Mercedes W201 190E 16V EVO

Forgot.
The exhaust valves i´m going to run in the turbo motor are from an american manufacturer named Ferrea.
Let´s just say...that in general i don´t hold americans and quality in the same sentence,but...when it comes to valves Ferrea and DelWest are good quality valves by any standard.
Just got a call that the valves are here,so i´ll be picking them up shortly and take a couple of pictures of those as well.
One thing´s for certain...i have no idea how mercedes can charge what they do for the crappy-by racing standards-exhaust valves.

Ferrea and DelWest both can also deliver good quality titanium valves for those so inclined.

From left to right...
1/A stainless steel aftermarket valve.7mm spindle and recut to 33mm at the head.
2/The mentioned Peugeot valve.
Again cut to 33mm head on a 7mm spindle.
3/Stock 102.983 exhaust valve.
33mm head on a 8mm spindle.Sodium filled spindle to cope with the heat.

Point here is that the progress in metalurgy has given that we don´t "need" the sodium anymore-which in turn only makes the valves more expensive.

Further if you take a look at this poor quality picture;



...you can see that the stock valve is a 2 piece design that´s friction welded together.Again...something that we don´t want in a high reving performance motor.
Furthermore the stock valve is made out of a VERY soft material.
Reasons for that....is beyond me at this point.

The stainless aftermarket valve is tough as a diamond.

Danke für Infos und Bilder!


Bye
Maki

Thanx Maki.



Stainless steel aftermarket valve.



Peugeot valve.

I would be hard pressed to say that the thinner spindled valves would improve horsepower per se as the cosworth head flows like nothing you would imagine already as it is,but...
The thinner valves WILL be lighter which WILL leave you more "room" when at high revs,which WILL reduce stress on components.

Like i state the 1mm thinner shaft will not reduce strength in any noticable manner due to evolution in metalurgy.
For the sake of reference NO high performance motors are made with 8mm spindles these days,and the fact is that most work with 6mm.
So..
These valves are indeed lighter,will reduce stress,a LOT cheaper and so forth..