Installed the dual snorkel air cleaner assembly with a couple of minor headaches. The most obvious is the straight A/C line running on top of the passenger side hose. I had to bend that hose into an oval shape to get it to just barely fit with the hood closed.

Only think I'm not sure of is if these hoses are what came on a dual snorkel intake from the factory. They don't match up well with the scoops or air cleaner at all. Any insight?

 

Also, does anyone know the stock vaccuum hose routing for the second butterfly valve on the passenger side intake? Not sure what it's really called, actually, but I would like to hook it up the way it should be. (Nice shot of the new 140amp alt in here, too )

 

Last one

 

It doesn't look right in several ways....

Here's a really bad pic of how it's supposed to be. Looks to me like the main issue you have, is your A/C lines.

 

Here's mine, same problem. By the way, if you haven't already checked, make sure both vac motors function--open and close--as they should (I've replaced both). More importantly, both CaysE's offending hose (and mine) appear to come straight out, while RB's appears to bend downward, which would certainly route the hose beneath the air duct. RB, is that correct?

JamesC

 

The low-side A/C line on my car has a 45° fitting at the accumulator instead of a straight one; so that line comes out of the accumulator and goes downward. It runs all the way down to the "frame" by the fuel lines. Then it comes back up along the radiator water tank. That allows it to clear the right duct.

There's a little ear on the coolant bottle to hold up the scoop.

The 2 little "thermac" doors in the air cleaner are both controlled by the one thermal vacuum switch. I'll have to flip mine over and see if there's a T; I expect there is. One line goes to the carb to bring vacuum to the TVS; then the T splits the output of the switch to the 2 snorkels.

 

James, where did you get the vac motors from? I remember trying to find a replacement for the original air cleaner, but it seemed nobody carried the right one.

 

I purchased the first one in '01 from my local GM dealership, the second from GMPartsDirect in '03: This latter was a special order, so I don't know how available they are through GM. The GM part number by the way is as follows: 6488213.

JamesC

 

Yeah there are a few problems, like the AC hose.

But other than that, how does it run?

 

I wasn't able to find a driver's side L69 scoop.

I replaced the vacuum hoses on the air cleaner because the old hard ones that were on it when I got it were leaking at the thermo valve.

 

From the look of the pictures, the AC line doesn't seem to cause a problem with the dual snorkel air cleaner. I could be wrong, though.

Does the AC line inhibit the air flow to the air cleaner in any way?

 

Doesn't affect mine. It would be nice if the air hose went over the AC line instead of under, but that's only a factor when I want to remove it.

Looks like 3 of us started with LG4, and RB L69. Is it possible that AC line is another difference between the two? Or, is it model year? (The LG4's are 85/86's.)

 

It would seem so..... It wouldn't make a whole lot of sense to make a L69-compatible line in 83 for all cars when less than 4000 of the total production run was so equipped, and then discontinue that after the L69 became more popular, and go to non-L69-compatible hoses. Not that everything the factory does, makes sense; but I've been both a product and a manufacturing engineer for long enough to know that the scenario above is highly unlikely. Looks to me, like there's a specific A/C line package that goes with L69.

 

The scoop I recieved on the driver's side had the same P/N stamped on it as the one that was already on my car. You sure there's a different scoop for the L69? If so, I'm going to be a little peeved that I bought this thing with the wrong scoop on it.

 

The scoops from the L69 are wider in the back. The stock LO3 scoop will not fit the L69 drivers side hose.

 

Here is what mine looked like before I got the proper scoop. I was using tape to hold the hose on the scoop.

 

This is what it looks like now that I have the proper scoop.

 

is there any advantage over having the dual snorkle over an open eliment air cleaner? I have an 84 z28 H.O. If it is better to have the dual snorkle how much would it cost to get everything, and will it just drop right on an edelbrock 600 cfm carb?

 

You should already have the dual snorkel if you have an HO. Cooler air makes more power (though there is some controversy, I guess, about which is better, the dual snorkel or open element). Finding a dual snorkel with hoses and ducts will either be a stroke of luck and/or an expensive undertaking at this juncture--You could get lucky, however: I purchased mine for $30 at a bone yard and GM at that time could still provide the hoses and ducts. I 'believe' the dual will fit the Edelbrock, but I have no personal experience.

