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New Compression Ratio? 

 

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 Post subject: New Compression Ratio?
Posted: Mon Apr 28, 2008 12:48 am 
Tyre Shredder
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Ride: AU111 XR6 VCT Supercharged

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Hi All, I'm wondering what my compression ratio would be with a 1.6mm gasket (copper) fitted.

The AU standard is 9.6:1....is there a formula to work out what the new lowered compression ratio would be? Just a question out of interest.

 

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Posted: Mon Apr 28, 2008 12:21 pm 
Getting Side Ways
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You have to know a few things like head CC . Deck height of piston, any dish etc in piston..
Bore and stroke ...
http://www.turbofast.com.au/TFcomp.html
This is static comp which is different to dynamic..
Static comp never changes ...

 

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Posted: Mon Apr 28, 2008 1:37 pm 
Tyre Shredder
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Ride: AU111 XR6 VCT Supercharged

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Wow that's an awesome calculator. I can find bore, stroke, gasket thickness and compression ratio, but wouldn't know how to find deck height or head volume. Any ideas where I 'd gather this info?

 

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FOR SALE! - Supercharged AUIII XR6 VCT, intercooled, T5, big brakes.... details in the 'For Sale' section - ford-parts-for-sale-f17/fs-supercharged-au-xr6-vct-series-iii-intercooled-rwc-rego-t114254.html

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Posted: Tue Apr 29, 2008 2:37 am 
Getting Side Ways
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BEFORE fitting your head you should have cc'd the chambers and if any piston bowl ? That too..
Also should have checked deck height..
Or its almost guess work working what manuals say.. A rough way is you know or have been told its 9.6 comp...Then play with figures on there till you get that. Then add the thickness of new gasket...

 

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331 Dart block,3.25/ 4340 steel crank, Oliver rods,TFS ported track heat heads, TFS track heat inlet Twin SC61 turbo's
Project 1UZ-EF has started.. S475 Turbo 4.0 V8 Mustang Celica.....

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Posted: Tue Apr 29, 2008 7:13 pm 
Tyre Shredder
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Ride: AU111 XR6 VCT Supercharged

Location: Brisbane
QLD, Australia

I didn't fit the head, but that sounds like a good rough way to get an estimate. I'll give it a go - Cheers.

 

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FOR SALE! - Supercharged AUIII XR6 VCT, intercooled, T5, big brakes.... details in the 'For Sale' section - ford-parts-for-sale-f17/fs-supercharged-au-xr6-vct-series-iii-intercooled-rwc-rego-t114254.html

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Posted: Wed Apr 30, 2008 5:03 pm 
Tyre Shredder
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Ride: AU111 XR6 VCT Supercharged

Location: Brisbane
QLD, Australia

Ok, I think the XR6 head volume is 66cc, bore is 93mm, stroke 99mm, and with deck height set at .030 thousandths of an inch, I got around 9.6:1 compression ratio with a standard (.040 thousand of inch) gasket.

Did some mm to inch conversions, changed to my 1.6mm gasket, and compression came down to 9.19:1. Does that sound about right? Excellent calculation tool.

 

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FOR SALE! - Supercharged AUIII XR6 VCT, intercooled, T5, big brakes.... details in the 'For Sale' section - ford-parts-for-sale-f17/fs-supercharged-au-xr6-vct-series-iii-intercooled-rwc-rego-t114254.html

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Posted: Wed Apr 30, 2008 9:14 pm 
Getting Side Ways
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sounds about right

 

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