fuel log vs line to each bowl [Archive] - Chevelle Tech

: fuel log vs line to each bowl


curley8788
Dec 7th, 10, 11:24 PM
given the choice of a fuel log or a fuel line from the regulator to each bowl, is there any difference or advantage over one setup or the other?

trmnatr
Dec 7th, 10, 11:52 PM
I like to run a fuel line to each bowl but just my opinion

Eric68
Dec 8th, 10, 12:19 AM
Fuel line to each bowl for sure!

If you ever tune you can take the bowls off individually with separate lines -- you don't even have to disconnect the fuel line from the bowl.

Fuel logs do look cool though.

trmnatr
Dec 8th, 10, 2:11 AM
Also is he talking about a fuel log dual feed unit OR a "REGULATOR MANIFOLD"

Some people call a Regulator Manifold a fuel log

curley8788
Dec 8th, 10, 3:32 AM
i mean this:

https://www.circletracksupply.com/images/T/fuellog-01.jpg

trmnatr
Dec 8th, 10, 4:46 AM
That appears to be a "dual feed line" and not a log but the pic is so small

This is what I consider a fuel log
http://www.jegs.com/i/Barry+Grant/132/170031/10002/-1

dreis454
Dec 8th, 10, 8:20 AM
i mean this:

https://www.circletracksupply.com/images/T/fuellog-01.jpg

too many 90* angles :yes:

crazydavey
Dec 8th, 10, 12:42 PM
I'm using this one Mike...works fine....you can change jets without unhooking anything,,,,

http://www.summitracing.com/parts/SUM-220104-N/?rtype=10


;)

jbird
Dec 8th, 10, 11:43 PM
Main reason to run a log (not really what you have pictured), is if you run a return line and bypass regulator. This way the regulator is completely out of the fuels path to the carb. The regulator is on the outlet side of the log.

http://static.summitracing.com/global/images/prod/large/aei-17248_17249_w.jpg

Sinister
Dec 9th, 10, 12:11 AM
Main reason to run a log (not really what you have pictured), is if you run a return line and bypass regulator. This way the regulator is completely out of the fuels path to the carb. The regulator is on the outlet side of the log.

http://static.summitracing.com/global/images/prod/large/aei-17248_17249_w.jpg

Do you have a link to that one? I like it. :yes:

jbird
Dec 9th, 10, 12:24 AM
Do you have a link to that one? I like it. :yes:

Summit racing. Do a search.

Sinister
Dec 9th, 10, 12:29 AM
Wow! That thing is pricey...

Bud Crayne
Dec 9th, 10, 12:46 AM
As long it's not the "double flying trapezes" strung out & over from the fenderwell, it's worth a million. :)

BillyGman
Dec 9th, 10, 3:41 AM
.... This way the regulator is completely out of the fuels path to the carb. The regulator is on the outlet side of the log.

http://static.summitracing.com/global/images/prod/large/aei-17248_17249_w.jpg Is that so important? And if so, then why?What is the benefit? And how can the regulator actually keep the fuel pressure that's entering the bowls under 8 PSI if the regulator is not in path leading to the bowls? :confused:

Calculated Risk
Dec 9th, 10, 6:26 AM
Is that so important? And if so, then why?What is the benefit? And how can the regulator actually keep the fuel pressure that's entering the bowls under 8 PSI if the regulator is not in path leading to the bowls? :confused:

^^^^ it's a bypass regulator on the end of a log.

Bypass regulators control pressure by varying the amount of fuel going back to the tank. On a regular bypass regulator the fuel is technically going to the carbs prior to going to (actually through) the regulator.

Here on my setup it's the same thing as a fuel log. Fuel goes in the side under the "A" symbol, goes to each bowl unrestricted, once 8 psi is reached going to each bowl the pressure pushes up on the diaphram and there is a check ball on the bottom that unseats to allow fuel to return to the tank.

http://i145.photobucket.com/albums/r215/jrn182/Rick/Chevelle/IMG_2102.jpg

i prefer the above instead of a log so you can make jet changes easier. I can leave the lines going to the bowl attached.

Motorvation
Dec 9th, 10, 9:39 AM
I've used this Moroso Fuel Log http://www.summitracing.com/search/Department/Air-Fuel-Delivery/Section/Fuel-Pumps-Regulators/Brand/Moroso/Part-Type/Fuel-Logs/?Ns=Rank%7cAsc
You'll need a tank return line. I plumbed with -8AN braided from separate ports which made everything serviceable. Works with Alky, too. Not overly pricey at under $100....

Steve O.

BillyGman
Dec 9th, 10, 1:52 PM
^^^^ it's a bypass regulator on the end of a log.

Bypass regulators control pressure by varying the amount of fuel going back to the tank. On a regular bypass regulator the fuel is technically going to the carbs prior to going to (actually through) the regulator.

Here on my setup it's the same thing as a fuel log. Fuel goes in the side under the "A" symbol, goes to each bowl unrestricted, once 8 psi is reached going to each bowl the pressure pushes up on the diaphram and there is a check ball on the bottom that unseats to allow fuel to return to the tank.

http://i145.photobucket.com/albums/r215/jrn182/Rick/Chevelle/IMG_2102.jpg

i prefer the above instead of a log so you can make jet changes easier. I can leave the lines going to the bowl attached. Rick, I fully understand what's going on in the pic above that you have posted. That regulator you have is very similar to the one I recently bought for my car, which is below...

http://aeromotiveinc.com/wp-content/uploads/wpsc/product_images/13202.jpg

....but what you have and what I just bought are different than that fuel log, right? Because with your set-up, the fuel is still going into the ports on the regulator before it goes to the carb bowls. But with that fuel log, it goes to the bowls BEFORE it ever enters the regulator. Is that correct? If it is, then how can the regulator control the fuel pressure entering into the bowls? :confused: If I am missing something, please explain.

jambb
Dec 9th, 10, 2:18 PM
given the choice of a fuel log or a fuel line from the regulator to each bowl, is there any difference or advantage over one setup or the other?

The fuel log would not be a problem at all,I use them on my 540 BBC with spray works just fine.

BillyGman
Dec 9th, 10, 3:40 PM
If Aeromotive makes them, I'm sure they're fine. I just don't understand how a regulator being placed downstream from the carb fuel bowls rather than upstream can do what it's supposed to do. Apparently it does, but I just don't understand how.

BillyGman
Dec 10th, 10, 4:37 AM
OK, a buddy of mine just explained this pressure regulator thing being placed downstream of the fuel bowls and how it regulates the pressure: He said that it kinda operates like a waste gate in a turbo does. Once the fuel pressure coming from the pump and entering into the regulator inlet port reaches a certain level, it opens up completely to bleed off the excess pressure. When he used the turbo waste gate analogy, it helped me to get a better understanding of it. So just in case I wasn't the only one that wasn't getting a clear picture in their mind's eye of how this fuel log operated with the regulator being mounted at the end of it, I figured that I would share that explanation that my buddy shared with me. Carry on...

ChevelleRob
Dec 10th, 10, 10:48 AM
I have the Magna Fuel 2 port log with a pressure control valve on the end to return back to the tank.