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Sun May 20, 2007
17:40
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This has been a good weekend for tinkering in the garage - it's been lousy
weather:
I spent some time refurbishing a couple of throttle bodies - one of them is for
our A3 Golf:
I've also been practicing polishing valve faces. I'm getting closer to completing
the ABA engine rebuild, so it's time to think about the cylinder head and valvetrain.
Polishing the valve faces helps reduce carbon buildup, and also helps hot spots
from developing (which could lead to detonation problems). I will be polishing
the combustion chambers in the cylinder head as well, for the same reasons. I'll
be having 0.060" milled off the head, and then compensating for the 1.3 degree
cam timing error by using an adjustable cam gear. The final compression ratio
will be 11.5:1 - so I need to do everything I can to promote efficient combustion.
I have a decent technique for polishing the valve faces, which involves glass
bead blasting (to remove carbon buildup) followed by rubbing with crocus cloth
and WD-40, and then using a power drill to spin the valve against a soft cloth
with Brasso metal polish. I haven't been able to get a perfect mirror finish yet,
but I can get them shiny enough to see reflections:
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A1 parts for sale:
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Item: Intake air pre-heat hose (from exhaust manifold shroud to air box), for Scirocco 2 (1982+)
Condition: New
$12
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A2 parts for sale:
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Item: GTI dual-round grille with inner lights, bulbs, and lower trim strip
Condition: Used, lower trim strip is weathered.
$35
Item: Parcel shelf strap, 3 available
Condition: New
$3.50 ea.
Item: 8 (eight) valve guides, German, standard size, for 8 valve head
Condition: New
$24
Item: Wheel cylinder (for rear drums, obviously), 2 available.
Condition: New
$12 ea.
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A3 parts for sale:
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Item: Parcel shelf strap, 3 available
Condition: New
$3.50 ea.
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A4 parts for sale:
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Item: OEM Water pump, ALH engines
Condition: Used, 130,000 miles
$20
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