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Old 10-31-2012, 12:39 PM   #31
Re: what is A Vaccum ejector?  
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Thanks a bunch Tony. I'm going to have to send the entire air box as the vacuum fitting going into the box acts like a restrictor!

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Old 11-02-2012, 12:22 AM   #32
Re: what is A Vaccum ejector?  
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Just a side note, contrary to the parts manual, the vacuum ejector is used on the 91 as well.

Here are some pictures:

Vacuum Ejector Harness



Vacuum Ejector removed showing correct placement



Vacuum Ejector view 2



And just FYI, you cannot measure a vacuum ejector because, well, its a vacuum ejector. Here is a link to what the inside of the vacuum ejector looks like. Thats exactly what my vacuum ejector looks like when you look through it, sorta like an hour glass.

Additionally, it does work. If you blow through the white side of the ejector, it creates vacuum at the tee part. Its magic!!!
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Old 11-06-2012, 12:57 PM   #33
Re: what is A Vaccum ejector?  
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So placing an orifice laced on and end of a standard tee would not work? Is the hour class design actually needed to create vacuum?

I assume the center barb on the ejector TEE goes to the turbo?

Would you PLEASE add this information to the orifice thread located here;

http://www.turbododge.com/forums/f4/...-database.html

Thanks for the info!
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Old 11-06-2012, 01:11 PM   #34
Re: what is A Vaccum ejector?  
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The hour glass design is needed to create vacuum, no orifice will suffice in this case.

The center barb of the ejector tee goes to the cruise control as it's main purpose is to provide vacuum while under boost.
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Old 11-06-2012, 01:17 PM   #35
Re: what is A Vaccum ejector?  
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where does the turbo charger hook up at??
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Old 11-06-2012, 01:28 PM   #36
Re: what is A Vaccum ejector?  
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This illustration might explain it better:

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Old 11-06-2012, 04:08 PM   #37
Re: what is A Vaccum ejector?  
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The hourglass you see is actually a nozzle. It starts out as a convergent nozzle then a divergent nozzle, this process causes the incoming fluid(air) to gain speed. To be easy without the technicals, the pressure of the incoming air drops twice, velocity increases twice as it goes through the nozzle thus creating the vacuum on the bottom connection on the tee. The reasoning behind te triangle mayb in part to maintain fluid movement. the air drawn into the air ejector has to build pressure to keep the flow going, normally by slowing down the outgoing air. I have worked with these plenty of times before, same exact concept as those air driven vacuum pumps you can get for drawing a vacuum on your air conditioner system. As for the chrysler engineers sniffing glue, well i have been building testing rigs for various equipment. The rule is just make something work, cheap and easy doesnt have to be pretty, just work
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Old 11-17-2012, 12:07 AM   #38
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Maybe they should have stayed with the earlier and less complex method to create vacuum under boost for the cruise control and brake system.

Dennis
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Old 11-17-2012, 10:54 AM   #39
Re: what is A Vaccum ejector?  
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The question is, does it really create vacuum under boost? I know for a fact that my vacuum ejector creates vacuum under boost. The old system I wouldn't be too sure if it created vacuum under boost at all.
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Old 11-18-2012, 08:54 AM   #40
Re: what is A Vaccum ejector?  
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I think this is all a moot point...
How fast do you have to be traveling at no load cruise to actually be in boost and if you are traveling that fast do you really need your cruise control???
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Old 11-18-2012, 06:01 PM   #41
Re: what is A Vaccum ejector?  
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Very good point NAJ. Going uphill a long grade with the Mitsubishi turbo will send it into boost very easily. Perhaps that was what the Chrysler engineers were thinking when they used it.
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Old 11-19-2012, 07:55 AM   #42
Re: what is A Vaccum ejector?  
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Quote:
Originally Posted by bamman View Post
Very good point NAJ. Going uphill a long grade with the Mitsubishi turbo will send it into boost very easily. Perhaps that was what the Chrysler engineers were thinking when they used it.
That could very well be true although cruise was designed to be used on long, straight, flat roads.
I looked at my boost gauge yesterday while i was driving at 65 and while the cruise was on at 65.
When I am in control of the throttle vacuum was at 15" HG, with the cruise on engine vacuum was slightly lower.
Naturally if I encountered a hill or hit the accel button I would probably be close to boost with my VNT but my VNT does not use a vacuum ejector...???
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Old 11-20-2012, 12:35 AM   #43
Re: what is A Vaccum ejector?  
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Quote:
Originally Posted by NAJ View Post
I think this is all a moot point...
How fast do you have to be traveling at no load cruise to actually be in boost and if you are traveling that fast do you really need your cruise control???
How about the secondary feed to the brake booster?
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Old 11-20-2012, 06:25 AM   #44
Re: what is A Vaccum ejector?  
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Brake booster stores vacuum, that is the reason for the one way check valve, you always have 2-3 power assisted pedal pumps.
Also, as soon as you release the throttle you are back in vacuum so braking will not be affected.
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Old 11-20-2012, 08:18 AM   #45
Re: what is A Vaccum ejector?  
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Very interesting thread. I just found this by coincidence when googling for an explanation of a vacuum ejector for something at work, lol ^^
I do remember removing that so-called "triangle of death" when i put a vacuum block in and redid my vac lines/routing. my cruise hasn't worked before that tho and i very rarely drive it on highways anyway. in fact i've been driving it very rarely at all for the past 2 years

anyways:
Quote:
Originally Posted by NAJ View Post
That could very well be true although cruise was designed to be used on long, straight, flat roads.
Anyone else want's to comment on that? When i use cruise control on any car i don't do much of a differentiation between going up hills or whatever terrain, safe for driving situations where i think it would be unsafe to take it on at the set speed. It's even more convenient when you have a turbo'd or big CID engine so there's still sufficient power for acceleration. So in this case i kinda disagree on that point NAJ.
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1989 2.5l t-1, 1991 2.5l t-1, vacuum ejector, vacuum reservoir

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