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  1. #1
    Join Date
    Jul 2018
    Location
    Highcross
    Posts
    11

    Clutch line size

    Dear all,

    I have received my AK gen 3 kit and like most my planning brain is ahead of my install. I have ordered a LS3 with Tremec 500 gear box but have read somewhere that the clutch line would benefit being of a large size to the break lines so as to give it a lighter feel. Could anybody enlighten me if this is true?

    Regards

    Ian

  2. #2
    Join Date
    Apr 2005
    Location
    Worcestershire
    Age
    44
    Posts
    2,154
    Yes, I think it needs a higher flow rate than the brake lines.

    I fitted a flexy hose on mine that ran over the bell housing.

  3. #3
    Join Date
    May 2004
    Location
    Finchampstead, Berkshire, UK.
    Age
    54
    Posts
    3,575
    Not sure it will make a difference to feel.

    Too thin a line will be a constriction to the flow of fluid, Chevy used this to save the driveline components from breaking when “enthusiastic” drivers dumped the clutch to break traction, the stock clutch line on LS1 Camaro’s needed to be drilled out (artificial constriction at the clutch end) to stop the clutch slipping for the first second or so.

    So bigger is better, too small is bad, not so sure about the feel though.

    Jim
    GD Mk3 Jag based
    Supercharged LS1
    GD J1M

  4. #4
    Join Date
    Jul 2018
    Location
    Highcross
    Posts
    11
    Many thanks for your replies looking on a lot of blogs and YouTube vids I think the clutch pipe is one line size more than the brake. When I mentioned feel I really meant how heavy the peddle would be. I drove a 3 litre Z4 a while ago which had a reasonably heavy peddle and in the whole ok, in traffic it was annoying.

    Regards

    Ian

  5. #5
    Join Date
    Sep 2014
    Location
    birmingham
    Age
    40
    Posts
    58

    Flexi

    Hi I wanted to use a flexible for mine and was advised against it as you couldn't get the bigger size...I tried it anyway and it's absolutely fine no issues...and it was very easy with it being a flexi, I got mine from one of the car shows made up while you wait for £35.
    I do everything twice as I like to find the hardest way first.
    Blog: www.pw60bra@blogspot.com

  6. #6
    Join Date
    May 2014
    Location
    Birmingham
    Age
    42
    Posts
    701
    Quote Originally Posted by cperry View Post
    Yes, I think it needs a higher flow rate than the brake lines.

    I fitted a flexy hose on mine that ran over the bell housing.
    Dito, i used a motorbike line with the right banjo bolts and a slave from a .75 feed.

    Alan.
    AK Gen II delivery date Oct '15
    IVA pass Dec '18.
    On the road Jan '19
    GM LQ4 364ci, LS9 cam, Omex 710.
    Tremec T56 Terminator.

  7. #7
    Join Date
    Jul 2014
    Location
    Longridge, Lancashire
    Age
    56
    Posts
    267
    When I first fitted the brake and clutch lines I did them all in 3/16". However, whilst looking through some photos of the latest AK demonstrator rolling chassis I realised that the clutch pipe was larger. After speaking with Jon an AK I have now changes to 1/4" pipe and the flexi was made by SpeedFlow for me in -4 teflon hose.

    The link to Speedflow is here. I phoned up and had a chat and the made exactly what I wanted.

    Must admit that finding 1/4" fittings is pretty difficult.

    Cheers,
    Stu
    Attached Images Attached Images
    AK427 Gen III, Ford 347, TKO600
    Build Blog:- stu238-ak427.blogspot.co.uk

  8. #8
    Join Date
    Apr 2005
    Location
    Worcestershire
    Age
    44
    Posts
    2,154
    Quote Originally Posted by Stu238 View Post
    Must admit that finding 1/4" fittings is pretty difficult.

    Cheers,
    Stu
    This is why I went for custom flexies in the end, I actually bent the pipe, clipped it to the car and took it all off after struggling to source one single fitting at either end.
    Regards

    Craig Perry

    No, I'm not "repairing" it, I'm fine tuning its performance.

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