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| mrnasty |
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why does the tourque of the headbolts matter so much? cant you just go to factory specs?
_________________ Cougar Zero makes my pants fit nice. |
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maybe they loosen... the torque specs from the factory were not intended for use with a turbo
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| ebs_4l |
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if youve read the article on this car you will know they had big trouble holding the gasket in, they came up with their own torque which had not yet failed, after 40+ 400m runs
_________________ EB 4L, 8.4:1, R154, GT4202r, 4in exhaust, Greenslade Engineering exhaust manifold, plenum chamber, 90mm throttle, Garrett W2A cooler, Surecam custom, autronic SM4, Bosch 120lb, Crane HI-6, LX-92, LM-1, Turbosmart Reg, 2x bosch 044, turbosmart 48 gate. 470kw+ @ 18PSI |
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| mrnasty |
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ah ok, thanks for that fellas.
_________________ Cougar Zero makes my pants fit nice. |
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| EBXR8380 |
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Its the head bolts that stretch anyway..Causing head to lift...
_________________ As in ZOOM 126 edition |
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| ebs_4l |
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EBXR8380 wrote: Its the head bolts that stretch anyway..Causing head to lift...
whats your point? apparently the problem can be fixed with a different torque
_________________ EB 4L, 8.4:1, R154, GT4202r, 4in exhaust, Greenslade Engineering exhaust manifold, plenum chamber, 90mm throttle, Garrett W2A cooler, Surecam custom, autronic SM4, Bosch 120lb, Crane HI-6, LX-92, LM-1, Turbosmart Reg, 2x bosch 044, turbosmart 48 gate. 470kw+ @ 18PSI |
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| Andrew J |
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Does anyone know what grade the headbolts are? Id be wondering whether getting grade 9 bolts would solve some of the problems or something?
_________________ The problem with America is stupidity. I'm not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself?
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| EBXR8380 |
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ebs_4l wrote: EBXR8380 wrote: Its the head bolts that stretch anyway..Causing head to lift... whats your point? apparently the problem can be fixed with a different torque With the expansion and contraction of alloy which is heaps, it breaks down the stretch or elastisity of head bolt.. BUT on high power boost engines the bolts simply stretch and head lifts!! Often head gasget gets blammed, multy layer metal gagstes helps this issue as they don't blow out..But the issue with head bolt stretch or head lifting is still an issue... Ford have upgraded there head bolts lately anyway and ALWAYS use new head bolts!!! With molly grease under threads and washer...As the alloy tends to grab .... If you think the 6's have issues the V8's with boost its a real concern 3/8 " bolts and there's four of them....
_________________ As in ZOOM 126 edition |
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| ebs_4l |
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yes, i realise all that, but, regardless of all the theories involved, using the different settings stopped the gasket blowing problem
_________________ EB 4L, 8.4:1, R154, GT4202r, 4in exhaust, Greenslade Engineering exhaust manifold, plenum chamber, 90mm throttle, Garrett W2A cooler, Surecam custom, autronic SM4, Bosch 120lb, Crane HI-6, LX-92, LM-1, Turbosmart Reg, 2x bosch 044, turbosmart 48 gate. 470kw+ @ 18PSI |
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ebs_4l wrote: yes, i realise all that, but, regardless of all the theories involved, using the different settings stopped the gasket blowing problem
Or more likely delayed it |
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| EBXR8380 |
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We used aftermarket bolts from memory we torqued to 40 Lb then 90 *...With a bloody long 2" bar....
_________________ As in ZOOM 126 edition |
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| EB on boost |
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If i was building an engine or had the head off the car,i would use arp head studs...they would be stronger than most bolts...
what about using XR6 turbo head bolts? do they fit? |
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| ebs_4l |
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i rekn the head bolts r metric, so arp is out of the question... dunno bout 6t bolts, ill look into it
_________________ EB 4L, 8.4:1, R154, GT4202r, 4in exhaust, Greenslade Engineering exhaust manifold, plenum chamber, 90mm throttle, Garrett W2A cooler, Surecam custom, autronic SM4, Bosch 120lb, Crane HI-6, LX-92, LM-1, Turbosmart Reg, 2x bosch 044, turbosmart 48 gate. 470kw+ @ 18PSI |
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