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How much boost can a stock 24 valve head gasket take.

thumper 549

weigh allthings b4 you go to studs..cause if you have to pull the head after that, it's a real bear. Studs are better but new bolts will take a lot of abuse if you do not ever reuse them.
I am going to watch and see what the ans. is to your question is too ,,but I bet it is at least 40 to 60 just for conversation here.

More Power

Just wondering if i go to mach2 edm's and go to a hybrid turbo if i will need to be wastegated or not.

marksmith

I see 47 peak and 43 or so and I have no problems so far. I know of at least one truck that blew his gasket in two places and all he ever saw was 40lbs. Its a maybe it will maybe it wont type of thing. I think you would be relatively safe at 40. But IMHO get the wastegated variety so you can set the new turbo to boost in its "sweet spot"

Hope this helps
Mark

VinDiesel

As mentioned above, generally you can get by with about 50psi. Be careful to always have engine at full operating teperature before flogging it. I've heard of a few failures in the 45~49 range. This is the upper limit of what is efficient with a single turbo anyway (and beyond a stock HX35). Maybe you're thinking of twins? ;D

The good thing about wastegated housings is better spooling. You get faster response, then when the wastegate opens, you effectively have a bigger housing. Of course you get a little restriction due to turbulence. For street stay wastegated, race maybe non-w.g..

If you want to crank it up, you'll need a boost controller and fooler since you have all those electronics. Use the "boost rule of thumb": 1psi/10hp.

OlBlue

I've got the 01 HO 6spd also. I run 39psi MAX, but did hit 40psi once on a dyno. Almost always I have the box off so the PDR40 won't go over 32psi. I've never made boost go over 10psi until temp gauge starts to move and never over 20 until completely warm.

I also have a blown head gasket at cylinders 2 and 5!!!! :'(

MarkSmith, was the guy who blew his gasket at 40psi an HO?
How much boost are other HO owners running without problems?

Scotty

Much over 45 on an HO and its gonna pose a problem.
Some have held to 45 and mine went bye bye when at 54.
I later learned it was pooched from very early on...I had cracks in the head gasket to water galleys and between pistons as well as the gaping oil pushing chunk that was missing out the front. :'(
Some folks have determined that cracks are there by noticing that the over flow bottle for the radiator is always empty but no visible leaks...its blow back under load on the road.

marksmith

[quote author=OlBlue link=board=7;threadid=22965;start=0#msg215431 date=1070070437]
I've got the 01 HO 6spd also. I run 39psi MAX, but did hit 40psi once on a dyno. Almost always I have the box off so the PDR40 won't go over 32psi. I've never made boost go over 10psi until temp gauge starts to move and never over 20 until completely warm.

I also have a blown head gasket at cylinders 2 and 5!!!! :'(

MarkSmith, was the guy who blew his gasket at 40psi an HO?
How much boost are other HO owners running without problems?
[/quote]

Hmmmmmmm..... Yeah he was a HO motor. It was YOU that I was referring to. I havent heard of another HO blowing @ 40 psi. You get your truck back yet? Just curious. Hadn't heard anything. Withdrawl's suck! You need to bite the bullet and just ring the head and be done w/it! ;D

Take care
Mark

OlBlue

[quote author=marksmith link=board=7;threadid=22965;start=0#msg215525 date=1070089097]Hmmmmmmm..... Yeah he was a HO motor. It was YOU that I was referring to. I havent heard of another HO blowing @ 40 psi. You get your truck back yet? Just curious. Hadn't heard anything. Withdrawl's suck! You need to bite the bullet and just ring the head and be done w/it! ;D
Take care
Mark
[/quote]

I haven't gotten her back yet. :'( Maybe Monday. O-Ring equipment is a ways from here, but I really tried. This summer, when the roads are clear, I can schedule it, and the bombing fund increases, I'll either do O-rings or Fire Rings. Then I can go further with air, then fuel, then.....

Withdrawls ARE REAL!!!! I have a GREAT friend who stopped by every two days at the beginning to give me a fix. Now he has to stop by every hour!!!!

Thanks Desperado!

Scotty,
45psi is the magic limit for HOs? Are there very many rigs you can think of that are doing OK below that? I'm trying to decide if I need to dial the boost back down to 35 or so until some "real" headwork is done this summer.
TIA

More Power

Im a little confused on this are ho trucks easier to blow head gaskets on than so or say a 12 valve. And what price are we talking to o ring a head.

joefarmer

I sent you a PM with pricing info I got from www.enterpriseengines.com when I called them about the same thing about a week ago.

brandon.

Scotty

The HO has a higher compression. Up here in CCcccOLD Canada if the truck is not warmed up good and you pull a load...it can blow with stock power! I saw several at the dealers that simply weren't warmed up.

Check your overflow bottle as an advance warning.
However, even with that, I still managed to force a large piece of the head gasket out the front on number 1.
I would be careful in the cold and watch it closer with psi over 38.

I really wish I knew when I got the cracks in the head gasket...I think they happened shortly after I put in the DD stage 3's and that was at about 1200 miles on the odo.

Anyone found the limits on a third gen yet??
Maybe I will shortly. :'(

The cost varies with where you go and what you get done.
We pulled the head here and I had a local speed shop I trusted do the o-rings...I replaced all the gaskets with stock replacements. Some folks will go with a thicker head gasket...I think its the marine application...to lower the compression a bit.
Others on here can add info about the things you can do...like studs, recvr groove on the deck, copper gaskets, burnelling [I think thats how to spell it], porting and polishing too.

The actual o-ringing is not that expensive, its the labor and the gaskets that add up fast.
I was into mine for just under a grand. That included dumping the coolant and a new t-stat. Prices will vary.

PourinDiesel

I have seen 3 stock gaskets take a dive @ low 40's to high 30's in boost, and they were not HO's.
It depends alot on the driver, and how much you use your power.
Also, of course letting the truck warm up to operating temp.

If you want your truck to hold the 50psi or whatever for a sustained period, I would recommend at least retorquing your factory bolts to spec.
Or get ready for a failure.

If anyone has any questions let me know, I'll pm the directions.

Yeah O ringing is not that bad, if you know how to pull and install the head yourself.
I have about $500 in mine (total).

Scotty your 3rd gen uses a different headgasket then what you are used to seeing, standard O ringing will not work with it (if you use the 03 headgasket).

--Justin

Proram

Iv'e seen 60 numorus time w/ my stock gasket and the twins, when i pulled it to o-ring and stud it the gasket looked incredably good. no signs of distortion at all. now granted it wasnt gonna take it much longer , but it will take it on occasion, Saw 100 on the o-ringed head at least twice but then it let go, but mainly due to a O-ring issue. took the gasket out in 9 different places now that issues been resolved, so we'll se how much it'll take in the spring.

Scott

Scotty

[quote author=PourinDiesel link=board=7;threadid=22965;start=0#msg215896 date=1070198151]

Scotty your 3rd gen uses a different headgasket then what you are used to seeing, standard O ringing will not work with it (if you use the 03 headgasket).

--Justin

[/quote]

That should explain why some folks are getting away with higher pressures with twins on the 3rd gens then. Now I just gotta get past the rail limits for fuel.
Thanks for the input.

Scotty