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71 Posts Member #: 5754 Advanced Member Bridport Dorset |
16th Mar, 2011 at 08:25:41pm
hi has anyone tried useing the shorter 1098cc pistons in a 998 to lower the compresion ratio im on a budget of as little as possible |
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 9258 Posts Member #: 123 Post Whore Betwix Harrogate and York |
16th Mar, 2011 at 10:19:24pm
Not that I know of. But interesting idea. What is the differance in pin height? 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. |
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71 Posts Member #: 5754 Advanced Member Bridport Dorset |
17th Mar, 2011 at 08:01:15am
i know that they will sit 4-5mm lower in the block when at tdc |
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9258 Posts Member #: 123 Post Whore Betwix Harrogate and York |
17th Mar, 2011 at 08:06:18am
You'll have to do some calculations then, 4-5 mm is a lot and you may just end up spending all your money skimming the head and block. 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. |
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Forum Mod  1927 Posts Member #: 1761 Stalker Bristol |
17th Mar, 2011 at 08:55:31am
Or you could find a skimmed 12G295, as most people who do a 998 turbo build look for unskimmed ones which are now getting much harder to find.
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 1137 Posts Member #: 1450 Post Whore Near Paris - France |
17th Mar, 2011 at 09:27:43pm
Aren't there some low comp 998 pistons out there ?
Rusty by nature
On 23rd Jun, 2008 paul wiginton said:
They said "That sounds rough mate." I said "Cheers it cost me a fortune to make it sound like that!" |
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9258 Posts Member #: 123 Post Whore Betwix Harrogate and York |
18th Mar, 2011 at 07:45:20am
Yes, you could use the 20773, it has a 6cc dish. You will need to use buttons on the gudgeon pin though. 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. |
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 8604 Posts Member #: 573 Formerly Axel Podland |
18th Mar, 2011 at 08:20:07am
I'm building a budget 998 Turbo for the re-shelled 30. I'm using a set of +0.020" 20773s and a heavily skimmed large valve 12G295 that I have laying around. 9:1 compression. Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
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