Close up photos of PSD valvetrain

[Mr. Brewski]

Check it out on Ebay http://cgi.ebay.com/ebaymotors/ws/ebayISAPI.dll?ViewItem&item=1812428181&r=0&t=0 Looks to me like they're not only lacking in the connecting rod area either - are those stamped steel rocker arms? Anyway, an interesting set of pictures.

 

[HEMI®Dart]

I've never seen more flimsy rockers in my life.

 

[Chris N5CWM]

Cackler

See it? It's right near the right rear

clylinder head next to the adjustable

frapenwhipple pot.



Oo.

 

[Archive]

The Rocker Arms Look like...

... those cheesey stamped steel wrenches the Japs put in their motorcycle tool kits back in the sixties and seventies.

 

[PZicha]

OH My god. . did the ford engineers cut them out of an old stop sign , are they at least supported on some sort of roller or bearing

 

[FFutch]

It ain't easy bein' cheesy...

Yeah,the rockers sure aren't made of much. I had the valve covers off of our 97 at work(replacing glow plugs )and couldn't believe those whimpy looking things . Doug

 

[WOWZY]

My uncle showed me some at his shop that had gotten bent due to overrev, jumping down too low a gear downgrade. A couple of push rods were bent also.



What's so funny about the link is there was only one bid for $100 ROTFLMAO!!

 

[Mr. Brewski]

Theres a used 6. 2 chebby in there with a $1 bid... .

 

[Cummins4Life]

Anyone have a pic of a 24valve with the valve cover off. I'd just like to contrast and compare. Oo. #ad

 

[Mr. Brewski]

This is from Steves write up on the new 2003 motor, but I believe the valve train is the same - the ISB's dont have those fancy and expensive hardwired injectors like this picture shows.



#ad

 

[klenger]

The PSD only has two valves per cylinder? How can that work?

 

[Mark_Kendrick]

The PSD only has two valves per cylinder? How can that work?

The same way a 12V does?

 

[dmurdock]

Considering the redline of the powerstroke and the design of these particular rockers, they actually look pretty strong to me...



although i will agree they look "cheap"

 

[Mr. Brewski]

They redline about the same as a Cummins if I remember correctly - 3500 rpm. I'm not an engineer, and I'll admit they might be stronger than they look - but they still look cheap. My old 6. 2 chebby had cast steel rockers with brass or oilite bushings and that was not a good motor. I'm wondering what the guts of a Duradud look like.

 

[jwgary]

Just remember that the bending moment of inertia is a function of the width times the height^3. If you make it taller it gets a lot stronger. It's the same idea behind an I-beam, and why drive shafts are hollow. I agree that they do look flimsy, but they are actually quite tall and strong enough for the loading placed on them.

 

[RPetersen]

They don't look all that flimsy... of course I used to be a foreign car mechanic. Ever seen the head off of a Fiat 1600 pushrod engine??

 

[Archive]

FIAT = Fix It Again Tony. (Former owner of a '78 128 3P. )

 

[hammersley]

If I remember from my strength of materials classes... .





The Moment of Inertia (I) is a term used to describe the capacity of a cross-section to resist bending. It is always considered with respect to a reference axis such as X-X or Y-Y. It is a mathematical property of a section concerned with a surface area and how that area is distributed about the reference axis. The reference axis is usually a centroidal axis.



The moment of inertia is also known as the Second Moment of the Area and is expressed mathematically as:





Ixx = Sum (A)(y2)

In which:



Ixx = the moment of inertia around the x axis

A = the area of the plane of the object

y = the distance between the centroid of the object and the x axis

 

[Bad340fish]

The 24V motor doesn't look to much better under the cover. There is a huge cast iron rocker arm that goes to a spindly little triangle thing that allows the massive rocker arm to open 2 valves at once.

Clark