AMC Eagle Den Forum

The Mighty 258 => The Engine => Topic started by: MudPuppy on January 02, 2012, 03:48:57 PM

Title: Same engines, big difference?
Post by: MudPuppy on January 02, 2012, 03:48:57 PM
I noticed that there is a difference in these 2 engines. The '81 is AWD and the 82 is select. But that still shouldn't make this much of a difference, I wouldn't think.
Why does it look like the '81's bay is stuffed and the '82's has so much extra room?


(http://i176.photobucket.com/albums/w169/chantel5/Eagle/82-engine-1.jpg)
'82 select


'81 AWD
(http://i176.photobucket.com/albums/w169/chantel5/Eagle/100_0125.jpg)

And here is the '87's, it's pretty stuffed in there as well.
(http://i176.photobucket.com/albums/w169/chantel5/Eagle/100_0007-2.jpg)

Title: Re: Same engines, big difference?
Post by: Budwisr on January 02, 2012, 03:57:24 PM
 Well the 81 has the big ol' York AC compressor and also has an air pump for the emissions while the 83 has the smaller Saden compressor and no air pump (pulse system after 81). Also looks like the 83 has had some of the stock emission lines/controls removed, but then again so has the 81.
Title: Re: Same engines, big difference?
Post by: Hawk258 on January 02, 2012, 04:03:08 PM
Buds right, you will notice the lack of fuel canister and vacuum lines going to the sides, and it also looks like alot of the wiring is better hidden or ran or missing too, but everything else should be nearly identical.
Title: Re: Same engines, big difference?
Post by: ammachine390 on January 02, 2012, 04:10:16 PM
It looks like a lot of the emission controls on the 82 have been removed. It should have an air pump, as pulse air wasn't introduced til 83. Its also missing the fuel vapor canister as Hawk258 stated, but its also missing the 3 solenoids on the valve cover, and its missing the water valve for the air conditioner as well.
Title: Re: Same engines, big difference?
Post by: IowaEagle on January 02, 2012, 04:16:49 PM
Yes the heater shut off valve is missing.  The A/C will not work at peak efficiency without it.
Title: Re: Same engines, big difference?
Post by: MudPuppy on January 02, 2012, 04:24:53 PM
Man, y'all must have some good eyes  :rotfl:
What all is needed back on the '82 for it to run properly?  No, emissions or inspections here.
Would like heat to work of course, AC would be nice but isn't really needed.
3 solenoids on the valve cover  ??? ? I am lost there.

The '82 will be the one I am going to get back on the road. The '81 is for parts (poor rusty car   :'().
Title: Re: Same engines, big difference?
Post by: IowaEagle on January 02, 2012, 04:45:26 PM
The three solenoids were part of the emission system and were bolted to the top of the valve cover.  You can see the mount for them on the '81 at the back of the cover.  Looks like all three engines have had at least partial smogectomies.  The '82 appears to have the standard motorcraft distributor cap.  A MIU upgrade or an HEI upgrade will be a good improvement.
Title: Re: Same engines, big difference?
Post by: Budwisr on January 02, 2012, 09:11:33 PM
Quote from: ammachine390 on January 02, 2012, 04:10:16 PM
It looks like a lot of the emission controls on the 82 have been removed. It should have an air pump, as pulse air wasn't introduced til 83. .
Yep, my bad. '82 model should have the air pump. The pulse system was introduced in 1982 for the 83 models. Whoops.
Title: Re: Same engines, big difference?
Post by: shanebo on January 02, 2012, 10:32:23 PM
I think the paint job has somthing to do with it too. The black one is the same color as the engine and all the hoses making it kinda blend all together looking like theres alot more engine...theres alot of black goin on there. The gold one allows the eyes to more easily distinguish engine from the body.....Not to metion what everyone else said about a few more hoses and a bigger A/C.
Title: Re: Same engines, big difference?
Post by: 83Eagle! on January 03, 2012, 01:27:04 AM
Is "smogectomies" in the dictionary?  If not, it should be.  It seems to be a common occurence with these engines.  I was introduced to the concept by Allend at the '08 meet at IowaEagle's.
Title: Re: Same engines, big difference?
Post by: IowaEagle on January 03, 2012, 06:13:59 AM
Quote from: 83Eagle! on January 03, 2012, 01:27:04 AM
Is "smogectomies" in the dictionary?  If not, it should be.  It seems to be a common occurence with these engines.  I was introduced to the concept by Allend at the '08 meet at IowaEagle's.

