XJ6 & XJ12 Series I, II & III 1968-1992
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What octane are you guys running??

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  #21  
Old 01-11-2017, 06:28 AM
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Originally Posted by hooter
mine runs 98, i was told the 86 series3 were a slightly higher compression ratio but i dont know how true that is,

High or low compression is market dependent, not year dependent.

USA (possibly all North American?) market cars got the lower compression. As far as I know all other markets got the higher compression.

The low compression was 8.0 to 1 or 7.8 to 1 depending which spec sheet you at reading at the moment

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DD
 

Last edited by Doug; 01-11-2017 at 12:04 PM.
  #22  
Old 01-11-2017, 10:21 AM
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What octane is required for cars outside North America or is marketed using a different rating scale (RON vs. AKI) just serves to confuse the OP's question.
 

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