1993 6.9 IDI Compound Turbo ZF5 Manual Bricknose Bronco Build

[chillman88]

This is solid advice. If you are really planning on compound turbos and high boost, and you are going to go through your 6.9, you should have the machine work done to the block to accept the larger studs that the 7.3 came with.

Has anyone ever successfully done that? I know you can't just drill and tap (something about the 7/16 Major diameter being larger than the minor diameter of the larger studs) so I'm assuming that would require either helicoils or threaded inserts.

 

[lotzagoodstuff]

I believe R&D put the larger studs in a 6.9, it's definitely an involved process requiring machining not just drilling and tapping. Perhaps somebody else with the history will chime in.

 

[lotzagoodstuff]

Looks like I was incorrect, you cannot put the larger 7.3 studs in a 6.9, see link below:

https://www.oilburners.net/threads/6-9-head-stud-upgrade-possibility.73834/

 

[03wr250f]

Correct you cannot put 1/2 studs in a 6.9 there is not enough meat.
There has been talk about going to 9/16 studs but no one has yet successfully done that.
A studded 6.9 is limited to 15 psi boost safely 20psi if you want to risk it.

Why compounds over a used turbo kit that can be picked up for less than a grand?

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[Ace Perkes]

I'm glad to see that you're planning to install head studs. They will help, for sure. I believe that the general rule of thumb is about 15 PSI max boost for a studded 6.9. You could possibly run up to 20 PSI, but I won't guarantee that. The 6.9's 7/16" head bolts/studs don't hold as well as the 7.3's 1/2" ones do. When you run too much boost for too long, you'll usually end up lifting a head and then there goes your head gasket.

Yeah, I agree with everything you said that’s what I was planning to play with for awhile. Then add a R&D camshaft, injection pump, etc. as much as my wallet can allow. And go that direction to add horsepower, not more boost just to keep it reliable.

 

[IDIBRONCO]

Yeah, I agree with everything you said that’s what I was planning to play with for awhile. Then add a R&D camshaft, injection pump, etc. as much as my wallet can allow. And go that direction to add horsepower, not more boost just to keep it reliable.

Good. I was hoping that you weren't one of the people who just want to get as much boost as possible out of an engine. Since I have no idea what those turbos you mentioned are or what they do boostwise, I was trying to caution you.

 

[IDIBRONCO]

I believe R&D put the larger studs in a 6.9, it's definitely an involved process requiring machining not just drilling and tapping. Perhaps somebody else with the history will chime in.

If anybody has done this, it would be Justin. Generally, it can't be done. Of course if you did, you would have to enlarge the head bolt holes in your heads or find some 7.3 heads.

 

[Ace Perkes]

So here’s what I got done today.

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[Ace Perkes]

If anybody has done this, it would be Justin. Generally, it can't be done. Of course if you did, you would have to enlarge the head bolt holes in your heads or find some 7.3 heads.

I will have to ask my uncle if he can do that at the machine shop he manages. It is an oilfield machine shop though.

 

[Ace Perkes]

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So close, but so so far away.

(motor on tire in the background)

 

[Ace Perkes]

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[Ace Perkes]

I will have to ask my uncle if he can do that at the machine shop he manages. It is an oilfield machine shop though.

Never mind I read the other messages... I’m tired.

 

[Ace Perkes]

Good. I was hoping that you weren't one of the people who just want to get as much boost as possible out of an engine. Since I have no idea what those turbos you mentioned are or what they do boostwise, I was trying to caution you.

They are off of the 6.5 90s Chevy diesels.


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[Ace Perkes]

Correct you cannot put 1/2 studs in a 6.9 there is not enough meat.
There has been talk about going to 9/16 studs but no one has yet successfully done that.
A studded 6.9 is limited to 15 psi boost safely 20psi if you want to risk it.

Why compounds over a used turbo kit that can be picked up for less than a grand?

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The turbos were free. So I figured I didn’t need a lot of boost so why not just have them compound to spool quickly.


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[Ace Perkes]

Looks like I was incorrect, you cannot put the larger 7.3 studs in a 6.9, see link below:

https://www.oilburners.net/threads/6-9-head-stud-upgrade-possibility.73834/

Good thought though.


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