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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 02-21-2013, 04:13 PM   #61
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that last shot confuses me.
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Old 02-21-2013, 04:33 PM   #62
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I left the old one on during fab'ing. And that's fab with a b, not a p.
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Old 02-21-2013, 07:06 PM   #63
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Quote:
Originally Posted by Leafy View Post
Nitro, the one on your setup looks like it might do more harm than good. Its good to let the manifold move and if you try to lock it down in the wrong directions you end up actually putting more stress into it than if you just let it move around a bit as it heat cycles.
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.

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Old 02-21-2013, 07:13 PM   #64
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Quote:
Originally Posted by nitrodann View Post
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.

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It's not about holding the turbo, it's about vibration.
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Old 02-21-2013, 07:30 PM   #65
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Im not sure how that affects what I just said.

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Old 02-21-2013, 09:40 PM   #66
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Josh, do you have an actual issue that you're trying to fix?
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Old 02-21-2013, 09:47 PM   #67
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He is a miata enthusiast of course he does

Dann
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Old 02-21-2013, 10:07 PM   #68
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A big problem I see with those mounts is that they rely on the actual bolt not bending...the tiny little head bolts. Uck.

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Old 02-21-2013, 10:12 PM   #69
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If the welds dont bend the bolts cannot. They are loaded in single shear only if the welds bend.

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Old 02-21-2013, 10:18 PM   #70
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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.
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Old 02-21-2013, 10:23 PM   #71
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Deleted post cos it was wrong and I didnt want to confuse people.

Dann

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Old 02-21-2013, 10:26 PM   #72
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Dann
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Pictures of my rod for Hustler-untitled.png  

Last edited by nitrodann; 02-21-2013 at 11:06 PM.
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Old 02-21-2013, 10:42 PM   #73
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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.
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Old 02-21-2013, 10:50 PM   #74
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It will be pulling outwards not down when it has the 3rd rod on it.

Dann

Last edited by nitrodann; 02-21-2013 at 11:06 PM.
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Old 02-21-2013, 11:01 PM   #75
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Also not a fan of the using the valve cover bolts. What about
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Old 02-21-2013, 11:04 PM   #76
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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
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Old 02-21-2013, 11:48 PM   #77
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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.
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Old 02-22-2013, 12:47 AM   #78
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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.
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Old 02-22-2013, 01:00 AM   #79
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Attach one large one to the motor mount on the bottom.
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Old 02-22-2013, 01:47 AM   #80
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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.
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