1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Engine Swap from B21A1 to B20A5 Question

Discussion in 'Prelude' started by tprelude, Sep 17, 2007.

  1. tprelude

    tprelude New Member

    Likes Received:
    Sep 17, 2007
    Hi, I'm a rookie when it comes to cars so I need some input.
    I just bought a 90 Prelude SR with a B21A1 engine and one of the values has very little compression, which we have concluded from reading on the internet that it's the piston rings and possibly the value sleeves.
    What I was thinking of doing is swaping the engine for a B20A5 (90 or 91) and was wondering if anyone has done this before or if the B20A5 will fit properly without any headaches? I was also wondering if there would be any modifications that would need to be done to the computer, wiring, etc because of this swap?
  2. 1Funryd

    1Funryd Member

    Likes Received:
    Dec 8, 2006
    Yes, just swap the B20A(JDM) or A5(USDM) motor only, use all the other things like Intake manifold and all sensors and flywheel from the B21A1.

    Its a direct bolt on.

Draft saved Draft deleted

Share This Page