Bom dia a todos,
I’ve just finished stripping the head in my 2.0, it’s what might be considered series 2 as its chassis 665.
The very last valve I removed was different to all the others, it didn’t have a dished head.
It got me thinking, so I looked closely at them all.
I found 4 different valves, the flat top being one of them. The others differed in that 2 had no identification on the stem head, the others had two different numbers or symbols.
All not in itself critical.
But how do I know if any are the original sodium filled valves? Only the flat top one is slightly magnetic, the others are clearly SS.
M
Original 2.0 valves
Moderator: alh
-
Gaelicguy
- Posts: 232
- Joined: Thu Feb 04, 2021 5:50 pm
- Dino: Fiat Dino 2.0 Spider
- Location: Central Portugal
Original 2.0 valves
Too many motos and cars, not enough life left! 
Re: Original 2.0 valves
I have never seen any kind of documentation saying the 1987cc Dino engines had sodium-filled
exhaust valves from factory.
All the 2418 cc Dinos had these, causing their owners a lot of dropped valve disasters...
Different experts often claims the sodium-filled exhaust valves get brittle over the years,
especially in engines not driven regulary. Personally, I would avoid these valves.
Dinoswede
exhaust valves from factory.
All the 2418 cc Dinos had these, causing their owners a lot of dropped valve disasters...
Different experts often claims the sodium-filled exhaust valves get brittle over the years,
especially in engines not driven regulary. Personally, I would avoid these valves.
Dinoswede
-
Gaelicguy
- Posts: 232
- Joined: Thu Feb 04, 2021 5:50 pm
- Dino: Fiat Dino 2.0 Spider
- Location: Central Portugal
Re: Original 2.0 valves
Thanks Dinoswede,
That clears the sodium filled question. Although I must say my 1985 BMW636csi had sodium filled valves. When I sold it, it had 299k miles on it the head was off at 200k and the seats recut. I had a Getrag 5 speed in it and drive it very hard.
FYI, I’m just ordering valves & guides from Superformance. I checked the guide length to make sure I had the later 43 mm guides as the build is 000665. But the heads have what Superformance call the early type at 47 mm.
While we are on valves, is it the early exhaust valves or the sodium filled that were prone to the tips breaking off?
Michael
That clears the sodium filled question. Although I must say my 1985 BMW636csi had sodium filled valves. When I sold it, it had 299k miles on it the head was off at 200k and the seats recut. I had a Getrag 5 speed in it and drive it very hard.
FYI, I’m just ordering valves & guides from Superformance. I checked the guide length to make sure I had the later 43 mm guides as the build is 000665. But the heads have what Superformance call the early type at 47 mm.
While we are on valves, is it the early exhaust valves or the sodium filled that were prone to the tips breaking off?
Michael
Too many motos and cars, not enough life left!
Re: Original 2.0 valves
As far as I have understood, no 1987 cc Dino engine were equipped with sodium-filled
exhaust valves - at all.
These were introduced in the 2418 cc engines. Some years ago, a professional Ferrari
mechanic told me that the sodium-filled valves were developed in the late sixties for
racing purpose and high-performance engines, and probably therefore included in the
upgrade work re the 2418 cc Dino engines.
Unfortunately, the sodium "coolant" is said to be corrosive to the actual valve steel,
and after many years, the valve can suddenly break.
Dinoswede
exhaust valves - at all.
These were introduced in the 2418 cc engines. Some years ago, a professional Ferrari
mechanic told me that the sodium-filled valves were developed in the late sixties for
racing purpose and high-performance engines, and probably therefore included in the
upgrade work re the 2418 cc Dino engines.
Unfortunately, the sodium "coolant" is said to be corrosive to the actual valve steel,
and after many years, the valve can suddenly break.
Dinoswede