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Re: vacum carbs
[Re: gch]
#1970848
12/16/15 03:19 PM
12/16/15 03:19 PM
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Joined: Feb 2003
Posts: 991 Addison,IL
OUTLAWSSAA
super stock
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super stock
Joined: Feb 2003
Posts: 991
Addison,IL
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I have no experience with anything this wild but I will wager a guess.Perhaps to control the rpm that the secondaries come in to aid in traction out of the hole?? I can think of a couple of street scenarios but don't know that they would apply in these applications.
It will be interesting to see the actual reason. That's exactly right. I've been running 2 950's on a 588" HEMI for years now. There's actually an adjustment screw on the vacuum pod to make the secondaries open sooner or later.
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Re: vacum carbs
[Re: cesar perez]
#1971386
12/17/15 12:53 PM
12/17/15 12:53 PM
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Joined: Jan 2004
Posts: 4,866 North of Detroit
HemiDart68
master
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master
Joined: Jan 2004
Posts: 4,866
North of Detroit
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The 636 millenium is my motor. Why are they on there??
Simple and honest answer.... Came with the rolling chassis along with some other parts, so i thought i would try them.
Motor was built to be Big inch Low RPM. Also be NSS legal so dominators where not an option.
Jury is still out on them. Its a new combo for me. Motor starts easy, great on the street. very responsive. First track results where good. The 60 foot time was a soft. Leaving on the T brake the Racepak showed a flat spot in engine acceleration in the first second of the run. I believe the secondaries are opening too slow. The former owner of the carbs had the adjustment screws set all the in (in this case super slow opening). on this set after talking with the carb builder found out some vacum pods open faster by screwing in, these are the opposite. I expect to see a significant improvement the next time out. The results will tell.
In God we trust, all others pay cash.
www.lightnens.com (Home of the world's fastest Paint Job)
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Re: vacum carbs
[Re: cesar perez]
#1971392
12/17/15 01:01 PM
12/17/15 01:01 PM
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Joined: Jan 2004
Posts: 4,866 North of Detroit
HemiDart68
master
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master
Joined: Jan 2004
Posts: 4,866
North of Detroit
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The carbs where the real trick in NSS racing a few years back to aid in traction etc. I also think they had some advantages when it came to foot braking. On my car i use a T-brake and have a Grid if i need to soften up the hit of the tires, so if i had to do-over i would probably just do a set of 4150's. I did have a set of 4150 vacum carbs on my old car and worked real well on footbrake.
In God we trust, all others pay cash.
www.lightnens.com (Home of the world's fastest Paint Job)
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Re: vacum carbs
[Re: cesar perez]
#1974564
12/22/15 03:03 PM
12/22/15 03:03 PM
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Joined: Jan 2004
Posts: 4,866 North of Detroit
HemiDart68
master
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master
Joined: Jan 2004
Posts: 4,866
North of Detroit
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Use a moroso 4 vane pump. works great. pulls lots of vacuum. we bleed it off at I think 13. I would have to double check my racepak to be sure. Star makes nice stuff also. I have seen mixed reviews on the aerospace one.
As far as carb recommendations it is kind of a broad topic, and I'm not really an expert. Lots of competent carb builders out there. Most of your custom built 4150 carbs are going to run $1000 or so a piece. The carbs I have are from Biggs. He gave me his personal cell to answer questions when I didn't even buy them from him. I thought that was pretty cool. I would probably give him some business in the future. My engine builder uses bob book. Lots of good stuff out there. I do believe there is no such thing as a bolt on and go carb. all need to be tuned for the in a real world setting.
In God we trust, all others pay cash.
www.lightnens.com (Home of the world's fastest Paint Job)
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