anyone know were i can get some parts to put an edelbrock 750 carb on my 12a

 

a 750 might me a little much unless you plan on a huge port or blowthrough,

 

probablly im gonna go big i might jet it down for a while but eventually im gonna attleast do a 50 shot and maybe a supercharger if i can. it will be high flow for sure a lot of power out of something small

 

750 was too big for my cousin's supercharged mild-ported 13B. It ran far better with the 600 he replaced it with.

 

u'll never get a 750 jetted down enough to run well on a 12a. but to answer ur question, there's quite a few RB and Jay Tech intakes that pop up from time to time on ebay. but then again, i know how some ppl feel about ebay. do a search here and u may find someone that had one for sale and still has it.

 

The 750 is too big. I'd like to trade mine for a 600.

 

I have a 500cfm and its purrrrrrfect on my 12a.

 

I have 2 Holleys and intakes, 600 and 650, in the 1st gen parts for sale section.

 

4bbl = no good on rotary.
find yourself a nice weber, dellorto, or mikuni.

your from ottawa??
you know about the meet next weekend??
https://www.rx7club.com/midwest-rx-7-forum-32/lawrence-ks-spring-rotary-meet-637645/

 

What do you mean 4BBL are no good for a rotary? What do you think they came with. A good modified Nikki or sterling carb works well on alot of applications. :-)

 

personally i would seek alternatives.
but for the record modified nikkis are ok.

 

How do you back up this statement? Do you have proof that 4bbl carbs are no good? How about some dyno numbers mabey? If tuned right, a 4bbl will be just as good as a weber or dellorto or mikuni.

Also, I have the Jay-Tech intake, and it is awsome so far. It is a tall intake though, think long runners, but the nice thing about it is that it will probably clear a turbo perfectly fine. The problem is in picking an air cleaner to go on it. I've got a 10" round with 2" element and it just barely clears the hood with my Edelbrock performer carb.

 

i have always loved 4bbl carbs over the weber's... much better street manners and still great top end power

 

He was just stating his personal opinion on the subject.
He prefers the alternative style carbs is all.

They are all good if tuned properly but some just make more Hp than others and are easier to tune. :-)

 

yea i have a lot of experience with holleys and nikkis.
2bbl carbs are easier to tune, easier to rebuild, smoother power ( no secondaries), and they look better .
plus they make more sense. you got 2 rotors, 2 headers, going to 2bbl's.

actually if your going for all out h.p. #'s you should use a holley, at least according to racing beat they will give you more h.p.
compared to sidedrafts at least, i dont know how they match up with the ida's..?

 

in my short experience with edelbrocks, they have too much vacuum related restrictions in them, to make a one size fits all style carb. They utilize high vacuum to gauge the cfm for the different size engines. rotary, very low vacuum, piston suck like crazy! Ha, ha ! ! !

Holley pain in the *** to tune, but all ***** when wide open! and low restrictions in the air flow, unlike edels

 

Still dollar for dollar you'll get more bang for the buck w/ an Edelbrock.

 

ill probably jet it down and run a 50 shot. but it is a vacum secondary i dont know if that will make a difference. i got it for $250 and had only been ran for like 10 hours

 

you're not listening!!!!!!! IT"S TOOO DAMN BIG!!! it's not about jetting down, it's about air velocity/flow. Sure you can put it on your 12a... but it's going to run like ****. A stockport 12a a 100% volumetric efficiency only flows something like 450 cfm.... thus putting a carb with nearly double the flow capacity is going to give you poor air velocity, which leads to poor fuel atomization dificult tunning and all around poor performance. Now I'm going to have to be the one to tell you SELL THE 750!!! And buy something smaller if you'd like to run an EDDIE then as Latin said a 500 is about the perfect size, and if you prefer to use a diferent carb then most can be had, used, for 250 dollars. Save yourself the headache/heartache, and the money, and get a smaller carb.

 

i understand that. but cant you open up the port have it machined if you can the 750 might work but it is probably to big still

 

The 750 is too big for a full J-bridgeport 13B, let alone a stockport 12A. Get the picture yet? No amount of porting, intake or engine, will allow this big of a carb to work efficiently, period.

Put it up for sale on eBay and find something more appropriate.

 

Kinda looks like a Nikki:



Maybe the Mazda engineers had a clue in the first place.

 

yeah my 600 is too big so before i even throw it on there i have to tune it down a bit, but its only a little too big unlike yours. I just remembered that they have fogger kits for edelbrock carbs. Yummy. haha. Anyways, there is a how to somewhere on here that shows you how to tune a 600 down, but a 750 is way way to much. A 750 is what they use on big block v8s that run 600 hp. Just a little too big, even for us fuel eaters.

 

In response to “4 barrels no good for rotary”, this person obviously does not know what they are talking about. Speaking from experience and “factual data” the right size 4 barrel will all around out perform any 2 barrel carb every day and twice on Sunday. (Don’t over carb the motor, a nicely jetted 550cfm carb will perform great on a ported 13b)

A four barrel can be tuned for a wider driving rang and give more max power than a 2 barrel and the gas mileage is comparable to EFI (if your not always on it). Two barrels do perform well but are more suited for race only apps where consistent WOT is the main focus (and of course gas mileage SUCKS, because the are tuned for one app WOT)

Don’t believe me read this adobe article by TWM Carb vs. Fuel injection
Test subject was a 13b 6 port using:
TWM 50mm fuel injected 2 barrel Throttle Body
Dellorto 48 side draft carb
Holley 4 barrel (size unknown)

http://www.twminduction.com/faq/faq-FR.html

Page 4 Dyno results

Holley 224 @ 8400rpm
TWM Haltech EFI 226 @ 8200rpm
Dellorto 211 @ 8100rpm
Mikuni 207 @7900rpm

 

lol.....did you hear them .... its too big.