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    bp head

    just wanting to know ...what kind of gains should i expect when i send my bp head off to be shaved and a valve job? im looking for relativley cheap hp and throttle response gains for my 91 egt race car.my next move will be with a pacesetter header
    sigpic

    #2
    a valve job wont give you any gains, unless you had leaky valves to begin with.

    as far as having the head shaved it depends how much they shave it and how much that raises the compression.
    Escort GTR -- 11.87 @ 117.6 mph -- 320 HP / 325 Ft. Lbs. @ 23 PSI
    ... The first FWD BG with a Toyota E153 transmission conversion in the USA!
    Looking for BP x Toyota E153 adapter plates? PM me or contact me on Facebook: Riel Performance Parts

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      #3
      there's only so much you can shave off to keep your valves safe from playing patty-cake with the pistons too.

      I believe the MAXIMUM TOTAL is .060"

      JACK.
      -Jack

      ONTARIO MAZDA CLUB! Join! https://www.facebook.com/groups/500055016671733/

      91 626 LX - basically stock and pretty slow still
      http://www.clubprotege.com/forum/sho...my-GD-626-LX-)

      01 E53 3.0i - FOR SALE! pm if interested

      91 USDM Protege LX - SOLD! turbo/manifold up for sale!
      http://www.clubprotege.com/forum/showthread.php?t=46606

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        #4
        when taking this thing apart...are there any parts i should go ahead and change out while its tore down? id like to get some things that hold up under high rpms. like i said im normally turning about 7500 when i hit the corner.
        sigpic

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          #5
          I had mine decked .030, looked like a lot, but seems fine considering the cams and pistons have all been rotated independantly and also together with the cams about 180 degrees off. It raised the compression up about 1 point and made for a deent little bump up in power.

          -Jon R.

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            #6
            i decked mine .55 raised the CR from 8.5 to 9.3

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              #7
              what pistons did you have that you had an 8.5:1 CR? i thought the weisco's came in 8.6:1. GTX is 8.2:1 and stock NA is 8.8:1
              Escort GTR -- 11.87 @ 117.6 mph -- 320 HP / 325 Ft. Lbs. @ 23 PSI
              ... The first FWD BG with a Toyota E153 transmission conversion in the USA!
              Looking for BP x Toyota E153 adapter plates? PM me or contact me on Facebook: Riel Performance Parts

              Comment


                #8
                the weisco's are 9:1 for turbo, at least from flyin miata. the supertech pistons are 8.5 or 8.6
                1994 Escort LX Wagon
                2013 Hyundai Veloster Turbo
                91 Infiniti M30 Convertible - Traded in for Veloster
                91 EGT - Junked May 2012

                "Going to church doesn't make you a Christian like standing in a garage doesn't make you a car."

                "I usually downshift when I'm near a Prius so they can hear me hurting the environment"

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                  #9
                  Originally posted by therieldeal View Post
                  a valve job wont give you any gains, unless you had leaky valves to begin with.

                  as far as having the head shaved it depends how much they shave it and how much that raises the compression.
                  if you get a multi-angle valve job it would give you better flow and "maybe" a bit more power.

                  or something.
                  sigpic

                  03 Accord DX: K24/5MT, peasant-spec old man's car
                  92 240SX: KA/T25, nerd mobile

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                    #10
                    its not gonna do much unless you are moving a serious amount of air, i.e. youve got boost (since we sure as hell dont have V-8's)
                    "Beer is proof that God loves us and wants us to be happy"
                    -Benjamin Franklin

                    i wish my grass was emo, then it would cut itself
                    -dedicated to sling blade, aka, meltdownsky

                    this is a horrible trick and should be deleted immedately - wheresthericego
                    http://www.wihandyman.com/forum/showthread.php?t=35130 - BWAHAHAHAHAHAHA

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                      #11
                      oh yeah, that boost thing.

                      so maybe it does something for me :o
                      sigpic

                      03 Accord DX: K24/5MT, peasant-spec old man's car
                      92 240SX: KA/T25, nerd mobile

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                        #12
                        omg, your smartassery is so delicious.
                        "Beer is proof that God loves us and wants us to be happy"
                        -Benjamin Franklin

                        i wish my grass was emo, then it would cut itself
                        -dedicated to sling blade, aka, meltdownsky

                        this is a horrible trick and should be deleted immedately - wheresthericego
                        http://www.wihandyman.com/forum/showthread.php?t=35130 - BWAHAHAHAHAHAHA

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                          #13
                          hey i have 10:0:1 pistons how much can i shave the head? thanks

                          Comment


                            #14
                            Originally posted by JUNYDRAGON View Post
                            hey i have 10:0:1 pistons how much can i shave the head? thanks
                            why would you want to shave any off the head?
                            I live my life a quarter pounder at a time. And for those 500 calories or more, I'm free. I need FRIES! Two of them. The big ones. Oh, and I need them tonight. You're lucky the double shot of BBQ sauce didn't blow the seam on your nugget box. There she is, 2 pounds of pure beef. My dad ate it in 9.0 seconds flat. Check it out, it's like this. If I lose, winner takes my happy meal. But if I win, I take the burger and the toy. To some people, that's more important.

                            ._________________________
                            |.....Overnight....................| ||
                            |.....Japan Parts.................| |'|";,___.
                            |_..._...____________======||_|_|...,]
                            "(@)'(@)""'''''''''''''"'''"**|(@)(@)*****"(@)
                            Oh and by the way that shot in your banner with Vin Diesel's car getting shot, thats a civic not an altezza.

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                              #15
                              to increase compression a bit i guess?

                              best way to get your head machined is take it off, bring it to a machine shop, and ask them to take some material off it.

                              i'll be taking as much as i can off to increase compression since i'm staying with stock pistons.

                              JACK.
                              -Jack

                              ONTARIO MAZDA CLUB! Join! https://www.facebook.com/groups/500055016671733/

                              91 626 LX - basically stock and pretty slow still
                              http://www.clubprotege.com/forum/sho...my-GD-626-LX-)

                              01 E53 3.0i - FOR SALE! pm if interested

                              91 USDM Protege LX - SOLD! turbo/manifold up for sale!
                              http://www.clubprotege.com/forum/showthread.php?t=46606

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