Another Thumperdart Success.....572 Hemi Sized (pics&Vids)
#2042293
03/30/16 10:53 PM
03/30/16 10:53 PM
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Joined: May 2004
Posts: 12,397 Taxes & Virus's R-US, NY
Dragula
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OP
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Taxes & Virus's R-US, NY
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Well, I probably am leaving out some details, but a friend of mine built a similar engine as mine....And asked if would come down and watch it being dyno'd....Of course I said yes, and brought my Thumperized 1250 Dominator to try if we had time. Build specs: 572 Hemi Eddy heads Solid Mechanical 283 dur @50 .680 lift 9.5:1 World Block Intake....Depends! But probably a Six Pack.....Yeah, Sixpack Hemi! -We tried a heavily modified six pack on a Modman intake first...This is Rob's engine, and for anyone who does not know him in the Mopar circles, he IS Mr. Six Pack.....He has been racing these six packs on Wedges for so long, I don't think he could help himself and built one for the Hemi. I was very glad he went with the Modman intake on this build as well. -First of many pulls was with the sixpack...Lots of tuning went into it on a basic run in stand with an AFR gauge before the dyno, but without a load, its tough.... Best pull with it was 741hp & 666ft/lbs....lots of tuning to get it there. Still needs work as the transition was blubbery with the vacuum carbs coming in...I prefer to run three mechanicals over anything vacuum, but I am sure he will figure it out. Vid.............: https://www.youtube.com/watch?v=ueC_4nAdSZ4&feature=youtu.beNext was the Promax 950 Dyno mule carb he had....Not sure what was done, but we made a bunch of pulls with it changing air bleads, timing, etc and netted a best of 749hp at 704ft/lbs... Vid.......................: https://www.youtube.com/watch?v=5QjkTW-o1QY&feature=youtu.beNow we get to my 1250 G3 Holley that I had Thumperized.....Now it has not had fuel in it since the conversion....It was a 3-circuit and I could not make it work on my 605...Had it converted to 2-circuit, and never touched it! Fired right up to a perfect idle, and then mad 779hp & 717ft/lbs of torque....No adjustments other than floats.... Vid......................: https://www.youtube.com/watch?v=M5l_w8n8gbE&feature=youtu.beThanks Mike at Jan Cen Racing and Rob Brooks for inviting me....
Last edited by Dragula; 03/30/16 11:35 PM.
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Re: Another Thumperdart Success.....572 Hemi Sized (pics&Vids)
[Re: sgcuda]
#2042338
03/30/16 11:31 PM
03/30/16 11:31 PM
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Joined: May 2004
Posts: 12,397 Taxes & Virus's R-US, NY
Dragula
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OP
I Live Here
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Taxes & Virus's R-US, NY
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Not sure if anyone on here has heard of Jan-Cen Racing or Mike Janis, but those guys are Pro Mod gurus....I saw so many high end blowers and Hemis today all over the shop....Amazing..... Here are a couple more pics.... ************************ A torched Seal 4-Good Exhaust gasket from Rob's motor on the run in stand...Ironic really!*********************************
Last edited by Dragula; 03/30/16 11:33 PM.
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Re: Another Thumperdart Success.....572 Hemi Sized (pics&Vids)
[Re: Dragula]
#2042367
03/30/16 11:51 PM
03/30/16 11:51 PM
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Joined: Jan 2011
Posts: 4,785 Utah and Alaska
astjp2
master
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master
Joined: Jan 2011
Posts: 4,785
Utah and Alaska
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No stageV intake and dual carbs? Or the Eddy intake with duals?
1941 Taylorcraft 1968 Charger 1994 Wrangler 1998 Wrangler 2008 Kia Rio 2017 Jetta
I didn't do 4 years and 9 months of Graduate School to be called Mister!
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Re: Another Thumperdart Success.....572 Hemi Sized (pics&Vids)
[Re: astjp2]
#2042405
03/31/16 12:28 AM
03/31/16 12:28 AM
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Joined: May 2004
Posts: 12,397 Taxes & Virus's R-US, NY
Dragula
OP
I Live Here
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OP
I Live Here
Joined: May 2004
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Taxes & Virus's R-US, NY
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No stageV intake and dual carbs? Or the Eddy intake with duals? Ahhh No....You forgot to lend them to us...Still waiting!
