I got ahold of a 12a 6-port that has been rebuilt. Don't know the exact year, but is probably 81-83. I am putting it into an 85 GS. It looks like everything will swap out OK. I was planning on using my tranny on my 85. Does anyone know of any problems I might have, or should everything switch over OK? The 6-port has one less sending unit on the oil pan, so I plan on switching oil pans before I drop it in. Are the flywheels and clutch units the same?
TCS

 

Wow, a six port 12A. I've never heared of such a thing. Is it carbed or fueli ?
I wouldn't think there would be much of an advantage over a four port 12A, exept of course the rareness factor.

The extra sending unit on the oil pan is probably emissions related (hot start assist or somthing) I'm prety sure you could go without it.
As for the clutch and flywheel, they should be the same, unless there was a specific transmission for the car that came with the six port motor, what car was that anyway?



-- Alex

 

Are you sure its a 12a 6port and not a 13b 6 port? Look on the engine near the oil filler, ull see 12a or 13b.

 

Nope, it's a carburated 12a with a 6-port intake. Someone said that the engines had to be imported from Japan and that they weren't offered in cars sold in the USA. Since I have a RB header straight through to the muffler, I have to figure out how to get the actuators to function properly. I'm still working on that. Thanks for the info. It had a transmission with it and it looks like everything should switch over. Now I just have to figure out which sending unit is missing. I have another oilpan and I have to pull this one to replace the gasket while I have it out. I was going to paint the steel parts on the engine before installing it. Shouldn't a good engine enamel work on it OK. Thought I would put a couple of coats of primer on and about 3 costs of paint. I was going to go with black even though my car is red. I just don't care for the bright red on the engine. I bead blasted the oil beehive and the intake. They look pretty nice. Will a couple of coats of clear engine enamel keep them looking nice?
TCS

 

Yeah the 6PI motors weren't offered in NA. I'd love to get my hands on one though. I bet that they would just scream with a free-flowing exhaust and a Sterling Carb.

 

Like I said, I am going to have to figure out how to get the actuators functional since they were set up to work off of exhaust backpressure. Someone told me you could run them off of the air pump, but I don't want to run an AP. I could hook them up mechanically, if I know how. If anyone does let me know. I got the engine and tranny off of eBay for $200. It has rebuild tags on it, so I'm not sure how many miles are on it, but it is clean and dry. Can't wait to get things back together.
TCS

 

That is a smokin deal my freind, definatley remove the actuators untill you figure out what to do with them. my six port 13B runs all six ports all the time and still makes great low end power.

-- Alex

 

Yes, I dont think you need to lay it on that thick though.
Try doing a search, it seems like alot of people have been painting their engines lately.

-- Alex

 

For operating your '6'-ports via exhaust backpressure (the Mazda way), you can talk to Mazdatrix about ordering up their 13b SE-specific presilencer unit. This unit has the backpressure tube installed correctly with a funnel on the inside pointed toward the exhaust coming from the engine to correctly build the 2-4 psi required to operate the stock SE actuators on the 13b-RE-EGI engine at 3800 rpm.

This should work in your installation, as well.

 

ummm, great find on that 12a 6pt but you may be disappointed when you start to drive it. i doubt it will make any more horsepower than a standard 4 port. maybe rob will chime in and explain better why. i wanted to do this a while back. the kick *** thing though, is that it's rare as nawlz. good luck man.

 

Someone mentioned using a pump from an air suspension from a Lincoln or Caddy and somehow using it for the required air pressure. Don't know how this would exactly work. Maybe someone else has heard of this method.
TCS

 

If I wanted to retain 5th & 6th port actuation I would go this route, it sounds easier than the Lincon air pump thing and would be a cleaner (factory looking) install....


-- Alex

 

I'd much rather have a 4port...

If the motor is an 81-83, the flywheel and clutch will be different than yours. You'll need to get a good clutch that will work with the 6port motor's flywheel, can't swap flywheels since they have different counterweights.

 

So what would be the main differences between the flywheels? I noticed the pilot bearings are the same. Is the thickness and the diameter different between the two?
Todd