Gain extra benefits by becoming a Supporting Member Click here find out how!
Classic Performance Products Classic Parts
Ciadella InteriorsAmerican Auto Wire Classic Industries
Chevs of the 40sDanchuk Catalog
Hellwig Products IncPerformance Rod & CustomEcklers AutoMotive
Nu-Relics Power Windows
Impala Bob's Bob's Chevy Trucks Bob's Chevelle Parts Bob's Classic Chevy



 Page 8 of 8 « First<5678
Username Post: 55 Sport Coupe - 396 LT1 - T56        (Topic#292613)
Bluemeany 
Senior Member
Posts: 830
Bluemeany
Loc: Santa Clara, CA
Reg: 05-31-02
02-07-18 12:22 PM - Post#2723655    
    In response to 2Loose

Link

57 Hardtop 302 & 3 Speed stick w/OD;
93 Camaro Indy Pace Car


 

2Loose 
"13th Year" Platinum Supporting Member
Posts: 4329
2Loose
Age: 76
Loc: Sandwich Isles
Reg: 03-17-03
02-07-18 12:29 PM - Post#2723657    
    In response to Bluemeany

Not sure I want a non-adjustable PR on there for this setup, and it seems to duplicate my adjustable Aeromotive PR that will be mounted on the firewall next to the motor...

Just trying to figure all this out....





 
2Loose 
"13th Year" Platinum Supporting Member
Posts: 4329
2Loose
Age: 76
Loc: Sandwich Isles
Reg: 03-17-03
02-07-18 12:48 PM - Post#2723660    
    In response to 2Loose


I would think this Aeromotive fuel PR valve mounted right next to the motor would provice all the fuel control I need, and I think I can remove the stock, non-adjustable unit on those '93 fuel rails, and eliminate the fuel return directly from the fuel rails, but I am only guessing!

Aeromotive also suggests running two inlets to the fuel rails from a tee, and at the other end of the fuel rails, combine the outlets into the Aeromotive PR and then return to the fuel tank. That seems excessive to me for this particular application, the most likely setup from what I can see now, is to eliminate that stock unit on the fuel rail, plug that hole, and feed the fuel rails inlet directly from the Aeromotive PR unit.

The Aeromotive unit has a vacuum tap available, but I'm thinking I probably won't need to use it. Leave it at atmospheric sensing.



 
WagonCrazy 
"11th Year" Platinum Supporting Member
Posts: 3048
WagonCrazy
Loc: So Cal
Reg: 06-07-05
02-07-18 05:21 PM - Post#2723683    
    In response to 2Loose

  • Quote:
I would think this Aeromotive fuel PR valve mounted right next to the motor would provice all the fuel control I need, and I think I can remove the stock, non-adjustable unit on those '93 fuel rails, and eliminate the fuel return directly from the fuel rails, but I am only guessing!

Aeromotive also suggests running two inlets to the fuel rails from a tee, and at the other end of the fuel rails, combine the outlets into the Aeromotive PR and then return to the fuel tank. That seems excessive to me for this particular application, the most likely setup from what I can see now, is to eliminate that stock unit on the fuel rail, plug that hole, and feed the fuel rails inlet directly from the Aeromotive PR unit.

The Aeromotive unit has a vacuum tap available, but I'm thinking I probably won't need to use it. Leave it at atmospheric sensing.



Your logic is sound to me, but Ive' never plumbed in a system like you have before.

With my LS1 engine, the Fuel Regulator is at the back of the wagon, about a foot forward from the in-tank fuel pump. So the return line is very short. It just allows the properly pressured volume of fuel to travel forward to the engine, with the rest of it going back into the tank (via a short run of line).

Not sure why you would need to plumb your FR at the front by the engine. Why not back by the tank so you can eliminate the length of fuel sloshing between 2 lines along the entire frame rail?

In which case you could eliminate all that junk at the fuel rail as you mentioned.


57 Nomad -LS1 with C4 suspension
59 Apache Fleetside Shortbed BigWindow



Edited by WagonCrazy on 02-07-18 05:23 PM. Reason for edit: No reason given.

 
Bluemeany 
Senior Member
Posts: 830
Bluemeany
Loc: Santa Clara, CA
Reg: 05-31-02
02-08-18 10:53 AM - Post#2723757    
    In response to 2Loose

It is very interesting to read through your posts on this build and see the problems that come up and your resolve.

I think both your Aeromotive PR or the stock PR, use the vacuum pressure input to properly regulate the fuel flow. Lower vacuum pressure requires higher fuel flow and conversely, higher vacuum pressure requires lower fuel flow.

Regarding the fuel return lines, your sketch in your previous post looks correct. Some of the return fuel dumps into the PR, and extra fuel returns to the tank. All this plumbing is extra work but keeps the system in balanced pressure and proper flow. Shortcutting might create problems IMO. I'm not an expert or have experimented the absolute necessity of the vacuum line or the routing of the return lines. My reasoning is that the factory would not include anything extra unless it is absolutely necessary.

57 Hardtop 302 & 3 Speed stick w/OD;
93 Camaro Indy Pace Car


 
2Loose 
"13th Year" Platinum Supporting Member
Posts: 4329
2Loose
Age: 76
Loc: Sandwich Isles
Reg: 03-17-03
02-08-18 11:17 AM - Post#2723760    
    In response to WagonCrazy

I have some of those same questions, am learning, will let you know as/if I can come up with some reasonable information.

The best I've been able to come up with now, is that this speed density efi system depends on very rapid fuel pressure adjustments as the fuel demand at the injectors changes. I'm now advised to set my Aeromotive pressure at 46 psi, mount it close to the motor, leave the Aeromotive vacuum port open to ambient pressure, and as that fixed fuel rail return pressure regulator is set at 42 psi, it constantly bleeds off 4 psi to the return line from the fuel rails, and the vacuum port will increase that slightly when the vacuum drops in the plenum upon acceleration, trying to offset a fuel lean situation at sudden acceleration. Hence the fuel return line at the fuel rails, and the slightly higher pressure feed into the fuel rail system.

At least that's my understanding at the moment, and this is all new info for me, I've never done an efi system before.
Willy



 
2Loose 
"13th Year" Platinum Supporting Member
Posts: 4329
2Loose
Age: 76
Loc: Sandwich Isles
Reg: 03-17-03
02-18-18 07:32 PM - Post#2724814    
    In response to 2Loose

Lots of family visiting, difficult to get any real time out in the shop.

Still checking out the fuel efi setup, just how I want to try it.



 
vabeach56wagon 
Valued Contributor
Posts: 3092
vabeach56wagon
Loc: Chesapeake,VA,
Reg: 04-22-02
04-16-18 11:40 AM - Post#2731172    
    In response to 2Loose

Before it's too late, please consider mounting your lines on the exterior of the frame, as the NHRA used to require. I ran a similar AN-8 set on the wagon and crossed over the frame just aft of the upper control arm.

Relocated all brake lines to the outside of the driver side of the frame also.

"Gobstomper": '56 210 9 passenger wagon.


Gobstomper Photo Site

Mechanical Music


 

 Page 8 of 8 « First<5678
Icon Legend Permissions Topic Options
Report Post

Quote Post

Quick Reply

Print Topic

Email Topic

34409 Views
FusionBB
FusionBB™ Version 2.1
©2003-2006 InteractivePHP, Inc.
Execution time: 0.204 seconds.   Total Queries: 17   Zlib Compression is on.
All times are (GMT -0800) Pacific. Current time is 07:39 AM
Top