that trans looks really clean and healthy,no snurge stuck to the base of the cases and just small bits of 'shift swarf'on the magnetic drain plug-it feels so good to open things up and find someone took the time to care for it properly.
those gears look like something out of one of our 3 speed auto drag bikes-hench!

 

Awesome truck! What are you planning on doing with the back half? Flat bed? And what rear are you running?

 

GM 14 Bolt FF..... currently a 4:10... will EVENTUALLY swap to a 3.73 or a 3.43 pending on how I feel about the 10 speed eaton fuller transmission after I get a few miles on it...... but that will be way down the road.......

 

Goodies.......

Big... and by big I mean BIG brand new flywheel (Cheap too!).... I'm sure I can find a big enough clutch now! (muahahahaha)





COBRAHEAD!!!!! Off of a 8.3L Cummins 6CT..... (had for under a hundo too......truck salvage yards rock)





I still have to make a 3/4" double V band from 4-3/8" to 4" adapter... but that is just some hot rolled steel at work and some lathe time.....

Badda Bing!

~M

 

Lookin good! Wonder how much restriction that cobra head has... understood you can't really fit much else in there though.

 

No different then a normal 90* elbow.....

Not to easy to explain, but under laminar flow conditions... as long as the overall cross sectional area remains unchanged you don't loose much......

(I know alot of people will dissagree with me, but..... well there's a reason I have a degree in mechanical and jet turbine engineering........)

 

Yeah, fluid dynamics. Only reason asking is I thought it looked like it lost a little bit of volume in there. Must be the pic deceiving me.

 

The area lost in the 'vertical height' is gained in the horizontal height... why the width of the cobrahead pipe at its widest point is almost 6 inches.....


That being said... (since you seem to be familiar with fluid dynamics) the turbo's sprial or turbulent flow at exit is fairly high in its exiting of the exhaust turbine......... and hence HERE is where the loss is.......the 'frictional' loss so to speak of that swirling effect getting slowed down going through the 'wide neck' of the cobrahead instead of a uniform normal mandrel bent tube which allows this swirl to progress through the normal 90* bend radius...... this is NOT the case in the cobrahead.....

This flow loss...while not necessary negligble.... is nothing worth sacraficing for the space gained...let alone such a small % that under a non-highhorsepower setting (500hp+) is totally unnoticeable in performance or consequent EGT etc.

Wow.... thats probably the most 'book stuff' I've puked out in a post in awhile...

Time for a beer?

 

If I read that correctly, you're saying most of the restriction happens in the turbo, promptly after the turbine wheel, right?

And yes, why not! Been a long day of working on my project too, haha.

 

The air flow exiting the turbo is spiraling much like a tornado......

When it gets to the neck of the cobrahead....(aka the wide part....)

It can no longer have a nice perfect spiral flow anymore because the cross sectional shape of the pipe is changing as you go through the bend...

IGNORE the text on the picture but the flow diagram is correct....