Greetings everyone. In looking at the air horn (single big tube) and then air intake plenum cover, reading on this forum that some of the outer cylinders which are further away from the air horn can receive less air, wondering why more balanced air manifold/plenum designs have not worked out?

For example, in the XJ jaguar in-line 6 fuel injected engines from the 70's and 80's, there is a big intake plenum and then 6 tubes from this, one to each cylinder. Hi performance people have modified to extend the tubes up into the intake plenum, add flared ends, and tune the length like an organ pipe so more air is pushed into each cylinder at the desired RPM (high pressure node at the valve). I am told this makes a very noticable difference, especially if you are able to add a cam with a longer duration and higher lift on the intake side.

A bigger air plenum/air tube assymbly will take longer to come to a given boost pressure because of the bigger volume, but I am not sure this would be that noticable for all but racers as the whole air intake side after the turbo has a pretty big volume already. For people who do not care as much about small differences in throttle response but rather power at best mpg and lower EGT, this seems like a worthwhile trade-off.

What am I missing?

What is the cylinder firing order of the 5.9? Maybe I will make one.

Many thanks.

 

The problem is milling the head. If you look up Banks (Gasp! I said the B word!) big hoss intake, it shows the work that goes into milling the head to give all the intakes the same air...

http://www.bankspower.com/products/show/260/6

There was a thread on CompD or cummins forum about removing a couple of freeze plugs and installing some pipes off the main intake to provide more air to the 1 and 6 cylinder... I think it was titled 'spool aid'...

I also believe I've seen some talk of using the 6.7 intake setup since it's bigger...

hth...

 

And... the firing order is 1 5 3 6 2 4... Number 1 is at the front.

I should know that off the top of my head, but I had to go look it up... I'm slipping... too much Marine Corps...

 

Look at # 1 and # 6 there are freeze plugs in those
spots, 1 1/2" dia. Pop those out install 1 1/2" Dom tube
4" long. Buy 8 clamps and 4 ply hose. I went to Midas
and had two pipes 1 1/2" bent to go from dom in head to
intercooler tube. Need short pipe welded into boost tube.
Connect with hose and clamps. Now you have air across
intake.

 

It's on compD... search for spool aid in the title...

 

Blueboy, thank you. Would it be possible for you to post a photo of this setup?

 

The whole reason for cutting off the intake plenum is so you can do a proper port & pollish job on the inake side. Without it you can only do the exhaust side. Spoolaid, no thanks. It's just a bandaid because you still haven't improved the flow of the intake runners and valve area. Save your money. Many high HP trucks running with the factory intake plenum.

 

Pm your email and I will send pics.

 

He can build a spool-Aid cheap.
How many thousands of dollars
does it cost PP, buy intake, machine head.

 

You can buy a spool-aide for 350...

Make it yourself and it's a cheap mod. Honestly how many people here really need a PP head?

 

That spool aid is just plain B.A.!! Kudos to the guy who thought of that! I wonder if 12v motors have provisions for something similar. Hmmmm....

 

Anyone wanting to make there own, you can buy 1' of
Dom tubing on ebay, it has hole already. Cut 2 4" pcs.
The 1 1/2" pipe any auto parts store, I used pvc to
mock up length and bend, took to midas and had them
bend and flair ends. No charge. Clamps and 4 ply
hose I bought on line. This can be made for a little
less then $100.

Somebody at Scheids made the first ones.

 

have been thinking about this quite a bit. It would seem to me this would be most effective at low boost pressure and relatively high RPM. Just thinking about how difficult to change the momentum of the air flow--easier at higher boost. Yet the dyno and track measurements do not get to this. Does anyone who has one of these kits have any seat of the pants feeling for performance at boost less than 15psi and rpms in the 1600 to 2300 range? Many thanks.

 

someone post some pics....