|
Author
|
Topic: Fuel Line sizing
|
65_289
Gearhead Posts: 761
From:
Registered: Jul 2001
|
posted 04-16-2003 05:38 PM
   
Would there be any benefit of running a 1/2" fuel line if the inlet & outlet of the pump is 3/8"? Or would the extra capacity go to waste? I'm trying to decide what size line to run when I install the Mallory 140 & hook up the nitrous. Thanks!
IP: Logged |
Fastymz
Moderator Posts: 14201
From: Reno Nv USA MEM#1240
Registered: Apr 2001
|
posted 04-16-2003 07:07 PM
Are you going to run a line just for the nitrous?
I'd think that the 3/8's line would be big enough. ------------------
SCOOP
oddly obsessed with big scoops on little Mustangs 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
IP: Logged |
65_289
Gearhead Posts: 761
From:
Registered: Jul 2001
|
posted 04-16-2003 07:25 PM
quote:
Originally posted by Fastymz:
Are you going to run a line just for the nitrous?
I'd think that the 3/8's line would be big enough.
No, I'm running 1 pump for both. I'll put a "Y" in the engine bay & split to 2 regulators.
IP: Logged |
jkilroy
Gearhead Posts: 1797
From: Vicksburg, MS
Registered: Dec 99
|
posted 04-16-2003 11:58 PM
The price difference is minimal, run the larger line. Having too much fuel with N2O is not bad, *too* little is very bad.------------------
Jay Kilroy
68' Fastback GT 390
"No such thing as a cam thats too big"
IP: Logged |
65_289
Gearhead Posts: 761
From:
Registered: Jul 2001
|
posted 04-17-2003 12:22 AM
quote:
Originally posted by jkilroy:
The price difference is minimal, run the larger line. Having too much fuel with N2O is not bad, *too* little is very bad.
Good point! 
IP: Logged |
MrWesson22
Gearhead Posts: 1212
From: Dacula, GA
Registered: Sep 2000
|
posted 04-17-2003 05:51 PM
Is there really a bad side to running line larger than you need, either for motor or n2o?
------------------
Neal 69 Gulfstream Aqua Grande
351C/4sp
https://mustangsandmore.com/ubb/MrWesson22.html
IP: Logged |
Toronado3800
Gearhead Posts: 364
From: St. Louis, MO
Registered: Jul 2001
|
posted 04-17-2003 06:14 PM
I dunno for sure. But I could imagine a garden hose sized line might lower pressure...but would that hurt the amout of fuel available to your carb or injectors? While I'm wondering, does anyone buy fuel pumps for late model fuel injected cars for use on their hot rods? My Olds has 35lb an hour injectors and the guage on my 351W in my stang says that Carter pump only puts out 7lbs.
IP: Logged |
Fastymz
Moderator Posts: 14201
From: Reno Nv USA MEM#1240
Registered: Apr 2001
|
posted 04-17-2003 06:40 PM
I would think A line thats to big.Would lower the flow rate as the RPM's go up.You'd need a much larger pump,or many pumps to keep the same flow rate as a smaller line.
------------------
SCOOP
oddly obsessed with big scoops on little Mustangs 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
IP: Logged |
65_289
Gearhead Posts: 761
From:
Registered: Jul 2001
|
posted 04-17-2003 08:36 PM
This is interesting. I had never thought about losing pressure. I guess they make the inlets & outlets a particular size for a reason. I wonder if fuel pump flow rates are rated for a specific fuel line diameter. Anyone know?[edit] Mallory recommends a 3/8" or bigger line for the Comp 140, and it has 3/8" ports. So I guess that answers that.  Thanks for all the replies! [This message has been edited by 65_289 (edited 04-17-2003).]
IP: Logged |
Moneymaker
Administrator Posts: 21725
From: Lyons, IL, USA
Registered: May 99
|
posted 04-17-2003 08:40 PM
quote:
Originally posted by Toronado3800:
I dunno for sure. But I could imagine a garden hose sized line might lower pressure...but would that hurt the amout of fuel available to your carb or injectors? While I'm wondering, does anyone buy fuel pumps for late model fuel injected cars for use on their hot rods? My Olds has 35lb an hour injectors and the guage on my 351W in my stang says that Carter pump only puts out 7lbs.
Not with that bigass Mallory fuel pump it won't.
------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
IP: Logged |
65_289
Gearhead Posts: 761
From:
Registered: Jul 2001
|
posted 04-17-2003 08:42 PM
quote:
Originally posted by Moneymaker:
Not with that bigass Mallory fuel pump it won't.
LOL. If the Comp 140 is big-ass, what does that make the Comp 250?
IP: Logged |
bluestreek
Gearhead Posts: 1460
From: Athens,GA
Registered: Jul 2001
|
posted 04-17-2003 09:04 PM
quote:
Originally posted by 65_289:
LOL. If the Comp 140 is big-ass, what does that make the Comp 250?
I don't know, but if you hook a water hose to it you would have your own car wash! ------------------
1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank and girdle, 5.4 H-beams, Forged slugs, TFS alum. heads, ported Stealth 8020 intake, Xtreme 274 Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
2nd pass: 12.11 @ 114 mph
DanH
IP: Logged |
N266fords
Gearhead Posts: 1039
From: Spokane ,WA USA
Registered: Apr 2003
|
posted 04-18-2003 05:31 PM
run the 1/2 line but you may want to run a seperate fuel pump for your nos as to low of pressure from the fuel pump when the nos is flowing will lean your motor out not a good thing I say this if you are running over 100 hp shot also you will need to retard timing and run ressed (shorter) plugs and hotter ign lik msd if you are going 200hp or more of nos
IP: Logged |
65_289
Gearhead Posts: 761
From:
Registered: Jul 2001
|
posted 04-18-2003 06:03 PM
quote:
Originally posted by N266fords:
run the 1/2 line but you may want to run a seperate fuel pump for your nos as to low of pressure from the fuel pump when the nos is flowing will lean your motor out not a good thing I say this if you are running over 100 hp shot also you will need to retard timing and run ressed (shorter) plugs and hotter ign lik msd if you are going 200hp or more of nos
Thanks for the suggestion. I have a Hobbes switch that will turn of the nitrous if the fuel pressure drops too low. And it's an NX kit, not NOS.
IP: Logged |
Mustangsandmore Forums
UBBFriend: Email This Page to Someone! 
