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Home > 998cc > The TTs CR

wil_h

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9258 Posts
Member #: 123
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Betwix Harrogate and York

27th Jan, 2006 at 07:42:03pm

For years I've been telling everybody that the TT had a CR of 7.3ish:1. I got this figure from the guy who originally did the head (Jonspeed wankers) and never questioned it.

I assumed that as we ran 18psi no probs it probably was that low.

But as we are having a new head for the TT2 I decided that it's best to know what we had so we can make the righ chamges.

Turns out that the chamber size is around 25cc, giving us more like 8.2:1ish.

we'll be keeping it prety similar for the TT2, maybe up a bit. At 8.5 we should easy run 18psi anyhoo.

wil

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

www.twin-turbo.co.uk

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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