I have a 13B streetported 4 port with S5 N/A rotating assy in my SA. I don't like the RB holley setup i have. What carb setup should i try out?

 

Try an Edelbrock 600 cfm carb. Bolts right up in place of the the holley and I've heard they work quite well. Rotaries even run well on the setup the edelbrocks come with. Thats what I'm putting on my 6 port.

 

I had a Yaw Nikki on my 13B 4port.It was an awesome setup,very responsive and smooth.Still went strong up to redline,even though the carb was originally setup for a 12A.I just upped the secondary jets a size and it ran flawlessley.No hiccups,no bogging,no nothing...just smooth,easy power at all revs and loads.

Since Yaw carbs are few and far between these days,Id call Sterling about a modded Nikki.He does much of the same mods that Yaw did,except with better tech support and customer relations.Ive no doubt he could set one up for a 13B,and if it works anywhere near as well as my Yaw,youll love it.

 

try a sidedraft carb, and add some boost if you get bored with that!!! try some, mikee did and he liked it!!!

 

Weber 48IDA, without question.

 

I run an edelbrock on my s/c, it works great. Remember to pick a thunder series 650 carb, it has adjustable secondaries. You'll like the mech secondaries over a holley by far. Tuneability is a snap, change metering rods in about a minute rather than rejetting a holley.

 

I ran a Mikuni 44PPH on my street ported 13B 4 port before I lost a coolant seal, and it was an incredible carb. It can be a little finiky (sp) with tuning, but it isn't too bad. I would definately recommend one.

 

JUNK THEM ALL!!! and buy a 48 IDA. This carb is good from stock to p-port application, easy to tune, and the jets can easily be replaced. So you only have to buy it once!!!

IDA's are good for display also. All others are usually buried under something and are collecting RUST or they are used as ...

 

If you use the Edelbrock, I assume you would have to put some oil metering ports in the carb or the manifold somewhere, unless you are using GSL-SE rotor housings. I think Racing Beat always put the oil lines into the throats on the Holleys they modify, but I can't remember if they were in the primaries or the secondaries.

I like the Edelbrock 600, got one in my 1984 GSL, runs very smoothly, once I got it jetted correctly. I can outrun just about any RX-7 I come across. Of course, that may not be entirely due to the carb.

Photo attached.

 

too bad it's hard as hell to boost prep an edlebrock.

 

Bah, who needs boost preping when you can put a camden supercharger under it. Drawthrough doesn't need any preping.

 

lol, costs too much. ;-) altho, i would like to know if you bought a kit or just got the intake manifold.

 

Steve... It's RSDEVIL from MAZSPEED. I'm having nothing but problems with the YAW carb... It's far from responsive, it drips fuel out of each barrel whenever it feels like it which eventually causes it to sputter and stall... Pulling up to redline feels slower then my mothers corolla filled with 7 passangers... The transition of opening the secondaries is laggy when I floor it and it completly falls on it's face for a full second before whinning to nowhere fast. I read how amazing it ran for you all the time and I can only wonder what you are talking about...???? I purely believe something is wrong with the install on my end because of how perfect I keep hearing it ran for you. So it's been to the shop 3x's since I put the set-up in to try to correct the problems but to no avail. My air fuel meter is deep into the rich on idle and under throttle. I dropped it off again to Smokey Joe a local rotary guy to set my timing b/c it was over towards the passanger side and I couldn't get it to come into normal positon... he told me the pulley was not the right one for the motor and I bought a RB pulley... so now the timing is finally set right and it still feels crappy...???? so I dropped it off to him today again b/c of the dripping that sparaticly keeps happening out of all four barrells...??? I'm far from loving it. When it's not dripping it feels somewhat good but NOTHING like my Dellorto w/the 6port...??? Maybe I'm expecting tooo much...??? Did you have a Air/Fuel ratio meter...??? Sorry for hijacking the thread.

 

All I can say is perhaps the carb varnished from sitting.I did drain it before storage.Either that,or your altitude/climate is just too different.It was tuned for warm weather and sea level.
Its odd,but I SWEAR that carb worked absolutely flawless for me the whole time I had it,on both the 12A and the 13B I sold you.I normally dont like carbs being an EFI guy,but that Yaw carb was just incredible.

....strange.......

 

I think i will just go for a S5 TII or cosmo -re swap after 7stock.. or might even try a rotary shack blow-through setup..

 

yes, just do a turbo blow thru setup on your current motor! you'll make more power for less money than getting a whole s5tii conversion. WOOOT

 

just listen to wackyracer. ive never been disappointed w my IDAS. NEVER!

 

I got my car back today. Smokey Joe rebuilt the carb and reset the floats with a new needle and seat. When we put it back together the fuel pressure jumped up to 5 psi when it was orginally set at 3. So I then lowered it to 2.5 psi b/c I read Hanmans post where he said he was running 2.5 psi on his YAW. I took it for a ride and WO'... I finally felt what you've been talking about.

So I have the timing set correct. The flooding and spilling of fuel problem solved... It idles beautiful...

but, hopefully the last issue I'm having with it is... when I mash the pedal and the secondaries open up it hesitates for a sec before feeling any pull. Also I noticed the air fuel meter is still deep into the rich area. Do you think the two are related...???

 

I did play around with the secondary spring,but ended up going back to Paul's intial setting(like almost all the other settings,he got it right the first time)
What exhaust and intake/air cleaner you running?
The hesitation might just be the change in environment,whats your altitude?Im at sea level and its always in the 50-70 range around here with mild/moderate humidity.I also ran best on 2-3psi fuel pressure.(Carter pump)
Im glad you got it sorted out.I was baffled for a while and I hoped you wouldnt give up,because that carb was a real kick in the pants on both my engines.

 

The exhaust is the RB header and presilencer for a GSL-SE, (the header you gave me, I bought the presilencer from RB new). and the air cleaner is a K&N with the stock Mazda canister (the blue one).

How the heck do I find out my altitude... I guess I'll google it. And it's 73 degrees right now since it's the first few days of fall.

I have a Holley Blue pump.... and I'm going to play with the bag of jets u gave me at the track next week... see if I can sort it out.

 

Sounds like your "in-out" is the same setup as what I ran.
If your near the ocean then temp,humidity and altitude sould also be similar to me.
Are you running MSD direct fire and Yaw spec timing advance?

 

No.. I'm not running the MSD yet. I have a 85 distributor in there with MSD blaster coils and MSD wires with the Nippon Denso plugs you reccomended. I still have the distributor you gave me, just not using it yet.

Dammm I forgot what Smokey Joe said he set the timing at. I'll have to ask him again or check it myself.

 

I have a Weber 48 IDA, PM me if intrested. Carl

 

You know all the SCCA guys are dumping the MSD's. For peak power, a streeported 12a with a 48IDA will have more power with the stock ignition. Now driveability is another matter. I have no proof but other than what I've been told. There will be a lot of used MSD's available this offseason.

I agree with wacky and blake go 48IDA. I got mine form Carl as well.