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Home > General Chat > Piston id

Scudy23

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236 Posts
Member #: 10087
Senior Member

Very wet south wales

1st Oct, 2012 at 04:39:36pm

Wondering if someone could id these for me please, i bought them cos i was told they are 998 +0.20 which it states but are they ok to go in a turbo build ?


wil_h

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9258 Posts
Member #: 123
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Betwix Harrogate and York

1st Oct, 2012 at 05:43:19pm

hard to tell from that photo. need a side shot.

But counting the rings and looking at the skirt length, I'd guess they were 20773s. Ok for 10psi.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph



On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


Scudy23

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236 Posts
Member #: 10087
Senior Member

Very wet south wales

1st Oct, 2012 at 06:04:54pm

They would be better than the flat tops tho ? How would i work out the compression ratio


Scudy23

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236 Posts
Member #: 10087
Senior Member

Very wet south wales

1st Oct, 2012 at 08:23:53pm

Took a few more pics to help pin point these but inside is stamped 20773




wil_h

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9258 Posts
Member #: 123
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Betwix Harrogate and York

1st Oct, 2012 at 08:51:34pm

ha, I'm king of the piston identifiers. Even say 20773 inside them.

As above, ok for 10psi, I ran them at 15psi wit hno issues (assuming fuelling and ignition was ll ok). They have a 6cc dish, so you don't need massive chambers, 24cc should give you 8.5:1.

If you are to use them you'll need to fit buttons rather than the circlips as these are the main point of failure.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph



On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


Scudy23

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236 Posts
Member #: 10087
Senior Member

Very wet south wales

1st Oct, 2012 at 10:27:47pm

Nice one wil

The plan is these with a 12g295 head ( slightly ported ) metro cam, glad they will do the job cos they only cost me £40 but i will replace the rings just incase.
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