Duramax Diesels Forum Truck of the Week
  #16  
Old 01-09-2018, 06:12 PM
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Let's go back to the lifting cup issue.....
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  #17  
Old 01-10-2018, 07:39 AM
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Quote:
Originally Posted by Ne-max View Post
Let's go back to the lifting cup issue.....
It is a LBZ... It is lifting injector bodys.
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  #18  
Old 01-10-2018, 07:42 AM
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Originally Posted by Fingers View Post
It is possible that you have a crack in the head. The ones that only open up when things get hot are rare. I have a flaw in mine that only opens up when it is bitter cold. Coolant level goes down ever so slightly when the truck sits in the cold. I don't lose a drop in the summer.

To answer the tuning question. Hell yea you can create STUPID chamber pressures with bad tuning. To answer that question, you need to get on the rollers at a place that can measure the chamber pressures.
I don't think it has bad tuning motor has no knock or ping under heavy load, not a lot of smoke pretty clean for the power.. danville is the only place I know that has cylinder pressure tools.
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  #19  
Old 01-10-2018, 04:00 PM
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.020 overbore looking back at pics and I see this... is it possible that the "fire ring"
is to close to the edge?

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  #20  
Old 01-16-2018, 08:00 AM
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I pulled the heads, it lifted for sure. Not really sure how but sending heads out to check them again install gm gaskets and try again... wonder if i should go with some 625 head studs this time around?
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  #21  
Old 01-16-2018, 11:51 AM
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There is a 14mm head stud conversion option available from SoCal. I have not seen or heard much feedback from anyone running that setup. I am curious to know how well the stock head castings hold up on that much fastener torque.
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  #22  
Old 01-16-2018, 02:30 PM
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Originally Posted by jpowel29 View Post
There is a 14mm head stud conversion option available from SoCal. I have not seen or heard much feedback from anyone running that setup. I am curious to know how well the stock head castings hold up on that much fastener torque.
I am not interested in machining the head bolt holes, I think the 625 studs are the ticket.

What is the ARP2000 limit? ARP told me around
60 lbs
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  #23  
Old 01-16-2018, 03:33 PM
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60 lb? As in 60 PSIg boost? Heck, many people run 60 PSIg on stock head bolts.

I am no fan of the ARP2000 for our trucks (another story for another day), but they aren't that bad. If the head was lifting, there was another reason for it. Having the heads checked is the right answer, and if they are OK, I'd check the block. And make sure a good gasket is used (I like the Victor Reinz over the new GM ones) and the torque sequence is done properly.
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Old 01-16-2018, 03:47 PM
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Originally Posted by DAVe3283 View Post
60 lb? As in 60 PSIg boost? Heck, many people run 60 PSIg on stock head bolts.

I am no fan of the ARP2000 for our trucks (another story for another day), but they aren't that bad. If the head was lifting, there was another reason for it. Having the heads checked is the right answer, and if they are OK, I'd check the block. And make sure a good gasket is used (I like the Victor Reinz over the new GM ones) and the torque sequence is done properly.
That's what ARP told me I run well over 60psi in my high tune, However I was a bonehead and had a little race with another truck and it was -12* out. And it boosted well over 100psi I think.

I built the engine less than 1k miles ago used all MAHLE grade c gaskets and kit. block is solid and straight decked both mating surfaces as well.

super cold weather and too mas boost is the cause about 100% at this point..


Should I upgrade to the 625's?

I am a Master ASE and master diesel tech and own my own shop but the performance diesel is a newer thing to me
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  #25  
Old 01-16-2018, 03:50 PM
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Your set up won't make over 100psi of boost.
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  #26  
Old 01-16-2018, 04:03 PM
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It was up there I know that, but still not sure why it lifted.... when I pulled the heads I saw a very slight soot line over to the coolant passage, just racking my brain of why, its all new deck head surface etc. other than studs.

My third tune makes 50psi and in the cold was smacking sixty fast and hard I know it was going over 60 but have no hard proof of what is was, so I am just assuming in the high tune it was pretty high.

I am doubting my studs at this point this will be the third time using them.
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  #27  
Old 01-16-2018, 04:05 PM
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Quote:
Originally Posted by Ne-max View Post
Your set up won't make over 100psi of boost.
what do you think max would be? just wondering.
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  #28  
Old 01-16-2018, 06:26 PM
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Boost is a restriction measurement. I doubt you would hit 75 psi really. I donít think you have enough fuel to push them that hard.


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  #29  
Old 01-16-2018, 08:25 PM
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I donít know much about anything but I do know that like fingers said bad tuning can create horrible problems especially at high rpm high boost conditions. You need to make sure your tunes are on point because if for some reason just one small portion of the tune isnít tweaked enough and youíre getting crazy cylinder pressures or a number of other things I could see lifting a head being an issue.
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  #30  
Old 01-17-2018, 06:57 AM
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Quote:
Originally Posted by SAC owner View Post
That's what ARP told me I run well over 60psi in my high tune, However I was a bonehead and had a little race with another truck and it was -12* out. And it boosted well over 100psi I think.

I built the engine less than 1k miles ago used all MAHLE grade c gaskets and kit. block is solid and straight decked both mating surfaces as well.

super cold weather and too mas boost is the cause about 100% at this point..


Should I upgrade to the 625's?

I am a Master ASE and master diesel tech and own my own shop but the performance diesel is a newer thing to me

Soo, super cold air equals more boost huh? I've never heard this before, is it just bc it's more dense? I will admit my rcsb has been up on power lately...

Don't judge me guys, I live at the beach. Anything in the 30's is cold to me...
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