that last shot confuses me.

 

I left the old one on during fab'ing. And that's fab with a b, not a p.

 

You may or may not be right, whats nice about it being a turnbuckle is that while its on the dyno I can and will turn the turnbuckle and find out just how far the manifold moves, if its more than a few millimetres I will do a very strong turnbuckle from under the turbo to the engine mount.

Dann

 

It's not about holding the turbo, it's about vibration.

 

Im not sure how that affects what I just said.

Dann

 

Josh, do you have an actual issue that you're trying to fix?

 

He is a miata enthusiast of course he does

Dann

 

A big problem I see with those mounts is that they rely on the actual bolt not bending...the tiny little head bolts. Uck.

 

If the welds dont bend the bolts cannot. They are loaded in single shear only if the welds bend.

Dann

 

If the welds dont bend the bolts cannot? What? Bolts are made to be loaded by tension.. not by a twisting motion

The way the link is connected the only force put on that mount is vertical at the end.. in other words by trying to bend the bolts.

 

Deleted post cos it was wrong and I didnt want to confuse people.

Dann

 

Dann

 

The green would be the force applied to the bracket.

Sure the bracket supports it self however remember you're talking about an M6 bolt there and a 10" long bar to put force on it. The 1/16-1/8" wall around it increases the tension until the opposite corners hit the bolt and at that point you're putting every bit of bending force on the bolt.

Say u're putting upwards force on it. The opposite corners that will contact the bolt will be the one where your arrow is pointing and the top on the right where the bolt head is at.

You can easily snap a m6 bolt just by over torquing it.. imagine how easy it is to snap it with a 10" bar .

To make things worse, theres a gasket those bolts hold. Every bit of upwards or downwards motion increases and loosens the force on that gasket.

 

It will be pulling outwards not down when it has the 3rd rod on it.

Dann

 

Also not a fan of the using the valve cover bolts. What about

 

Actually, if he uses a 3rd rod to triangulate it I was right.

Which Is what I was thinking before I read your post.

******* idiot I am.

Dann

 

How about


2 to go to turbo and 1 as a diagonal upward brace to a cross bar. Should give some upward strength and decrease vibration with three points of contact to big motor parts and some Mass of its own.

 

Cant we flip this over and make something from the ac compressor mounts? Its not like they're being used for anything on a proper car anyways.

 

Attach one large one to the motor mount on the bottom.

 

Lots to think about. I also thought of a much better way to fabricate the 2nd design, so I'll be making a 3rd prototype going to the VC bolts, 1/4" rod, 3rd member, etc. Gimmie some time though, I'm about to start a week of work and quizes in class.

Keep in mind they're only 5" long, not 10. We're really talking about tiny motions, I'm not too worried about it.