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so, i've been shopping for a holly 600 cfm. does it matter if it's a manuel or electric choke?
also i remember seeing a setup on ebay a few months ago which was a rb intake for the holly but the guy had a demon 575 cfm i believe. looking at the demons i must say they look pretty nice. they come in 525, 575, 625 cfm models. any1 use one? should i just buy a holly instead? |
I use the 600cfm holley carbs for GM's with the prefix p/n 1850. You can't just slap a carb on a rotary and expect it to work properly. The carbs I use are vaccum secondary and I convert them to mechanical. I use a Racing Beat intake and open the plenum up. I drop it down 1/2in and blend it all in and use a 1/2in spacer for N/A motors or for Nitrous motors I use a plate system. The power valve is blocked and the secondary metering plate is modified. This setup is meant for track cars, drag racing, you can use it for street use but there is a slight hesitation when it transitions into the secondaries. But for drag racing it is great the way I set the carb up it is meant to be wide open. The racing beat carbs are great carbs people don't want to fork out the money for them but hell you can't beat them. They allow your motor to run smoothly with no hesitation at all. Webers, Mikuni and Dellorto carbs are also good carbs it's all in your preference I'm a Holley person.
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Having a problem here....what do you do with the omp lines for these carbs though? I got the RB intake , which I guess I could drill for vacuum or a carb spacer plate, but v8s lose vacuum after the carb at higher rpms. Wouldn't this be the same problem? other than that, I have to run premix? what a pain... '85 12a btw... with a Holley. https://www.nopistons.com/forums/pub...IR#>/blush.png
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Nah, I think the RB carbs are over rated if you ask me. I'm going for a Demon carb next!
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count me in for demon
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Originally Posted by 12arotaryboy23' post='720039' date='Jun 1 2005, 07:04 PM
Having a problem here....what do you do with the omp lines for these carbs though? I got the RB intake , which I guess I could drill for vacuum or a carb spacer plate, but v8s lose vacuum after the carb at higher rpms. Wouldn't this be the same problem? other than that, I have to run premix? what a pain... '85 12a btw... with a Holley. https://www.nopistons.com/forums/pub...IR#>/blush.png |
My fancy new demon has given me nothing but problems, no support from the manufacturuer either. I suggest the Edelbrock thunder series. This is by the the most reliable carb I have.
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What size Demon? Is it on a RB HOLLEY INTAKE? I think 525cfm will work on an SP 12a
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what 525 cfm?! On a sp 12a? no way. The stock nikki was closer to 300cfm and even a ida weber is at 480 cfm (which if your runnning a sp 12a needed to be reventried to 400 cfm. Or thats what i am told by my engine biulder unless you want to have severe drivablility problems at the low end) I just don't see how you can even run a sp 12a at 525 cfm, a bp 12a yea, even 1/2 bp 12a, but a sp 12a....
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Originally Posted by zeroecco' post='840282' date='Oct 10 2006, 09:05 AM
what 525 cfm?! On a sp 12a? no way. The stock nikki was closer to 300cfm and even a ida weber is at 480 cfm (which if your runnning a sp 12a needed to be reventried to 400 cfm. Or thats what i am told by my engine biulder unless you want to have severe drivablility problems at the low end) I just don't see how you can even run a sp 12a at 525 cfm, a bp 12a yea, even 1/2 bp 12a, but a sp 12a.... |
Finally got the carb! Now the project begins!
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Originally Posted by 13BTNOS' post='676491' date='Feb 23 2005, 10:44 AM
I use the 600cfm holley carbs for GM's with the prefix p/n 1850. You can't just slap a carb on a rotary and expect it to work properly. The carbs I use are vaccum secondary and I convert them to mechanical. I use a Racing Beat intake and open the plenum up. I drop it down 1/2in and blend it all in and use a 1/2in spacer for N/A motors or for Nitrous motors I use a plate system. The power valve is blocked and the secondary metering plate is modified. This setup is meant for track cars, drag racing, you can use it for street use but there is a slight hesitation when it transitions into the secondaries. But for drag racing it is great the way I set the carb up it is meant to be wide open. The racing beat carbs are great carbs people don't want to fork out the money for them but hell you can't beat them. They allow your motor to run smoothly with no hesitation at all. Webers, Mikuni and Dellorto carbs are also good carbs it's all in your preference I'm a Holley person. i have the same setup on my 79 12a but with a little bit of hawaiian punch 100 shot nitrous express ...is fasttttt |
i had the 600 vacuum with nitrous. went with a 650 double pump( cause i got it cheap) now and it works alot better with the nitrous.
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Originally Posted by 13BTNOS' post='676491' date='Feb 23 2005, 12:44 PM
I use the 600cfm holley carbs for GM's with the prefix p/n 1850. You can't just slap a carb on a rotary and expect it to work properly. The carbs I use are vaccum secondary and I convert them to mechanical. I use a Racing Beat intake and open the plenum up. I drop it down 1/2in and blend it all in and use a 1/2in spacer for N/A motors or for Nitrous motors I use a plate system. The power valve is blocked and the secondary metering plate is modified. This setup is meant for track cars, drag racing, you can use it for street use but there is a slight hesitation when it transitions into the secondaries. But for drag racing it is great the way I set the carb up it is meant to be wide open. The racing beat carbs are great carbs people don't want to fork out the money for them but hell you can't beat them. They allow your motor to run smoothly with no hesitation at all. Webers, Mikuni and Dellorto carbs are also good carbs it's all in your preference I'm a Holley person. I have a Mikuni on my 79, it will really go when it is punched over 3000 rpm, but getting to 3000 is a trick. It will stutter or bog down when I floor it around 1000 2500 rpm. I have been trying to fix this, but can't seem how. If you have any suggestions, please let me know. |
Originally Posted by firstgen24' post='861452' date='Feb 27 2007, 05:46 PM
I have a Mikuni on my 79, it will really go when it is punched over 3000 rpm, but getting to 3000 is a trick. It will stutter or bog down when I floor it around 1000 2500 rpm. I have been trying to fix this, but can't seem how. If you have any suggestions, please let me know. |
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