I'm putting in a SP 13B out of an S5. I want to carb it. I have the racing beat SP exhaust. I would prefer a side draft carb, because I like the way it looks better than the upright webers.

What kind of carb would you guys recommend? More importantly, what size? 48, 51, 40DCOE, I don't understand any of that ****. I just want something that will make good power, not constantly need adjusting, and is pretty straight forward to install.

 

First off all let me tell you, (this is just IMO) you will never get a weber to run right without a MASSIVE amount of tuning. To give you an idea of what im talking about, ive been trying to jet mine just so for about 6 months now. It is a long process because I order jets, have to wait for them in the mail, and then find out they didn't do what I wanted lol...

Your best bet is probally a weber 48dcoe for your setup. But in all honesty I think that it would be cool to go for the downdraft. You should make more power with a downdraft and the streetported 13B, but the powerband will be at higher rpms. With a sidedraft (at least in my experience) shifted my powerband to about 4-6k rpms.

Webers are badass carbs I like mine, except for it sucks down the gas, no choke, constant jetting... but on the up side: sounds badass (has a loud grunt to it), makes a massive power difference, easy to tear appart, look cool. But if you as me, you basically trade off daily drivability for performance in a way, unless you get it tuned perfectily.

 

SU

 

I don't really need to worry about daily drivability, as this is one of my "fun" cars. Is the 48dcoe a sidedraft? Can I use any 48dcoe off of Ebay or whatever, or do I need some special Racing Beat carb?

 

DCOE is a sidedraft. I believe it does have a built in choke. I like the choice of the 48 size. The IDA as Dan said will give you the most power, but the DCOE is a good street carb. You'll just need a good fuel pump. (I use a carter) and a FPR. Ebay has them all the time.

 

Racing Beat Holley.

 

Mikuni 44 !!!!!!!!!http://cgi.ebay.com/ebaymotors/Mikun...QQcmdZViewItem

 

Go the 48 IDA....tuning is NOT THAT HARD! Before you start jetting wildly, ask around, find a good baseline and buy two jet sizes larger and smaller. Spending money on useless jets just plain sucks and can be costly, luckily they are pretty easy to find around L.A. I've been playing with the tune a few months and have gotten quite good at it. I've never had to re-adjust anything, set it and forget it...until you make major engine changes!

Current set-up (pulls like a bastard!): 48 IDA
40 mm chokes
F-11 emulsion tubes
230 main
210 air
120 idle holders w/ 70 idle jet

My mileage is pretty damn good for a big SP and IDA....I can drive normally (some crusing and some WOT runs) and fill the tank in my Rx2 every 4 days...., maybe 18 mpg, not bad actually. Since it never really gets below 50 degrees in L.A., I have never had a problem waking up and just driving off, it bucks a bit till warm, but so do most ported rotaries.

If you take a serious look at cost, the sidedraft is not much cheaper if cheaper at all than an IDA set-up. Over the top carbs also mean more heatsinkfrom being so close to the engine...at least you can shield the IDA a little easier. Check ebay for the older italian versions...you can often pick up 2 (for a bug) at a bargain, sell one, and buy the rest of the setup with the profit!

Trust me...you will not be disappointed.

 

Just to be fully clear, this is a streetported 6-port 13B, correct?

 

Yep.

 

Which you just happen to be selling...

 

from what i hear mikuni and weber are the best i would go with a weber but i dont kow what size would be best for you

 

44's are too small anyway. Go with a 48IDA. They make great power and changing jets, venturis etc takes about 5 mins.

 

That's the upright one, right? I want sidedraft.

 

Why?

 

 

^ Exactly.

Plus, the guy who got me into 7s way back in the day had a 13B with a Dellorto, and it was just the coolest ******* thing ever... I want to duplicate his kind of performance... He had a SP, full RB exhaust, Dellorto, and N2O. I don't know if I'll go nitrous like he did, but I just might.

 

a weber 48DCO would do you good

its a sidedraft you could get a DCOE if you want a choke

Contact robert at rotary shack, he does great work.

 

Just be prepared to wait. Robert isn't known for prompt service.

 

Yes I'm selling it. Have 3 of them and I love them! Best carbs on the planet along with Weber and Dellorto! I have it on a Large SP 12a, RB headers and RB muffler. Scary fast! I'm old school so I dont care about NOS and turbo's on my cars but before you invest on your "right carb" make sure your motor was rebuilt right. I've bought many "rebuilt motors only to later open them up and find the real reason behind the sale. I've gotten good at rebuilding motors because of this.....lol. Just a little info!

 

sux you are dead set on a side draft... a 48IDA would own!!!!

 

Yep...look what's on my new motor.

 

I got my 48DCO 3 days after ordering it from him

 

Yeah, IDA's look ****. Who cares about peformance anyway.

 

damn, why's that carb so fugly?