Saxo Engine/Performance If you're interested in tuning Saxo engines, or if you need to know something which is engine related... this is the place for you. |
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11th December 2013, 12:40
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#1
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Established Member
Join Date: Jun 2008
Location: Somewhere between Bedford and Brixworth
Posts: 2,373
Car(s): 106 XS 16v Driveway Ornament
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Head Bolts Torque Setting
Hey guys.
Is anyone with a 1.6 iron block engine (not bothered if 16v or 8v) able to check the torque on their head bolts for me?
I know the torque sequence is 20Nm then an angle tighten. But it'd make my life a lot easier if someone just went out with their torque wrench and incrementally increased the torque setting until it stopped 'pinging', and came back with whatever that number was. It doesn't have to be to the 0.00001 Nm as I'm building in some generous safety factors. I just need to know the final torque on the bolt for my new engine build, and angle tightening sequences are crap.
If anyone can help or contribute it'd be very much appreciated.
Cheers
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11th December 2013, 14:41
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#2
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L-plater
Join Date: Jan 2012
Location: Watford
Posts: 49
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Quote:
Originally Posted by Mikol
Hey guys.
Is anyone with a 1.6 iron block engine (not bothered if 16v or 8v) able to check the torque on their head bolts for me?
I know the torque sequence is 20Nm then an angle tighten. But it'd make my life a lot easier if someone just went out with their torque wrench and incrementally increased the torque setting until it stopped 'pinging', and came back with whatever that number was. It doesn't have to be to the 0.00001 Nm as I'm building in some generous safety factors. I just need to know the final torque on the bolt for my new engine build, and angle tightening sequences are crap.
If anyone can help or contribute it'd be very much appreciated.
Cheers
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The manufacturer tightening torque is 20nm + 130 degree + 130 degree. Angle tightening is better, because you can never get the same torque with the spanner. The bolts can have different resistance in the thread or from the friction between the bolt and the head. That's why all the manufacturers give initial nm (when resistance is not so big) to set the bolts to even level and after that use the angle tightening.
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11th December 2013, 14:59
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#3
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Saxperience Forum Bum
Join Date: Jul 2010
Location: South Wales
Posts: 3,074
Car(s): ZX 16v, 205 GTI, 309 Goodwood, 405 MI16.
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8v setting is 20Nm then 120 degrees and another 120 degrees.
tighten in a spiral starting in the middle front, then rear, then to the right then front then over to the other side of the middle ones and so on.
16v is 20Nm then 130 130.
so it does matter if its 8v or 16v
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11th December 2013, 15:46
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#4
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Saxperience Post Whore
Join Date: Apr 2011
Posts: 9,100
Car(s): Amazon green VTR 16v, Inferno RS clio 182
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To the OP bit of a risk of snapping a bolt doing it that way? Done that before on a k-series which is easier to get a snapped bolt out than one of these TUs still a pain in the arse though
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11th December 2013, 18:59
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#5
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Established Member
Join Date: Jun 2008
Location: Somewhere between Bedford and Brixworth
Posts: 2,373
Car(s): 106 XS 16v Driveway Ornament
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I know the sequence. I'm not suggesting doing it another way. I know exactly why an angle tighten procedure is specified.
I'm only suggesting measuring the final torque so I can get an estimate of the axial force in the head bolts.
16v or 8v doesn't matter to me. I'm looking for a ballpark figure.
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11th December 2013, 19:28
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#6
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Saxperience Forum Bum
Join Date: Jul 2010
Location: South Wales
Posts: 3,074
Car(s): ZX 16v, 205 GTI, 309 Goodwood, 405 MI16.
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they will all vary, that's why they used angle tightening.
120 degrees isn't exactly hard, its one third of a turn.
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11th December 2013, 20:11
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#7
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Established Member
Join Date: Jun 2008
Location: Somewhere between Bedford and Brixworth
Posts: 2,373
Car(s): 106 XS 16v Driveway Ornament
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Quote:
Originally Posted by welshpug
they will all vary, that's why they used angle tightening.
120 degrees isn't exactly hard, its one third of a turn.
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You haven't read what I posted. I just want to know a ballpark torque figure. It'd take ten seconds for someone in the middle of a build to measure it. I'm sure it'll be in the region of 100 Nm but I'm looking for some evidence.
For the last time, I am NOT suggesting torquing the head bolts in any way other than the correct way.
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11th December 2013, 21:28
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#8
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Saxperience Forum Bum
Join Date: Jul 2010
Location: South Wales
Posts: 3,074
Car(s): ZX 16v, 205 GTI, 309 Goodwood, 405 MI16.
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so why the hell do you want to know that?
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