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B21a

Discussion in 'General Tech and Maintenance' started by [spoon], Jan 29, 2003.

  1. [spoon]

    [spoon] Member

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    My 1991 Prelude SR-SE 4ws has this motor and i was wondering what could be done to it.
    Id like to...
    1) Exhaust (full system... header to pipe... preferrably a Greddy system)
    2) Intake
    3) Short Shifter
    4) anything else youd recomend.

    Ive looked all over the net for info and specs on the B21A1 and have found nothing. I know its a special canadian engine and that its based off the B20
    Please please help me as im in a predicament as to keep the car (as i do love it) and mod it or find something more common. I want to play with it... thou seemly the 21 isnt a player friendly engine :(
     
  2. xj0hnx

    xj0hnx I wanna be sedated VIP

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    Location:
    C.C.TX.
    Displacement (cc): 2056
    Power (bhp@rpm): 140@5800
    Torque (ft/lbs@rpm): 135@5000
    Compression Ratio: 9.4:1
    Bore (mm): 83
    Stroke (mm): 95
    Cam Design: dohc
    VTEC?: no
    OBD: 0
    Year(s) Produced: 1990-1991
    In the following car(s): Honda Prelude Si

    The mods you listed can be custom made,the only one you my have problems with is the short shifter.I'm not sure what other motor yours cross references with but find that out and parts will be easier to find.
     
  3. pissedoffsol

    pissedoffsol RETIRED

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    modding it anymore than basic bolt ons is going to be a lot of money and a lot of work.

    they are the red-headed step child of honda motors, the b20a and b21a are. sucks. the really only thing that is compatible with other b-seires motors is the crank... which really doesn't need to be replaced anyway.
    the rod/stroke ratio on it sucks, making top end revs hard to come by safely.... and thats why there's a lack of top end power that honda motor's are 'known' for.

    IMO, if you aren't too too attached to the car, you are better off selling it for a car that has a better aftermarket.
    if its reliable, and you like the car- keep it. it will be a great daily driver for 200k miles or more. and save up for a cheap hatch or crx for a grand or 2... and start building that as a project car.
     
  4. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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  5. pissedoffsol

    pissedoffsol RETIRED

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    lol ok dude :)

    and what kind of rods do you plan to run? or are you going to deck plate it to hold the 93 mm stoke? :)
    and then get a custome hood so it fits in your bay? :)
     
  6. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    Custom 166mm rods... deck plate yes, custom hood yes... money NO. So no. :lol:
     
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