how much boost is to much - Dodge Cummins Diesel Forum
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post #1 of 17 (permalink) Old 03-21-2013, 11:08 PM Thread Starter
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how much boost is to much

I have a 98 12v extended cab, and i was just wondering how much boost i can run before i have to o-ring the head. I already have head studs and a slightly thicker gasket

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post #2 of 17 (permalink) Old 03-21-2013, 11:09 PM Thread Starter
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How much boost is to much boost

I have a 98 12v extended cab, and i was just wondering how much boost i can run before i have to o-ring the head. I already have head studs and a slightly thicker gasket.
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post #3 of 17 (permalink) Old 03-21-2013, 11:53 PM
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I am also interested ive read on stock bolts/gasket you can run 35 Psi max so curious at what point studs and thicker is not enough and when you have to o ring

98 QCLB 12V 5spd. plate MIA, Issipro pyro and boost, afc full mod, K&N cold air, tork tek ofv,18.5* timing, rebuilt updated NV4500, SBDD 3600, 5x.016 injectors, 024 dv's, 4k gsk, 60# valve springs, arp studs, Bd Super B special, BD boost boots,
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post #4 of 17 (permalink) Old 03-21-2013, 11:59 PM
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how much boost is to much

I would say 45-50 psi max on studs and the head gasket ...



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post #5 of 17 (permalink) Old 03-22-2013, 03:11 AM
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You're at the edge (maybe over it) of blowing a head gasket at 40psi with factory bolts. That said, I ran one for years at 50 psi on over torqued factory bolts with no o rings and never had an issue. A guy who built some hot Cummins engines for race trucks told me what to torque them to and it would hold. He was right. I broke everything else but that old 300,000 mile engine ran like a song and never gave a minute's trouble. My current truck let go after about 18 months of 45 psi at factory torque specs. I wish I could remember what the torque spec he gave me was and I would tell you.

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post #6 of 17 (permalink) Old 03-22-2013, 07:40 AM
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I think your timing plays into this as well. The more you advance the timing the higher the cylinder pressures get.
other factors may include exhaust back pressure and intake air temperature.
If you are putting in hot air it wont expand as much as cool air would.
if the exhaust/turbo housing doesn't let all the spent air out easily, you wont have as much room in the cylinder for fresh cool air to come in.
people who block off the waste gate actuator on their stock hx35 will see higher boost psi numbers but those trucks dyno lower hp than trks who let the wastegate open and free up exhaust flow.

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post #7 of 17 (permalink) Old 03-22-2013, 09:31 AM Thread Starter
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My timing is set at 15 degrees and I have the bd super single, so I don't imagine drive pressure is really an issue right now
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post #8 of 17 (permalink) Old 03-22-2013, 11:43 AM
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Timing plays a major role. I agree with drooling piston. 12 valve heads are said told hold more boost than 24 valves also. Another big role on the head gasket is prolonged egt's. More expansion and contraction not to mention the heat against the fire ring in the stock gasket.

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post #9 of 17 (permalink) Old 03-22-2013, 01:36 PM
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how you like the bd super single spool quick with easy egt's been lookin at that one some myself

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post #10 of 17 (permalink) Old 03-22-2013, 01:38 PM
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It all depends on how you treat it. With my setup I see 65 lbs on just studs and no problems yet. I also rarely see that kinda boost and when I do, I am sure to have it good and warm. Never let it see boost when it is cold.

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post #11 of 17 (permalink) Old 03-22-2013, 02:52 PM
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Re: how much boost is to much

What 12valvedriver said. I never get on my truck when it isn't up to full operating temp. On stock timing my truck ran 45 psi for a couple months. Then saw 40psi with 16* timing. For months. When I installed dvs it saw 50psi with the wastegate closed and held. It only saw that twice. Then with the new turbo its seen 55psi once and normally holds about 45psi. But it rarely sees that. I drive my truck easy. And never get on it when it isn't up to full temp

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Dying is always a way bigger concern than egt's...
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post #12 of 17 (permalink) Old 03-22-2013, 08:36 PM Thread Starter
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the bd single is wicked i never see temps over 1200, I have the fuel to air ratio matched prity good also very little smoke at 40 psi
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