I've been through 6 pages of threads on the subject and think I've formed an opinion. However, I would like some thoughts on the flexibility of these three carbs with respect to porting. Right now my engine is stock (RB exhaust system and better coils are the only mods) and stock it will stay that way for a while...but I would like to street port the engine in the future. So my question is which of these three set-ups would be best for a stock port now and a street port later? Does such a solution exist?

 

good question, hopefully someone with more insight than me will reply...heh

 

If you're racing and it calls for a stock carb, then go with the YawPower carb, but don't hold your breath waiting for delivery...if you want a carb that has a ton of info and aftermarket support, then go with the Holley for an all-around performer...if it's ultimate top-end power you want then go with the Webers, but be aware that bottom end torque and HP will suffer as can be expected when running any big two barrel carb...have you taken a look at the Edelbrock 500 cfm carb? I can't remember if it was pele or peejay that had a buddy that sorted out the mess at the "other" rotary site....supposedly kicked ***...

 

To tell you the truth, I'm going to have Paul Yaw do a carb for me because:
1) I've read dozens of good reports and no bad ones on his work.
2) I value the immense amount of research he has personally undertaken in the field of Mazda Rotary fuel/air/exhaust flow.
3) I want the tuneability, driveability, and full-spectrum power his carbs claim.

 

I think what you need to look into, if I'm understanding you right, is a carb which will not require extensive modification or replacement when you streetport your engine.

Personally, I'd say a Weber 48IDA (downdraft) is probably what you're looking for. That carb isn't going to limit you when you start porting. A 45DCOE or something on the other hand, probably won't be optimal for the ported motor, while it's OK for stock.

Another issue is, if you get a sidedraft, the u-shaped manifolds that come with most of the kits are apparently quite restrictive at high rpm, where the streetport makes its power. If you go this route (weber or Dellorto sidedraft) you'll probably want to look into a Lake Cities style straight manifold when you go streetport. You may want to go to different size chokes as well, and of course different jetting.

I don't know much about the 4 barrels, so I won't comment too much. What I can say, is that I was more than glad to throw that clunky, complicated Nikki as far away as possible. The Dellorto (what I'm running now) is so much simpler to adjust/tune and easier to work on and understand, it's just ridiculous.

That Yaw would have to be some hell of a carb for me to ever consider running a Nikki. Mind you, it's an irrelevant issue, because it takes 2 years for the guy to even return an email. I think you'd have to be nuts to wait around on that (unless you're racing and need a Nikki for rules), when you can find used Weber and Dell kits all over the place for $300.

That RB Holley now; they sell a different carb for streetport than for stockport. I'm guessing there are some changes other than just jetting. So you probably wouldn't be able to just run that stockport RB Holley on a streetport, or at least, it wouldn't be optimal. You should probably call RB up and ask them, if you're thinking of going this route.

I gotta say, I'm just in love with the 2 barrel carbs; they offer incredible throttle response, power, and sound absolutely phenomenal... there's nothing like it. It's a real experience.

Either way, when you do the porting, you'll have to rejet and maybe change some other parts; I would just look for an option that won't require outright replacement.

 

Theres more than one place to get a good trick Nikki carb. And I know these guys can enlarge the chokes for you too (which isn't legal in ITA). I've had no prob getting ahold of them on the phone in the past and are quite helpful. Oh, and two cars they've supplied parts and service for just took 3rd and 7th place SCCA Runoffs E Production class.

http://sdjmotorsports.com/Tour3.htm

On the street I'd prefer a progressive 4bbl to maximize end torque and minimize low end full throttle bog.
-bp-

 

I personally like the RB Holley carbs. I like the idea of the four barrel carbs, because it seems there are less disadvantages on the low end power. Easy to adjust, don't have to take it apart for setting the float bowls, etc... Sounds awesome. Great response.

If you have questions about crabs you should ask peejay. He seems to have his stuff down right when it comes to carbs. He was a invaluable source of info for me.

-Error402

 

Damn, I didn't wanna know that!!

 

Roflmao!!!!

 

Your a bastard.

-Error402