User Tag List

+ Reply to Thread
Results 1 to 7 of 7

Thread: 1600 Kent engine + A6 cam + EFI

  1. #1
    Bodger wxneypar's Avatar

    Join Date
    Mar 2011
    Location
    Montevideo, Uruguay
    Age
    35
    Posts
    110
    Thanks
    10
    Thanked 6 Times in 5 Posts

    1600 Kent engine + A6 cam + EFI

    Hi everyone! Hope you are all doing great.

    Here's the power plot of another project we've been working on, it is another pushrod engine but this time for track days so no regulations to adapt to:
    Blue line is power at the wheels and yellow one is at the flywheel

    Click image for larger version Name:	IMG_20191101_134106.jpg Views:	72 Size:	128.2 KB ID:	84743

    Click image for larger version Name:	73375521_2352620691629484_7769129130137747456_o.jpg Views:	71 Size:	80.8 KB ID:	84744

    Here's the spec:
    1600 cc
    Forged rods and pistons
    1300 Flywheel
    Fully balanced
    Around 42mm and almost 35mm valves
    Huge ports head
    10.7:1 CR
    Kent cams A6
    45mm TB
    FuelTech full ignition and fuel management

    Being a dizzy and DCOE fan I have to admit the driveability, flexibility and torque figures EFI provides are incredible.
    We are super happy with the 153bhp as this is it's first run and there's some room for improvement.

    We are still trying to find out what can cause the power to start to drop so early considering the theoretical power band of the cam, any thoughts?
    Have a great weekend!

    Peter
    Last edited by wxneypar; 01-11-2019 at 18:17.

  2. #2
    TURBOSPORT SPONSOR Turbosport Subscriber
    Turbosport Moderator
    Turbosport Administrator
    Graham's Avatar
    My Race Car
    My 1st Project
    Join Date
    Feb 2006
    Location
    Ely, Cambs
    Age
    56
    Posts
    25,110
    Thanks
    310
    Thanked 2,476 Times in 2,250 Posts

    Re: 1600 Kent engine + A6 cam + EFI

    another way to look at it is that its actually making the power lower down the rev range than expected. either way the engine is clearly working well.

    i would say the compression is a little on the conservative side given the cam, but it may be that you dont have very good fuel available.

    it would probably also benefit from a set of high lift rockers

  3. #3
    Bodger wxneypar's Avatar

    Join Date
    Mar 2011
    Location
    Montevideo, Uruguay
    Age
    35
    Posts
    110
    Thanks
    10
    Thanked 6 Times in 5 Posts

    Re: 1600 Kent engine + A6 cam + EFI

    I agree on the CR, while I was writing the post I thought the same.
    We use flat top pistons with flat top heads as those are easier to source here because there's a huge market of racing parts for VW.
    The thinner head gasket we can find here is the Ajusa 1mm one, maybe there's something thinner from for example Burton Power that can be shipped to Uruguay and go for 11:1 CR.
    High lift rockers from what I've seen are around GBP 600, + postage + 60% import taxes (yeah 60) are out of budget unfortunately.

    The cam is set at 106 degrees as per the book, do you think we can see a benefit of playing a little bit with cam timing?

  4. #4
    TURBOSPORT SPONSOR Turbosport Subscriber
    Turbosport Moderator
    Turbosport Administrator
    Graham's Avatar
    My Race Car
    My 1st Project
    Join Date
    Feb 2006
    Location
    Ely, Cambs
    Age
    56
    Posts
    25,110
    Thanks
    310
    Thanked 2,476 Times in 2,250 Posts

    Re: 1600 Kent engine + A6 cam + EFI

    might be worth trying to advance the cam timing a bit, you wont know until you try.

    wow on the rocker price, A6 is a very old old grind and a bit short on lift so an alternative to high lift rockers could be a 254 or 264 cam

  5. #5
    Bodger wxneypar's Avatar

    Join Date
    Mar 2011
    Location
    Montevideo, Uruguay
    Age
    35
    Posts
    110
    Thanks
    10
    Thanked 6 Times in 5 Posts

    Re: 1600 Kent engine + A6 cam + EFI

    Thank you, I'm really tempted to try modifying the cam timing.

    On that front, let's say the cam is timed at 106 degrees, so advancing it 2 degrees would be timing it at 104, right? That would move the power band down in the RPM band if I'm not mistaken.
    If all of that is true and I'm not talking nonsense here, what we "need" is retarding it a couple of degrees (eg: 108deg ATDC) to move the power band up.

    Am I correct?

  6. #6
    TURBOSPORT SPONSOR Turbosport Subscriber
    Turbosport Moderator
    Turbosport Administrator
    Graham's Avatar
    My Race Car
    My 1st Project
    Join Date
    Feb 2006
    Location
    Ely, Cambs
    Age
    56
    Posts
    25,110
    Thanks
    310
    Thanked 2,476 Times in 2,250 Posts

    Re: 1600 Kent engine + A6 cam + EFI

    correct. 104,

    my experience with cam timing is you need to try it and see, you cant apply a simple advance/retard rule to it

  7. #7
    Racer Decade Plus User

    Join Date
    Mar 2012
    Location
    Belgium
    Age
    56
    Posts
    2,118
    Thanks
    7
    Thanked 197 Times in 169 Posts

    Re: 1600 Kent engine + A6 cam + EFI

    Quote Originally Posted by Graham View Post
    correct. 104,

    my experience with cam timing is you need to try it and see, you cant apply a simple advance/retard rule to it
    Correct, like long trumpets make more torque and short more power. Most often it is opposite. Pinto's always seems to make more power with trumpets which are longer as can be fitted in an Escort.

+ Reply to Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts