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Old 11-16-2003, 03:09   #1 (permalink)
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BA XR6 Pistons

Just got me thinking, not that I am pondering this but i'm sure that there will be some sick minded people that might. But here goes:

How compatible with the Petrol engine are the LPG high lift pistons? Standard XR6 (BA182) engines come with pistons offering 9.7:1 (or is it 9.5, i can't quite remember). Anyway, the LPG unit comes with 10.7:1 and the XR6T comes with 8.7:1.

Naturally upgrading to a 10.7:1 ratio would require premium (95RON+) fuel, but are they likely to be different in any other way (different material etc) due to being for the LPG E-Gas engines?

What sort of performance increase would this see (speculations please) and why couldn't it be done?

Also what the hell units are those ratios in... Is that like 10.7 atmospheres of pressure if ambient is 1 atmosphere? or something else?
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AU II XR6 - October 2001 ~ December 2002 - RIP
BA XR6 - December 2002 ~ Soon to disappear if Ford CRC can't fix it....

45,000km service coming up - and i'll be asking for a sizable list of fixes:
* Gearbox (3rd time)
* Steering click (5th time)
* Brake Shudder (2nd time, and has the applied "Fix")
* etc...
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Old 11-16-2003, 21:42   #2 (permalink)
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Re: BA XR6 Pistons

It is the ratio of volume of the cylinder at BDC vs volume at TDC. Ratios don't need units...I think u'd be hard pressed to find a ratio that needed a unit.
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Old 11-17-2003, 14:20   #3 (permalink)
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Re: BA XR6 Pistons

Quote:
Originally Posted by madmelon
It is the ratio of volume of the cylinder at BDC vs volume at TDC. Ratios don't need units...I think u'd be hard pressed to find a ratio that needed a unit.

Ahh very true :) Good explanation too :)

And here I was thinking it was something exotic like atmospheres of pressure given ambient of 1 atmosphere

Learn something everyday.... ANyway does anyone think this modification is possible? viable?
__________________
Falcon Killer (if you believe what Ford Service Departments have to say about me)
AU II XR6 - October 2001 ~ December 2002 - RIP
BA XR6 - December 2002 ~ Soon to disappear if Ford CRC can't fix it....

45,000km service coming up - and i'll be asking for a sizable list of fixes:
* Gearbox (3rd time)
* Steering click (5th time)
* Brake Shudder (2nd time, and has the applied "Fix")
* etc...
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Old 11-18-2003, 23:32   #4 (permalink)
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Re: BA XR6 Pistons

I think ford should do this to the NA XR6 from the factory, requires PULP
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