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Fuel Line Size For Turbo


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#1 MINI-TURBO

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Posted 16 June 2016 - 11:15 AM

hi everyone, I'm about to fit my fuel lines to my mini turbo and have been doing some research on what sizes i need to run. lots of people have run 8mm inner diameter feed and 10mm return. or 8mm inner diameter for both.

i have a roll or 10mm outer diameter in the garage which is around 8.2mm inner diameter will this be sufficient enough? with my engine spec i should see somewhere between 160-180bhp 



#2 coopdog

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Posted 16 June 2016 - 05:44 PM

Well if your looking for that amount of power you don't want to risk fuel starvation

You need 10mm id for both

#3 jt19

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Posted 16 June 2016 - 08:47 PM

I reckon the stuff you have should be fine.
The fuel reg is only 8mm usually.
My lines are 8mm anyway and it seems to work fine.

#4 Turbo Phil

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Posted 17 June 2016 - 09:19 AM

8mm ID will be more than sufficient.

Phil.

#5 jt19

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Posted 17 June 2016 - 12:37 PM

I'm sure my silicone hoses are 8mm ID and my solid copper fuel pipe is 8mm OD. It seems to work fine at the moment.

#6 Rob Gavin

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Posted 17 June 2016 - 01:52 PM

I'm running 8mm OD supply and 10mm OD return without issue although there was a recent post in which it was suggested the 10mm was overkill these days.  I'm using microbore from B&Q



#7 jt19

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Posted 17 June 2016 - 04:04 PM

What boost and power you running rob?

#8 matty...

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Posted 17 June 2016 - 05:06 PM

8mm is fine for both.

#9 jt19

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Posted 17 June 2016 - 05:53 PM

At the end of the day it's 6mm going into the car anyway! Lol always going to have a 'bottle neck'

#10 MINI-TURBO

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Posted 17 June 2016 - 10:03 PM

thanks for all the replies guys, I will use what i have for now then if i have any issues i will go bigger



#11 Ratty93

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Posted 18 June 2016 - 07:36 PM

Im running 6mm feed as normal and 8mm id for return and I have no problems running between 10 and 14 psi but haven't dyno run it to see bhp

#12 MarkyRich

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Posted 16 August 2016 - 03:45 PM

Ive got some 10mm OD (7mm ID) from Scewfix. will that be ok???



#13 Northernpower

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Posted 16 August 2016 - 06:48 PM

Ive got some 10mm OD (7mm ID) from Scewfix. will that be ok???

If its copper pipe be aware is does work harden. It needs supporting more than genuine fuel pipe; at least every 150mm and best practice (because of the work hardening) means the ends shouldn't be unsupported otherwise over time, it will fracture.

#14 MarkyRich

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Posted 16 August 2016 - 07:27 PM

 

Ive got some 10mm OD (7mm ID) from Scewfix. will that be ok???

If its copper pipe be aware is does work harden. It needs supporting more than genuine fuel pipe; at least every 150mm and best practice (because of the work hardening) means the ends shouldn't be unsupported otherwise over time, it will fracture.

 

Thanks Buddy.

 

Will the 7mm be sufficient though. Everywhere i went only seem to have this size?? my set up should turn out about 160-170 BHP?


Edited by MarkyRich, 16 August 2016 - 07:28 PM.


#15 Northernpower

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Posted 16 August 2016 - 07:38 PM


 

Ive got some 10mm OD (7mm ID) from Scewfix. will that be ok???

If its copper pipe be aware is does work harden. It needs supporting more than genuine fuel pipe; at least every 150mm and best practice (because of the work hardening) means the ends shouldn't be unsupported otherwise over time, it will fracture.
 
Thanks Buddy.
 
Will the 7mm be sufficient though. Everywhere i went only seem to have this size?? my set up should turn out about 160-170 BHP?
Normally you would use fuel pipe size AN6 which is 8mm. There was a K head 1460 on the rollers just after mine and he had fitted 8mm bore and it gave 155bhp on petrol and 205bhp with NOS. Have you tried the turbo forum?




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