Grade 8 or Torque-to-yield for intake manifold and plenum?
Champion
Joined: Sep 2011
Posts: 3,891
Likes: 8
From: NorCal
This is an awesome description of bolt tightening theory: http://www.enginebuildermag.com/Arti...uetoangle.aspx
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.
I would suspect that everything is by default coated in 30W or similar to explain why its not stated.
Legend
Joined: May 2005
Posts: 8,663
Likes: 8
From: Central Oklahoma
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.
Problem solved.
Champion
Joined: Sep 2011
Posts: 3,891
Likes: 8
From: NorCal
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.
I'm not saying its a good or bad idea, just saying that adding a joint like that is not trivial.
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.
I'm not saying its a good or bad idea, just saying that adding a joint like that is not trivial.
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; Oct 27, 2011 at 03:10 PM.
