Re: It's alive
[Re: mopar dave]
#3041689
05/11/22 11:49 PM
05/11/22 11:49 PM
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Joined: Mar 2009
Posts: 2,475 Sydney,Australia
tex013
top fuel
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top fuel
Joined: Mar 2009
Posts: 2,475
Sydney,Australia
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wow looking flat out fast
Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: It's alive
[Re: mopar dave]
#3041700
05/12/22 01:16 AM
05/12/22 01:16 AM
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Joined: Jan 2003
Posts: 10,023 Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,023
Frostbitefalls MN (Rocky&Bullw...
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Cool. Glad to see that beast is up and running again. Did you gain anything with the annular boosters vs downleg? Great looking ride, Doug! If the carbs work well i am betting on your "8". Looking forward to a detailed track report👍
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: It's alive
[Re: dvw]
#3041748
05/12/22 10:31 AM
05/12/22 10:31 AM
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Joined: Dec 2021
Posts: 1,199 Loudoun County, VA
Brad_Haak
super stock
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super stock
Joined: Dec 2021
Posts: 1,199
Loudoun County, VA
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This is my 1.61" venturi 4150 w/ a set of Mark's annular boosters... as yet untested on an engine.
2021 Challenger 6.4L Scat Pack 1320 100% stock: 1.680, 11.894 at 113.75 (DA 175 ft) weight reduction, wheels, tires, Hellcat air box: 1.661, 11.686 at 115.97 (DA 710 ft)
1973 Challenger 452 ci street/strip [2008] pump gas, DOT radials: 1.454, 10.523 at 126.44 (DA 514 ft)
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Re: It's alive
[Re: Brad_Haak]
#3041749
05/12/22 10:39 AM
05/12/22 10:39 AM
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Joined: Mar 2006
Posts: 9,888 MI, usa
dvw
OP
master
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OP
master
Joined: Mar 2006
Posts: 9,888
MI, usa
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Same size here. I've been very happy with Mark. Great to deal with. Doug
Last edited by dvw; 05/12/22 10:40 AM.
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Re: It's alive
[Re: mopar dave]
#3041807
05/12/22 03:10 PM
05/12/22 03:10 PM
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Joined: Dec 2021
Posts: 1,199 Loudoun County, VA
Brad_Haak
super stock
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super stock
Joined: Dec 2021
Posts: 1,199
Loudoun County, VA
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Curious to your results as well. I have been told annulars don't work as well as downlegs in a 4150. The venturi is just too small. IMO, booster selection can be somewhat subjective. Put downleg boosters in a "big" 4150 venturi, say 1.58+, and in some (many?) cases it's going to suffer from low booster signal and ragged fuel distribution at low(er) RPM. A "big" venturi 4150 carb with annular boosters may not flow any more than a smaller venturi + downleg combination, but it may improve atomization and fuel distribution for the same flow rate. Whether that translates into a performance improvement is tied to the combination. I also have a hypothesis that two annular boosters of comparable size and dry-flow capabilities may result in significantly different wet-flow results where the booster with improved atomization actually reduces the total air-fuel volume significantly. If that's true and the configuration w/ the better atomization -- yet lower wet-flow rate -- improves performance, then that could (would?) reflect an air-fuel mixture quality vs quantity scenario. Top view of the 1.61" v annular carb pictured above; that's a big hole to park a typical downleg in.
2021 Challenger 6.4L Scat Pack 1320 100% stock: 1.680, 11.894 at 113.75 (DA 175 ft) weight reduction, wheels, tires, Hellcat air box: 1.661, 11.686 at 115.97 (DA 710 ft)
1973 Challenger 452 ci street/strip [2008] pump gas, DOT radials: 1.454, 10.523 at 126.44 (DA 514 ft)
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Re: It's alive
[Re: moparacer]
#3041813
05/12/22 03:42 PM
05/12/22 03:42 PM
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Joined: Jan 2003
Posts: 4,101 Shelby Twp. Mi
HardcoreB
master
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master
Joined: Jan 2003
Posts: 4,101
Shelby Twp. Mi
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Great news! You car is a work of art.....
Interesting you retarded your cam too. I did a few weeks ago and it picked mine up. What is the application CID/heads/compression? What cam grind and where did you put the ICL?
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Re: It's alive
[Re: HardcoreB]
#3041847
05/12/22 06:36 PM
05/12/22 06:36 PM
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Joined: Mar 2006
Posts: 9,888 MI, usa
dvw
OP
master
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OP
master
Joined: Mar 2006
Posts: 9,888
MI, usa
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Mine are the 1.61" venturi also. It has been 148-150 mph with Edelbrock 750's in good air. I'm sure that these have more than enough airflow at my rpm (7300 max). Dry flow was over 1100. For sure it picked up at the starting line. Solid mid 1.2x 60ft leaving at 3000 rpm off the foot brake. Already was 149 mph in OK air. Last weight was 3335 with me. We'll see how it runs tomorrow. Doug.
Last edited by dvw; 05/12/22 06:36 PM.
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Re: It's alive
[Re: mopar dave]
#3041971
05/13/22 10:58 AM
05/13/22 10:58 AM
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Joined: Dec 2021
Posts: 1,199 Loudoun County, VA
Brad_Haak
super stock
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super stock
Joined: Dec 2021
Posts: 1,199
Loudoun County, VA
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Dave - FWIW (not much), I wouldn't put an annular in anything smaller than a 1.56" venturi
2021 Challenger 6.4L Scat Pack 1320 100% stock: 1.680, 11.894 at 113.75 (DA 175 ft) weight reduction, wheels, tires, Hellcat air box: 1.661, 11.686 at 115.97 (DA 710 ft)
1973 Challenger 452 ci street/strip [2008] pump gas, DOT radials: 1.454, 10.523 at 126.44 (DA 514 ft)
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Re: It's alive
[Re: justinp61]
#3042326
05/14/22 05:23 PM
05/14/22 05:23 PM
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Joined: Mar 2003
Posts: 6,341 Heaven
EvilB1Dart
master
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master
Joined: Mar 2003
Posts: 6,341
Heaven
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That's a nice piece. Real nice!
"Any fool can know. The point is to understand"
- A. Einstein
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