What boost pressures will Arp studs hold with out O-ringing the head for now?

[JaMan]

I am doing this in steps and it's easier to put studs in and wait for a later time to o-ring the head. With just the studs, what will it hold with a stock typs HG. I doubt I will ever make over 55-58psi boost and the drive pressure on the 64/14 is relatively low, so will it hold or am I going at this all wrong?



Jared

 

[woodsrat]

From what we are seeing around here with the 12mm studs and a stock gasket they are holding to around 70 lbs. I would not push that i a daily basis but with what you think you are going to be at i think you would be fine.

 

[CumminsAholic]

70 Lbs on a second gen without o-rings... You sure you aren't thinking about the 3rd gen trucks? I thought 70 was starting to push it even with o-rings?

Corey

 

[EBung]

Just curious what egt #s you hit before and after the boost cooler JaMan?My sig is very similar to yours I noticed thanks in advance.

 

[LAMiller]

yes 70 is pushing it! I just blew mine with ARP Studs and am running 55-60 lbs and it only took 2 months for it to blow

 

[Hohn]

I'd think 50 would be safe with stock HG and studs.

After that, you're in no-man's land.

 

[Tcolesanti]

I ran 51psi all last season with a stock head gasket and stock head bolts, not even retorqued.

 

[RHARVEY]

I have 12mm head studs,stock head gasket and twins... but the blow off valves are set at 50lbs. .



Rick

 

[RBratby]

what about if you used a 20thous over marine gasket with studs. how much boost can that take?

 

[Hohn]

Hard to say. Timing and drive pressure have a lot more effect on HG than does boost pressure.

I wouldn't think a . 020 over gasket would buy you more than 5psi or so of holding.

 

[JaMan]

Just trying to buy some time and get part of the cost out of the way. As of now I can hit 47-48 psi w/o water and w/water it gains 5psi so if just studs will buy me 57-58 or so then that will work, now with the wg set at 41psi it will overrun a little and with water it will get to 47psi and settle to 45, but could use more boost to cool things down, it will still hit 1550* with Windsheild wipper fluid and a bottle of Heet mixed in. On the lower end I think it shows 150* drop at about 25psi holding steady pressure at 25psi. Will O-ring at a later date just can't have the truck down that long right now.



Jared

 

[Turbo Thom]

If you're not 0 ringing the head, why the studs? Stock head bolts will hold just as well. To me you're putting the cart before the pony. I really don't understand.



. . Preston. .

 

[rivercat]

Tcolesanti, what charger and box? if you don't mind telling maybey pm me?

 

[Forrest Nearing]

If you're not 0 ringing the head, why the studs? Stock head bolts will hold just as well. To me you're putting the cart before the pony. I really don't understand.



. . Preston. .

then why use studs at all?



studs have more tensile strength... so they'll hold better.

 

[Hohn]

If you're not 0 ringing the head, why the studs? Stock head bolts will hold just as well. To me you're putting the cart before the pony. I really don't understand.

. . Preston. .

OK, some explain to me how a 160KSI factory bolt holds "just as well" as a 220KSI ARP stud

Clamping force doesn't matter?

 

[Tcolesanti]

Tcolesanti, what charger and box? if you don't mind telling maybey pm me?

Charger was a 64/14 HTT unit, a drag comp, and some BFI's :-laf :-laf :-laf

 

[rivercat]

that would probobly be close to 1:1 at 48-50 right meaning not so risky as say pushing a hx 40 or 35 to the high 40s right?

Should I be ok with my 62/14 up to say 48 for a while?

They say the ETHs are easyier to blow because of the already high cylinder pressures caused by the higher C/R

Thinking about converting my pyro to a D/P gauge for a bit to see whats going on at 40-50 lbs boost

 

[Tcolesanti]

I switched from an Autometer Pyro(1600*) to an Isspro Pyro (1800*) because the Autometer gauge was reading down around the first "e" in Meter, so after the swap it would go to about 1750* at the end of the pull.

I would be more worried about the HO engine due to more compression for sure, but 48psi from that charger should be fine, no garuntees though.

 

[JaMan]

I'm going to oring it just can't take the truck down right now but I can but the studs and put them in and I'm hoping they will buy me alittle more confort zone. What will the stock HG and no o-rings be good for? Seems no one really knows guess I'll just have to see for myself.



Jared

 

[CumminsAholic]

How much will it hold? Well... How good is your luck?? I'd say you're pushing your luck at anything over 50psi. You may be lucky and have it hold at 70psi, or it could let go at 45psi. My opinion... . (I have o-rings. Head torqued to 140) I'd have no problem pushing my truck to 60psi (should be good to well over that), but I wouldn't want to go over that much because I don't have very good luck, if it can break it'll happen to me, so I always try to make everything I do hold a little more than I need it to. So once again... How lucky are you?

Corey