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teknob
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« Reply #2 on: September 30, 2009, 04:11:50 pm » |
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Anders Dinsen
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« Reply #7 on: October 01, 2009, 06:22:52 am » |
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well because of the step high from the bolt you get a more exact boltaxisforce then you get from the resistance in the thread. some small dirt etc can make you believe you have enough force in the head but you actually dont
I understand your point there, however, if you torque a bolt up to the specified torque, then turn it a given angle (which is just the same as adding torque if you know the thread), how can that be different from just torqueing up a bolt to a (higher) torque? I think the two methods are just different. Dirt can ruin the numbers either way... and I don't hope there will be any dirt/rust in Karstens cylinder block when he does that... But I'm speculating here... can we find some authoritative info here? /Anders
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1982 Talbot Matra Murena 2.2 prep 142 (under restoration) 2017 BMW i3 "Charged Professional" 94Ah 2024 VW id.buzz Pro
Used to own: 2001 Renault Matra Grand Espace "The Race" V6 24v 1997 Renault Matra Espace 2.0 8V 1987 Renault Matra Espace J11 2.2
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roy4matra
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« Reply #9 on: October 02, 2009, 02:22:21 pm » |
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dont they have a number for how many degrees the bolts should be turned after a specific torque? ![Shocked](http://www.matrasport.dk/forum/Smileys/default/shocked.gif) its very rare the resistance is fixed in boltholes No. You are talking about a modern engine, where you are given a soft torque and then a torque angle which adds the final torque. This stretches the bolts, and they don't need to be re-torqued after a set mileage. However, with this system, you often need to replace the head bolts, since once they have been stretched, they cannot be re-used. You must always measure the lengths, and compared with the spec. The Murena uses older designed engines where you are given the actual torque and the bolts are not stretched. However, you must re-torque the head bolts after approx. 1000 kms and re-set the valve clearances. If you do not, the head gasket which will have settled, may blow. Roy
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