WHAT POWER CAN FACTORY MAIN STUDS HANDLE

[nextlevel]

Hey just wanting to kno wat power factory main studs handle as wev started building a motr for 400-450kw and wanted to kno if factory main studs be fine

[loner]

lol. it amazes me that someone building a motor capable of 450 kw would come on here and ask that question.

makes me think that you don't have a sh1t show of making an engine that can handle that power level.

[nextlevel]

 loner said:

lol. it amazes me that someone building a motor capable of 450 kw would come on here and ask that question.

makes me think that you don't have a sh1t show of making an engine that can handle that power level.

it amazes me too. I heard from ppl thy be fine then i hear from others change them. Thought id ask the good ol clubsubbers as theres alot of knowledgable ppl on here.

[loner]

 nextlevel said:

it amazes me too. I heard from ppl thy be fine then i hear from others change them. Thought id ask the good ol clubsubbers as theres alot of knowledgable ppl on here.

Seriously though, if you are going to build a subaru engine capable of 400 to 450 kw, you must have built many engines

in the past and have attained a whole lot of first hand knowledge... surely.

Edited May 21, 2015 by loner

[lachlan]

wtf are you going to do with a 400 kw wrx ? is it a race car or just for bragging ?

[Guest]

 lachlan said:

wtf are you going to do with a 400 kw wrx ? is it a race car or just for bragging ?

Drag car in low 11s iirc.

Get a proper builder dude dont want to end up fckd over, out of pocket and car like minhaaj.

As for the q theres no real answer they could cause issues at any level. Replace them with arp if shooting for 350wkw- as you will only want more later.

[hijacka]

Lol ARP 260-4701 can be had for about $250 fairly sure factory subaru oem headstuds will cost about that anyway and you certainly wouldn't re use them.. not that i think they will handle 400kw so why would you even consider using factory studs when your doubling the factory output? i would use L19

Edited May 21, 2015 by hijacka

[hijacka]

FWIW when your finshed torquing the head down leave it over night and re torque the head the following day.. i end up with 95lbs on a/b and 90 on the rest using arp have always found the next day will need another 5lbs or there abouts

[hijacka]

whoops main studs.. hmmm factory will be fine just makesure you replace the seal washers.. arp would be alot better! they have a very nice mains tud kit thats worth getting imo you'll pay around 500 for it but its a nice bit of kit

[hijacka]

Subaru new oem

http://www.ebay.com/itm/Subaru-Main-Bolts-Case-Bolts-Kit-EJ20-EJ25-EJ22-Block-Bolts-OEM-NA-Engine-/190755389085?fits=Make%3ASubaru&hash=item2c69e83e9d&vxp=mtr

[boon]

 hijacka said:

FWIW when your finshed torquing the head down leave it over night and re torque the head the following day.. i end up with 95lbs on a/b and 90 on the rest using arp have always found the next day will need another 5lbs or there abouts

To throw a cat amongst the pigeons, any reason you torque to a value rather than to stretch?

I'm cautiously building my first motor at the moment and anything like that is getting done to a stretch value not a twist one... partly because so much can affect torque value, like lubricated vs dry threads, whereas stretch (and inherently clamp force) is a constant.

[lachlan]

lol at measuring stretch on the the main studs . yeah def measuring stretch on something a foot long in thou .

like the training for just about every industry standard in every thing says . "as per manufacturers recommendations"

im against re torquing stuff . unless specified . you will find you are just squashing the head and can keep torquing for ever if you did . the proper clamp ( seal ) is achieved as a by product of bolt tension vs material compression . re torquing it isnt acheving anything than maybe removing some elasticity of head / block that is probably required .

[hijacka]

 boon said:

To throw a cat amongst the pigeons, any reason you torque to a value rather than to stretch?

I'm cautiously building my first motor at the moment and anything like that is getting done to a stretch value not a twist one... partly because so much can affect torque value, like lubricated vs dry threads, whereas stretch (and inherently clamp force) is a constant.

If you use arp head studs you use the lub that comes with it and install to there specs however i go 30/60/85/ then 95lbs on a and b and 90 on the rest. just remember to leave it over night and re-do the last sequence, Oem bolts are stretch bolts thats why you do 90' swings backoff blah blah.

[boon]

 lachlan said:

lol at measuring stretch on the the main studs . yeah def measuring stretch on something a foot long in thou .

like the training for just about every industry standard in every thing says . "as per manufacturers recommendations"

im against re torquing stuff . unless specified . you will find you are just squashing the head and can keep torquing for ever if you did . the proper clamp ( seal ) is achieved as a by product of bolt tension vs material compression . re torquing it isnt acheving anything than maybe removing some elasticity of head / block that is probably required .

Subaru case bolts are a bit of an exception really. But rod bolts, that kinda thing, if you dig hard enough the manufacturer usually does specify a stretch value as well as a torque option.

As long as it works though, I guess.

[nextlevel]

 lachlan said:

wtf are you going to do with a 400 kw wrx ? is it a race car or just for bragging ?

Bragging why would i do that. And no its a street daily.

[nextlevel]

 evowrx said:

Drag car in low 11s iirc.

Get a proper builder dude dont want to end up fckd over, out of pocket and car like minhaaj.

As for the q theres no real answer they could cause issues at any level. Replace them with arp if shooting for 350wkw- as you will only want more later.

True is manaj car screwd . Nah im building again. Already got all the parts just purchased arp main stud kit 2 hours ago online thats the last peice of the puzzle. .

10sec the goal this nytwars. Already got 11.4 missing all the way down lol

[EJ20T]

Actually measuring the stretch is impossible on the case BOLTS because you cant get at the other end when tightening to make a measurement and they are BOLTS!. head studs etc are possible. angle torque is the most accurate method when stretch cant be measured.