Hello all

Does anyone here have a 6port 12A manifold that they want to sell?

i think they came on Jspec 12A's from 1981-85..i think.
Sorry that i had to post this here but its such a rare part that i need most exposure.

Thanks
Jon

God BLess

 

a 6port 12a?....or a 6 port 13b u mean? j-spec or not im pretty sure its 4 port

 

Just helping your post out , this is the 6 port, it came in 81-85 rx7 and cosmos' (?)... it was not availibe in the states but they are here none the less.

 

Holy crap Batman! Just when you thought you knew everything about Rotarys, BAM! Something like this happens!

 

i have one

 

there is a breather cover on ebay right now ... (in australia)

 

that pic was worth for that air filter assembly alone. holy ****! thanks, vipergts 3.

 

+1

totally astonishing

 

Where have you guys been. Jeff20B posted one in his long engine thread.

 

Yea and I posted one i found on ebay a couple of days ago. Man and FYI i belive the 6 port has a HP output of 135hp in case a you wanna know.

 

The best advice I can give is to accept that that will happen to you many more times.

 

I don't know about that. The GSL-SE RE-EGI had 135HP and 133 torque. Since the 12A had smaller ports and smaller rotors without EFI, I'd have to say its output was lower.

Hmm, just speculating here, but perhaps it did peak up to 135HP, but the torque would have been lower than the 6 port 13B. Does that sound right to everyone?

 

Well, for some unkown reason, all of the jspec engines seem to have more net hp than the usdm ones. I have heard a higher figure on the 12A 6-ports, but I don't recall what it is. Perhaps someone on the European forum would know as they got the 6-ports, along with the Aussies.

I wonder how that engine would perform with an sp on the primarys and secondarys, with a bridge on the aux ports? There's another idea for your experiments Jeff.

 

If you read here, http://cp_www.tripod.com/rotary/pg18.htm it mostly talks about the 12A turbo. Read closely for the 6 port 12A information. Some of the text appears to be an excerpt from the 'Yamaguchi book'. The carbed 6 port 12A is referenced a few times. Too bad he didn't exerpt the 6 port 12A info as well.

 

I think I know the reason(s). Larger exhaust ports with different timing, different jets and air bleeds in the carbs, later intake closing (up to 50° in EU-spec engines), and even different mechanical advance curves on some models. Yes, the little weights down in the bowels of the dizzy had slots with an interesting curve compared to our straight slotted 12A dizzies or the slightly curved GSL-SE dizzies.

The problem with porting a 6 port 12A is the front and rear plates have oval shaped runners below the round aux runners. The port timing closes at 40° like US-spec 12As, but may not allow much porting beyond that, the manifold is set up in an unknown way (I have not had a chance to look into it), the porting would have to be compatible with the flow capabilities of a Nikki, which having not examined it yet, I have no idea how it's set up.

It's cool to think about, but if I was to build up my friend's 6 port 12A, it would have to retain its 6 port functionality. It would go into a project car that would benefit from these unique features. The length of a 12A with the low end of a 13B, but the high end of a 6 port.

Oh yeah, his manifold is lacking the aux port actuators. I'd hope GSL-SE units would work. Otherwise they'd have to be wired open which would kill the low end and pervert the reasons for taking on the project in the first place.

 

the 6Port 12-A had penut size ports where the SE had a huge port.... I will post a pick here of what I am talking about so you all can see it..

Dan

 

yeah the guy wount sell anything off the motor (already asked)... hopefully my girlfreind will realise i was a good boy and get the motor for me hehehehe.
have never seen the ports (as well as most of us) .