Head stud Thread

Newt Wolfsburg Wizard

478 posts · joined Mar 2008 · 10 Dec 2008, 8:36 pm

#683979

Hi Guys,

I was thinking about running a tap through the threads in the case (8mm) before assembling.

Does anyone know what size tap to use?

Cheers

Newt

It is as it is - If you didnt enjoy today, you've missed the opportunity.

1500S Custom Title Time!

1,418 posts · joined Mar 2005 · 10 Dec 2008, 8:56 pm

#683990

M8 x 1.25

DH

Newt Wolfsburg Wizard

478 posts · joined Mar 2008 · 10 Dec 2008, 8:56 pm

#683991

Cheers

Newt

It is as it is - If you didnt enjoy today, you've missed the opportunity.

skelaaleks Seriously Crusin Dubber

116 posts · joined Apr 2008 · 18 Dec 2008, 6:55 am

#684935

hey just thort I would let you know not to do them up more then 30 ft lb the vw book says 25-27 ft lb

Cheers Aleks

13bt aztec

1303Steve Scirocco Rare

8,650 posts · joined Aug 2002 · 18 Dec 2008, 8:30 am

#684942

Hi

Run a good quality tap & die over everything.

Steve

matberry Moderator Go hard or go home

8,114 posts · joined Mar 2006 · 18 Dec 2008, 11:51 am

#684968

1303Steve wrote:Hi

Run a good quality tap & die over everything.

Steve

👍

Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE

1303Steve Scirocco Rare

8,650 posts · joined Aug 2002 · 18 Dec 2008, 12:47 pm

#684974

Hi

Thanks Matt.

On the subject of head studs, give them a really good clean on a wire brush and then polish them up in kero or similar with some wet n dry so that they are spotless, that way when your fitting your pistons they wont sit in any rusty or greasy crap before you fit your barrels.

Steve

Joel Now containing 100\% E-Wang

9,368 posts · joined Feb 2006 · 18 Dec 2008, 3:48 pm

#685013

skelaaleks wrote:hey just thort I would let you know not to do them up more then 30 ft lb the vw book says 25-27 ft lb

Cheers Aleks

even thats to much
stock 8mm studs are 18-19 ft lb and 10mm are 22-23 ft lb

non OE ones can snap over that
ive got proof of that under the house 😂

Newt Wolfsburg Wizard

478 posts · joined Mar 2008 · 18 Dec 2008, 7:46 pm

#685049

Joel

How about Chrome Molly for tension?

Newt

It is as it is - If you didnt enjoy today, you've missed the opportunity.

skelaaleks Seriously Crusin Dubber

116 posts · joined Apr 2008 · 18 Dec 2008, 8:09 pm

#685051

hey mate it's not the bolt it's the case that let's go
And the vw book say 26 to 27 I just checked

Cheers Aleks

13bt aztec

Joel Now containing 100\% E-Wang

9,368 posts · joined Feb 2006 · 18 Dec 2008, 8:59 pm

#685073

it would just be a manual not a "vw" book
factory tension rates for 8mm studs like i said earlier are 18-19 ft lb

it can be either or that lets go
ive had an engine with 3studs that have snapped
its usually the the twin port engines with 10mm studs and no case savers that pull the threads

newt im running scat chrome molys in my 1776 and i just took them to 25 initially then only 20 later when i put my copper shims in
10psi of boost and no dramas yet
but boris told me theyre fine upto 30ft lb

skelaaleks Seriously Crusin Dubber

116 posts · joined Apr 2008 · 20 Dec 2008, 3:29 pm

#685323

Ok then my book must be wrong

But mine are still fine so we will see how it goes

13bt aztec

Joel Now containing 100\% E-Wang

9,368 posts · joined Feb 2006 · 20 Dec 2008, 3:56 pm

#685327

its not "wrong" it just varies from manual to manual
but the original vw spec tensions were way less

a block with case savers and good german studs would be ok but if u try that with brazillian studs trust me i know from experience they snap

skelaaleks Seriously Crusin Dubber

116 posts · joined Apr 2008 · 21 Dec 2008, 10:28 pm

#685485

So the german motors are better built ?
Also what are case savers? Are they just helli coils?

13bt aztec

1303Steve Scirocco Rare

8,650 posts · joined Aug 2002 · 21 Dec 2008, 10:58 pm

#685491

Hi

Case savers are a solid insert, I think that they are 12mm OD with a 8mm thread internal thread.

Steve