Author Topic: Piston size  (Read 262 times)

Offline Agent47

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Piston size
« on: April 21, 2018, 09:25:57 pm »
So, before i go ahead with my 1341 build, does anyone know the specs for pistons in a 1w build?

Offline ereeiz

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Re: Piston size
« Reply #1 on: April 22, 2018, 09:14:23 am »
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?

Offline Agent47

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Re: Piston size
« Reply #2 on: April 23, 2018, 06:13:48 pm »
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.

Offline polo classic

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Re: Piston size
« Reply #3 on: April 24, 2018, 12:23:51 pm »
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):   
   
« Last Edit: April 24, 2018, 12:29:33 pm by polo classic »

Offline polo classic

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Re: Piston size
« Reply #4 on: April 24, 2018, 12:31:11 pm »
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

Offline ereeiz

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Re: Piston size
« Reply #5 on: April 25, 2018, 10:55:02 am »
Here's an old for sale post containing a load of 1W info;

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

Offline ereeiz

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Re: Piston size
« Reply #6 on: April 25, 2018, 10:56:24 am »
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