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Late Model Head Cam Cap Unpuched

 
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Old 28 Aug 2013, 06:57 pm
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Default Late Model Head Cam Cap Unpuched

Cleaned a head up and found cam caps are no longer marked.
Someone at Chrysler found a way to save 5 cents a vehicle.
(New vs Old)

Mark them before removal!
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File Type: jpg Unmarked Cam Cap Resize.jpg (36.2 KB, 43 views)
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Old 28 Aug 2013, 10:02 pm
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Default Re: Late Model Head Cam Cap Unpuched

i always match mark cam caps before i remove them.


i HATE when i get a head and a bad of cam caps that are unmarked.......


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Old 28 Aug 2013, 11:52 pm
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Default Re: Late Model Head Cam Cap Unpuched

1.6 SOHC & 2.4 DOHC Chrysler head It is not that bad if the caps get mixed up. In most cases new caps or machining is rarely necessary So if you do get a head that someone has mixed them up there is a couple things you can do.
One is to look at the machining marks on the bottom and match the pattern to where it was on the head. This takes some time and patients to do. Another thing is to completely clean both head and cam cap surface and install a cam with plastic gauge and measure all the clearances. Unless you find a cap that is excessively to tight or to big a clearance then you can mark you new found cam cap positions and you should be good to go?

The biggest things to be concern about is damage,dirt and tight clearances.
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Last edited by NitroPT; 28 Aug 2013 at 11:55 pm.
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Old 01 Sep 2013, 12:37 am
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Default Re: Late Model Head Cam Cap Unpuched

Improving from the KAOS and mix up of cam caps.




Yes these originally looked like the first picture!


Now I just need to stud them and remark them and they will be better stronger and look high performance. Should be worth a few hp gain just for the shine?

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Old 01 Sep 2013, 05:42 pm
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Default Re: Late Model Head Cam Cap Unpuched

Not

Gonna


ask
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Old 01 Sep 2013, 06:09 pm
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Default Re: Late Model Head Cam Cap Unpuched

Quote:
Originally Posted by UptownSport View Post
Not

Gonna


ask
The caps had been marked and re-marked at least twice and were not in the correct position on the head anyway? They looked "fuggly" so I fix both the incorrect marking, position problem and looks. Clean them,mic'd them and did some light machining giving them a billet look. Which actually strengthens them up anywho! Not because that area needs it but I was bored that day and they bugged me as they were!



Besides you should well know me by now....I gotta to change everything "my way"!
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Old 01 Sep 2013, 06:43 pm
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Default Re: Late Model Head Cam Cap Unpuched

Quote:
Originally Posted by NitroPT View Post
The caps had been marked and re-marked at least twice and were not in the correct position on the head anyway? They looked "fuggly" so I fix both the incorrect marking, position problem and looks. Clean them,mic'd them and did some light machining giving them a billet look. Which actually strengthens them up anywho! Not because that area needs it but I was bored that day and they bugged me as they were!



Besides you should well know me by now....I gotta to change everything "my way"!
But how dose removing material make it stronger?
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Old 01 Sep 2013, 07:13 pm
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Default Re: Late Model Head Cam Cap Unpuched

Quote:
Originally Posted by Busted_PT View Post
But how dose removing material make it stronger?

A small crack will start at an imperfection on the surface, then slowly (or quickly, depending on the load) propagate through the cast part until breakage occurs . Some fatigue failures will begin at imperfections within the cast part, but surface imperfections are more common.
One way to reduce the failure rate of any cast part is to polish it.This polishing will improve the fatigue strength of the cam cap.
Polishing makes the surface smoother and eliminates many surface imperfections.
To further increase the fatigue strength, after polishing, you can shot peen or bead blast as I did with these on the outside of the cam cap. If you look closely at the pictures you can see where this was done. This creates a layer of metal on the surface of the cast cam cap which, when unloaded, is in compression. This will reduce the peak load on the surface of the cast cam cap and thus reduce the likely hood of failure.


Got it Danny Boy?




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Old 01 Sep 2013, 07:17 pm
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Default Re: Late Model Head Cam Cap Unpuched

Quote:
Originally Posted by NitroPT View Post
A small crack will start at an imperfection on the surface, then slowly (or quickly, depending on the load) propagate through the cast part until breakage occurs . Some fatigue failures will begin at imperfections within the cast part, but surface imperfections are more common.
One way to reduce the failure rate of any cast part is to polish it.This polishing will improve the fatigue strength of the cam cap.
Polishing makes the surface smoother and eliminates many surface imperfections.
To further increase the fatigue strength, after polishing, you can shot peen or bead blast as I did with these on the outside of the cam cap. If you look closely at the pictures you can see where this was done. This creates a layer of metal on the surface of the cast cam cap which, when unloaded, is in compression. This will reduce the peak load on the surface of the cast cam cap and thus reduce the likely hood of failure.


Got it Danny Boy?




Got it.
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Old 01 Sep 2013, 09:55 pm
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Default Re: Late Model Head Cam Cap Unpuched

I've never heard of a single cap failure on the big Neon boards, amazing given the stupid cam / spring combinatins and the stupid (self inclusive) owners.

There's a small area that's been milled, it made the thinnest area thicker.
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