Donations towards server fund so far this month.

 
£0.00 / £100.00 per month
Page:
Home > Technical Chat > Internal fuel lines

lee.pb

User Avatar

1425 Posts
Member #: 9199
Post Whore

Lancashire

After messing up way to much copper trying to copy my old lines decided to put the lines inside the mini.

Going to use 8mm ID and 10 ID braided hose.

Wheres the best place to get this from ?

1. local hydraulics
2. ebay
3. a n other

What the mind can conceive the mini can achieve
MITP 2012 17.01 seconds 1/4 mile against "The Don"
MITP 2013 16.83 seconds 1/4 mile


Brett

User Avatar

9502 Posts
Member #: 1023
Post Whore

Doncaster, South Yorkshire

I got my last lot from ebay almost 1/3 price of halfords
wasnt braided though just goodyear injection fuel line on a roll

Yes i moved to the darkside *happy*

Instagram @jdm_brett


stevieturbo

3588 Posts
Member #: 655
Post Whore

Northern Ireland

I assume by internal you mean inside the cabin.

If so, then you really need to use teflon hose otherwise the car will stink like fuck of petrol.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will


lee.pb

User Avatar

1425 Posts
Member #: 9199
Post Whore

Lancashire

Already stinks of fuel but dont want it any worse.


On 13th Apr, 2014 stevieturbo said:
I assume by internal you mean inside the cabin.

If so, then you really need to use teflon hose otherwise the car will stink like fuck of petrol.

What the mind can conceive the mini can achieve
MITP 2012 17.01 seconds 1/4 mile against "The Don"
MITP 2013 16.83 seconds 1/4 mile


benjy_18

User Avatar

105 Posts
Member #: 9378
Advanced Member

Chobham

I've used aluminium hardline from goodridge, but if you didn't get on with copper I wouldn't use the alu. Otherwise I get all my braided hose from torques uk on ebay


lee.pb

User Avatar

1425 Posts
Member #: 9199
Post Whore

Lancashire


Been looking at torques uk, need around 4m to run from tank to FPR, going to give abel hydraulics a call tomoz to see if i can get a better price.

On 13th Apr, 2014 benjy_18 said:
I've used aluminium hardline from goodridge, but if you didn't get on with copper I wouldn't use the alu. Otherwise I get all my braided hose from torques uk on ebay

What the mind can conceive the mini can achieve
MITP 2012 17.01 seconds 1/4 mile against "The Don"
MITP 2013 16.83 seconds 1/4 mile


Sprocket

User Avatar

11046 Posts
Member #: 965
Post Whore

Preston On The Brook

Not sure 10mm return is required. 8mm return will be more than adequate. Remamber that tube is measured in OD and hose measured in ID, therefore 8mm hose has a larger bore than 8mm tube.

On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be...
So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'...


On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........


lee.pb

User Avatar

1425 Posts
Member #: 9199
Post Whore

Lancashire


Been looking at AN-6 Teflon Braided Steel Hose, which has an ID of 8mm.

Would that be acceptable for flow and return ?

Need 2 x 4 meters.

http://www.ebay.co.uk/itm/AN-6-6AN-JIC-6-M...=item53ffa7bf80

On 13th Apr, 2014 Sprocket said:
Not sure 10mm return is required. 8mm return will be more than adequate. Remamber that tube is measured in OD and hose measured in ID, therefore 8mm hose has a larger bore than 8mm tube.

What the mind can conceive the mini can achieve
MITP 2012 17.01 seconds 1/4 mile against "The Don"
MITP 2013 16.83 seconds 1/4 mile


Sprocket

User Avatar

11046 Posts
Member #: 965
Post Whore

Preston On The Brook

8mm OD tube flow and return would be more than adequate, ergo 8mm hose flow and return will be much more than adequate.

10mm ID hose will be quite chunky

On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be...
So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'...


On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........


theoneeyedlizard

User Avatar

7265 Posts
Member #: 1268
The Boom Boom speaker Police!

Essex

I'm about to swap to Teflon hose in mine. It's had normal injection hose for the last 3 years and it stinks in the car.

In the 13's at last!.. Just


stevieturbo

3588 Posts
Member #: 655
Post Whore

Northern Ireland




On 13th Apr, 2014 lee.pb said:

Been looking at AN-6 Teflon Braided Steel Hose, which has an ID of 8mm.

Would that be acceptable for flow and return ?

Need 2 x 4 meters.

http://www.ebay.co.uk/itm/AN-6-6AN-JIC-6-M...=item53ffa7bf80

On 13th Apr, 2014 Sprocket said:
Not sure 10mm return is required. 8mm return will be more than adequate. Remamber that tube is measured in OD and hose measured in ID, therefore 8mm hose has a larger bore than 8mm tube.


-6 teflon would be fine for both..

Actual fittings will reduce bore size slightly, but not a lot. No different than using 8mm hardline tubing which would also be measured in OD, so smaller ID.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will


Sprocket

User Avatar

11046 Posts
Member #: 965
Post Whore

Preston On The Brook

It is not necessarily the size of the bore that is the problem, it is the length of the run.

On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be...
So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'...


On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........


lee.pb

User Avatar

1425 Posts
Member #: 9199
Post Whore

Lancashire


Its just short of 4m when i measued it from the fuel tank to the FPR.

