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johnrg

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Member #: 7788
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bradford west yorkshire

20th Jan, 2010 at 08:23:56pm

how is c.r calculated my c.r on my car is 9.4-1 so if i had my chambers enlarged to 27cc what does that make my new c.r and would it be lowerd enough to add a turbo to it anyony ????

johnrg

88 Posts
Member #: 7788
Advanced Member

bradford west yorkshire

20th Jan, 2010 at 08:24:39pm

anyone???

wil_h

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9258 Posts
Member #: 123
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Betwix Harrogate and York

20th Jan, 2010 at 08:36:40pm

No answer after 43 seconds, come-on give us a chance.

Google CR there's lots of on-line calculators.

Presuming you have the standard chambers now (21.4cc) and as 9.4: will be fine for 10 or 12psi then a rough finger in the air would suggest that the 27cc chambers would allow 15+psi.

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.


Joe C

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12307 Posts
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Carlos Fandango

Burnham-on-Crouch, Essex

20th Jan, 2010 at 08:40:17pm

it is the ratio of the combustion space to the swept area plus combustion space of one cylinder,

so... if you have a 1000cc 4 cyl engine one cylinder will be 250cc, if that cylinder has 25cc space at TDC then the compression ratio will be 11 to 1

to calculate it take the swept area (250cc) ad it to the combustion space (25cc) and divide it by the combustion space (25cc) 250+25 (=275)/25= 11.... easy(second time round....)!

or stuff some figures in this *wink*

http://www.afracing.com/CR.xls

edited to be right....

Edited by Joe C on 20th Jan, 2010.

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/



Sprocket

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11046 Posts
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Preston On The Brook

20th Jan, 2010 at 08:45:11pm

not quite, its swept volume plus unswept volume divided by unswept volume

On 26th Oct, 2004 TurboDave16v said:
 Is it A-Series only? I think it should be...
So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'...


On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........

Joe C

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12307 Posts
Member #: 565
Carlos Fandango

Burnham-on-Crouch, Essex

20th Jan, 2010 at 08:47:25pm

bollocks....

hurry's to check own spreadsheet...

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/



johnrg

88 Posts
Member #: 7788
Advanced Member

bradford west yorkshire

20th Jan, 2010 at 09:17:37pm

wil h i corrected my spelling after 43 seconds fron anyony to anyone lol i got all the time in the world m8
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