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Thread: J20A vs J20B

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  1. #1

    J20A vs J20B

    I have a Suzuki SX4 and Iím trying to switch mine out with a one in better condition. I was wondering what the difference between the J20A engine vs the J20B?


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  2. #2
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    One has an A at the end, the other, a B

  3. #3
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    Ok, so, from what I can gather, the B is more like the engine that they use more frequently around the world, and is the most recent version of the engine that you can get in the car. Also, and I know I will get push back from some, but it seems that the J20B has proven to be the more reliable engine. It seems that the A has more rod/rod bearing issues, and it more prone to failure.

  4. #4
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    The A had been around for a decade when our cars were new. It's a time proven design. They are not unreliable as long as they are maintained. Parts can be found with relative ease. The powerband is not impressive but output is within a few hp and torques of the later B engines..

    The B only existed in the US market for a few scant years, is comparably rare, is more mechanically complex with more possible points of failure, and has a disappointingly low specific output for a 4 cylinder of it's era. That's not to say it's a bad motor but the additional complexity, parts scarcity, unproven design due to less time on the market, and low power output were all factors in my search for a second Sx4 and why I specifically sought a pre 2010 model.

    That said, I would still like to see a j24b swapped SX4. With 30 more hp on tap the car would be a hoot to drive. Suzuki had all the makings of a poor man's Golf R at their disposal but failed to deliver.
    '09 SX4 AWD 5-spd Technology Copper Sunlight Metallic - RIP
    '15 Ford Fiesta ST Tuxedo Black, Stage 2+ E30 tuned (SOLD)
    '09 SX4 AWD 5-spd Touring Copper Sunlight Metallic - v2.0

  5. #5
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    J20B added VVT also

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  6. #6
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    Yeah, I do not believe there were any parts shared between the A and B engines. Apples to oranges.
    '09 SX4 AWD 5-spd Technology Copper Sunlight Metallic - RIP
    '15 Ford Fiesta ST Tuxedo Black, Stage 2+ E30 tuned (SOLD)
    '09 SX4 AWD 5-spd Touring Copper Sunlight Metallic - v2.0

  7. #7
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    Forestville, CA, USA
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    Having owned a 2007 with J20A/5 speed manual (143 hp) AND a 2012 with J20B/6 speed manual (151 hp), I can say I like the J20B the best. It has a much wider power band, due to the variable valve timing, and better fuel mileage. I have 165,000 miles on the J20B (mostly highway miles). It has been very trouble-free to this point. It has been the best car for the money I have ever owned. I wish Suzuki was still in the North American market so I could buy a new Suzuki.
    The Black Pearl
    I sold my 2007 SX4 and replaced it with a 2012 SX4!

  8. #8
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    Nov 2010
    Location
    Puyallup, WA
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    Cool

    I still have my 2007 SX4 with out any break down and 120,000 miles on it as my daily driver so that I don't put that much mile and my fun car genesis coupe 3.8 2013. I love driving the sx4 as a DD. As for the j20b with cvt, I would not touch it, I don't like cvt and from what I have research, the only benefit is fuel economic, which has been prove to be the opposite or neutral, in general with all car manufactures, just my opinion.

    I also wish Suzuki would still be here or came back!

    [/I]
    Quote Originally Posted by Dowser View Post
    Having owned a 2007 with J20A/5 speed manual (143 hp) AND a 2012 with J20B/6 speed manual (151 hp), I can say I like the J20B the best. It has a much wider power band, due to the variable valve timing, and better fuel mileage. I have 165,000 miles on the J20B (mostly highway miles). It has been very trouble-free to this point. It has been the best car for the money I have ever owned. I wish Suzuki was still in the North American market so I could buy a new Suzuki.
    Present 93 Scoupe Turbo, 04 RX8 GT, 07 Sx4 Crossover, 05 Grand Cherokee Laredo
    Past 81 Corolla, 86 Rx7, 92 Civic si, 93 Rx7 Twin Turbo, 91 Mx6 Turbo, 01 RSX Type-s

  9. #9
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    And here I was hesitant to buy a j20b car partially because I haven't seen any long term reviews. My wife had a b equipped sedan but we didn't have it long. It was also a cvt so comparing powerbands was impossible.
    '09 SX4 AWD 5-spd Technology Copper Sunlight Metallic - RIP
    '15 Ford Fiesta ST Tuxedo Black, Stage 2+ E30 tuned (SOLD)
    '09 SX4 AWD 5-spd Touring Copper Sunlight Metallic - v2.0

  10. #10
    Join Date
    Jan 2022
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    I will add that the J20B has a different timing chain/guide setup using 3 gears total with different head, valve cover is plastic vs alloy on the J20A. The block is different along with the transmission and engine ECU.
    '13 Suzuki SX4 6spd AWD/ '84 Buick Regal turbo/'84 Isuzu Impulse/'66 Crown Corvair/'66 Buick Riviera GS/'65 Corvair turbo

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