Tip turbine boost?

[Licensed to kill]

Going to add a boost gauge to my truck (1980 , 350 econodyne) Plan is to put a collar in the crossover pipe from the turbo to the top turbine but before I do that thought I would ask if there is provisions somewhere for that already that I don’t see. 

[MACKS]

I might be wrong but I don’t think your gonna see to much boost on a tip turbine,it basically just blows air thru the air box unrestricted unless it’s plugged up with dust,maybe that’s what your looking for,when to clean it out..

[JoeH]

Tip turbine doesn't make boost, it runs off of excess boost air though.  Use a port on your intake manifold for boost gauge line.

[Licensed to kill]

13 hours ago, JoeH said:

Use a port on your intake manifold for boost gauge line.

Yes, that is my question, is there a port somewhere already that I have not noticed or do I have to add one. It appears that the title of this thread has caused some confusion. I only mentioned the tip turbine because, of course, the entire intake system between the turbo and head is unique to this system and it is so where in that system that a port will be if one already exists.  

[Licensed to kill]

I have a port on the intake with some sort of gizmo coming off it. No idea what that gizmo is or is supposed to do????  Idea?

[mowerman]

hell,,,im no help...i never really knew,what they did...bob

[Brocky]

No Ideas on the gizmo!!!!! Does your air compressor feed from the intake manifold????  It looks like you could use either???

[Geoff Weeks]

Looks like a solenoid valve for an air fan clutch? no idea why that is there. There looks to be another port at the next intake runner as well. Has a 90 deg fitting that is cut off at the edge of the picture.  Any of them would be a place for a boost gauge. 

[Mark T]

That's the reversing relay for the puff limiter if I'm not mistaken. Any port that's already in the intake manifold will work. Not a good idea to have too much brass as it tends to crack. Looks like there's no puff limiter on it the way it is, use that port and remove the relay ???

[Geoff Weeks]

Not to up on that era Mack stuff, but I always liked the Tip-Turbine set-up. A better solution than Cummins low-flow cooling, for the same problem. How do you aftercool better than engine coolant can? How do you do it and fit the engine into current vehicles without re-designing the front end? Cat didn't try, Cummins tried to "super-cool" the coolant before it entered the engine, Mack decided to pull air from outside the hood, to pass through an air to air inside the hood.

[Licensed to kill]

I took that “gizmo” off and searched the part number and, yes, it is a puff limiter (whatever that is). I’ll pull the boost signal from that port. Thanks to all for the replies. 

[MACKS]

25 minutes ago, Licensed to kill said:

I took that “gizmo” off and searched the part number and, yes, it is a puff limiter (whatever that is). I’ll pull the boost signal from that port. Thanks to all for the replies. 

The puff limiter keeps the fuel restricted untill the engine gets boost,stops all that black smoke from to much fuel and not enough air..

[mrsmackpaul]

Also stops the diesel washing the oil fron the bores and extends engine life

It does make them less revy and slower to respond until boost developed, however the benefits out way the apparent increase in performance 

 

Paul 

[Mark T]

If the puff limiter works and is shimmed correctly, it should have minimal smoke and run about as good as it's gonna run.  That "gizmo"  would have got air when the parking brakes were released and then it would regulate the rack's travel according to manifold pressure.  Over fueling is never good. Looks cool when you're 23 or so..... then when you pay for it a couple times, not so cool.

[JoeH]

Correct on reversing relay for the puff limiter, which appears to be disabled. You can pull it off and use that port, be careful you don't break the fitting. You also have another port in the bottom right of the picture it appears.

[cruiseliner64]

The puff limiter is disabled on our Cruiseliner because its leaking air badly down at the injector pump.We are looking for one but no luck finding one yet.Can they be repaired? Or is it just a throw away part?

Paul

[JoeH]

We ran them deleted on our trucks for years. You'll be fine without it.

[Mark T]

24 minutes ago, JoeH said:

We ran them deleted on our trucks for years. You'll be fine without it.

If only I knew how to post that thing of that thumberg girl saying " how dare you "

[JoeH]

When they break and Mack doesn't sell the parts anymore what're you gonna do? 🥳🥳

[MACKS]

This thread makes no sense  to me is he talking about the tip turbine or the main engine turbo?

[Mark T]

I think he's trying to confirm the easiest place to get into the intake for a manifold pressure gauge. 

[BOBWhite]

The boosted intake air is what he is trying to measure, it just so happens to be a tip turbine engine. Although I wonder how much pressure is bled off from the turbo for the tip turbine system. 

In my head I've always thought the puff limiter was for drivers who didn't own the truck. When you pay the bills you are more conscious about what is coming out the stack and what's going past the rings into your crankcase. Wait until you feel the turbo come up then start adding fuel

[Geoff Weeks]

1 hour ago, BOBWhite said:

Wait until you feel the turbo come up then start adding fuel

If done well, there is no disadvantage to making automatic. Most Mfg did, some better than others.  I never had a problem with either Cummins (AFC) or Cats method. Earlier methods by all mfg needed some work.

 I wouldn't want to have to monitor the boost at all times to have a good running engine. 

 I can think of no advantage to not having the system take care of itself. All of them were adjustable if you knew how.

[Mark T]

If I remeber , Some of the extended range transmissions also had a signal from the transmission when you had it  in the lower gears so it wouldn't let it go into full fuel. Like when it was in low and reverse in a six speed. 

[Licensed to kill]

2 hours ago, MACKS said:

This thread makes no sense  to me is he talking about the tip turbine or the main engine turbo?

I apologize for the confusion. Yesterday I posted “It appears that the title of this thread has caused some confusion. I only mentioned the tip turbine because, of course, the entire intake system between the turbo and head is unique to this system and it is so where in that system that a port will be if one already exists.” To try to clear it up but let me say, this is not about the tip turbine it is about finding a good signal source for a boost gauge.