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Thread: 16v bigport v 20v? Carbs v itb's?

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    Senior Member BMXB's Avatar
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    Default 16v bigport v 20v? Carbs v itb's?


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    Looking at building a new motor for my ae86.
    My questions are:

    What is better as a base motor forte setup I'm after?
    The car will have very light street work and setting it up for drif mostly.

    16v bigport or 20v blacktop or silver top

    16v bigport with 41mm quad carbys and big cams

    16v bigport with itb's and big cams

    20v with cams?

    All with hicomp pistons and aftermarket ecu.

    -also are 20v motor mounts in an 86 any different to that of a 16v?

    And what are the weights of both motors?

    Cheers
    #360

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    Veteran lolwat's Avatar
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    20v blacktop >>> 20v silver top >>>> 16v smallport >>>> 7 rib 16v bigport >>>> 3rib 16v bigport

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    Senior Member Hen may possibly be a nut's Avatar
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    You could add Ford vs Holden, soccer vs footy and pizza vs kebabs to the list too. Everyone has their opinion.

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    Moderator dove grey 64's Avatar
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    for drift i'd say the blacktop, im pretty sure the weight of each of all the 4ages are about the same.
    bigports are a good motor with heaps of potential, a lightened flywheel could also be a good thing to factor into your motor of choice

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    Moderator dove grey 64's Avatar
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    Quote Originally Posted by Hen may possibly be a nut View Post
    You could add Ford vs Holden, soccer vs footy and pizza vs kebabs to the list too. Everyone has their opinion.
    well hen you laid it out as i would have
    Ford>Holden, soccer>footy and pizza>kebabs

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    Be a man. Go BEAMS.

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    Senior Member BMXB's Avatar
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    Are the engine mounts the same for a 20v and 16v?
    #360

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    Quote Originally Posted by BMXB View Post
    Are the engine mounts the same for a 20v and 16v?
    yes and I don't suggest using anything but the original pistons in these engines.
    My website: SQ Engineering - 4AGE and 3SGE upgrade/replacement parts

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    4a engine mounts are the same wether it is 4ac or 4age or 4age 20v silver/blacktop so any 4a ae86 mounts will work

    Weight wise, the only major difference is the number of valves and the quad throttle bodies so if your lucky you'll see maybe 10kg difference at most between them all.

    This holds true
    20v blacktop >>> 20v silver top >>>> 16v smallport >>>> 7 rib 16v bigport >>>> 3rib 16v bigport

    I find the difference between the blacktop 20v and silvertop comparable to the smallport vs bigport.

    Out of the 4a engines, I'd be going for a blacktop, my reasoning being the CR ratio is already high from factory, the bottom end is light and they don't take much to extract ok power from.

    With the stuff samq makes, the 20v is no harder to install than a 16v these days. And if you go for turbo down the track, sure you have to drop the cr ratio , but the blacktop head flows really well and gives much more hp than the 16v equiv.

    After market ecu, either an adaptronic or haltech are the 2 that i'd use.

    There are also other motors out there which are worth looking at, but depending on your budget they might not be viable.

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    Moderator Sam-Q's Avatar
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    what are you doing up so early Matt

    I have had a strangely good run with silvertops, maybe the blacktops I have felt where not very healthy or something. Also I like the higher rev capability of the silvertop. The cranks are the same, piston weight is similar and the rods are only 4% lighter. Once you change the flywheel over to be the same I doubt there would be any difference in feel in pickup. Also a blacktop is an interference engine, something that would of caused my engine to be smashed twice now if I had one. There used to have a disproportionate price difference however now with the 20v supply being much more limited the prices are all over the place.

    So you could say I have a soft spot for the often sited to be inferior engine.
    My website: SQ Engineering - 4AGE and 3SGE upgrade/replacement parts

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