Head Bolts Torque Setting

1. Mikol Established Member Joined: Jun 2008 Somewhere between Bedford and Brixworth Posts: 2373 106 XS 16v Driveway Ornament

   #1 11th December 2013, 12:40

   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
2. Kwik-Nick L-plater Joined: Jan 2012 Watford Posts: 49

   #2 11th December 2013, 14:41

   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

   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.
3. welshpug Saxperience Forum Bum Joined: Jul 2010 South Wales Posts: 3078 ZX 16v, 205 GTI, 309 Goodwood, 405 MI16.

   #3 11th December 2013, 14:59

   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
4. Gandi699 Saxperience Post Whore Joined: Apr 2011 Posts: 9100 Amazon green VTR 16v, Inferno RS clio 182

   #4 11th December 2013, 15:46

   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
5. Mikol Established Member Joined: Jun 2008 Somewhere between Bedford and Brixworth Posts: 2373 106 XS 16v Driveway Ornament

   #5 11th December 2013, 18:59

   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.
6. welshpug Saxperience Forum Bum Joined: Jul 2010 South Wales Posts: 3078 ZX 16v, 205 GTI, 309 Goodwood, 405 MI16.

   #6 11th December 2013, 19:28

   they will all vary, that's why they used angle tightening.
   
   120 degrees isn't exactly hard, its one third of a turn.
7. Mikol Established Member Joined: Jun 2008 Somewhere between Bedford and Brixworth Posts: 2373 106 XS 16v Driveway Ornament

   #7 11th December 2013, 20:11

   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.

   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.
8. welshpug Saxperience Forum Bum Joined: Jul 2010 South Wales Posts: 3078 ZX 16v, 205 GTI, 309 Goodwood, 405 MI16.

   #8 11th December 2013, 21:28

   so why the hell do you want to know that?