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Type 4 sodium filled valves or not
Posted: Sat Oct 24, 2020 5:48 pm
by pnikas
Hello everybody , I am into replacing the valves in my 914 heads. Right now they are old sodium filled valves for the exhaust and normal ones for the intake. Should I use again sodium filled, of go to the AE valves way and have solid ones?
Re: Type 4 sodium filled valves or not
Posted: Sun Oct 25, 2020 1:20 am
by Bruce.m
Solid
Re: Type 4 sodium filled valves or not
Posted: Sun Oct 25, 2020 6:21 am
by bushoarder
Sodium was to cool the valves, so going solid could increase your temps through the valve port.
Vw went to this approach for a reason.
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Re: Type 4 sodium filled valves or not
Posted: Mon Oct 26, 2020 12:13 pm
by Clatter
Can you still get sodium valves??
I thought they quit selling them..
Re: Type 4 sodium filled valves or not
Posted: Mon Oct 26, 2020 12:39 pm
by Bruce.m
It was an OEM solution in the late ‘60s / early ‘70’s. Since then modern metal tech means it’s not the best option. Wasn’t even the best option in period.
Watch this at 2mins onwards.
https://youtu.be/qBAS3cs14zQ
Re: Type 4 sodium filled valves or not
Posted: Mon Oct 26, 2020 1:53 pm
by twodollardoug
I got sucked into the video and watched the completed Lamborghini.
Re: Type 4 sodium filled valves or not
Posted: Mon Oct 26, 2020 2:22 pm
by Bruce.m
He’s got his own channel
https://www.youtube.com/channel/UC2pQT9 ... SVLtbJBvyw
. Worth a sub.
Deals with a lot super exotic with light use. So plenty of practice encouraging misfiring engines onto all cylinders without even replacing the spark plugs. The videos of him syncing 12 Weber barrels by ear is pretty impressive.
If that isn’t impressive watch Allen Millyards channel
https://www.youtube.com/channel/UC2pQT ... SVLtbJBvyw
(engineered motorbikes with nuts engines, like a viper V10, home made twin based on huge aero cylinders or stock bike with extra cylinders added)
Sorry for the OT
Re: Type 4 sodium filled valves or not
Posted: Thu Dec 10, 2020 10:36 am
by Wally
Solid and get a 8mm stemmed valve instead of the 9mm sodium as I assume you will replace exhaust guides anyways. 8mm adds a little flow too.