nick812

OK well i am going to be building a full bridge 12A or 13B 4port still kinda in te air. Most likly going to be 12A.

nick812

yea air craft people use some crazy stuff i bet that is where i saw it on 1 of those sites.

DriveFast7

iTrader: (1)

There are manifolds out there to run dual 40mm 2bbl sidedrafts. 40DCOE is most popular carb, can also do 40DHLA or 40PPH. twminduction.com made the manifolds but last I heard they have no more.

A few years ago http://www.racetep.com/weber.html said they still sold the dual 2bbl carb kit.

I have a full bridge 12a and I would not say it's streetable. Engine kick and bucks under 4000rpms and / or on light throttle.

51mmIDA is the traditional carb for such a motor.

nick812

yea but i would need something with a choke.

trochoid

iTrader: (6)

Trust me, a 1/2bp is bad enough on the street, no way would I try to drive a full bridge. You'ld be better off going with a 13B and a large street port if you plan on DDing the car.

nick812

i have heard bad things about 1/2 bridge. I ve driven a 12A street ported gonna try and drive a friends 1/2 bridged 13 b 4port. Also drove another friends full bridged 13b.

trochoid

iTrader: (6)

What 'bad' have you heard? Each port drives/performs differently. You should decide how you plan on using the car and what you are willing to put up with in the way of driveability before deciding on the type of porting you want.

nick812

Ok right now the 12A is leading the way bc i have so many 12A parts and a full racing beat exhust and of course a mukuni carb and intake also holley blue fuel pump and holley fpr. I All ready got a 3rd gen opr. Front mount oil cooler. Eshaft oil jet mod and oil cavaty porting. Some other stuff still up in the air.

rotaryengineering

I have built a couple of Bridge Ports for everyday street driving and they work well, but you have muffle the noise level down to make it driveable. I used to street race many years ago and I would race Bridge Ports/P-Ports against my Street Port and kick their asses up and down the street. In order for a Bridge/P-Port to make good power you have to un-cork them or run a exhaust system that is not restrictive.

If your building a Street Car use a 13B Street Port they idle nice and clean and drive just as good as a stock engine with a ton of horsepower to run on the street. The bad side to making big power is alot of noise and then you start braking sh?t. Which is not fun for a street car and your wallet. Not to mention the fix it tickets you can accumulate rather quickly with a loud un-corked Rotary.

Good Luck

t_g_farrell

iTrader: (1)

Heres the page with the dual DCDs from the 1991 Rotary Engineering catalog.

steve84GS TII

Agreed.
I loved my stockport 13B 4 port with a light flywheel and Yaw Nikki.
Even without any porting,it kicked the **** outta my 12A's.Much more torque,just better pull all around,and it didnt have to be loud to do it.


Funny were talking about dual carbs and what-not...........

I had some old tweeker come into my work today and start asking me if I thought my car was quick.....he then proceeded to tell me 480 times that he used to have an RX-7 10-15 years ago with a "3 puck" engine.....he said it over and over,so I just shrugged and said,"What the hell are you talking about!!??"
He then started telling me about the DUAL 4 barrel carbs that it ran......yea......OK!
I asked him if it was a 12A or 13B....."It was a 3 puck!"
I asked him if it was a brideport......"It was a 3 puck!"

Gotta love them deranged,toothless drug addicts!!

aussiesmg

iTrader: (1)

When I installed my 13B BP into my RX3 it was still a street car, that lasted about a month, it was hell at 35 mph, but bliss at anything over 75 mph, you do the math.

nick812

Ok so a Large street port HMM!!!! Still kinda upo in the air i have the chance to by a s5 motor with blown seals. But still almost all my parts are 4 the12A. Also if i go 13B it is gonna be carb. Thanks for all the replays makes me really think.

rotarycrazy

iTrader: (8)

I know one thing a 4 port 13B SP light flywheel and a 465cfm holley makes 240BHP so around 205rwhp and put that into an SA and you have recepy for a speeding tickets lots of them.

rxtasy3

iTrader: (2)

sounds exactly like what i'm running, except i have the 600cfm holley.

nick812

ok check out what i found on ebay http://cgi.ebay.com/ebaymotors/1979-...QQcmdZViewItem I love this car i wish i had the money to buy her. lol needs some paint dont you think?

nick812

OK i am bumping this bc i would still like to see the dual side draft dellorto. Does any1 have this on there car?

t_g_farrell

iTrader: (1)

Uh, you mean dual side draft webers right ? Dual dells would be pretty rare i would imagine.

nick812

I have seen dual dellorto's i belive it was on a 13B not for sure I am thinking about running dual mikuni. thats why i was looking for the dual dellorto dhla 48. I am i wrong I could have dreamed it not really sure. Some body let me know if this was a dream?

t_g_farrell

iTrader: (1)

You could put dual dells on a mainifold used for dual webers as they share the same foot print.

Dual 48s would be way too much unless you do a bunch of porting. Even the single 48 uses a smaller choke on a stock port 12A. Thats why the RE dcd setup just uses dual Weber 36 DCDs.

fivehunsky

I hate to dig up an old thread.. But I am about to try to put my dual mikuni solex 40's on a stock 12a.. How bad of an idea is this?

Its gonna be driven on the street every once in a while.. and I honestly dont care if it has to have an insane high idle.. I just need to do something with these things besides looking at them every day.. and I found a good deal on a manifold..

The car is going to be my drifter as well.. So thats what the build is focusing on.. I dont mind having it run funny on the street if it kicks *** at the events.. haha

If someone has run them do you have jet specs?

trochoid

iTrader: (6)

Can't say I've seen that setup, you need to post pics. Porting and exhaust make a big difference on jetting, what is yours'?

fivehunsky

I will post some pics after I get it installed. Im in the process of cleaning up the carbs right now and the intake wont be in till next week.

I will take some pics and tell everyone how it runs shortly after that..

Hopefully the jets that are in the carbs will work.. I dont really want to have to play around with it for too long.. especially since I dont have any more jets and would have to order them..

Like I said above tho.. this is a completely stock internally 12a.. The only mods done are as follows:

The stock exhuast was removed by the previous owner from the cat back.. there is no cat now.. just pipe and an aftermarket muffler
I also have an msd 6al running the 3 coil ignition.. Hopefully I can afford another one soon and then I will have a 4 coil ignition.. yay!!


Thats it.. no other mods.. the engine has 117k miles on it and runs pretty good.. smokes a bit when you rev it tho.. but other than that its great.. I just want to make it better for now.. Until I can afford to get a street ported engine..

tten

Hi,

Obviously I'am new to this site, and still trying to learn... But just to let everyone know... I have seen a dual weber 40 or 45 sidedraft on a gsl-se. But I believe it was a 4 port 13b instead of the original traditional 6 port.

I was in the process of raising up money to actually buy the car, since it was the same color as my own car, anyways to make a long story short, a co-worker of mine ended buying the car behind my back

I believe this is what you are looking for, am I right???

fivehunsky

Yeah.. I had two solex 40's that I had bought for one of my datsun projects and then I accidentally found an intake online (ebay) for them that would let me put them on the rx7..

Im starting blind here with no one else running them.. Where did you find that pic? who makes that kit? If you could get me some info that would be great.. I need to ask them about jetting specs..