1993 6.9 IDI Compound Turbo ZF5 Manual Bricknose Bronco Build

[hce]

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.

Having experienced higher boost numbers with stock head bolts and studs on a 6.9 and no ill effects on head gaskets, I am curious where these numbers come from and why they are constantly regurgitated like gospel?

 

[Ace Perkes]

Having experienced higher boost numbers with stock head bolts and studs on a 6.9 and no ill effects on head gaskets, I am curious where these numbers come from and why they are constantly regurgitated like gospel?

I agree because I too have read 10 -15 psi max. I know redline is best to leave stock not to push your luck there. I may try 20lbs eventually.

 

[pastorjeep]

Love this project. Actually love any build like this where you are doing what you dream of doing. Can't wait to see the build come together.

 

[Ace Perkes]

Sound deadening 5 rolls in. About 40% done I think. Hoping this will eliminate a lot of road noise.

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[Ace Perkes]

Also, cleaning up the motor and radiator support. My new puppy Stella (3 mo.) fell asleep in my shift boot.

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[Ace Perkes]

Also, found these on the F250. I wonder if the Broncos ever had them from the factory?

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[Ace Perkes]

Cleaned/degreased the front carpet in preparation for painting it black (along with all other interior trim) with the vinyl and carpet paint I have seen it done on YouTube

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[03wr250f]

@hce

There is no exact boost number that lifts heads its cylinder pressure.
The harder you push(more boost) the more you build cylinder pressure.
Fueling, rpm, back pressure, heat all play into cylinder pressure
As a general rule 10-15psi is "safe"
I have a buddy running 20psi regularly and has seen 24psi on head studs that were torqued to yeild(he did all the calculations on them and found his most clamping force)
Anyway his is still running great
I have heard of some people making 25+ psi on 6.9 studs and others lifting at 15 psi.

I can tell you a 110cc pump will lift heads. I can think of 3 studded 6.9s that have lifted above 20psi.

It's all a educated guess

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[Ace Perkes]

So my tailgate torsion bar mount has rusted out. Anybody know the best way to fix this?

 

[Ace Perkes]

Also, I need to find the correct orfice to properly convert to 134a. Any help is much appreciated.

 

[Ace Perkes]

Brick-nose fenders installed!!!

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[Ace Perkes]

6” lift ordered [emoji736]
35” tires ordered [emoji736]
Waste motor oil drum heater ordered [emoji736]
Waste motor oil centrifuge ordered [emoji736]
ARP studs ordered [emoji736]

Stay tuned for installation/progress updates!

 

[hce]

6” lift ordered [emoji736]
35” tires ordered [emoji736]
Waste motor oil drum heater ordered [emoji736]
Waste motor oil centrifuge ordered [emoji736]
ARP studs ordered [emoji736]

Stay tuned for installation/progress updates!

 

[Ace Perkes]

Okay, so tires and lift have arrived. Centrifuge has arrived and oil refinery is almost finished!

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[IDIBRONCO]

I'll bet your wife was happy about that tire inside the house.