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| JoeXR6 |
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Age: 43 Posts: 387 Joined: 30th Nov 2007 Ride: AU111 XR6 VCT Supercharged Location: Brisbane |
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.
_________________ 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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| EBXR8380 |
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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 ...
_________________ As in ZOOM 126 edition |
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| JoeXR6 |
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Age: 43 Posts: 387 Joined: 30th Nov 2007 Ride: AU111 XR6 VCT Supercharged Location: Brisbane |
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?
_________________ 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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| EBXR8380 |
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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...
_________________ As in ZOOM 126 edition |
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| JoeXR6 |
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Age: 43 Posts: 387 Joined: 30th Nov 2007 Ride: AU111 XR6 VCT Supercharged Location: Brisbane |
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.
_________________ 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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| JoeXR6 |
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Age: 43 Posts: 387 Joined: 30th Nov 2007 Ride: AU111 XR6 VCT Supercharged Location: Brisbane |
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.
_________________ 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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| ebs_4l |
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sounds about right
_________________ EB 4L, 8.4:1, R154, GT4202r, 4in exhaust, Greenslade Engineering exhaust manifold, plenum chamber, 90mm throttle, Garrett W2A cooler, Surecam custom, autronic SM4, Bosch 120lb, Crane HI-6, LX-92, LM-1, Turbosmart Reg, 2x bosch 044, turbosmart 48 gate. 470kw+ @ 18PSI |
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