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    Pistons, pistons, pistons

    ok, I have searched and read for the past 3 hours, posts from now, all the way back to 2004, and have a huge headache and am more confused than when I started.
    Here is what I have and what has happened.
    93 gt 180,000 miles with about 30,000 on gtx turbo goodies,
    gtx turbo/manifold
    gtx injectors
    CS downpipe
    rx7 na maf
    upgraded fuel pump and others

    I have read and understood that (correct me if I am wrong) these engines handle up to if not more boost on stock settings. I had good results with stock 8.8 boost. 196hp/198tq on dyno about a week ago. Bought a hallman boost controller and increased boost to 12 pounds, Figured I was ok with that setting, a/f through aem wideband was reading 12-13. I had a little bit of boost creep but just eased up to wot to help correct that. Anyway, didnt really know what detination sounded like until yesterday/today. Didnt hear it until wot and a/f were still good, then ran rough and clunked and smoked....blah,blah,blah, hole in pistion, so I think, pulling the head on monday. I had just changed the spark plugs (NGK) before this happened and they were brown and also added the rx7 maf which I was told was from an rx7 turbo but found out later today (after the boom) was not. The engine ran super rough at idle and to get it to run enough to stay running at idle I had the distributor turned all the way towards the firewall. When on the gas engine ran nice and smooth with no issues, and seemed ok, I was not beating on the engine and was on my way to get the timing checked as I knew something was wrong, but I never made it.

    Now here are my questions... I have a spare bp engine with 60k. I am gonna drop that one in and want to know what you guys think I did wrong. I have a ms system that I am going to be putting in shortly, still need somethings for it.
    Why did I have to adjust the timing so much for it to run?
    Is the stock compression ratio 8.8:1 on the bp enignes? If so, from the last 3 hours of reading, then the piston bs should not have happened with such small boost, unless I have other issues.
    Please try and understand that I have read and searched, which that is not the best search engine I have seen, these forums for info. I have read alot of conflicting info and am trying to have a reliable yet powerful engine. Since the engine is out, I am going to go with gtr rods and wiseco pistons, I would like to stay stock size, no boring if possible. That is about all I have been able to understand from the reading. I understand all the injector info and turbo differences. Its the internals of the engine that are confusing me. I would like to stay with a low CR so I can have a bigger range for error. I am going to purchase a rebuild kit for the engine and replace the oil pump, water pump and get the mazda oem head gasket. Gonna get the injectors flow tested or hopefully get some gtr ones.
    Should I balance the crank?
    My head hurts and cant think of anymore questions at the moment, I know have I more but its a start. Thanks

    #2
    with a vj20 you shouldnt need anything stronger than a stock motor, but if you wanna build it up more power to you.

    8.5 or 9.0 :1 cr should be fine. you'll have a litle more off the line power with 9.0. either should be no problem to tune with MS

    if you had the distributor turned all the way to the firewall it was at maximum advance... WAY too much advance. that is why your motor blew up.
    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


      #3
      Wow thats a lot of advance.
      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.

      Comment


        #4
        Timing- Do you think I was off a tooth on the belt?
        Pistons- Upgrading them, but the rods should be strong enough for what I am planning. T3 later on down the road but 300hp is my MAX, if that.
        headgasket- Maxda oem one is the one that I keep hearing about. For what year, model?

        Comment


          #5
          90-94 pro lx for the headgasket

          gtr rods will take close to 400hp with a good tune. stock rods are ok up to ~250hp

          you might have been off a tooth or something, or you just set your ignition timing wayyyyyyyy off.
          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


            #6
            Did you tune the VAF to the car? If you hadn't, it would give you that sort of idle problems and not run correctly...

            And stock rods can take more than that if you know what you're doing :p
            sigpic

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

            Comment


              #7
              I was running the stock gt vaf for the whole time until 2 days ago and running only stock boost and I still had to have the timing pinned to the firewall for a smooth idle. I must have been a tooth off.

              Comment


                #8
                If that's what it took to get the car to idle you should have taken it apart immediately to look for the problem rather than try to drive it.
                sigpic

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

                Comment


                  #9
                  I was thinkin the same thing why would you drive the car boosted with full advance when it wouldnt idle properly. How long did it actually run on full advance?
                  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.

                  Comment


                    #10
                    at stock boost.. about 30,000 miles making 198hp/196tq. I realize it doesnt make much sense to you, but for me who is learning and has asked this question before on this site and feoa and has gotten no response, well I did what worked. you can look at me like im a retard, thats fine with me. I am learning. everyone seems to want to argue and the info is at the least conflicting on what I should go with. so I went with what the car wanted, I have been reading old posts, and trying to understand all the information and make a decent decision with my choices and also trying to understand the lingo. Anyway.... Looking to purchase the gtx rods (1.6) for the bp motor, will they work? From the reading, they should, and they are stronger than the 1.8 rods. Goin with 9.0 cr and gonna work on the timing and gettin the ms installed, got a guy here that runs it in his neon, he has offered to help if needed... sucker....lol Still havent heard a response to the boring of the cylinders, do really have to? Can I still acheive the 9.0/9.1 cr? Thanks so far for all the responses..

                    Comment


                      #11
                      The older 323gtx (b6t) rods work just fine and I believe would be good for 350hp.
                      1993 Protege LX-Midnight's shadow SOLD
                      1996 Honda CBR600-Wrecked. Damn Honda crippled me
                      2002 mazda MPV-family truckster SOLD
                      2010 VW routon

                      Originally posted by jay
                      .....they totally underestimated the number of gearheads such as myself that have families but refuse to grow the hell up and stop playing with cars, or that otherwise see the utility of having 4 doors. Obviously I ain't alone, as there are a helluva lotta sti and evo here. Bueler? Beuler? Mazda? Mazda?

                      Comment


                        #12
                        Unless your bores measure out perfectly (round and not tapered), you should get the block bored - at the very least, re-honed. This ensures that the new piston rings will wear in properly, etc. I am not even sure if you can find aftermarket pistons in the stock size?

                        --Ferdi
                        If you can't differentiate between brake and break, you should go back to school
                        -----
                        Miscellaneous Pics of Turbo Protege Build
                        Big Front Brake Install using Wilwood Calipers
                        Factory Service Manuals and Familia Brochures - PDF

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                          #13
                          thanks very much for all the info, if you feel there is something else I should be doing that I am not, fire away. I deserve s%#t for the timing issue.

                          Comment


                            #14
                            I never saw any mention of a GTX ECU in your list there. What exactly are you using for engine management?
                            Not the sports page Not a magazine

                            Comment


                              #15
                              Originally posted by roymacavoy View Post
                              ok, I have searched and read for the past 3 hours, posts from now, all the way back to 2004, and have a huge headache and am more confused than when I started.
                              Here is what I have and what has happened.
                              93 gt 180,000 miles with about 30,000 on gtx turbo goodies,
                              gtx turbo/manifold
                              gtx injectors
                              CS downpipe
                              rx7 na maf
                              upgraded fuel pump and others
                              running gtx ecu. I was under the assumption you could not run stock boost with a gt ecu.

                              Comment

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