Whats so special about the RB "modified" carbs?
08-11-02, 08:54 PM
#3
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Yeah peejay, just wanted to say thanks with the few questions I had. The RB modded Holley is now in my car....all I can say is WOW! That bastard wants to go and go some more! Woohoo!! 
I'll start a new post in a few days with pics that I want to share with everyone.
I'll start a new post in a few days with pics that I want to share with everyone.
08-11-02, 09:01 PM
#5
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If you need some more let me know. I have some more put haven't had the time to upload them to my site yet.
It was funny, once everything was hooked up. I started the car and the thing just starts right up and idles at 5k. LOL...it's now idling at 750-800 which is where I want it. You can hear the air that thing sucks over my exhaust(which isn't a easy thing to do). Another thing that is awsome you can just see that bad boy not just trickle or spary in gas you see it like a freaking water fall!!
It was funny, once everything was hooked up. I started the car and the thing just starts right up and idles at 5k. LOL...it's now idling at 750-800 which is where I want it. You can hear the air that thing sucks over my exhaust(which isn't a easy thing to do). Another thing that is awsome you can just see that bad boy not just trickle or spary in gas you see it like a freaking water fall!!
08-11-02, 11:46 PM
#6
The RB modded Holley is now in my car....all I can say is WOW! That bastard wants to go and go some more! Woohoo!!
Actually I am thinking of getting myself another Holley set up soon, hence the question. Ok, more specifically, whats the difference between the standard port and street port carbs? They both have the same CFM's, so whats differernt? My plan is to buy one, throw it on my car, and then when I get my street ported engine done, I want to trow it on there too, so which setup should I be looking at? Also, later plans include a turbo...If that matters...
~T.J.
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08-12-02, 12:11 PM
#9
but if i got a normal holley wouldn't it still work?? they've got a mechanical secondaries no choke 450cfm carb for only $199 at summit, and my buddie has a rb manifold just laying around. rb wants $533 for just the carb and thats fricking rediculus. what are my options for other carbs. cause it i remember correctly the holley RB uses its a spread bore and you could easily get a plate that would change it to square bore and you could use any carb you wanted right??
08-12-02, 01:26 PM
#10
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You can use a normal holley if you cut channels between the two rotors' passages. A fellow rotorhead was running an Edelbrock carb on a wicked 12A and he was having problems with running extremely rich at higher RPM. I told him to cut channels between the two rotors... he was VERY pleased with the result
If you don't want to alter the RB manifold, then just get a 4-hole spacer for $20 and modify that. The airflow itself doesn't need to run between the channels, it's just the vacuum signal to the boosters that needs to be altered. Holley and other "traditional" carbs are designed to work with a constant flow of air and therefore a constant vacuum signal, whereas manifolds that separate the two rotors (basically every one available for rotaries including stock) have a very staccato vacuum signal since the airflow is always starting and stopping. At high RPM the Holley carb would see migh higher vacuum signal than it was designed for and it runs very rich, so you cut two channels between the two rotors to even things out.
If you don't want to alter the RB manifold, then just get a 4-hole spacer for $20 and modify that. The airflow itself doesn't need to run between the channels, it's just the vacuum signal to the boosters that needs to be altered. Holley and other "traditional" carbs are designed to work with a constant flow of air and therefore a constant vacuum signal, whereas manifolds that separate the two rotors (basically every one available for rotaries including stock) have a very staccato vacuum signal since the airflow is always starting and stopping. At high RPM the Holley carb would see migh higher vacuum signal than it was designed for and it runs very rich, so you cut two channels between the two rotors to even things out.
08-12-02, 01:33 PM
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Time for a picture or diagram, peejay, of what you're talking about. How big? Connecting primary and secondary? Primary with primary and secondary with secondary? I was curious about this, too. Maybe a link to the old site where you guys beat up on this subject so many moons ago...
08-12-02, 01:43 PM
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Just a garden variety common plenum 1/2" spacer? Really? And that's all it would take to run a 500 cfm Edelbrock? The next car that my RP streetport goes into will be sporting one, then....thanks!
08-12-02, 02:06 PM
#14
now in lame-mans terms just an open spacer like the ones that are for just moving the carb off the intake manifold?? is that all i'd need?? or would i need linkage also where would i get that stuff?? and a throttle cable mounting spot????
one like this???
one like this???
Last edited by Hyper4mance2k; 08-12-02 at 02:32 PM.
08-14-02, 02:57 AM
#23
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lol
yeah a big ol' Dominator sized carb would probably *start* working at about 5-6...
I saw a modified carb on a Cobra replica, forgot who did it (it wasn't BG or Demon, it was some company I'd never heard of). Apparently it started life as your typical 850cfm double-pumper but the venturis were so bored out that they might as well have been perfectly straight. But what really caught my attention were the boosters... they weren't dogleg or annular boosters, they were just flat-ended tubes sitting perpendicular to the venturis! I think they are called "aerosol" boosters, they rely completely on the airflow going past the ends to atomize the fuel.
Cobra ran 10's, no spray, with traction problems, so apparently they work quite well
yeah a big ol' Dominator sized carb would probably *start* working at about 5-6...
I saw a modified carb on a Cobra replica, forgot who did it (it wasn't BG or Demon, it was some company I'd never heard of). Apparently it started life as your typical 850cfm double-pumper but the venturis were so bored out that they might as well have been perfectly straight. But what really caught my attention were the boosters... they weren't dogleg or annular boosters, they were just flat-ended tubes sitting perpendicular to the venturis! I think they are called "aerosol" boosters, they rely completely on the airflow going past the ends to atomize the fuel.
Cobra ran 10's, no spray, with traction problems, so apparently they work quite well
08-14-02, 08:56 AM
#25
Originally posted by RotorMotorDriver
Anyway, If I buy a SP carb setup from RB, and then put it on my stock port 12A, is that a bad idea? Whats gonna happen?
~T.J.
Anyway, If I buy a SP carb setup from RB, and then put it on my stock port 12A, is that a bad idea? Whats gonna happen?
~T.J.