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Conv headed ,598 on alky perfomance in a 1950 dragster
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DRR Sportsman
Picture of Mike Frizie
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Just wondering what performance any of you running a similar combo are seeing peformance wise. I.E. 60ft times, 1/8 et and mph. best im seeing is mid to upper 4.7x's @ 143, 144mph. feel like my 60' foot times and mph are off compared to other combos. I've tried multiple carbs, converters, and rear gear changes. also double checked timing and found it 6 degrees high, moved back to 34. still absolutely no change. thoughts. what am i missing.


Michael Frizie
ET 2471
 
Posts: 577 | Location: Winston, GA | Registered: April 10, 2002Reply With QuoteReport This Post
DRR Sportsman
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I don't have a 598 but I have a 555 with an APD 1250 thats been 4.75 @145 but really hovers around 4.79-4.81 143-144. Mine is in a hardtail that weighs 1930.

The worst air I saw all season was the SFG Million and I was going 4.81-4.85 that week if you happened to be at that race.

I'm no expert but with everything you've changed I'd say you're just not flowing enough cfm to make the HP or it's down on compression.


Denis LeBlanc

 
Posts: 475 | Location: Manchester, NH | Registered: February 03, 2006Reply With QuoteReport This Post
DRR Sportsman
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should be 15:1 . so says build sheet.


Michael Frizie
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Posts: 577 | Location: Winston, GA | Registered: April 10, 2002Reply With QuoteReport This Post
DRR Pro
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My son Cory's Ezell Dragster has a Wilson steel block 598 with BB3s with 1250 alcohol APD went 4.62 at 148 in Bristol last week with 1.04 60ft and went 4.53 at 150 in Galot the week before...car weighs 1885 with skinny man in it!
 
Posts: 1754 | Location: Houston, Tx. | Registered: November 27, 2008Reply With QuoteReport This Post
DRR Sportsman
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assuming scales i used to weigh mine with my fat azz in it i was at 1960 sitting in it. rupert 1250 on mine . i only ran 4.8's at 142 at bristol.


Michael Frizie
ET 2471
 
Posts: 577 | Location: Winston, GA | Registered: April 10, 2002Reply With QuoteReport This Post
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My dads was running 4.4-4.5 conventional head single ally carb


J.R. Baxter

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Abruzzi
 
Posts: 1529 | Location: Waxahachie | Registered: July 04, 2005Reply With QuoteReport This Post
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quote:
Originally posted by seabass:
My dads was running 4.4-4.5 conventional head single ally carb


Rusty's ran REALLY well all times of the year too !
 
Posts: 1754 | Location: Houston, Tx. | Registered: November 27, 2008Reply With QuoteReport This Post



DRR Sportsman
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just cant seem to find where the mis match is at though. nothing ive tried has made any changes.


Michael Frizie
ET 2471
 
Posts: 577 | Location: Winston, GA | Registered: April 10, 2002Reply With QuoteReport This Post
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quote:
Originally posted by DRB Motorsports:
Just wondering what performance any of you running a similar combo are seeing peformance wise. I.E. 60ft times, 1/8 et and mph. best im seeing is mid to upper 4.7x's @ 143, 144mph. feel like my 60' foot times and mph are off compared to other combos. I've tried multiple carbs, converters, and rear gear changes. also double checked timing and found it 6 degrees high, moved back to 34. still absolutely no change. thoughts. what am i missing.


What are you expecting? From your numbers your motor is making 925 to 945 HP. You listed no cam, head, intake motor info, no converter trans gear and tire info...

If your heads are on the small side, try a gas carb, you will see a performance gain if so.
 
Posts: 2161 | Location: Tewksbury, MA,USA | Registered: November 03, 2000Reply With QuoteReport This Post
DRR Sportsman
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intake is bm 2017
heads are bb3 rec ports ( i wanna say 380cc runner) but not the cnc version from brodix
cam is really close to the RM 420-117 numbers
have tried both a 4.10 and 4.30 rear gear, both with 3191 lil
bubba tires. one converter stalling 6800, the other 6600
car has wing and beadlocks.


Michael Frizie
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Posts: 577 | Location: Winston, GA | Registered: April 10, 2002Reply With QuoteReport This Post
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quote:
Originally posted by DRB Motorsports:
intake is bm 2017
heads are bb3 rec ports ( i wanna say 380cc runner) but not the cnc version from brodix
cam is really close to the RM 420-117 numbers
have tried both a 4.10 and 4.30 rear gear, both with 3191 lil
bubba tires. one converter stalling 6800, the other 6600
car has wing and beadlocks.


What for the gear change do?

Is the wing a real one or just a rule wing that does nothing like the old Undercovers?

If you can borrow a good gas carb and you pick up a reasonable amount I'd say your current carb and or heads are holding you back. But I don't think there's a bunch if any missing either.
 
Posts: 2161 | Location: Tewksbury, MA,USA | Registered: November 03, 2000Reply With QuoteReport This Post
DRR Sportsman
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weird part about all the changes is not a positive or negative change at all .


Michael Frizie
ET 2471
 
Posts: 577 | Location: Winston, GA | Registered: April 10, 2002Reply With QuoteReport This Post
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quote:
Originally posted by DRB Motorsports:
intake is bm 2017
heads are bb3 rec ports ( i wanna say 380cc runner) but not the cnc version from brodix
cam is really close to the RM 420-117 numbers
have tried both a 4.10 and 4.30 rear gear, both with 3191 lil
bubba tires. one converter stalling 6800, the other 6600
car has wing and beadlocks.


The wing can be worth up to .05 et, but if the heads aren't the CNC version of the bb3's, I would have to venture a guess to say that that could be your culprit.. But also, what are the cam specs? Being "close" to the R-M 420-117 can leave a lot of variables in the air with the cam also.. I would try to list the cam if you could, and maybe find out more info on those heads.. But realistically, mid-high 4.70's with a 598 on alky and non-cnc heads at 1960 lbs doesn't sound that far off..


Nick Craig

1971 Camaro Split Bumper
376ci LS3
 
Posts: 410 | Location: Ohio | Registered: December 28, 2013Reply With QuoteReport This Post
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I got a 598 in my dragster 1980 lbs on the starting line. Terminator and a PTC 10” Conv. This past Saturday at MDIR I went 4.70 @ 144
Lil Bubbas and 430 gear. Conv falls back to 6350 after the shift. 7300.


Brian Mollison
2013 American Dragster
2020 Sumerduck Dragway VA Top ET Champion
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Posts: 1029 | Location: Stafford, Virginia | Registered: October 03, 2006Reply With QuoteReport This Post



DRR Sportsman
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Wow, 900 fall back


Michael Frizie
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Posts: 577 | Location: Winston, GA | Registered: April 10, 2002Reply With QuoteReport This Post
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If you can get the weight down to 1900 range 4.75 in 2000' should be possible and upper 4.60's when weather and track are really good. My son's 598 is 2000 on the starting line and runs upper 4.70's low 4.80's in 1500' of air. Low 4.80's this summer when it was bad hot out. It made 1025 and 830, but i've been playing with converters all year so i think it has more left in it.
 
Posts: 393 | Location: Pride, La | Registered: April 18, 2006Reply With QuoteReport This Post
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