line honing

[1fast97gsx]

what exactly is this and why is it needed to install arp main studs? I have my engine apart again and I'm thinking about installing a set of arp mains ... but why is line honing necessary? Like what's the difference between getting a set of new stock bolts or installing a set of arps as far as machining?

 

[98TsiAWD]

The ARP studs are probly a little thicker than the stock ones, which will cause them to push some material outwards towards your bearings. Same thing it does with rod bolts, so they have to be rerounded and such.

 

[1fast97gsx]

The ARP studs are probly a little thicker than the stock ones, which will cause them to push some material outwards towards your bearings. Same thing it does with rod bolts, so they have to be rerounded and such.

I called my machine shop and he said no machining would be needed to install arp mains on my block ( pretty reputable shop used by ams ) ... on the forums I read otherwise though. I don't understand how thicker studs would affect it as long as they still all fit through the girdle holes fine. I'm assuming the stock bolts screwed in are all centered in the girdle holes on a properly installed crank so if they are all centered and the studs still fit through the holes they should just bolt right in right??

 

[92awddsm]

Clamping force is also greater using a stud instead of a bolt, even at the same torque. This in turn distorts the main caps and saddles. Align honing is used to resize and realign the main journels in a block.

 

[swordfish]

Align honing (boring) the crank saddles with makes sure that they are all straight and true. The process allows for all them the be honed at the same time ensuring that everything is spot on. It also helps limit drag on the crank.

jeff

 

[Turbo 2g awd]

I was always told that you should line bore the mains if you change the bolts or studs. I had it done on my motor when SBR built my 6 bolt.

 

[Strm Trpr]

All of these guys pretty much nailed it.
I have a post here that NosLaser wrote, and it may be worth looking into.
You are a brave soul for rebuilding your 7-bolt?
But if you follow some suggestions from some wisemen, then perhaps you will build a 7-bolt that will never crankwalk....
In this post, they mention how Nissan, Toyota, and some other high end
performance engine builders dowel pin their main caps or girdle's from the factory.....
Ever hear of their thrust bearings failing?
Read this document, and it may be worth your while and money to have your
machine shop dowel pin your block and main girdle...

 

[Suparata]

I cannot believe that you ask a question like this. Do you even read the threads you start?

 

[TSIfreek]

I would find another machine shop. Your engine is out again isnt it?? Why?? I would find a builder who knows the in and outs of these motors. I can recomend one to you if needed. and he knows what he is doing.