Interchangeable parts? BP Motors NA/NB
07-12-2012, 12:54 PM
#1
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Interchangeable parts? BP Motors NA/NB
I've been refreshing a 99 motor and I keep running into small discrepancies. If I look up parts from the dealer or any auto part stores I find them to be different from year to year. A good example would be rings. If i go to rock auto and search for rings for a 94 It lists 4 different options for standard sized rings. If I look up a 99 it shows 1 option. Same goes for oil pumps. When I had the dealer look up some parts like said piston rings they had 2 different prices. The part number for the one set of rings for the 99 matched a set of rings for the 94.
Using common sense I've been able to order the correct parts. I have been screwed enough times by morons grabbing ---- off the shelf and not checking the box to the point where i'm actually quite paranoid and skeptical every time I order or buy anything.
So when rebuilding a bottom end is there anything notably different between the BP motors? The only thing i have left to buy is my oil pump and possibly some new arp studs/caps.
I have a 2560 and don't really plan on being over the 250hp 200ish tq mark. I don't have the money for forged rods, pistons, boundry oilpump.
Anyone have a recommendation on where to get a decent oil pump? It's tempting to buy this Oil Pump but the price scares me and I have never heard of the brand. Also do i need to replace the factory head bolts? I think i read somewhere on here that they are known to break when re tightened. Also do i need to replace the studs/nuts on the rods? Any recommendations as what to use? I don't have much money left for this build so i'm trying to hang on to every last dollar I can without making the build any less reliable.
Using common sense I've been able to order the correct parts. I have been screwed enough times by morons grabbing ---- off the shelf and not checking the box to the point where i'm actually quite paranoid and skeptical every time I order or buy anything.
So when rebuilding a bottom end is there anything notably different between the BP motors? The only thing i have left to buy is my oil pump and possibly some new arp studs/caps.
I have a 2560 and don't really plan on being over the 250hp 200ish tq mark. I don't have the money for forged rods, pistons, boundry oilpump.
Anyone have a recommendation on where to get a decent oil pump? It's tempting to buy this Oil Pump but the price scares me and I have never heard of the brand. Also do i need to replace the factory head bolts? I think i read somewhere on here that they are known to break when re tightened. Also do i need to replace the studs/nuts on the rods? Any recommendations as what to use? I don't have much money left for this build so i'm trying to hang on to every last dollar I can without making the build any less reliable.
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07-12-2012, 01:07 PM
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Why not use the BP oil pump that came with your motor?
The rings should be compatible, year-to-year, but I would still choose the ones mazda specs for your year motor. The BP remained almost unchanged from 1994-2005. All the heads/bottom ends are compatible. I don't see why any other parts would not be compatible.
Remember, you are building a motor. Better to let it sit on the engine stand a little longer while saving for the parts you need, than jump the gun an instal a ticking time bomb. That being said; a 100% stock BP4W could meet you power goals, so why is the motor apart in the first place?
The rings should be compatible, year-to-year, but I would still choose the ones mazda specs for your year motor. The BP remained almost unchanged from 1994-2005. All the heads/bottom ends are compatible. I don't see why any other parts would not be compatible.
Remember, you are building a motor. Better to let it sit on the engine stand a little longer while saving for the parts you need, than jump the gun an instal a ticking time bomb. That being said; a 100% stock BP4W could meet you power goals, so why is the motor apart in the first place?
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07-12-2012, 09:00 PM
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1) it is from a salvaged Miata (origin unknown).
2) it failed leakdown.
The leak down failure i believe to have been from the head but while I had the head off and motor out figured i may as well make sure nothing else was wrong.
I suppose I could save up and put some forged internals in it but I figured stock would meet my power goals anyway. I cracked a ring on my 1.6 and I figured it was a perfect time to upgrade.
I do feel like I should at least put some china rods in but do I really need to at my power goal? After 250whp aren't there a bunch of issues like oil pump, transmission, traction, not to mention my clutch is only good to about 220-230tq. I have never tracked the car. I still need some other things like a new front sway bar, roll bar, body work, paint, new radiator.
I figured by the time i had all that other stuff taken care of i'd be ready for a new bottom end.
thoughts?
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07-12-2012, 09:11 PM
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I've been refreshing a 99 motor and I keep running into small discrepancies. If I look up parts from the dealer or any auto part stores I find them to be different from year to year. A good example would be rings. If i go to rock auto and search for rings for a 94 It lists 4 different options for standard sized rings. If I look up a 99 it shows 1 option. Same goes for oil pumps. When I had the dealer look up some parts like said piston rings they had 2 different prices. The part number for the one set of rings for the 99 matched a set of rings for the 94.
Using common sense I've been able to order the correct parts. I have been screwed enough times by morons grabbing ---- off the shelf and not checking the box to the point where i'm actually quite paranoid and skeptical every time I order or buy anything.
So when rebuilding a bottom end is there anything notably different between the BP motors? The only thing i have left to buy is my oil pump and possibly some new arp studs/caps.
I have a 2560 and don't really plan on being over the 250hp 200ish tq mark. I don't have the money for forged rods, pistons, boundry oilpump.
Anyone have a recommendation on where to get a decent oil pump? It's tempting to buy this Oil Pump but the price scares me and I have never heard of the brand. Also do i need to replace the factory head bolts? I think i read somewhere on here that they are known to break when re tightened. Also do i need to replace the studs/nuts on the rods? Any recommendations as what to use? I don't have much money left for this build so i'm trying to hang on to every last dollar I can without making the build any less reliable.
Using common sense I've been able to order the correct parts. I have been screwed enough times by morons grabbing ---- off the shelf and not checking the box to the point where i'm actually quite paranoid and skeptical every time I order or buy anything.
So when rebuilding a bottom end is there anything notably different between the BP motors? The only thing i have left to buy is my oil pump and possibly some new arp studs/caps.
I have a 2560 and don't really plan on being over the 250hp 200ish tq mark. I don't have the money for forged rods, pistons, boundry oilpump.
Anyone have a recommendation on where to get a decent oil pump? It's tempting to buy this Oil Pump but the price scares me and I have never heard of the brand. Also do i need to replace the factory head bolts? I think i read somewhere on here that they are known to break when re tightened. Also do i need to replace the studs/nuts on the rods? Any recommendations as what to use? I don't have much money left for this build so i'm trying to hang on to every last dollar I can without making the build any less reliable.
94:
protege LX
protege DX (single cam version)
escort GT
miata
99:
miata
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men drive miatas? you must be a ***.
07-12-2012, 11:14 PM
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would it make you feel better if i put some china rods in?
trust me i want to build it too. i'm having a tough time justifying it though since my power goals are obtainable on stock :-/
trust me i want to build it too. i'm having a tough time justifying it though since my power goals are obtainable on stock :-/
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07-12-2012, 11:29 PM
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Your power goals suck.
You will lose to a stock CAMARO. You will lose to a V6 mustang. You will lose to a WRX with an exhaust.
Losing sucks. Especially after you spent all this time building your motor and some stock motored fool with bolt ons rapes your baby.
Trust me. I have gone 250, ~350-400, and 500+++??? hp. Enough is never enough.
It is good to at least have the choice of more power for a measely $1000 extra
china rods
supertech pistons
billet oil pump
300-400HP is WAYYYYYYY more fun than 250.
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