On 13th Apr, 2014 Sprocket said:
It is not necessarily the size of the bore that is the problem, it is the length of the run.

What the mind can conceive the mini can achieve
MITP 2012 17.01 seconds 1/4 mile against "The Don"
MITP 2013 16.83 seconds 1/4 mile


Brett

User Avatar

9502 Posts
Member #: 1023
Post Whore

Doncaster, South Yorkshire

Is there a general rule hp - fuel line size?

Yes i moved to the darkside *happy*

Instagram @jdm_brett


Star Mag

User Avatar

1745 Posts
Member #: 375
Post Whore

Leicestershire

I got rid of the smell of fuel in my car by using Teflon lines. I got it from the local hydraulic place and then got the fittings from torques uk.


stevieturbo

3588 Posts
Member #: 655
Post Whore

Northern Ireland




On 14th Apr, 2014 Brett said:
Is there a general rule hp - fuel line size?


Not sure.

But it's a struggle to get a needle valve larger than 1/8" on an SU, in fact even 1/8" is difficult, that's 3.175mm diameter

Even 8mm OD hardline will be about 6mm ID. That equates to almost 4x the CSA of the needle valve.

Yes bends, length of hose etc restricts a little. But as pressure is maintained and local to the carb, dont see most restriction as a big deal.

I used 8mm OD nylon tube for feed/return with the usual Malpassi regulator about 17 years ago when I had a 3.9 twin turbo Rover V8 blowing through a Holley. Had maybe 400hp or so at the time, maybe a little more. It seemed to cope fine.


And when using teflon/braided type hose, you shouldnt really mix/match different brands parts. There can be small differences in specifications which may lead to problems.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will


apbellamy

User Avatar

16540 Posts
Member #: 4241
King Gaycharger, butt plug dealer, Sheldon Cooper and a BAC but generally a niceish fella if you dont mind a northerner

Rotherham, South Yorkshire

Brett's running a Datsun engine though *wink*

On 11th Feb, 2015 robert said:
i tried putting soap on it , and heating it to brown , then slathered my new lube on it

*hehe!*


Brett

User Avatar

9502 Posts
Member #: 1023
Post Whore

Doncaster, South Yorkshire




On 14th Apr, 2014 stevieturbo said:



On 14th Apr, 2014 Brett said:
Is there a general rule hp - fuel line size?


Not sure.

But it's a struggle to get a needle valve larger than 1/8" on an SU, in fact even 1/8" is difficult, that's 3.175mm diameter


i never really thought about the carbs restrictions i guess thats when you would run into the problem of sucking the float bowl dry when booting it for too long




On 14th Apr, 2014 apbellamy said:
Brett's running a Datsun engine though *wink*


yeah i was asking in general because im sure the skyline has 8mm hard lines and people run 6-700hp on these with just an after market pump and bigger injectors

on my mini i calculate to need shift something like 4l per min which doesnt sound like a great deal at all

Yes i moved to the darkside *happy*

Instagram @jdm_brett


jakejakejake1

User Avatar

293 Posts
Member #: 10010
Senior Member

Northants

I think its not an issue if the pump is man enough to cope.

As if the pump can supply enough pressure it doesn't matter what size feed pipes you have to an extent. If you had 100 bar at the end of a 3mm ID pipe you would probably get a lot more flow than 3 bar at the end of an 8mm pipe.

And the return line only needs to be big enough so it can flow the left over fuel back to the tank.
So in a car with more power, but a similar pump, you could get away with smaller return lines as there would be less excess fuel surely?


Sprocket

User Avatar

11046 Posts
Member #: 965
Post Whore

Preston On The Brook

It matters on the return line since if there is any resistance, the pressure drop can excede the set pressure of the regulator.

for example, a 6mm return can cause gretaer than 3psi pressure drop depending on the volume flow of fuel (choice of fuel pump) resulting in a higher than normal fuel pressure off boost.

A 6mm flow line is not an issue ( did the standard metro turbo not use a 6mm flow?), but the return needs to be a bit bigger to reduce it's pressure drop and avoid affecting the set pressure at the regulator

On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be...
So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'...


On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........


stevieturbo

3588 Posts
Member #: 655
Post Whore

Northern Ireland




On 14th Apr, 2014 Brett said:


yeah i was asking in general because im sure the skyline has 8mm hard lines and people run 6-700hp on these with just an after market pump and bigger injectors

on my mini i calculate to need shift something like 4l per min which doesnt sound like a great deal at all


Variables.

Subaru OEM 8mm OD hardline will support around 500, 550 at a push. It does have lots of 90deg bends in it though as it travels up the car.

But you cant really compare a 5psi carb flow with 50, 60, 70, 80psi EFI flow. Obviously the EFI will flow more for the same pipe diameter.

So it probably is possible for a "straight" or almost straight 8mm OD hardline hose to support 6-700hp without too much difficulty. By straight I mean no silly 90deg formed bends everywhere, and certainly not lots of them.

Ive flow tested my entire fuel system and measured it out the -6 return line. At 60psi test pressure and a 13v, my 2 x 044's were able to push almost 500lph out the single -6 line.
If it had been 14v, it would have been 500lph.

That's a hell of a lot of fuel out a relatively small pipe !

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

Home > Technical Chat > Internal fuel lines
Users viewing this thread: none. (+ 1 Guests)  
To post messages you must be logged in!
Username: Password:
Page: