there are two different ones, like the miata, there's a slotted belt drive and a v-notch belt drive alternator for the FD and FC respectively.

both need different lower bolts.


1.8 miata:



rx7 (100A)


kia (90A)





1.8 miata (65A)




rx7 (100A)


kia (90A)

'



the kia one looks pretty promising, and can be had for $100 brand new -- no core, and not remanufactured.


FWIW, on these three spec sheets, it says the miata alt is 12.1lbs, rx7 is 12.7lbs, and kia is 13.4lbs.

 

From thread: https://www.miataturbo.net/build-thr...2/#post1358144

 

The FC alternator does? Its a different pulley

 

FC for 1.6L. FD for 1.8L.

 

Does anyone know if the pulleys interchange?

 

elaborate.

i think the difference in the size of the pulleys is part of how you can achieve greater amperage.

 

I have a 3 month old FC alternator for my 1.6. Am in the process of installing a 1.8.

Don't want to buy new alternator, need new pulley.

 

im pretty sure you can. i remember reading someone doing that back in like 2006. but dont quote me on that.

 

I might measure pulleys.

Or i might get too lazy again and keep asking people on the internet if theyve done it.

 

Swapping Alternator Pulley 1.8 to 1.6 - MX-5 Miata Forum

 

Bob did it, good enough for me.

 

What are you doing that you need extra current for? Isn't this a track car?

--Ian

 

Its for my 12"s in the trunk on the way to the track.

(this car also gets daily'd quite often when not smoking like cheech and chong)

 

1.6L alternators are a ******* joke.

if I ran my headlights and a/c at the same time, I could watch my voltage drop over time at idle.

 

Poor engine couldn't keep up :'(

 

I've been running a Suzuki Samurai alternator. its rated for 70 amps which is more than a stock 1.6l alternator but its significantly lighter with less rotating mass than a Miata part however. bit of fiddling to get it to fit. pulley is a unorthodox aluminum one for a eclipse I think and I found the right electrical connectors to make an adapter to plug it in directly to the stock NA wiring and since its smaller it needs some customizing of the tensioner. It's been trouble free with a tiny LiFePO4 battery but I don't have AC or radio just a power hungry fuel pump, injectors, and voltage sensitive Hydra.

 

anybody ever use one of these? Got one from a guy who sold his car before he ever installed it.

1993-1992 1991 Mazda MX5 Miata 1.6L w/ MT NEW HD 130 HIGH AMP ALTERNATOR

 

lol,I take that to mean NOOOO! Anyone see anything wrong with it? If not I plan on running a bigger wire from battery to alternator with maybe a 100A fuse,to eliminate voltage drop when ac and fans come on. And yes I still have the V belt. Be nice to change that though.

 

Just pick up a used water pump pulley and crank pulley. Shouldn't be difficult at all. I suppose the only tricky bit is ensuring they didn't cheap out on the regulator