Does anyone here use fuel rail cooling?

Duner · Jul 14, 2010

I'm happy to see other people doing this.:mullet:

modain · Jul 14, 2010

After reading thru this yesterday I decided I'd measure my fuel rails after my commute home. After the truck sat for about 2 minutes (time to fetch it from the garage) I zapped it with my laser temperature measurement thingy...

left rear - 137*
left front - 160*
right front - 162*
left rear - 165*

I didn't see the wide disparity between LF-RF as others pointed out, but it appears to me that my truck's fuel runs equally hot in three of the four points. So at least I should be getting uniform AFR thinning and correction.

I'll look into the heat wrap at the bare minimum.

akcooper9 · Jul 14, 2010

modain said:
left rear - 137*
left front - 160*
right front - 162*
left rear - 165*

Two left rears :huh:

Im guessing but I bet the 137 is the right rear???

I wonder what the values would look like with the engine running? (not sure if it would make a difference)

irnwkrkev · Jul 14, 2010

I'd be curious to know the temps with it running as well, heat transfers pretty quickly.

modain · Jul 14, 2010

I can measure that. The temps had dropped by about 5* when I rechecked them a few minutes later. Nothing controlled or scientific...

modain · Jul 14, 2010

akcooper9 said:
Two left rears :huh:

Im guessing but I bet the 137 is the right rear???

I wonder what the values would look like with the engine running? (not sure if it would make a difference)

OK Mr. Wiseguy :jester: ...

left rear - 137*
left front - 160*
right front - 162*
right rear - 165*

I guess it wouldn't have hurt to fact check before I pressed "Submit Reply".

t vago · Jul 15, 2010

modain said:
left rear - 137*
left front - 160*
right front - 162*
right rear - 165*

That left front temp is kind'a high. Are you sure you shot the fuel rail?

Also, do you have 3 cats or just one? If you have 3 cats, you might not see as much of an improvement as I did, because your PCM would be able to mostly correct for the fuel temperature (and density) imbalance because it can read each bank AFR separately. I only have one cat, so my PCM gets to read the combined average from all 8 cylinders.

t vago · Jul 15, 2010

Tonight, I started up and let the truck idle for about 5 minutes after letting it sit for about 40 minutes after a 10 mile drive.

Front left: 169.1
Middle left: 161.1
Rear left: 168.9

Front right: 169.6
Middle right: 161.6
Rear right: 169.3

Y-connector: 145.1

Fuel inlet (stock fuel line): 135.0

Keep in mind that the idea is not so much to keep the fuel cool, but rather that the fuel is made to be approximately the same temperature when it gets to each of the fuel injectors.

modain · Jul 15, 2010

t vago said:
That left front temp is kind'a high. Are you sure you shot the fuel rail?

Um, yeah. I know what the fuel rail is. I shot it many times and that was the reading I got.

t vago said:
Also, do you have 3 cats or just one? If you have 3 cats, you might not see as much of an improvement as I did, because your PCM would be able to mostly correct for the fuel temperature (and density) imbalance because it can read each bank AFR separately. I only have one cat, so my PCM gets to read the combined average from all 8 cylinders.

Three cats, four O2 sensors.

J04dakota · May 20, 2016

Fuel rail mod

I know this thread is old but I'd like to know if it can be done with stainless braided line? Any help is appreciated.Thank you

t vago · May 20, 2016

I imagine it can be done with braided s/s fuel line. Summit Racing carries 3 ft lengths of -4AN hose, http://www.summitracing.com/parts/aer-fca0403; and 3 ft lengths of -6AN hose, http://www.summitracing.com/parts/aer-fca0603 . That, along with suitable crimped fittings, should work.

J04dakota · May 20, 2016

Fuel rail mod

I kinda had a idea that it would work but want sure if they made all those fittings for braided line too. Thank you

AIR_RAM · May 20, 2016

I do know that simply insulating the fuel rails is worth approximately 15RWHP... I used to insulate both my fuel rails and the bottom side of my intake manifold... as well as my cold air intake. I know it was worth something because my truck was always much quicker than trucks similarly modded 4.7L trucks.

SPEED SAFE, AIR RAM

J04dakota · May 20, 2016

Fuel rail mod

Wow. Thata pretty impressive, I can definitely believe it though. I'm gonna wrap all the lines and rails when I have it apart. What's the best insulator you've came across? And I really need to know if its alright to mount my wideband before the cat? I have a 04 dakota 4.7 and there ain't much space before the car and i don't know how hot it gets. I have the innovate Db/lc2 setup and it says not to exceed 900 degrees Fahrenheit. Any help would be awesome.

J04dakota · May 20, 2016

Fuel rail mod

I know I should start a new thread but you guys were responding and I need to get this thing welded in. Anybody know if it's to hot before the car for a wideband?

Burned · May 21, 2016

AIR_RAM would you care to share what you used to insulate the fuel rail?

J04dakota · May 25, 2016

Air_Ram. What material did you use for insulating? I don't want to get a crappy material and it not so a good job at keeping the heat away. More or less what brand is good to use?

AIR_RAM · Jun 7, 2016

I used 2" insulation Wrap

and a large bag of 4" zip ties... Be careful NOT to allow the aluminum foil to touch the alternator positive connection.

I also insulated the bottom side of the intake manifold with a wider roll of the same style... packed it in between the creases until the bottom was smooth round. then covered that up with Foil tape right up to the edge of mounting.

here is a pic of my fuel rail (on top) you can clearly see insulated.

I miss this shit!

Speed safe, AIR RAM

moparsz · Jun 7, 2016

I could use one of those

Burned · Jun 7, 2016

Thanks AIR_RAM for the reply with detailed info. :smile:

Does anyone here use fuel rail cooling?

Duner

modain

akcooper9

irnwkrkev

modain

modain

t vago

t vago

modain

J04dakota

t vago

J04dakota

AIR_RAM

J04dakota

J04dakota

Burned

J04dakota

AIR_RAM

moparsz

Burned

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