Piston size

[Agent47]

So, before i go ahead with my 1341 build, does anyone know the specs for pistons in a 1w build?

[ereeiz]

Someone on here has had one for sale for a long time, can't remember who now, all I know is they're 1500cc or thereabouts. Tried ETKA then googling part numbers?

[Agent47]

I did ask him, but it's been built up now so presume he couldn't find out. I guess i could pull the ones out of my 1w head and measure them? The diameter isn't a problem, think the height is the crucial difference between those and standard g40 ones.

[polo classic]

Accralite used to specify compression height on their website for the 77mm "1W" G40 pistons

I just got me some custom JE-Pistons, 8.5:1 CR with 77 mm bore

found some info in an old spread sheet

Part No:   1245xx77 Make:   VW Model:   G40 Supercharged Bore size (dia mm):   77 Comp height (mm):   38 Intruder (height mm):    Bowl (depth mm):   7 Pin size (dia mm):   20 Crown thickness:   6 Accralite Ring Part No:   a77000/15-15-25 Pin Part No:   5071 Distance between bosses:   As forged Piston weight (bare):

[polo classic]

PLEASE ENTER THE BORE DIAMETER IN MILLIMETRES   77
PLEASE ENTER THE STROKE IN MILLIMETRES   79.1
PLEASE ENTER THE NUMBER OF CYLINDERS   4
PLEASE ENTER THE HEAD GASKET & SQUISH ALLOWANCE (MM)   1.4
PLEASE ENTER THE VOLUME OF CYLINDER HEAD (IN C.Cs)   0
PLEASE ENTER THE COMPRESSION RATIO REQUIRED (??) TO 1   9
SWEPT VOLUME PER CYLINDER (IN C.Cs)   368.34
ENGINE CAPACITY (IN C.Cs)   1473.36
EFFECTIVE VOLUME OF HEAD GASKET & SQUISH (C.Cs)   6.52
COMPRESSED VOLUME REQUIRED PER CYLINDER   46.04
VOLUME REQUIRED PER PISTON ~ BOWL VOLUME   39.52

[ereeiz]

Here's an old for sale post containing a load of 1W info;

https://www.polog40.co.uk/forum/index.php?topic=2290.0

[ereeiz]

Here's a link to Wikipedia with information; (search the page for 1w to jump straight to it)

engine configuration & engine displacement
inline four-cylinder (R4/I4) diesel engine; 1,391 cubic centimetres (84.9 cu in); bore/stroke 75 / 78.7 mm, 347.75 cc per cylinder, compression ratio: 22.3:1

https://en.wikipedia.org/wiki/List_of_discontinued_Volkswagen_Group_diesel_engines