no takers?

I guess I will have to wait for ARP to reply

 

I thought about that once let me know what you find out.

 

bump for an answer as well. I got head studs and rod bolts... i wanna know if i should get main bolts or studs or w.e

 

Bump for more knowledge.
:tmyk:

 

main studs are just more insurance. not really a must unless going for big power. most people do them when building an engine as a precaution and why not while your already inside the motor. small cost for more insurance. hard to put a hard horse power # were studs are needed due to lack of them failing. not sure if it can be proven on any 4b11 fail yet. the evo 4b11 has a 4 bolt main anyway. if your on a super tight budget it would be a corner to cut. who knows if the block or sleeves are even good for a long period of time at high power levels, just to new to tell.

 

basically, for 100 bucks, do them. They'll require an align hone, which will cost a bit too, but in the end its the proper way to build a motor.

 

studs cost about $175. comes to about $450 after paying for the machining to do main studs. still worth it if your making big #'s

 

reply from ARP:

Regardless of bolts or studs when switching from the factory bolts you
should have the line bore checked, it is always a good idea to switch to
studs whenever possible, they will give you a much more accurate torque
and the preload will be much more precise, Plus they will not have the
torque scatter or twisting torque that you get from a bolt.

Not particularly useful...

So I don't really see the need to upgrade to aftermarket units at al..

 

Stay with stock and avoid the headache, out of all the builds I have seen never once has there been an issue with the stock 4 bolt main holding power.

 

at what tq level do you think they need to be changed?

 

It is one of those, what the hell, the engine is apart anyway items. Do you need to do it? No. Should you? I don't know. Did I? Yes.

Most major motor builds replace the stock bolts with stronger studs. When you're spending 10K+ to build a motor, what the hell is 450 bucks?

 

because less is more IMHO

the less things I need to change the better...

need being the operative word

 

:+1:Less new points of failure.

 

ermm.. replacing w/ arp main studs eliminates a point of failure, not introduces a new one.

 

:+1:

 

Hi Guys,

Does anyone have any _real_ experience when choosing main bolts/studs?

specifically - when and why should I be changing the stock bolts to studs?

Also I see that ARP make "Main Bolts" AND "Main Studs". Whats the difference?

I understand that when going from Bolts -> Studs you should get your block align honed to make sure there wasn't any distortion when installing the studs.

Thanks in advance!

Cheers
D.

Clamping force ! length/Shape retention !




.

 

why is that?