Basic 16v head porting

Discussion in 'JMRacing' started by mr hillclimber, May 5, 2011.

  1. R.b!n_16v Forum Member

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    I'd read on youre website that there is a big valve 16v head is coming. How much mm valves are we thinking of 34inlets?

    grtz
     
  2. mr hillclimber Club GTI Supporter and Sponsor

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    There is indeed... Poss something like that..33 or 34...though I may try a 32.5 on the std seat to keep the end cost down..time will tell.
     
  3. possle Forum Member

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    in fitting bigger valves, will even more work have to be done to valve throat area to achieve a better gain?
    how much throat work can actually be done? this were cutaway pics come in?
     
  4. milesmk2 Forum Member

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    Took my head to a place in Bristol today, took the valves with me, said what id like done and i was given the reply "OK, leave it with us i'll cut the seats, grind the valves, blend the sharp edges, re-seat all the valves and pressure test it for you."

    Marvelous.
     
  5. mr hillclimber Club GTI Supporter and Sponsor

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    Yes it will indeed. It wont be a massive amount, particularly with just 0.5 bigger valves. .Then obviously a bit more again with 1mm bigger.

    There's still scope for more...the throats on the high flow 16v's I do are a decent size already.
     
  6. R.b!n_16v Forum Member

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    Are you going to make the valves yourself? cause i never seen bigger 16v vw valves for sale.
     
  7. mr hillclimber Club GTI Supporter and Sponsor

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    Ah good...pics when you get it back then.
     
  8. milesmk2 Forum Member

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    Will do!

    Ive got a tree shaped burr infront of my and am waiting for a ball end (i said ball) one in the post. A friend has a dye grinder i can use so all i need to know now is where to cut out what.
     
  9. possle Forum Member

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    so working the throat/bowl just means making the area behind the valve that little bit bigger? or bigger and shaped to give more flow?
     
  10. mr hillclimber Club GTI Supporter and Sponsor

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    No not my own. Supertech in America do them..tho I'll prob try another source in the UK first.
     
  11. mr hillclimber Club GTI Supporter and Sponsor

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    Ah good. A tree wont be much use, you'll need an oval and a straight with a rounded end..but the ball will be handy...depends what work you want to do.

    Get it back first and we can take a look from there.
     
  12. mr hillclimber Club GTI Supporter and Sponsor

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    A bit of both...everything goes a touch bigger.
     
  13. milesmk2 Forum Member

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    Right ok.

    Any chance of afew links to places that do the burrs you've mentioned?
     
  14. mr hillclimber Club GTI Supporter and Sponsor

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    Try J&L and I think SGS.

    Roebuck do them as well...that's what some of mine are.
     
  15. milesmk2 Forum Member

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    This is the one ive got

    [​IMG]

    According to the roebuck site its an oval, but the people in the tool shop said its a tree.

    Can you clarify?
     
  16. possle Forum Member

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    my local mac tools man had a die grinder and 4 burr set on offer recently, 94 dont know how that compare to others as i tend to stick with him for my tools.
    thanks hillclimber
     
  17. milesmk2 Forum Member

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    Thats pretty good pricing!

    That burr in the pic cost me 15 on its own, and the dye grinder i was looking at was 100.

    Beware of cheap tools though, they will be cack.
     
  18. possle Forum Member

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    thats my thinking. mac burrs are lifetime garantee which is massive bonus as i do alot of de liping steel brake drums. no problems replaced as soon as they wear. great service, probs cus of how much ive spent!
     
  19. milesmk2 Forum Member

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    Good point that. We use Roebuck stuff in work (Corus, or Tata) and its awsome stuff!
     
  20. mr hillclimber Club GTI Supporter and Sponsor

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    Have you ever seen a tree that shape? !

    That's not the proper oval but its ok..

    I'll dig out the part numbers I have.
     

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