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Thread: 20v BT head on a 7AGE

  1. #1
    Forum Member 1st year Apprentice
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    Default 20v BT head on a 7AGE

    i currently have a 7AGE 16v with a tvis redtop head (MAP TYPE).

    is there a gain by switching to a BT head?

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    Junior Member Carport Converter Dale's Avatar
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    Default Re: 20v BT head on a 7AGE

    edit: i was horribly wrong
    Last edited by Dale; 27-02-2006 at 05:09 PM.

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    Default Re: 20v BT head on a 7AGE

    Quote Originally Posted by Dale
    AFAIK it simply won't work, at least not without major modifications - feel free to correct me if I'm wrong
    yeah it will work. but i need to know is the swap worth the gain?

  4. #4
    Junior Member Too Much Toyota oldcorollas's Avatar
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    Default Re: 20v BT head on a 7AGE

    there will probably be gains from the smaller ports, but nothing you couldn't get from going to a non-TVIS 16V head perhaps?

    if you want to use the TVIS to broaden powerband tho, then the 20V head is a better idea
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    jzx100 fan boy Domestic Engineer slide86's Avatar
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    Default Re: 20v BT head on a 7AGE

    I have a mate with a 7AGE 20v

    With standard head and rebuilt engine, wolf 3d, exhuast and air filters it reeled of 110kw at the wheels. this was on initial tuning, i havent seen him for a few weeks. ill be interested on an update.

    If thats the power you are after then it could be worth the gain, although aparently there was a bit a messing round with the setup to get it right. unsure of exact details tho....
    Quote Originally Posted by The Witzl
    Please visit here, they will have all the answers you need for this "conversion" - www.hot4s.com.au

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    Default Re: 20v BT head on a 7AGE

    Quote Originally Posted by Dale
    edit: i was horribly wrong
    it's okay.

  7. #7
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    Default Re: 20v BT head on a 7AGE

    Quote Originally Posted by slide86
    I have a mate with a 7AGE 20v

    With standard head and rebuilt engine, wolf 3d, exhuast and air filters it reeled of 110kw at the wheels. this was on initial tuning, i havent seen him for a few weeks. ill be interested on an update.

    If thats the power you are after then it could be worth the gain, although aparently there was a bit a messing round with the setup to get it right. unsure of exact details tho....
    is he still using the same porsche 924 timing belt?

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    Default Re: 20v BT head on a 7AGE

    Quote Originally Posted by chadix24_7
    is he still using the same porsche 924 timing belt?
    I think you need to use a different belt as I think the 20V and 16V has different belt profiles.... Let me get back to you on Monday as I have both a 7AGE 16V and a couple of 4AGE B/Ts at work. Personally, the B/T head won't gain much over a good 100Kw head that has been re-build properly, and the 100Kw will cost you less to get more done to it.

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    Default Re: 20v BT head on a 7AGE

    Quote Originally Posted by johnny
    I think you need to use a different belt as I think the 20V and 16V has different belt profiles.... Let me get back to you on Monday as I have both a 7AGE 16V and a couple of 4AGE B/Ts at work. Personally, the B/T head won't gain much over a good 100Kw head that has been re-build properly, and the 100Kw will cost you less to get more done to it.
    thanks, i'll be looking forward to that.

  10. #10
    Junior Member Backyard Mechanic Dimitri's Avatar
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    Default Re: 20v BT head on a 7AGE

    i can tell you for sure that the black top and silver top belts are differant. obviously if you go to the 11:1+ cr of the black top head/rod combo, over the 9.7 you have with your big port youre going to make power there.

  11. #11
    Junior Member Grease Monkey Jonny Rochester's Avatar
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    Default Re: 20v BT head on a 7AGE

    I am guessing the 110kw at wheels is with some fatter cams and reving well past 8? Harder to believe otherwise.

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    Default Re: 20v BT head on a 7AGE

    Quote Originally Posted by Jonny Rochester
    I am guessing the 110kw at wheels is with some fatter cams and reving well past 8? Harder to believe otherwise.
    Fatter Cams. yes I reckon you'll need them, but Revving a 7A bottom past 7500, it ain't going to last very long with standard rods, so nice light weight A/M rods will be necessary and the crank and Flywheel will have be enrolled into the next Jenny Craig session... way too heavy to be revving that hard.

  13. #13
    Junior Member Backyard Mechanic Dimitri's Avatar
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    Default Re: 20v BT head on a 7AGE

    the bloke who does my wheel alignments has a 7a20 (silver top) in an IPRA ke55. he revs it to 9000 rpm when he races it. i think its done a whole season. the rods are definately said to be not up to par with 4ag rods.. but they can hold together it seems. nothing id bank on. if you have a 7a though maybe you wont need to rev it as haard anyway?

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