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Author Topic: HX25 on a aaz ?  (Read 6860 times)

Reply #15April 07, 2011, 05:50:51 am

davidskipper123

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Re: HX25 on a aaz ?
« Reply #15 on: April 07, 2011, 05:50:51 am »
and by optomising im assuming you mean a port and polish ?
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Reply #16April 07, 2011, 05:52:33 am

Alcaid

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Re: HX25 on a aaz ?
« Reply #16 on: April 07, 2011, 05:52:33 am »
Yes, bigger valves wouldn't hurt either :)
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'03 VW Golf PD130 4Motion Highline
'10 VW Passat 1.6TDI Highline
'83 VW Jetta 1.6TD, 11mm pump, H-beam rods, girdle, fully reworked AAZ head +++ Going Compound ;)
Reply #17April 07, 2011, 06:04:57 am

davidskipper123

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Re: HX25 on a aaz ?
« Reply #17 on: April 07, 2011, 06:04:57 am »
thats gonna be alot more than my budget can allow me thinks how much bigger we talking what are standard sizes ?
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Reply #18April 07, 2011, 06:15:45 am

Alcaid

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Re: HX25 on a aaz ?
« Reply #18 on: April 07, 2011, 06:15:45 am »
The earlier AAZ heads has 8mm valve stems:
Intake: 36.0mm x 8mm x 95.6mm
Exhaust: 31.2mm x 8mm x 95.6mm

Later on they moved over to the 7mm stem size:
Intake: 36.0mm x 7mm x 95.6mm
Exhaust: 31.0mm x 7mm x 95.6mm

Something like 37mm intake and 33mm exhaust would be nice: http://performance-diesel.com/index.php?main_page=product_info&cPath=2_1&products_id=3 (made for VE TDI, so slightly longer (1.3mm) but would be perfect for a IDI application with a reground camshaft)
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'03 VW Golf PD130 4Motion Highline
'10 VW Passat 1.6TDI Highline
'83 VW Jetta 1.6TD, 11mm pump, H-beam rods, girdle, fully reworked AAZ head +++ Going Compound ;)
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