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Thread: THOR high comp 4.6 camshaft

  1. #1
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    THOR high comp 4.6 camshaft

    hi guys,

    are there any comments regarding choice of cam for a 9.37:1 4.6 thor engine with vapour injection LPG? mine could do with replacement and it may as well be as worthwhile as it can be.

    i'm more interested in low/mid torque and economy. without a change to injection (which i'm not interested in undertaking), is anything but the stock cam even worthwhile?

    lots of info about early cars and gems but not so much thor

    thanks!

  2. #2
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    "How long since you've visited The Good Oil?"

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  3. #3
    TheTree is offline ChatterBox Silver Subscriber
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    MY96 4.6 HSE P38. Niagara Grey; "The Phoenix"
    MY99 4.6 HSE P38. LPG, Blenheim Sliver; "Voldemort" burnt to a cinder
    MY79 RR Classic, Gone, MY57 Series 1 SWB, Long gone
    P38 write ups and info on my website http://p38.hts.com.au/

  4. #4
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    I have a Crow Cam - they make two versions for the 4.0/4.6 - Crow Cams - the most advanced cam development and CNC grinding facilities in Australia .

    4.6 Cams.jpg
    REMLR 243

    2007 Range Rover Sport TDV6
    1977 FC 101
    1973 Haflinger AP700
    1971 Jaguar V12 E-Type Series 3 Roadster
    1957 Series 1 88"
    1957 Series 1 88" Station Wagon

    [SIGPIC][/SIGPIC]

  5. #5
    TheTree is offline ChatterBox Silver Subscriber
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    Quote Originally Posted by garrycol View Post
    Hi

    Did you fit the HT969-16 lifters as well?

    I am thinking of replacing my cam when I do my lifters and pushrods

    Stev
    MY96 4.6 HSE P38. Niagara Grey; "The Phoenix"
    MY99 4.6 HSE P38. LPG, Blenheim Sliver; "Voldemort" burnt to a cinder
    MY79 RR Classic, Gone, MY57 Series 1 SWB, Long gone
    P38 write ups and info on my website http://p38.hts.com.au/

  6. #6
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    thanks for the responses

    Pedro, is this what you've used? is other machining required (guide height etc) in addition to new valve springs?

    Steve, are they suitable for use in a serpentine belt engine?

    Garry, which one have you got? the car will mostly be normal driving, occasionally some sand or towing work, but mostly road stuff.

    has anyone any experience with the Dynotec 216 which is what i think TRS supply?

    such a confusing and difficult to quantify topic given that there are so many variables - stock cam gears, degreed crank gear. compression ratios, etc.

  7. #7
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    Quote Originally Posted by TheTree View Post
    Hi

    Did you fit the HT969-16 lifters as well?

    I am thinking of replacing my cam when I do my lifters and pushrods

    Stev
    No - my engine is standard so stayed with standard pushrods and (new) lifters.
    REMLR 243

    2007 Range Rover Sport TDV6
    1977 FC 101
    1973 Haflinger AP700
    1971 Jaguar V12 E-Type Series 3 Roadster
    1957 Series 1 88"
    1957 Series 1 88" Station Wagon

    [SIGPIC][/SIGPIC]

  8. #8
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    Quote Originally Posted by mpwdhc View Post
    Garry, which one have you got? the car will mostly be normal driving, occasionally some sand or towing work, but mostly road stuff.
    I went for the 371771 but my engine is not in a D2 or P38. It is going in my 101 which is low geared - so at low speed etc the gearing provides plenty of power but I cruise on the highway at around 3000 rpm where torque on a standard RV8 starts to drop off so I wanted more torque higher up the rev range.

    That is probably not needed in a P38 but I am not sure - the chart I put up has the rev range for each cam where you can expect best performance so you need to select what suits best - at my 100kph the same revs probably are giving you 160kph so different requirements.

    Garry
    REMLR 243

    2007 Range Rover Sport TDV6
    1977 FC 101
    1973 Haflinger AP700
    1971 Jaguar V12 E-Type Series 3 Roadster
    1957 Series 1 88"
    1957 Series 1 88" Station Wagon

    [SIGPIC][/SIGPIC]

  9. #9
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    26,727
    Yes,, on Turners reccomendation. Very happy so far, but the Tornado ECM makes a bigger difference....
    "How long since you've visited The Good Oil?"

    Live simply.
    Love generously.
    Care deeply.
    Speak kindly.


    '93 V8
    Rossi
    '97 to '07. sold.
    '01 V8 D2
    '06 to 10. written off.
    '03 4.6 V8 HSE D2a with Tornado ECM
    '10 to ???
    Its a gas gas gas Tug?
    Making Lemonade since 2016.


    Golf GTX Tourer MKIII 19' of Heaven


  10. #10
    Join Date
    Jan 2016
    Location
    Netherlands
    Posts
    220
    I should think that as far as cams are concerned the gems and thor are the same? In any case in my gems I have a piper285 and a tornado chip. afaik it should fit the thor as well. More mid torque and more high end power. The only real downside is a slightly rougher idle, but since the P38 is an auto box, you won't notice it unless the engine runs in park or neutral (unloaded)

    I have a chart at home with everything that was changed on my engine but afaik you can run this without modifying anything else though port and polish of the heads is recommended.

    -P

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