Check Your FAST 92 Bolts?
04-01-2009, 11:16 AM
#1
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Check Your FAST 92 Bolts? I just did a FAST 92 install and am having a problem keeping the 10 long ss bolts, that came with the intake, torqued down. I tried blue loctite, then red (per FAST's recommendation) and they still will not hold the 89"lb torque. I called FAST and they have not heard of the problem. They said they will call some of there high volume buyers to see if they might have seen this issue. Have any of you guys with this intake checked your torque on these bolts lately? I'm thinking it has something to do with the use of stainless steel bots into the aluminum heads.This is not going to work if I have to keep re-torquing theses bolts after every drive.
04-01-2009, 11:21 AM
#2
I just checked mine 2 nights ago and with only 300 miles on the build they were way backed off of 89 inch lbs. I used a paint pen this time so I can visually see if they start to back off. But I agree this is unnacceptable for a plastic intake that costs this much.
04-01-2009, 12:00 PM
#3
Sometimes when you tighten the one side the opposite side loosens up cuz it pulls it down more so I tighten the bolts snug, then snugger then to spec and run through every bolt at least twice with the torque wrench so I know any didnt loosen up when I tightened the other ones...
04-01-2009, 11:29 PM
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I just pulled my fast 92 a few weeks ago when starting my engine swap and had the exact problem you did. One of the rear bolts was so loose, I took it out with my fingers (no allen wrench). It had been on for just less than 3,000 miles.
I think you are correct with it being an issue with using the stainless hardware. I'm disappointed to hear loctite did not help - that's what I was going to try.
Also, it may be the gaskets "settling" as already mentioned, but definetly not the torque method. I installed mine per the instructions and went back and double checked that they were all at 89lbs still.
I'll try teflon tape when I get mine reinstalled and let you guys know how it turned out. It's a trick I've learned works pretty well for threads that are on their way out - maybe it will do the same for the stainless issue.
Anyone with the Fast 92 should check their bolts ASAP
I think you are correct with it being an issue with using the stainless hardware. I'm disappointed to hear loctite did not help - that's what I was going to try.
Also, it may be the gaskets "settling" as already mentioned, but definetly not the torque method. I installed mine per the instructions and went back and double checked that they were all at 89lbs still.
I'll try teflon tape when I get mine reinstalled and let you guys know how it turned out. It's a trick I've learned works pretty well for threads that are on their way out - maybe it will do the same for the stainless issue.
Anyone with the Fast 92 should check their bolts ASAP
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04-04-2009, 02:16 PM
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dont worry about the tq wrench on this...if you need a tq wrench on a 6mm bolt and a piece of plastic, maybe you should let someone else do it. Tighten em down until it feels right.
04-05-2009, 08:47 AM
#15
??? Manifold material "shrinking" with heat cycling??
Stainless bolts, alum heads, plastic intake... All have different expansion rates...A problem source??
Same thread specs on the bolts as in the heads? [Someone mentioned stock bolts= no problems.]
Does the intake use stock gaskets? If so, are the gasket grooves the same depth as factory intake? Too shallow and you are trying to maintain bolt loading on a "sponge".
Back to huggin' my stock intake!
Stainless bolts, alum heads, plastic intake... All have different expansion rates...A problem source??
Same thread specs on the bolts as in the heads? [Someone mentioned stock bolts= no problems.]
Does the intake use stock gaskets? If so, are the gasket grooves the same depth as factory intake? Too shallow and you are trying to maintain bolt loading on a "sponge".
Back to huggin' my stock intake!
04-05-2009, 06:34 PM
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Manifold material "shrinking" with heat cycling??
Stainless bolts, alum heads, plastic intake... All have different expansion rates...A problem source??
Same thread specs on the bolts as in the heads? [Someone mentioned stock bolts= no problems.]
Does the intake use stock gaskets? If so, are the gasket grooves the same depth as factory intake? Too shallow and you are trying to maintain bolt loading on a "sponge".
Back to huggin' my stock intake!
Stainless bolts, alum heads, plastic intake... All have different expansion rates...A problem source??
Same thread specs on the bolts as in the heads? [Someone mentioned stock bolts= no problems.]
Does the intake use stock gaskets? If so, are the gasket grooves the same depth as factory intake? Too shallow and you are trying to maintain bolt loading on a "sponge".
Back to huggin' my stock intake!
04-06-2009, 08:00 PM
#20
Why? It seems the "proper" way of doing it with the torque wrench is not very successful. I put my intake on with new FAST gaskets a year ago. I checked the bolts due to this thread and found all the bolts nice and tight. I did NOT use a torque wrench on the initial install. Either I got lucky or I know something you don't. I only use torque wrenches on critical fasteners, ones that see high load like head bolts, wheel studs, axle/differential components, etc.