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Head bolt torque settings 

 

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 Post subject: Head bolt torque settings
Posted: Sat Jan 05, 2013 6:34 pm 
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Hi guys,

I see in all the literature it says to torque head bolts to 40nm, then 90 degrees.... But I heard that 40, then 80, then 110 may be better?

What say you? 8-)
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 Post subject: Re: Head bolt torque settings
Posted: Sat Jan 05, 2013 6:58 pm 
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There is two different specs depending on the car and I'm not sure what made them change...

These being the genuine ford manual specs...

EA-EL (I think) were 40Nm + 90deg
AU was 30Nm + 120deg

If you are saying 40Nm then to 80Nm then to 110Nm that isn't right? You have no units beside your numbers though so I'm not sure what you're saying?

When I fitted the AU VCT head to my falcon I used 30+120

Cheers,
Tim

 

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Last edited by TimmyA on Sat Jan 05, 2013 7:00 pm, edited 1 time in total.

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 Post subject: Re: Head bolt torque settings
Posted: Sat Jan 05, 2013 6:59 pm 
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TimmyA wrote:
There is two different specs depending on the car and I'm not sure what made them change...

EA-EL (I think) were 40Nm + 90deg
AU was 30Nm + 120Nm

When I fitted the AU VCT head to my falcon I used 30+120

Cheers,
Tim



Yes, I have an EBII - so the literature for the thing says 40 + 90 deg, but someone said 40,80,110 gives better results...
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 Post subject: Re: Head bolt torque settings
Posted: Sat Jan 05, 2013 7:00 pm 
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see above^^^

 

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 Post subject: Re: Head bolt torque settings
Posted: Sat Jan 05, 2013 7:01 pm 
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I made an edit...

 

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 Post subject: Re: Head bolt torque settings
Posted: Sat Jan 05, 2013 7:02 pm 
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TimmyA wrote:
I made an edit...


Yes I mean 40nm, then 80nm, then 110nm - It was suggested to me that those in motorsport circles use those settings instead of the degrees method
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 Post subject: Re: Head bolt torque settings
Posted: Sat Jan 05, 2013 7:05 pm 
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Na you can't do that with TTY bolts... They don't work like that...

You do them to the correct torque and then you stretch them past their yield point and this can only be measured by the degrees... Not with Torque...

For them to do that they must be using Non TTY products maybe that includes such things as stud kits or just high tensile bolts?

Cheers,
Tim

 

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Visuals: FG XR Wheel, XR Front, 17's, BA 5 Spd Shifter, BA Ghia Window Switches, NL Cluster
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 Post subject: Re: Head bolt torque settings
Posted: Sat Jan 05, 2013 7:08 pm 
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TimmyA wrote:
Na you can't do that with TTY bolts... They don't work like that...

You do them to the correct torque and then you stretch them past their yield point and this can only be measured by the degrees... Not with Torque...

For them to do that they must be using Non TTY products maybe that includes such things as stud kits or just high tensile bolts?

Cheers,
Tim


Ah I see, this makes sense to me now... so once they start to stretch, the torque values mean nothing.

Thanks :mrgreen:
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 Post subject: Re: Head bolt torque settings
Posted: Sat Jan 05, 2013 7:28 pm 
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ahh... see in my mechanics guide to cars, the section for headbolts states the specific info of :

for head bolt the exact amount to do them up is f**ken tight. :lol: :lol: :lol: :lol:

 

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 Post subject: Re: Head bolt torque settings
Posted: Sat Jan 05, 2013 7:33 pm 
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Benny D wrote:
ahh... see in my mechanics guide to cars, the section for headbolts states the specific info of :

for head bolt the exact amount to do them up is f**ken tight. :lol: :lol: :lol: :lol:


That pretty much covers it... Meter long breaker bar plus big bit of thick walled pipe... :-?

Cheers,
Tim

 

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Performance: Complete AUII VCT Wiring & Power Train, Pacey Headers, 2.5" Exhaust, Exedy Clutch, DBA Rotors
Visuals: FG XR Wheel, XR Front, 17's, BA 5 Spd Shifter, BA Ghia Window Switches, NL Cluster
Tunes: 8" Pioneer Sub, JBL Speakers, Clarion Double DIN Headunit

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 Post subject: Re: Head bolt torque settings
Posted: Sat Jan 12, 2013 6:41 pm 
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and an angular torque gauge, super cheap has em for $15, good investment as there are a few other bolts that use TTY fastening.

 

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 Post subject: Re: Head bolt torque settings
Posted: Sat Jan 12, 2013 7:58 pm 
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If you are using a composite head gasket, use 40Nm + 90 degrees. If you use the AU MLS head gasket, use 30Nm + 120 degrees.

 

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