JamesC

 

I never realized how much difference theree was between 86 and 87. heres mine

 

I took some black duct tape, split it down the middle, and wrapped it around the scoop until the L69 duct would clamp onto it. It's not "right", but still miles ahead of a single snorkel LG4 system.

Open element caused off-idle dead spot for me. And, when the engine was hot, stumbles in stop & go driving.

 

has anyone routed the tubes down to the foglight holes?

 

Replace the vacuum motors? Unless you live in a REALLY cold climate my advice would be to just remove them completely. We regularly see 15-20 degree temps in winter here and engine warm up time was no slower after removing them.

Insert gratuitous dual snorkel pic here:

 

Well here's a 84 setup.

Auggie

 

One more.

 

Originally posted by sockfootball22
[B]is there any advantage over having the dual snorkle over an open eliment air cleaner? I have an 84 z28 H.O. If it is better to have the dual snorkle how much would it cost to get everything, and will it just drop right on an edelbrock 600 cfm carb?

One consideration is compliance with smog laws. Also, the dual snorkel pulls in cool air, whereas the open element does not (unless you have a hood scoop, I guess).

For that passenger side plastic duct, there are two possibilities:

1. One guy on this board took an LG4 driver's side duct, turned it upside down, modified it a bit and moved it over to the passenger side; It doesn't look bad, but then there is the next option:

2. Check with iroczdave. I got my used dual snork from him. I haven't checked his web site recently, but he usually has the air cleaner assembly on his web site. The scoops might be a little bit more difficult.

 

You can buy the RH and the LH snorkels from http:www.ramairbox.com

Auggie

 

There's no reason to route the tubes down to the foglight holes; they pick up air from the headlight holes.

Auggie, why did you move your cold-side A/C line to where it goes in front of the rad cap?

 

Good eye RB, but I can't take any credit for that. It came that why from the factory but mines an "84".

Auggie

 

No; it didn't come from the factory like that. Year model didn't change that. I've seen way too many.

 

made my own

 

RB, I bought the "84" Z28 new for my wife and took delivery in Oct. 0f "83". She couldn't drive it in the snow so I told her that I would drive it in the winter and she could drive it in the summer. That only lasted for a couple of years and its been put in storage in the winter ever since.

Auggie

 

Anyone know what that bar is... in Auggie's last picture just above the heat/AC fan?

And I gotta say Auggie, your car looks great.

 

Yes; that bar, is...... a bar. There's a little sheet metal type clip with a stud that clips into the windshield cowl, and a little screw that holds it to the hood hinge. It is of no structural significance; looks to me like it was some sort of assemlby aid at the factory, although I don't know what exactly.

Auggie, I think your lines belong like mine, and all the others in all these pics; looks like somebody somewhere along the line had their way with them. They don't belong like that.

 

Thanks for the complament CaysE. That bar has always been there and like RB said I have no idea what its for. There is no clip by the windshield cowl. Its bolted on at both ends.

I don't know what to say RB, but like I said I bought the car new and when I took delivery it had (5) miles on the odometer??? You did get me thinking though so I dug out my SM and found a pic of the AC hoses routing. Check this out. Doesn't quite look like mine. I took delivery in Oct. of 83 so maybe it was an early build and they made a running change??

Auggie

 

The pic is for LG4.... that routing is incompatible with the pass side duct for L69. Note that it also doesn't include the little 45° at the accumulator.

Here's another pic of mine. Not how the 2 lines are together, the hot line has a little "U" on the end of it that curls back toward the condenser, and the suction line goes right along with it, and down to the "frame", next to the liquid line which is aluminum tubing all the way along there.

Looks like on yours, somebody wanked the hot line off to the side at some point in its life for some reason.

Mine has the later model aluminum/plastic radiator with the heater hose fitting in it; that's why the heater hose is there, because it's easier and more secure to run it there and plug the water pump, than the other way around.

 

RB, no pic.

Auggie

 

CaysE, do you still need the vacuum hose routing fo your air cleaner??

Auggie

 

Details....

Sorry about that!!

 

Yah, I wish mine was like that. When I try to remove the rad. cap the hose's get in the way big time and yours looks a lot neater.

Auggie

 

The disconnected line goes to port "B" on the carb.

Auggie, I think if you mess with it a bit, you could probably put it back like it belongs.

 

Yup, thats it. He probely just needs a tee. I store my car in the winter so I don't use them.

Auggie