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Thread: High compression 4.6

  1. 10th May 2016, 08:46 PM #1
    redandy3575
    redandy3575 is offline Master
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    High compression 4.6

    Just out of curiosity, can a high comp 4.6 V8 run on standard 91 octane unleaded comfortably without causing damage?
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  2. 11th May 2016, 07:53 AM #2
    Battler
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    If it's standard it should be fine.
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  3. 15th May 2016, 07:51 AM #3
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    davidsonsm
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    Just read this. The engine that was built aimed for 10.2:1. I'd be sticking to a min of 95RON.

    http://www.carbibles.com/fuel_engine_bible_pg3.html
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  4. 15th May 2016, 08:55 AM #4
    Battler
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    [QUOTE=davidsonsm;2532927]Just read this. The engine that was built aimed for 10.2:1. I'd be sticking to a min of 95RON.

    I thought the 4.6 HC was 9.35:1
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  5. 15th May 2016, 09:09 AM #5
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    mtb_gary
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    Quote Originally Posted by davidsonsm View Post
    Just read this. The engine that was built aimed for 10.2:1. I'd be sticking to a min of 95RON.

    Car Bibles : The Fuel and Engine
    Thanks for for the link Sean, a long but detailed article that was not just techno babble.
    Gary

    2007 Range Rover Sport TDV8

    Modified 1996 p38a HSE sold
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  6. 15th May 2016, 07:39 PM #6
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    davidsonsm
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    [quote=Battler;2532948]
    Quote Originally Posted by davidsonsm View Post
    Just read this. The engine that was built aimed for 10.2:1. I'd be sticking to a min of 95RON.

    I thought the 4.6 HC was 9.35:1
    I was referring to the engine in red andy's new p38, which he bought off me. I'd had a new engine built for it when it was under my ownership.
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  7. 15th May 2016, 08:35 PM #7
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    Pedro_The_Swift
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    How did you actually aim it at 10.2?
    "How long since you've visited The Good Oil?"

    '93 V8 Rossi
    '97 to '07. sold.
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    Home is where you park it..

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  8. 15th May 2016, 08:43 PM #8
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    davidsonsm
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    Quote Originally Posted by Pedro_The_Swift View Post
    How did you actually aim it at 10.2?
    By skimming the HC pistons along with decking. Done by orger engines.
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  9. 16th May 2016, 09:07 AM #9
    TheTree
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    I noticed the owners manual said 95 RON for the HC engines
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  10. 16th May 2016, 10:18 PM #10
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    banarcus
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    The occasional use of 91 wont hurt it. Knock sensors take some of the timing out of it so all you lose is power.
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