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c/r for JG built closed deck sleeved engine

Discussion in 'Engine Building' started by rexaddict, Mar 12, 2008.

  1. rexaddict

    rexaddict turbo ex

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    Hello,

    I am buying a built short block this weekend that was built by JG Engine Dynamics. I am going to be mating this engine to a 99 gsr head. My question is if anyone has any idea on what the compresion ratio will be for it. The block is a b18b1 that has been sleeved and bored to a size of 86mm and the deck height has been resurfaced. The block also has closed deck sleeves. The pistons are forged CP racing pistons that are 84.5mm and 12.5 compression ratio. I am going to be putting this in my daily driver DA integra. I will be running chevron supreme at all times. If you have any information about what i am doing or any comments I am all ears. I would like to find out if this is a good or bad idea for a daily driver on 92 octane pump gas. As you can tell i am a noob to the technical aspect of engine building. So please go easy on me. If i am asking a question that has been answered before in a different thread just let me know and i will be happy to read it. I have tried to use the compression ratio calculator but i do not know the piston dome displacement. Ideas on how to get it would be great. i dont have time during the day to call CP pistons so i am not able to get the info from them. I have also tried their website with no luck. Thanks for taking the time to read my post and thank you again if you have a response.

    Also i forgot to add that the block originally had a b16 head on it afterit was built.
     
    Last edited: Mar 13, 2008
  2. rexaddict

    rexaddict turbo ex

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    Thanks Blanco. I have not spent the money yet. I wanted to find out before i spent it. I spoke with a tech at Intec Racing in Kent WA and he told me pretty much what you just said. Thanks again for the info. I am now going to use the money to build my ls block from the integra.
     
  3. LS_VTEC

    LS_VTEC you get the BRAKE

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    Not to burst your bubble, but you stated that the block was sleeved and bored to 86mm BUT it comes with 84.5mm CP pistons? That is not possible. Even with a re-sleeved b18a/b shortblock, boring the sleeves to 86mm wouldn't be too bright since your new sleeves just got that much weaker with that massive bore.
     
  4. LS_VTEC

    LS_VTEC you get the BRAKE

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    Doing this with a b20 block is not out of the ordinary, but once again the b20 block has a stock bore of 84mm. Much more to work with especially with new sleeves.
     
  5. rexaddict

    rexaddict turbo ex

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    Sorry about that. I thought they were bored to 86mm but in fact they are good to a max size of 86. the cylinders are bored to fit the 84.5 pistons. So moving on, what do you guys think of a cometic head gasket to bring the c/r down.
     
  6. rexaddict

    rexaddict turbo ex

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    5mm over 81mm, not 84mm?
    I dont see what your sayin.
     
    Last edited: Mar 13, 2008
  7. rexaddict

    rexaddict turbo ex

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    Ah i get it. Might you have any thoughts on using a thicker cometic head gasket to lower the c/r.
     
  8. LS_VTEC

    LS_VTEC you get the BRAKE

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    :thumbsup:
     
  9. Luis998

    Luis998 Honda Enthusiast

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    Yet another good thread to learn from. Scott and LS, the stock bore of a B20 is 84mm, correct? If that is so, after re-sleeving the block, would one be safe boring it to 86mm? Anytime you over bore the cylinders, is the end result more displacement? How does one determine a safe and effective measurement to bore to? Would that be defined in the goals you have for the build? Thanks guys.

    Rex, both of these guys know what they are talking about. Take the time to search on the site as well. There is a lot of great information on here. I really wish you the best on your build. Please keep us updated as I, for one, am curious as to how it turns out.
     
  10. Luis998

    Luis998 Honda Enthusiast

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    Thank you once again, Scott. :D
     
  11. rexaddict

    rexaddict turbo ex

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    Thank you Blanco for the information. I have decided against buying the jg block. Instead I am putting a new turbo, turbo manifold, wastegate and other things on my civic. I am just going to throw a b16 in the integra because i really just wanted it as a work car and putting that built of an engine in it would be a waste. Thanks again on the info because it helped me to make what i believe is the right choice.
     
  12. LS_VTEC

    LS_VTEC you get the BRAKE

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    Well I see Scott has been answering your questions. My name is John, btw. We will be opening up a machine shop in the next decade or so, so keep in touch for the grand opening of S&J Engine Dynamics!





























    jk. :)
     
  13. Luis998

    Luis998 Honda Enthusiast

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    It's finally nice to know your name, John. My name is Don Quixote aka Mr. Bean, aka Luis Juan Pedro Miguel Jose Francisco Gustavo Javier Arnaldo Banana nana fo fana the third, or Luis for short. :D
     
  14. Luis998

    Luis998 Honda Enthusiast

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    Do you have your B16 already or are you looking to build one up and are looking for parts? *raises eyebrow*
     
  15. LS_VTEC

    LS_VTEC you get the BRAKE

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  16. rexaddict

    rexaddict turbo ex

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    I dont have the b16 yet. Just going to order the long block from H Motors.
     
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