BHG. But why?
- Thread starter MDCmotorsports
- Start date
ok, jdub beat me to the bolt instruction sheet, but I have a question about torque/lubricant.
It states 85ft/lb with arp moly lube and 110ft/lb with 30wt oil. That is a 29.4% increase.
Would that same apply to Aluminum where they recommend 75ft/lb with arp moly lube.
Would that be 97ft/lb with 30wt oil?
It states 85ft/lb with arp moly lube and 110ft/lb with 30wt oil. That is a 29.4% increase.
Would that same apply to Aluminum where they recommend 75ft/lb with arp moly lube.
Would that be 97ft/lb with 30wt oil?
That would be a question for ARP...give them a call. Based on the note at the bottom, it looks like they are very specific on the lube used...I doubt you can interpolate the torque values based on a different lube. The bolts come with moly lube, why not just use it?
well, now, it's a re-use issue 
That's why I was curious about the percentage increase and 30wt oil.
edit: I just ordered more ARP lube to be safe.
That's why I was curious about the percentage increase and 30wt oil.
edit: I just ordered more ARP lube to be safe.
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I would be pretty confident in saying that 105 ft-lbs (with moly !!) killed this gasket. That is equivalent to like 230% of the Toyota factory spec (58 ft-lbs with motor oil). A big long swiss cheese sausage head like the 7M will not be flat with that much pressure on 14 discrete bolts. You will also pull up the block deck around the bolt holes.
I still go by my statement that the ARP 81ft-lbs (with moly) spec is too high for a non-ferrous head. Although, as JDUB has correctly pointed out, there is no other spec with the ARP stud kit instructions for non-ferrous apps like there is for the head bolt kit. I believe it should be derated by 12% for aluminum applications due to the 1.7 times greater thermal expansion rate of aluminum compared to iron.
ahh but what do I know... torque it up 'til it snaps, then back it off half a turn :biglaugh:
I still go by my statement that the ARP 81ft-lbs (with moly) spec is too high for a non-ferrous head. Although, as JDUB has correctly pointed out, there is no other spec with the ARP stud kit instructions for non-ferrous apps like there is for the head bolt kit. I believe it should be derated by 12% for aluminum applications due to the 1.7 times greater thermal expansion rate of aluminum compared to iron.
ahh but what do I know... torque it up 'til it snaps, then back it off half a turn :biglaugh:
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Well I installed my head gasket today with moly lube @ 80 ft lbs.
We'll see what happens in the weeks to come.
We'll see what happens in the weeks to come.
I just replaced my HG with a stock gasket and did ARP Studs and torqued them to 81 ft lbs. then retorqued there again about 2 weeks later to 81 ft lbs. again. Running 8 psi right now with no problems. Once I get a new DP and Ext, I will probably see what 12 will do but won't go higher then that.
