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Thread: '78 GLS rebuild

  1. #11
    Join Date
    Feb 2013
    Location
    Melbourne SE
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    347
    Users Country Flag

    Quote Originally Posted by sports racer View Post
    Isn't the AAD motor normally an 8v? I thought you couldn't fit a 16v head to any 8v block?

    I've got KR, 9a and a ABF head but all 3 blocks need a rebore and new pistons. If I can fit the 9a or ABF head to an AAD motor it would make things much simpler.
    I know it is possible to fit a 20v head to an 8v block by blocking some oil returns and enlarging another.

    I presume the same would be possible if the 16v engines had the same cylinder spacing and head bolt locations. Just put one on a 8v block and it should become clear what needs to happen
    77 Mk1 GLS 2 door - That sinking feeling
    76 Mk1 Swallowtail 2 door - Replace that BMW & 76 Sweetheart

  2. #12
    Join Date
    Jun 2006
    Location
    Orange NSW
    Posts
    402
    The AAD is an 8v tall block found in audi a4's. Same as 16v ABF blocks, with piston squirters etc 82.5mm bore 92.8mm stroke. No need to block any oil return ports just a straight bolt on for 16v heads. You need new pistons unless you want 8.0:1 compression ratio.

    Mk2 GTI 2 door 1.9l 8v turbo 1st mk2 1st engineered water vw nats 09
    Mk1 twin eng twin turb
    scirocco gti 2.1l 16v turb 6spd
    Audi A4 B5 1.8t

  3. #13
    Join Date
    Jul 2008
    Location
    Braidwood, rural NSW
    Posts
    3,198
    Users Country Flag
    If I need new pistons I'm back at square 1. May as well stick with my 9a and get new pistons for that.

  4. #14
    Join Date
    Mar 2008
    Location
    Wollongong, NSW
    Posts
    68
    Thread Starter
    '78 GLS rebuild-head-2-jpg'78 GLS rebuild-head-jpg Ported and polished, port matched, combustion chambers cc'd, bore matched, oversized 0.5 mm supertech valves inlet and exhaust
    '11 Golf GTI - Tornado Red, 5dr, DSG, 18" Detroit's, ACC, Sunroof, Park Assist, RVC, Tint, Leather, Electronic Seat

    previously: '00 audi a4 turbo quattro avant, '89 audi 90quattro20v, '78 golf 1.8l

  5. #15
    Join Date
    Jul 2008
    Location
    Braidwood, rural NSW
    Posts
    3,198
    Users Country Flag
    So envious!

    When will this be back on the road?

  6. #16
    Join Date
    Mar 2008
    Location
    Wollongong, NSW
    Posts
    68
    Thread Starter
    '78 GLS rebuild-extractors-1-jpg'78 GLS rebuild-extractors-2-jpg Stainless steel 316 flanges and tubing. Titanium thermal wrap. 1.75" primaries 2.3" collector diameter
    '11 Golf GTI - Tornado Red, 5dr, DSG, 18" Detroit's, ACC, Sunroof, Park Assist, RVC, Tint, Leather, Electronic Seat

    previously: '00 audi a4 turbo quattro avant, '89 audi 90quattro20v, '78 golf 1.8l

  7. #17
    Join Date
    Jan 2015
    Location
    Denmark
    Posts
    74
    Great looking headers! Did you make it yourself?

  8. #18
    Join Date
    Jun 2006
    Location
    Orange NSW
    Posts
    402
    I made the headers, they are calculated at 781 mm long along the center line of the tubing from the valve to the spiked merged collector. Using capacity, cam profile and peak power rpm desired to determine the length, tube diameter and collector diameter. The 4 into 1 design is for top end power and i would expect next to no gain over the standard manifold and down pipe below 4000 rpm it flows quite well. The best extractors i have seen tested (tectonics tuning) on an otherwise standard 16v abf gained 7 hp, i would be happy with that. The worst i have seen were ashley 4 into 1 gaining 2hp...

    Mk2 GTI 2 door 1.9l 8v turbo 1st mk2 1st engineered water vw nats 09
    Mk1 twin eng twin turb
    scirocco gti 2.1l 16v turb 6spd
    Audi A4 B5 1.8t

  9. #19
    Join Date
    Mar 2008
    Location
    Wollongong, NSW
    Posts
    68
    Thread Starter
    '78 GLS rebuild-11896955_10203919039491307_1151325767_n-jpg

    Head assembly: super tech valves +0.5mm and springs, titanium retainers and INA light weight lifters
    '11 Golf GTI - Tornado Red, 5dr, DSG, 18" Detroit's, ACC, Sunroof, Park Assist, RVC, Tint, Leather, Electronic Seat

    previously: '00 audi a4 turbo quattro avant, '89 audi 90quattro20v, '78 golf 1.8l

  10. #20
    Join Date
    Mar 2008
    Location
    Wollongong, NSW
    Posts
    68
    Thread Starter

    '78 GLS rebuild-11913033_10203919278177274_1227325148_n-jpg

    Stainless Cylinder head coolant piping
    '11 Golf GTI - Tornado Red, 5dr, DSG, 18" Detroit's, ACC, Sunroof, Park Assist, RVC, Tint, Leather, Electronic Seat

    previously: '00 audi a4 turbo quattro avant, '89 audi 90quattro20v, '78 golf 1.8l

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