.
Porsche engine DNA is Flat Four, Flat Six & Flat Twelve NOT Flat Battery Packs
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Dick Weiss
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Re: Valve stems
Ian,
The valve stems were never hollow; Only under the head(s) and barely touching the stem(s) of the OEM SC/912 exhaust valves.
Dick
The valve stems were never hollow; Only under the head(s) and barely touching the stem(s) of the OEM SC/912 exhaust valves.
Dick
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Ian William Stockwell
- 356 Fan
- Posts: 55
- Joined: Sat Feb 07, 2015 2:36 pm
- Tag: 356 not just a number
- Location: Andover, Hampshire, UK
Re: Valve stems
Hello Al/Dick
Do you know what the material the valves are made from and possibly their hardness?
Ian
Do you know what the material the valves are made from and possibly their hardness?
Ian
Porsche engine DNA is Flat Four, Flat Six & Flat Twelve NOT Flat Battery Packs
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Dick Weiss
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Re: Valve stems
Ian,
Early normal and Super exhaust valves had added material to the 45 degree faces which lengthened their lives--until some burn-thru took place and compression was lost.
I never determined the later valve material (other than aftermarket stainless steel versions), but hey lasted longer if they were set to spec clearances during services.
Then came the later SC/912 (including the Carrera) valves having the sodium addition between the valve head and the stem; This lengthened the valve life to its seat face.
Dick
Early normal and Super exhaust valves had added material to the 45 degree faces which lengthened their lives--until some burn-thru took place and compression was lost.
I never determined the later valve material (other than aftermarket stainless steel versions), but hey lasted longer if they were set to spec clearances during services.
Then came the later SC/912 (including the Carrera) valves having the sodium addition between the valve head and the stem; This lengthened the valve life to its seat face.
Dick