Funny you mentioned that.  I added it to my computer dictionary yesterday,
Title: Re: Same engines, big difference?
Post by: MudPuppy on January 03, 2012, 05:11:28 PM
So the '82 isn't missing anything that is needed? From what you can tell by the pics?
Seems that the '81 and '87 might have more hoses, to me at least.
Which AC of the 2 is the better one?
Title: Re: Same engines, big difference?
Post by: ammachine390 on January 03, 2012, 05:57:29 PM
Well, the fuel vapor canister isn't really necessary, but it does keep your car from smelling like gas. Also, your 82, is missing the vacuum reservoir for the heater water valve. Both should be located on the driver's side fender and can be seen in the 81 pic. As far as the air conditioners, I think either are ok, the nice thing about the 81 is that the York compressor does not need oil mixed with the refrigerant as the oil is separate. Some people use them as air compressors.
Title: Re: Same engines, big difference?
Post by: MudPuppy on January 03, 2012, 06:23:45 PM
Ah, (fuel vapor canister) that's the black thing on the driver side shock tower I take it? My TSM shows an upright can-type thing.
And what does the vacuum reservoir (for the heater control valve) look like? I can't seem to locate this in my TSM.
Are the vacuum motors on the breather neck crucial?
I would love to have an on-board air compressor, that might be worth not having an AC.
Is there somewhere that shows how to turn one into an air compressor?
Title: Re: Same engines, big difference?
Post by: ammachine390 on January 03, 2012, 06:54:19 PM
(http://i815.photobucket.com/albums/zz79/ammachine390/amcpic9.png)

A is the fuel vapor cannister.
B is the vacuum reservoir for the water valve.

What vacuum motors are you talking about on the breather neck?

For the compressor, just google onboard air york compressor.
Title: Re: Same engines, big difference?
Post by: BenM on January 04, 2012, 02:25:03 PM
Quote from: MudPuppy on January 03, 2012, 06:23:45 PM
And what does the vacuum reservoir (for the heater control valve) look like? I can't seem to locate this in my TSM.
Are the vacuum motors on the breather neck crucial?

The vacuum reservoir is either a black tin can or a plastic ball like the 81, they seemed to use them interchangeably.

One vacuum motor on the air cleaner brings heated air from the exhaust and the car may run just fine without it, although your carb may ice up on cold, humid days; I've had it happen in other cars.

The other vacuum motor just needs a delay valve and a line to any manifold vacuum source. It closes the filter off so that gas vapors go into the canister and don't evaporate and make the front of the car smell like gasoline on hot days. Without it hooked up you have very little air flow to the engine. The delay valve, sometimes with a small reservoir or in a pinch just a check valve will do, keeps the door from slamming shut when you're accelerating hard and is absolutely necessary.
Title: Re: Same engines, big difference?
Post by: carnuck on January 06, 2012, 01:35:05 PM
Here is the underside of the hood on my '81 Wagon
(http://i6.photobucket.com/albums/y209/carnuck/AMC%20Eagle/photo5.jpg)

On the left side of the pic (passenger's side) behind the York compressor is the air suspension/on board air pump. I finally dug enough stuff out of the way to get a pic (and start the trans swap) On the right side of pic (driver's side) you'll see the AIR system compressor people have been telling me don't exist in Eagles.
Title: Re: Same engines, big difference?
Post by: rollguy on January 06, 2012, 06:47:37 PM
Quote from: carnuck on January 06, 2012, 01:35:05 PM
On the right side of pic (driver's side) you'll see the AIR system compressor people have been telling me don't exist in Eagles.

Here in Cali all the Eagles have an A.I.R. (Air Injection Reactor) pump.  The pulse air system must have replaced the A.I.R. system, as I have not seen both on the same engine.