Flow concerns regarding intake Plenums

[Big Bore]

I machined the lip on ******s

What did you use to machine the lip?

I machined receiver grooves in the flange to allow the I-Gray to form a mechanical lock between bolts too.

Interesting idea. Did you machine straight through the bolt holes? How wide is the groove? End mill?

 

[Viking]

What did you use to machine the lip?

 

[OSCS]

Has anyone seen a "intake manifold" custom made for the 7.3? I saw a guy making one on PSN awhile back but he was only running three runners per bank.

 

[Hotrodtractor]

Has anyone seen a "intake manifold" custom made for the 7.3? I saw a guy making one on PSN awhile back but he was only running three runners per bank.

Yes. There are a few different designs out there on trucks - but most of them involve removing the oil rails.

 

[Big Bore]

Yes. There are a few different designs out there on trucks - but most of them involve removing the oil rails.

Someone posted pics here sometime back of some big tube plenums, but the search engine sucks and I can't find it.

 

[Charles]

Also, if I read it right, and someone actually asserted that plenum volume does not effect power output.... you are HIGH.

 

[Viking]

Someone posted pics here sometime back of some big tube plenums, but the search engine sucks and I can't find it.

This?

http://powerstrokearmy.com/forums/showthread.php?t=6860

 

[imelmo]

I just cleaned a bunch of crap out of this thread. This is a tech section, not AWOL. Next person to muck up this thread will get some time off.

.

 

[Big Bore]

This?

http://powerstrokearmy.com/forums/showthread.php?t=6860

No lol, but very similar. That dude is awesome.

 

[Hotrodtractor]

ZZ Fab pieces.

Triple Runner Stroked Out Manifold

Larger plenum design from WOE:

There are more designs out there, but here are just a hand full of stuff that is public knowledge on 7.3 PSDs.

 

[OSCS]

I just cleaned a bunch of crap out of this thread. This is a tech section, not AWOL. Next person to muck up this thread will get some time off.

.

That's great news

 

[OSCS]

ZZ Fab pieces.

Triple Runner Stroked Out Manifold

Larger plenum design from WOE:

There are more designs out there, but here are just a hand full of stuff that is public knowledge on 7.3 PSDs.

Thats awesome! It's unreal what people come up with

 

[OSCS]

Plexy glass valve covers? That's awesome

 

[Charles]

To put things in perspective, experienced, professional engine builders agree that the intake plenum volume should be 1.5 to 2 times that of the engine displacement.

For a 444 cubic inch engine, the low end for plenum volume would be 666 cubic inches at 1.5 times the engine displacement.

If you made the plenum out of tube with a section width of 6 inches, it would need to be ~2 feet long in order to meet this requirement. That means a 6" diameter tube from the front to the back of the engine.

That should sufficiently put things in perspective.

 

[Worstenemy453]

To put things in perspective, experienced, professional engine builders agree that the intake plenum volume should be 1.5 to 2 times that of the engine displacement.

For a 444 cubic inch engine, the low end for plenum volume would be 666 cubic inches at 1.5 times the engine displacement.

If you made the plenum out of tube with a section width of 6 inches, it would need to be ~2 feet long in order to meet this requirement. That means a 6" diameter tube from the front to the back of the engine.

That should sufficiently put things in perspective.

Now, i know ive said that it doesnt matter how much air for turbo or NA because thats how i feel but would a turbo change that calculation at all ?

That would be a big ass manifold LOL

 

[Hotrodtractor]

Now, i know ive said that it doesnt matter how much air for turbo or NA because thats how i feel but would a turbo change that calculation at all ?

That would be a big ass manifold LOL

A turbo just makes the air more dense - it does not effect the volumetric flow rate through the engine, just the mass flow.

 

[OSCS]

A turbo just makes the air more dense - it does not effect the volumetric flow rate through the engine, just the mass flow.[/QUOTE

I always figured a turbo just forced more air in the motor, making it work harder an faster..IE forced induction. I'm able to understand the dynamics much more now that I know it simply makes the air more dense. Great info on this thread I've learned alot.

 

[Charles]

Now, i know ive said that it doesnt matter how much air for turbo or NA because thats how i feel but would a turbo change that calculation at all ?

That would be a big ass manifold LOL

Look at load-cell proven manifolds hanging off the side of 5.9L cummins heads and then decide for yourself if the plenum to engine displacement figure I gave seems unrealistic.


Not the best picture size, but here is pretty much the pinnacle of 3.0 engines at a listed 1350hp, born out of sweat and tears on the engine dyno, where the only things on the engine are the things that WORKED.

I know the picture size is small, but look at that plenum volume. Compare it to that injection pump for scale.

That's on a 5.9..... well, ~6.4 or so.


Now does a 6" x 24" seem crazy for a 7.3L engine in comparison?

 

[Worstenemy453]

Im not saying youre wrong or anything, as i know you are right as far as calculations and all. Im just saying it would be a big ass manifold LOL