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NB (1998-2005) NB Miata discussion within. In 1998, Mazda released the second-generation MX-5, production code NB, for the 1999 model year.

Thoughts on either option?

Old 08-19-2011, 11:04 AM
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So I'm getting REAL tired of not being able to drive my NB. IBeen shopping for new motors and have found very little in the way of 99-00 engines. I can find 01+ engines by the dozens and 94-97 engines by the hundreds. But very limited 99-00s and so far nothing I want.

So here is my question. Is there anything special I need to know about putting a 99-00 BP-4W head on a 94-97 BP engine? If it works I can get the parts and start today. Otherwise I'll have to keep looking.

Another option is to use the entire 01+ BP-Z3 engine and without using the VVT but that is suboptimal. Right now I can't afford to do the BP-Z3 block/BP-4W head,

Thoughts on either option?
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Old 08-19-2011, 12:04 PM
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As far as I know it will bolt right on.
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Old 08-19-2011, 12:40 PM
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People put the 99-00 head on 94-97 blocks all the time. Use the 99-00 head gasket and you will be fine.
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Old 08-19-2011, 12:55 PM
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Originally Posted by sixshooter View Post
People put the 99-00 head on 94-97 blocks all the time. Use the 99-00 head gasket and you will be fine.
After I posted and thought about this, does the 99 crank sensor bolt on.? I've got a 95 NA, but I've never looked at it. Does the 94-97 use the same crank sensor as the 99s?
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Old 08-19-2011, 01:24 PM
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is your BP-4W head fine? If that is the case, I think the most ideal would be the BP-Z3 block. Its whats in the mazdaspeed, and I think with some reading on the coolant porting, you will see thats not as prone to the hot cylinder 4 "issue" with miatas. If you aren't really planning to go FI, then this is no big deal anyway.

Personally, i would get an 94 block + ECU, use whatever head you like, but with the 94 OBDI setup you don't have to worry about the emissions crap with OBDII cars.
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Old 08-19-2011, 05:38 PM
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Originally Posted by Track View Post
is your BP-4W head fine? If that is the case, I think the most ideal would be the BP-Z3 block. Its whats in the mazdaspeed, and I think with some reading on the coolant porting, you will see thats not as prone to the hot cylinder 4 "issue" with miatas. If you aren't really planning to go FI, then this is no big deal anyway.

Personally, i would get an 94 block + ECU, use whatever head you like, but with the 94 OBDI setup you don't have to worry about the emissions crap with OBDII cars.
He has a 99 car.

And I believe that they didn't change the block casting but made two revisions to the locations of the water jacket holes in the BP engine to change the way water flowed through the block and head. The first revision, in 99, kept the water from shortcutting through the front of the engine and neglecting the rear. It closed off the holes in the front and made it take the longer route to the back of the block before moving into the head. The second revision, in 01, flowed more water past the exhaust ports to aid in cooling the exhaust valves, iirc. There is a large thread with pics of the HGs side by side for your inspection over on Miataturbo.net. The HG design change is why you don't need to do coolant reroutes on NBs.
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Old 08-19-2011, 05:41 PM
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Originally Posted by sixshooter View Post
He has a 99 car.

And I believe that they didn't change the block casting but made two revisions to the locations of the water jacket holes in the BP engine to change the way water flowed through the block and head. The first revision, in 99, kept the water from shortcutting through the front of the engine and neglecting the rear. It closed off the holes in the front and made it take the longer route to the back of the block before moving into the head. The second revision, in 01, flowed more water past the exhaust ports to aid in cooling the exhaust valves, iirc. There is a large thread with pics of the HGs side by side for your inspection over on Miataturbo.net. The HG design change is why you don't need to do coolant reroutes on NBs.
Thats not quite true.
http://forum.miata.net/vb/showthread.php?t=185985

Also, the changes are in the HG, not in the ports. You can see that in the thread above.
While it is not needed so much, it can still help a lot. Just have to pick up the right HG. But the mazdaspeed miatas got the best of it all...

There is one link I am forgetting, let me dig that up too.
EDIT: Here it is.
http://forum.miata.net/vb/showthread.php?t=350182

Last edited by Track; 08-19-2011 at 05:47 PM.
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Old 08-19-2011, 06:31 PM
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http://forum.miata.net/vb/showthread.php?t=350182 is the best thread on m.net for it.
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Old 08-19-2011, 06:41 PM
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Originally Posted by sixshooter View Post
http://forum.miata.net/vb/showthread.php?t=350182 is the best thread on m.net for it.
Glad we can agree on that!
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Old 08-22-2011, 07:08 PM
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I got my replacement 00' engine from FM salvage. Had it shipped from CO to Chicago in 3 days. I was running again within a week.

Moral of the story, ---- previous owners who don't do regular maintenance.
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