ok i have a 83 rx7 with a 12a it has a 4 barrel 1406 edelbrock, i dont know if the stock jets are too big or what the problem is, it will tun over and idle around 750-1000 rpm the car can sit and idle with no problem but when i take it for a cruse around the block and stop at a stop sign it will bog down and die and it will just crank over and not start.

 

Its probably flooding on decel and getting too rich which kills it and then being flooded it doesn't
want to start easily. Probably stock ignition on too.

You have a project!

 

what do i have to do to fix the problem ?

 

Interesting, had the same problem this morning with my GSL. Interested in learning how to prevent this.

 

An Edelbrock will do this on a rotary because it is turned 90 degrees from what it would have been on a V8. So you have to keep it running with your foot any time you slow down and turn left or just slow down fast. If you can catch it with the gas pedal, it will stay running for you.

 

ok thank you

 

Will it be simpler to just put a 2 barrel carburetor on it

 

No. First you have to pull the current Edelbrock and manifold. That takes a bit of work. Then you have to sell it to afford a 2bbl carb like a weber and new 2bbl manifold. Then you have to install them and hope you can get it started on whatever jets/air bleeds the weber came with. Then you have to tune the weber. The tuning parts alone can cost more than the carb itself. Then you have to spend time tuning it. Lots of time. You will also need a new free flowing exhaust, unless you already have one, and it will require a wideband O2 bung installed. Then you can use the wideband to tune the weber. Or you can skip the wideband and do it like the older generation who relied on spark plug reading and tail pipe reading.

Are you prepared for all of that?

I personally don't like 2bbl carbs on a rotary unless you have a reason such as a peripheral port. And that is way out there, even for the more accomplished amoung us (like fungus mungus and j9fd3s).

Your best bet is and always has been the carb that originally came with the 12A. The Nikki! But it needs some mods to run and drive better than stock, which is what I've been up to for the past month.

I know I'm biased but for good reason. These carbs don't flood out when you slow down and turn left, and they are easy to modify and tune if you understand a few basics like me and wankel=awesome, to give two recent examples. His carb is totally amazing on a stockport 12A and is WAY better than the Holley he used to run.

It can be argued that an Edelbrock is similar to a Holley on a rotary, both needing to be rotated 90 degrees and both tend to have similar problems due to this. Also the way a V8 carb runs on a separate runner manifold with the strong reversion pulses of a rotary compared to the generally smoother signal an open plenum or dual plane manifold, like on a typical V8, causes issues with the V8 carb's various circuits; all the starting and stopping of the vacuum signal.

To combat this, Racing Beat has extensively modified their Holleys to put up with it. And then wankel=awesome would argue that it wasn't nearly enough and that the Holley will never run all that well on a rotary, period.

Or that's the general idea. I tend to not really pay all that much attention to other carbs these days because it helps keep me focused on the best running carb a rotary has ever had, the Nikki! And helps me learn how to mod them further to make them better than stock. Even better than factory EFI, and that's saying something.

This is not an advertisement. I'm not interested in selling any carbs I've modified because I'm a little short on carbs around here as it is. I know you car's orignal Nikki is long gone so I'd suggest staying with the Edelbrock and learning how to drive it for now. Then learn all you can about every other setup and decide what appeals to you.

 

thank you jeff20b for you information and input it helps out a lot, i will try and find an original carb and intake, i honestly don't care about getting max hp. i just want to take the car on long drives and not have to worry about it failing in the middle of nowhere's, this is my first rotary motor and i have no clue about them and all i have been doing is going though the forums and reading as much as i can to under stand how they work, to get a general idea

 

You need a nikki then!

 

ok so i found a remand nikki carb, i will post the link, will i be able to bolt it on to my intake i have a racing beat intake on it. here is the link for the carb good buy ? http://www.summitracing.com/parts/ur..._7hRoCjqjw_wcB

 

The carb in the summit link is not an RX-7 Nikki. Rx-7 12A carbs are 4 barrel. The link says theirs is a 2 barrel. Also make sure you get one that's specific for your year car if you can.

 

That RB manifold is meant to fit holleys. You need a stock intake manifold to go with that nikki
you want.

 

okay thank you

 

ok so i bought a stock nikki and intake, what hooks up to the intake back and front ? i have no air pump in my car it came with out it, im am now lost on what i have to do

 

what connects to the last 2 photos