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08-02-2008, 12:42 AM | #1 |
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Rebuilding N/A BP DOHC
Hey fellas,
Dont really know where to put this post so move it if u want. My DOHC is needing a new headgasket, I think.. and i dont really want to do it to that motor. So, I have bought lynx's old BP N/A that he has sitting under the house. The plan is to rebuild it.. some new pistons & rings to suit, head clean up and some new gaskets/seals.. nothing to extreeeme. Few questions.. What is the max bore you want? 60 thou? 40 thou? What is the best brand on stock, non forged, piston you can get? What about gaskets and all that? What brand? I dont want a physco build or anything.. I just want something that runs well and is like NEW! The reason I am not just doing the head gasket on my one is because i am wanting to open up a engine and fiddle, and my engine is still running atm so when it goes ill take it and put a fresh one in, in a few months. Thhhanks, Dan |
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08-02-2008, 06:49 AM | #2 |
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80thou / 85mm bore is the biggest you can go - I wouldn't recommend it as the block will be useless and need to be replaced in 100,000km. but as you are doing a non-performance rebuild, 20thou / 83.5mm bore would be what you require.
I dunno if you can actually buy non-forged pistons for BPs, unless you go buy original from mazda, and I bet they charge more than Arias or Wiseco Pistons do for forged stuff. Until you open it up, you won't know whether you require newer pistons or not. You may only require new rings... And if you are doing a rebuild, I'd add things to the list like:- VRS kit (has head gasket in it,) water pump, all belts, sump seal. Ryan |
08-02-2008, 08:59 AM | #3 |
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yeah definatley the way to go Mr Ry Ry, thats smart
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08-02-2008, 10:55 AM | #4 | |
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Quote:
Sleeves can generally live with a greatly reduced space between cylinders, due to the specialised materials that are used. Cost to sleeve is not *that* much more than an over bore (i think I was quoted $150 extra or something to sleeve over plain jane over boring). Its certainly worth checking out. most pistons these days are forged, regardless. OEM or otherwise. not sure about the BP, but the FS pistons certainly are forged from factory.....forged doesn't immediately denote strength - a lot has to do with the types of materials used the form the piston. CP make unreal pistons - with some state of the art chemistry.....i've been told they are some of the quietest after market pistons you can get. beauty of going to after market pistons is that you can up the compression, which in turn allows you to run a more agressive cam profiles with bigger overlap (i.e. you can afford more dynamic compression loss because your static compression is higher).... slightly higher comp pistons certainly opens a lot of doors in the future, even if you don't open those doors straight away. You can also play with things such as lifting the wrist pin which allows for longer rods. longer rods means better rod:stroke ratio, which is one of the more important factors for lifting the red line (rod:stroke ratio plays an important role with regards to piston acceleration, and to a less important extent, side wall loading due to less rod angularity). Last edited by LordWorm; 08-02-2008 at 11:01 AM. |
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08-02-2008, 11:20 AM | #5 |
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My current BP is lacking in torque.. alot.
I am wanting to keep stock exhaust and have a CAI and new induction. I want to keep same ECU too (stock) I need something that will last 50-60 thousand k's.. I DONT need this car to last 500 000k's.. |
08-02-2008, 01:41 PM | #6 |
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08-02-2008, 01:51 PM | #7 | |
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Quote:
OK BP's have low to no torque due to there pistons compression levels (first gen atleast) also there cam timing/lift/duration isnt worth mentioning . as its not performanced based! why,..its called "emissions", back in the 80's when the BP was design. it was more about emissions/mileage than all out power if you want more power, buy some 11.1 compression pistons...but then you'll need cams to get good use of the pistons, but then you'll need a aftermarket ecu. then you need tuning..etc etc if you have the money for all the above cool..if not...sadly the BP isnt going to do what you asked of it might have to settle with a BP thats rebuilt back to OEM spec
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1996 ST205 Toyota Celica GT4 *Gone* 1991 Astina GT, 102wkw/138whp Built a KL-ZE 220whp engine for a KF Laser |
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08-02-2008, 03:38 PM | #8 |
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Yeha, i have thought for a while about doing the gasket but as i said, i want to pull it apart and all that..
I might just have to stick with a BP stock then, its all good. I wouldnt mine a 2.2 F2 from the 626 though :P |
08-02-2008, 09:13 PM | #9 |
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or a KLZE 2.5L V6? direct bolt in.....(more or less)
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08-02-2008, 09:29 PM | #10 |
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not into a BG it wouldnt be!
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08-02-2008, 11:08 PM | #11 |
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I thought it was alot of work? into a BG that is..
Or you mean a Telstar/626 Greggie? |
09-02-2008, 12:07 AM | #12 |
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think of it this way
ba's come with bp's and v6's and chassis mounts are the same... i've also seen a v6 in a bg |
09-02-2008, 12:15 AM | #13 |
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the KLZE doesnt fit in with out lots of modifications though?
so the 2.0L V6 will fit in the bg from the ba/ |
09-02-2008, 12:32 AM | #14 |
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probably. but your engine bay looks to have less room than a BA, so good luck working on one
KL-ZE in BG would = teh sex
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09-02-2008, 06:52 AM | #15 | |
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Quote:
there is a reason the BA engine bays are 100-150mm deeper than BG engine bays. i'm not discreditting the idea, but there is a reason why pete gave up on it in the end. ryan |
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10-02-2008, 09:36 PM | #16 |
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imo, a new radiator is certainly no reason to give up on the idea
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10-02-2008, 09:43 PM | #17 |
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whos pete and why did he give up on it? "it" being fitting a BA v6 in a BG?
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10-02-2008, 09:46 PM | #18 | |
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Quote:
"it" being KLZE into a BG. |
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10-02-2008, 09:56 PM | #19 |
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ah yeha, boostedbatmans the PT around this area! yeah he has had that KLZE hanging around for ages.
Whats the go with the V6 in the BG? |
10-02-2008, 10:00 PM | #20 | |
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Quote:
I don't know if this was the only reason pete gave up on the idea..... edit: KLZE isn't the BA V6, but i'd imagine it would have the same problems the KL does - bolt straight in, other items not so easy...... |
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