Grade 8 or Torque-to-yield for intake manifold and plenum?

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#21

10-27-2011, 01:13 AM

Wh1t3NuKle

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Quote:

Originally Posted by grox

This is an awesome description of bolt tightening theory: http://www.enginebuildermag.com/Arti...uetoangle.aspx

Quote:

Originally Posted by grox

Is a thread locker recommended with the factory bolts?

The article you linked addresses that...

Quote:

Unless specified otherwise, 30W motor oil is the standard lubricant for automotive fasteners. If we want to achieve loads similar to the OEMs. we need to lubricate our fasteners with 30W oil. Don’t forget that underhead and thread friction both need to be controlled, so lubricate both areas. In the case of head bolts going into the water jacket, the sealer on the threads will provide the lubrication needed, so just apply oil to the underside of the head of the bolt. Super lubricants may actually get you in trouble by relieving too much friction, leading to over-tightening.

btw...its a great article. Good find!

Quote:

Originally Posted by HeyYou

I didn't use any, and the various manuals didn't call for it either.

I would suspect that everything is by default coated in 30W or similar to explain why its not stated.

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#22

10-27-2011, 08:48 AM

Gary-L

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Honestly, unless future plans entail removing and dismantling the plenum on a regular basis, I would find someone who can weld aluminum and have the bottom plate welded in place.

Problem solved.

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#23

10-27-2011, 12:57 PM

Wh1t3NuKle

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They better well know how to TIG weld. Size the fillet weld for the thickness of the plate in addition to the proper heat input of that thin plate to the CAST manifold. Oh...and therefore, no need for the gasket.

I'm not saying its a good or bad idea, just saying that adding a joint like that is not trivial.

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#24

10-27-2011, 02:02 PM

aim4squirrels

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Just JB weld it and be done.

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#25

10-27-2011, 03:06 PM

John D in CT

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Quote:

Originally Posted by Wh1t3NuKle

I'm not saying its a good or bad idea, just saying that adding a joint like that is not trivial.

No, not trivial, but I think it's totally doable for any competent welder of aluminum. I've done a little research and welding cast to plate doesn't seem like much of a problem, and I don't think the operating temperatures involved present much of a problem with the two types of aluminum expanding very much. The biggest challenge I see is making sure the intake is very free of oil that could cause porosity in the weld. Might have to be burned off a bit with a torch first.

Looks like it could be welded with TIG, MIG, or even stick, but TIG is probably the most common. And 1/4" isn't all that thin; that's plenty to work with.

http://bbs.homeshopmachinist.net/arc...p/t-33887.html

http://www.shopfloortalk.com/forums/...hp?t-1596.html

http://www.keytometals.com/Article12.htm

Last edited by John D in CT; 10-27-2011 at 03:10 PM.

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