ARP Main studs

[Rodgman15]

At what point do arp main studs become a necessity? Is there a certain hp/tq number where people recommend using them?

[nynoah]

over 500. Honestly the stock ones are not that bad. You do have to buy brand new ones, they are one time use only.

[vrmm]

I think they'd be a worthwhile purchase if they're like 100$. I've reused my stock ones 4 or 5 times and I'm in the 500whp range. I'm more worried about an asteroid hitting my car. I don't think a hp limit is what should concern you. It should be if you will be pulling the head somewhat often.

[nynoah]

My ARP bolts have paid for themselves many times over in reuse.

[Rodgman15]

I know the oem bolts are stretch bolts, I've also heard you need to align hone the main caps if switching to studs due to their torquing specs or something to that effect.

[zillarob]

Wake me up when the big torque spec debate starts

Kinda looks like the block breaks before the oem bolts, so I say the studs are pretty much pointless.
This is usually a once and done thing. Not sure wtf people are doing to justify them based on being able to reuse.


Oops, thought I was in the s4 section I dont know if this applies to you guys.

[Kronprinz]

I haven't heard of anyone breaking a main bolt, like in any street car, EVER. Has anyone else?

[Avant Nate]

I think they'd be a worthwhile purchase if they're like 100$. I've reused my stock ones 4 or 5 times and I'm in the 500whp range. I'm more worried about an asteroid hitting my car. I don't think a hp limit is what should concern you. It should be if you will be pulling the head somewhat often.

Where have they ever been $100? Because all I see is $200+, so unless you plan on changing the head 10+ times...
Aeb 204-4102
06a 204-4104
Both include tool

[vrmm]

I was saying that they would only be worth it to me if they were only 100$. I know they are more, hence me not having them.. I bought bosch 1000cc injectors for a bit more, you can buy a used hx35 for that much, a good ewg, about a billion things. Not just head bolts... Boring!

[zillarob]

Main studs/head studs? Aw screw it, they'll figure it out

[vrmm]

Haha touche ;) I have my 500ish whp without any sort of aftermarket main stuff. I've never read about people needing them. So I suppose I worry about it as much as a t rex riding an asteroid hitting my car, which is to say not at all. I really like how 95% of the people in the thread(including myself) choose to see it how they wanted.. Or I just misled everyone with the first response

[chris164935]

I've reused my stock ones 4 or 5 times and I'm in the 500whp range.

Reused your stock head bolts 4 or 5 times? Maybe that's why you've had to pull your motor's head so many times...

Anyway, some quick reading regarding the original topic:

For a performance or heavy-duty application, the use of studs is preferred whenever possible instead of main cap bolts, in those instances where a choice is available. Studs provide the ability to obtain much more accurate torque values because the studs don’t twist during tightening as do bolts. Because the studs remain stationary during nut tightening, the studs stretch in one axis alone, providing much more even and accurate clamping forces. Also, because the use of studs results in less wear applied to the block’s threads, this extends the life of the threaded holes in the block over periods of servicing/rebuilding. This is especially important when dealing with alloy blocks. The use of studs also eases main cap installation, and contributes to main cap alignment. There is less chance of main cap walking because the studs remain stationary during cap clamping

Reference: http://www.autoserviceprofessional.c...ving-proper-cl

[vrmm]

Nahh revving too high, je pistons, and sky high egt's is why. Nothing to do with head bolts. Or main bolts.... :)

[Rodgman15]

A dinosaur riding an asteroid, that made me lol. I'll be running almost the same setup as vrmm, HX35, built head and such. From what I'm seeing, it's more or less peace of mind.

[nynoah]

I went with ARP Main studs in my 1.8t block and then transferred them into my 2.0 block. $120 seemed like a reasonable cost to me. But I also put ARP on everything I could.

http://www.performancebyie.com/arp-1...-06a-late-1-8t


Edited to say I just found them now for 63$

http://www.eurospecsport.com/product...e-updated.html

EHK 198 901 06A/B 1.8L Turbo, 99-05 Golf/Jetta/New Beetle/Passat and Audi A4, 10 stud set $63.75

[Kronprinz]

EHK 198 901 06A/B1.8L Turbo, 99-05 Golf/Jetta/New Beetle/Passat and Audi A4, 10 stud set $63.75

This is screwy, and contradictory. 06a didn't come along until 2001 model
I don't see a listing for AEB/ATW. Are they the same ARP main studs as 06a?

[nynoah]

This is screwy, and contradictory. 06a didn't come along until 2001 model
I don't see a listing for AEB/ATW. Are they the same ARP main studs as 06a?

I would call them and ask all those questions.

[Avant Nate]

Well everyone is selling the 204-5402 for cheaper. Which ARP says are for 1.6 and 2.0 blocks. What's the difference?

[Rodgman15]

Should be noted, I'm AEB as well. Pretty sure the 06a is 10mm while the 058 is 11mm, could be mistaken though.

[Kronprinz]

Should be noted, I'm AEB as well. Pretty sure the 06a is 10mm while the 058 is 11mm, could be mistaken though.

You start a thread about main studs, but for some reason, you and everyone else is talking about head studs

[Rodgman15]

You start a thread about main studs, but for some reason, you and everyone else is talking about head studs

negative ghost rider, that's what I was told by a reputable company who will remain unnamed, but I didn't bother with anymore research until I heard from someone with a BT setup. Maybe i'm thinking about a head bolt conversation I had with someone at said company, but there's a size difference in main studs as well between the 2 blocks. I was, and still am talking about main cap studs.

Here's a link to "early" 1.8t blocks

http://www.performancebyie.com/arp-m...and-8v-engines

[Kronprinz]

Well according to techtonicstuning 058 main bolts are 15mm shorter than 06a main bolts
http://techtonicstuning.com/main/ind...oducts_id=1968
http://techtonicstuning.com/main/ind...oducts_id=1969

[Rodgman15]

ECS shows the same thing for the stock bolts. Pretty sure length is different for studs as well.

[Avant Nate]

You start a thread about main studs, but for some reason, you and everyone else is talking about head studs

Lolzn I was confused as well. Completely missed that point. First time I heard someone ask about main studs.