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Re: Another Thumperdart Success.....572 Hemi Sized (pics&Vids)
[Re: Dragula]
#2042410
03/31/16 12:37 AM
03/31/16 12:37 AM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,318
State of confusion
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Well, I probably am leaving out some details, but a friend of mine built a similar engine as mine....And asked if would come down and watch it being dyno'd....Of course I said yes, and brought my Thumperized 1250 Dominator to try if we had time. Build specs: 572 Hemi Eddy heads Solid Mechanical 283 dur @50 .680 lift 9.5:1 World Block Intake....Depends! But probably a Six Pack.....Yeah, Sixpack Hemi! -We tried a heavily modified six pack on a Modman intake first...This is Rob's engine, and for anyone who does not know him in the Mopar circles, he IS Mr. Six Pack.....He has been racing these six packs on Wedges for so long, I don't think he could help himself and built one for the Hemi. I was very glad he went with the Modman intake on this build as well. -First of many pulls was with the sixpack...Lots of tuning went into it on a basic run in stand with an AFR gauge before the dyno, but without a load, its tough.... Best pull with it was 741hp & 666ft/lbs....lots of tuning to get it there. Still needs work as the transition was blubbery with the vacuum carbs coming in...I prefer to run three mechanicals over anything vacuum, but I am sure he will figure it out. Vid.............: https://www.youtube.com/watch?v=ueC_4nAdSZ4&feature=youtu.beNext was the Promax 950 Dyno mule carb he had....Not sure what was done, but we made a bunch of pulls with it changing air bleads, timing, etc and netted a best of 749hp at 704ft/lbs... Vid.......................: https://www.youtube.com/watch?v=5QjkTW-o1QY&feature=youtu.beNow we get to my 1250 G3 Holley that I had Thumperized.....Now it has not had fuel in it since the conversion....It was a 3-circuit and I could not make it work on my 605...Had it converted to 2-circuit, and never touched it! Fired right up to a perfect idle, and then mad 779hp & 717ft/lbs of torque....No adjustments other than floats.... Vid......................: https://www.youtube.com/watch?v=M5l_w8n8gbE&feature=youtu.beThanks Mike at Jan Cen Racing and Rob Brooks for inviting me.... Thank you so much and glad it worked out for you guys..........
Last edited by Thumperdart; 03/31/16 12:28 PM.
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Another Thumperdart Success.....572 Hemi Sized (pics&Vids)
[Re: Dragula]
#2042423
03/31/16 01:04 AM
03/31/16 01:04 AM
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Joined: Jun 2003
Posts: 9,225 Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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Now that sounds like a fun dyno day
Gen 3 power 6.22@110, 9.85@135 Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Another Thumperdart Success.....572 Hemi Sized (pics&Vids)
[Re: Dragula]
#2042759
03/31/16 03:46 PM
03/31/16 03:46 PM
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Joined: Jul 2010
Posts: 2,422 Pittsburgh PA
Eric
top fuel
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top fuel
Joined: Jul 2010
Posts: 2,422
Pittsburgh PA
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Not sure if anyone on here has heard of Jan-Cen Racing or Mike Janis, but those guys are Pro Mod gurus....I saw so many high end blowers and Hemis today all over the shop....Amazing..... Here are a couple more pics.... ************************ A torched Seal 4-Good Exhaust gasket from Rob's motor on the run in stand...Ironic really!********************************* My block is there right now..lol
5.53 @ 125 1/8th on the launch control..more left in her!
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Re: Another Thumperdart Success.....572 Hemi Sized (pics&Vids)
[Re: 73DAD]
#2042917
03/31/16 07:59 PM
03/31/16 07:59 PM
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Joined: May 2004
Posts: 12,397 Taxes & Virus's R-US, NY
Dragula
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Did they do anything special for the exhaust relief on the pistons for the edelbrock heads' different exhaust valve angle? Or was the compression height low enough to make it a non-issue? Awesome motor, box stock head castings or ported? The eddy heads caused major issues for Rob and how they fit up with the pistons....I know he had to have the pistons re-done multiple times due to the newness of the heads, and ultimately, I think it contributed to the lower compression than what his target was.
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Re: Another Thumperdart Success.....572 Hemi Sized (pics&Vids)
[Re: Monte_Smith]
#2043116
03/31/16 11:09 PM
03/31/16 11:09 PM
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Joined: May 2004
Posts: 12,397 Taxes & Virus's R-US, NY
Dragula
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OP
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Predictable results from the selected carb and manifold combinations. Six Pack was actually closer to Dominator than I thought it would be. Would have been interesting to try single top on Mod Man, just to see results. But would only be a research project as doubt anybody would use one for that I actually thought the Dominator was too big for this motor, but I had it sitting on the shelf waiting for my 605 to be finished up. AFR on his motor was right around 12.7-13.0 and he used ethanol free fuel. So it seemed right in the ball park and we just left it that way. What you can't see is how bad the six pack was where the outboards opened in the mid range. The AFR jumped all over when the opened. A couple of the pulls it was real noticeable. I do not have a copy of the dyno sheets, but you might be able to hear it in the vid. It stumbled every-time. The more we messed with it, the more it seemed to get a tad worse. First pull was the best. And the engine was the coolest. Bringing it earlier seemed better. It did make the Hp though....I would loved to have tried three center carbs.
Last edited by Dragula; 03/31/16 11:10 PM.
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Re: Another Thumperdart Success.....572 Hemi Sized (pics&Vids)
[Re: Dragula]
#2043252
04/01/16 01:16 AM
04/01/16 01:16 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I know Mike very well.. surprised you didnt jet up on that 1250... all in all a good day on the dyno congrats
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