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My car is at JBS for a GT3071R fitting.

Discussion in '(Archived) Engine Discussion and Tuning' started by EddyH, May 6, 2006.

  1. EddyH

    EddyH Full Member

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    No worries it's all related and makes interesting reading.
     
  2. Songman

    Songman Full Member

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    Apologies to Eddy - and a big thumbs up too! - can`t wait to see the results - should be fantastic

    The standard pistons/crank are fine for 500 - just the rods are dodgy i`m told - I read that some of the Vortex guys have passed an incredible 700bhp now!!

    Would think that the largeport head is advisable for big power

    [​IMG]

    is anyone doing CNC porting of 1.8T heads in UK? -I know Cosworth are producing CNC jobs for Sub/EVO
     
  3. EddyH

    EddyH Full Member

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    Unfortunately I think it's a bit late to go large port now as my head has already been sent off for matching to the valves, however the inlet valves will be 1mm larger diameter than standard.
     
  4. Songman

    Songman Full Member

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    I`m sure the inlets on a ported smallport head will flow plenty enough - it would be interesting to see the flow data ported smallport/standard largeport

    The theroists always worry more about flow capacity on the exhaust side - port/manifold/turbo/exhaust - any restriction there with big power outputs, and things get `difficult`:cry: - according to the flow data there`s not much difference between the exhaust ports in the two heads
     
  5. ibizacupra

    ibizacupra Jack-RIP my little Friend

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    Are you smallport or largeport Steve?
    Dahlback does'nt port to largeport properly as the runners are very narrow still.
     
  6. caney

    caney Full Member

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    hi bill,mine is still smallport got the mani off edd's sportec golf as he's having a custom one built by them:)
     
    #46 caney, May 21, 2006
    Last edited: May 21, 2006
  7. ryan_s3

    ryan_s3 Full Member

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    Looks good for my up-coming largeport head with those graphs.
     
  8. caney

    caney Full Member

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    so come on then ryan what BIG plans have you got for yours then?or is it all hush hush;)
     
  9. ryan_s3

    ryan_s3 Full Member

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    No big plans steve,thought i told you at pod what i was doing.400bhp max, probably a bit less.
     
  10. caney

    caney Full Member

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    you've already got a bit less! 360bhp:)
     
  11. EddyH

    EddyH Full Member

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    Update:

    The pistons arrived last week, the block was sent off and has been bored out to suit the new pistons.

    Rods arrived this morning.
     
  12. caney

    caney Full Member

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    up and running for gti?
     
  13. EddyH

    EddyH Full Member

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    That's the plan but I think I may struggle to get it sufficiently run in to grace the strip but I'll do my best dependant on when it's finished.

    Here's a photo of one of the 83mm JE pistons which I was sent today:

    [​IMG]
     
  14. Geeba

    Geeba Guest

    Hmmm isnt this the same Edd that said "I like my ko3s and wont go big turbo?" Just gone HUGE everything!
    Look forward to seeing it at the show...
     
  15. EddyH

    EddyH Full Member

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    Yes. :rolleyes:

    Truth is though I'd tried IHI and GT28RS and they weren't for me. However I tried a car with a similar setup to what I'm going for and it just felt right, I knew straight away it was what I wanted for my car.
     
  16. ryan_s3

    ryan_s3 Full Member

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    360bhp at 6100rpm then nosedive,
    this time it will be 400bhp and held......hopefully.
    I'll leave it too you guys for the big numbers!
     
  17. caney

    caney Full Member

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    lovely lovely:p
     
  18. ibizacupra

    ibizacupra Jack-RIP my little Friend

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    5 valve pockets :think:
    some higher lift cams?
    wondering what CR from the crown of the piston.

    shame you cant seem em when they're in the motor.
     
  19. EddyH

    EddyH Full Member

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    The valve pockets also have me a little puzzled as the cams and crank are staying standard.

    I agree it's such a shame that the pistons won't be seen.

    EDIT: The cut outs are for use with high lift cams (which I won't have), the compression ratio is 8.5:1
     
    #59 EddyH, Jun 1, 2006
    Last edited: Jun 1, 2006
  20. ibizacupra

    ibizacupra Jack-RIP my little Friend

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