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Discussion Starter #1
Hey guys. Newer here just a quick question i haven't been able to find a straight answer to.
I just installed a new alternator on my 1990 1.6
I have a 1.8 from a 94-97, not positive of the year, waiting to be swapped into my chassis. (just need a few more bits and pieces)
Once i swap in the 1.8 can i use my brand new 1990 1.6 alternator on the 1.8? I figure i spent 100 bucks on the damn thing, might as well use it lol.
If so what exactly do i need to swap/convert over? Thanks for any and all help guys
 

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I ran a BP alternator on my B6. Everything bolted up perfectly fine, belts mounts, etc. There is NO regulator on the BP alternator, the B6 alternator states clearly that there is regulator inside, and the BP one doesnt. I ran it for about 1,000kms. It worked fine, but my battery died shortly after. Im not sure if I was overcharging the battery, or anything like that. But it seemed to have negative effects on the battery. My recommendation is to not run anything other then a B6 alternator (factory) on the car.
 

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brontosaurus
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99-05 alternator is the unregulated one.

The short nose crank pulley 1.6 uses a different belt, so the alternator wont be compatible with the long nose 1.6 or the 1.8s from 94-97.

if you have a long nose 1.6 you can slap on the water pump pulley and crank pulley on to the 94-97 1.8 no problem and use the long nose crank 1.6 alternator.

You should have a short nose crank though, unless something was done along the line. So no go for you. Bummer.

This all outlined in every 1.8 swap guide. C'mon guys! Looking at you project g, you guys sell parts!;)

http://www.flyinmiata.com/tech/1.8_conversion.php
 

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brontosaurus
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http://forum.miata.net/vb/showthread.php?t=279930

I can't find a clear example of it. Sorry I have never tried. Never bought a new alternator, never owned a short nose. Sounds doable, but I am no where near sure.

When it comes time to swap, try it out? You now have both alternators.
 

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Discussion Starter #9
Thanks man. I just have people i know sayin you can and then others saying no you can't so im just not sure lol. The reason i'm kind of convinced you can is because i've been told you can swap 91-93 alternator onto a 94-97. Even though mine is a 1990 its the same part number as a 91-93 alternator so i figure why not you know? Sorry im draggin this out i just wanna save 100 bucks lol.
 

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brontosaurus
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I imagine a strap wrench and an impact should make quick work of the pulleys. Good luck. Make sur to come back and let us know if it worked. Might help someone out later.
 

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Discussion Starter #11
For sure i will. Thanks for all the help. I mean in theory if the pulleys are swappable (which they all have nuts on em so why not? Lol) i dont see why it wouldnt work. In theory at least. It'll be a bit but once i swap motors i'll do it. I still need the flyin miata kit and a 1.8 header
 
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