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lowest stock compression

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    #1

    lowest stock compression

    okay, let me first apologize cause i can't seem to find the thread that lists all the info for the possible motor swaps, but i know there is one.

    what im looking to find is which stock motor has the lowest comp. ratio of all the motors that can be swapped in to our cb's. I have an H23 and i plan on definately boosting in the near future, but i don't want to build the H if there is a better motor for boost that i could get. any help is greatly appreciated. peace.

    5 months old and already a lady killer

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    #2
    http://www.cb7tuner.com/vbb/showthread.php?t=39834

    It's in the sticky in the Swaps forum (most useful threads are in the stickies, if not stickies themselves, in the index threads)

    The F22A, the stock engine, has 8.8:1 compression. That is the lowest you'll find. The JDM F22B DOHC, which is pretty much the Japanese equivalent to the H23, has 9.2:1 compression, which would be next. The H23 has 9.8:1 compression, which is boostable, but pushing the limits of safe tunability.

    You CAN boost a VERY high compression motor. The higher the compression, the smaller the window for error is.


    Honestly, ANY stock Honda motor isn't made for turbo (save for a few that came from the factory... I can think of 3). An H23 started life in a Prelude. Probably driven carefully for the first 5-6 years by the original owner. It's a US car, so the chances that the second owner beat on it are pretty good... 5-6 years old means a kid could buy the car and have fun in it. Being a US motor, it's also likely to have pretty high mileage. Aside from the fact that it's not meant for turbo, the engine has probably seen a good bit of wear and tear. If you boost a stock Honda motor, be prepared to rebuild it or replace it in the future. It may not blow... but I wouldn't count on it lasting forever.


    Now, if you're going to build the H, the stock compression means nothing. You can change that with the pistons. The H23 has the same FRM sleeves as the H22, however... so standard forged pistons won't be compatible. You'll need special pistons, such as the Mahle Gold Series, or you'll just have to resleeve (which would be your best bet... stronger, too)






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