1st Generation Dodge Cummins 89-93 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps

is 40lbs boost to much for stock headgasket and studs?

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Old 04-06-2012, 08:10 PM
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Default is 40lbs boost to much for stock headgasket and studs?

I can achieve 40psi boost pretty easy and ive heard thats about as much as you want. is this true?
 
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Old 04-06-2012, 10:23 PM
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Thats about as far as I would push it and I wouldnt do it often.
 
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Old 04-07-2012, 11:39 PM
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wit the stock size turbo you are fine. wouldnt recommend a bunch higher. i would retorque the head bolts just as a precaution. if you were pushing 40lbs on a bigger turbo you would be having more issues. you dont really have the volume of air to
-really...- pop gaskets yet. can and has been done but still prolly fine and dandy.

i hit 52psi a few times with my stock charger
 
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Old 04-08-2012, 02:17 AM
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I run 40 on mine without problems. Though for some reason my intercooler boot clamps need to be tightened every couple weeks

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AlsoStock gaskets are good for 50 psi if in good shape.
 

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Old 04-13-2012, 05:28 PM
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At the bare minimum I'd re-torque to 125ft/lbs but I certainly wouldn't feel comfortable running boost that high with a stock gasket. There is really no way to tell when they'll go before they go. Some let go at 30psi, other have been living with 50+psi for months with no problems.
 
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Old 04-13-2012, 06:57 PM
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Lots of people run 50psi on stock hg n bolts. Peobryant I'm not trying to rag on your but the problem with re-torqueing head bolts is they can stretch or even break while others are fine, Basically it's like a woman, unpredictable on which way they are gonna make life miserable. (No offence intended ladies)

I ran 40psi n the PO of mine did for about 3 years before I got it. It all depends on the truck but most hold 50 or close to it. If your going to re-torque head bolts let it cool over night n pull each bolt one a time n oil the threads that helps get em tighter with less strain on the threads.
 
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Old 04-13-2012, 07:54 PM
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Originally Posted by 1stgenblowingsmoke
Lots of people run 50psi on stock hg n bolts. Peobryant I'm not trying to rag on your but the problem with re-torqueing head bolts is they can stretch or even break while others are fine, Basically it's like a woman, unpredictable on which way they are gonna make life miserable. (No offence intended ladies)

I ran 40psi n the PO of mine did for about 3 years before I got it. It all depends on the truck but most hold 50 or close to it. If your going to re-torque head bolts let it cool over night n pull each bolt one a time n oil the threads that helps get em tighter with less strain on the threads.
I agree 100%, but personally I'd take that chance over running 40psi with my stock gasket and bolts. I know the risks involved with each and I think the safer route is a re-torque, but again that's my own personal opinion.

And please, call me Parker. I prefer 1st Genners to call me by my first name, that's why I have it in my signature.
 
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Old 04-13-2012, 07:57 PM
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i have been running over 40 for a while... now its up to 44. studs and stock gasket.
 
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Old 04-13-2012, 09:04 PM
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With original 760,xxx mile head gasket and bolts and an HX52 I'm seeing 45 psi with no bad signs yet. It's not that I so much expect to never have trouble with this situation but I thought I'd throw in my experience.
 
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Old 04-13-2012, 09:42 PM
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Originally Posted by peobryant
I agree 100%, but personally I'd take that chance over running 40psi with my stock gasket and bolts. I know the risks involved with each and I think the safer route is a re-torque, but again that's my own personal opinion.

And please, call me Parker. I prefer 1st Genners to call me by my first name, that's why I have it in my signature.
Sorry can't see your sig for some reason. If I was to re-torque mine I thin i'd go the safe route of new bolts. But I may pull the head in a year or so n replace the gasket n run studs just to be on the safe side with the drive pressure.
 



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