gti cam in a xu5
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  1. #1
    1000+ Posts djvu205's Avatar
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    Default gti cam in a xu5

    im towards the end of building a xu5 motor to freshen up the si a bit. i know it may have been asked before but cant seem to find much on it.

    Just wondering if it would be ok to run a std s2 gti xu9 cam in it to give it a little more poke, rather than the std si cam, without to much trouble?

    its had 1.5mm off the head new guides 3 angle valve seat etc with std bottom end. i did the calcs a while ago now but hoping to go from 8.95 to around 10.4 ish? i will be using a baker adj cam gear and filing out the mount so it all sits back together and i can get it tuned up right. its only a daily drive that i want to have some fun in while i fix up something else.

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  2. #2
    1000+ Posts PeterT's Avatar
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    I don't think the S1/S2 GTi cam (DFZ) is that much different from the Si cam. You should be looking for a S3 cam.

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  3. #3
    1000+ Posts djvu205's Avatar
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    Default cams

    peter i do have another cam the spec sheet says it is 280 degrees has around 11.9mm lift. timing 30/70 70/30. lift at top dead centre is 2mm.

    would that spice things up a bit with out going to crazy? i plan on running a carby/ carbies if std si injection isnt up to the task.

  4. #4
    1000+ Posts PeterT's Avatar
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    If you've got >10:1 then definitely use the 280 cam. With only 2mm (0.079") lift @ TDC it's still quite acceptable for road use. The Si manifold and TB will strangle it.

    '92 205 Mi16
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  5. #5
    1000+ Posts djvu205's Avatar
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    Default cam

    thanks peter will do. i am going to experiment with a cut down si manifold that is opened up in the throat area where the carby bolts on. i have made a base plate to suit a 32/36 cortina carby. failing that im building a twin weber manifold which is a bit off being finished yet i have only made a model to check for size and clearance etc. i only have twin 40mm dellortos not webers but was assured from my carby guy he can tune them ok.
    Last edited by djvu205; 12th April 2011 at 09:59 PM.

  6. #6
    1000+ Posts alan moore's Avatar
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    Quote Originally Posted by djvu205 View Post
    i only have twin 40mm dellortos not webers but was assured from my carby guy he can tune them ok.
    Nothing wrong with Dellortos over Webers. Just a bit more parts availability from more places with the Webers. 40s with 34mm venturis would be a start for your motor with mods. 34s are the biggest you should fit to a 40, and were the biggest Weber sold for theirs.
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  7. #7
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    Quote Originally Posted by PeterT View Post
    I don't think the S1/S2 GTi cam (DFZ) is that much different from the Si cam. You should be looking for a S3 cam.
    Si 370 thou lift, DFz 400.
    Graham

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