Re: Hemi running problems
[Re: NITROUSN]
#2936197
06/23/21 09:12 PM
06/23/21 09:12 PM
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Joined: May 2005
Posts: 1,944 Apollo, PA.
B1MAXX
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top fuel
Joined: May 2005
Posts: 1,944
Apollo, PA.
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If you have a plug, plug the power valve see if part throttle is better. If it is then lower the power valve to keep it out at part throttle.
Last edited by B1MAXX; 06/23/21 09:13 PM.
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Re: Hemi running problems
[Re: B1MAXX]
#2936215
06/23/21 09:43 PM
06/23/21 09:43 PM
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Joined: Jan 2003
Posts: 18,389 UPPER MICHIGAN, MARQUETTE COUN...
NITROUSN
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If its pump gas I have seen certain blends try and vapor/boil when driving causing almost flooding type conditions. Seems to happen with winter blend pump gas. You could be on to something there. I was charging the a/c and going over the basic adjustments when I noticed steam like smoke coming out of the bowl vent. I thought that was very odd. It also seems the hotter it gets or the longer I run it the worse it seems. I filled this tank when I calibrated the fuel gauge end of March first week of April. I have run about half of it out. I may just drain the rest for the mower and fill with new premium.
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Re: Hemi running problems
[Re: NITROUSN]
#2936223
06/23/21 09:52 PM
06/23/21 09:52 PM
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Joined: May 2004
Posts: 12,379 Taxes & Virus's R-US, NY
Dragula
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I Live Here
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Taxes & Virus's R-US, NY
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I have a 528 Iron headed 10 to 1 Hemi. Comp flat tappet hydraulic .535/.541, Mancini ready to run dizzy with a MSD blaster SS coil. Mopar performance high rise intake with a single pro systems 4150hp carb . Timing set at 32 total vacuum can capped. Car starts fine hot or cold. Runs strong but does not like low speed running. Likes to buck and surge at light to medium throttle. Vacuum is 10. Plugs are NGK R5671-9. They all seem to be firing but are black and sooty. Power valve is 6.5 with 84 mains. Trying to sort it out in a positive manner. Thanks. What size carb? Bet its a tad rich at idle and big time lean else where if not way under sized. Typically a Hemi likes a bigger carb than the book calls for. Our 474-484 Hemi's like 950 to 1050 sized 4150 carbs...Use the Proform race carb jetting. We find their calibrations to be very close for all our builds in 4150 size carbs. I had a Prosystems 1000, and it would idle and drive around town, but if you stepped on it, it went so lean it nearly stalled. I put the same calibration in that Proform had for their carb of the same size in the Prosystems, and what a difference. I would start there...Also, I am anti power valve and always jet my stuff square.
Last edited by Dragula; 06/23/21 09:53 PM.
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Re: Hemi running problems
[Re: Dragula]
#2936233
06/23/21 10:07 PM
06/23/21 10:07 PM
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Joined: Jan 2003
Posts: 18,389 UPPER MICHIGAN, MARQUETTE COUN...
NITROUSN
OP
I Live Here
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OP
I Live Here
Joined: Jan 2003
Posts: 18,389
UPPER MICHIGAN, MARQUETTE COUN...
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I have a 528 Iron headed 10 to 1 Hemi. Comp flat tappet hydraulic .535/.541, Mancini ready to run dizzy with a MSD blaster SS coil. Mopar performance high rise intake with a single pro systems 4150hp carb . Timing set at 32 total vacuum can capped. Car starts fine hot or cold. Runs strong but does not like low speed running. Likes to buck and surge at light to medium throttle. Vacuum is 10. Plugs are NGK R5671-9. They all seem to be firing but are black and sooty. Power valve is 6.5 with 84 mains. Trying to sort it out in a positive manner. Thanks. What size carb? Bet its a tad rich at idle and big time lean else where if not way under sized. Typically a Hemi likes a bigger carb than the book calls for. Our 474-484 Hemi's like 950 to 1050 sized 4150 carbs...Use the Proform race carb jetting. We find their calibrations to be very close for all our builds in 4150 size carbs. I had a Prosystems 1000, and it would idle and drive around town, but if you stepped on it, it went so lean it nearly stalled. I put the same calibration in that Proform had for their carb of the same size in the Prosystems, and what a difference. I would start there...Also, I am anti power valve and always jet my stuff square. I am not 100 percent sure. Muscle Motors had it built when I made the deal. They did dyno the motor with it. I took it apart today and made notes what was in it. I might try to call Pro Systems to see if they can tell me. It is the Pro Series XE. One would assume it would be adequate. But assume usually it what bites a guy.
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Re: Hemi running problems
[Re: NITROUSN]
#2936241
06/23/21 10:15 PM
06/23/21 10:15 PM
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Joined: May 2005
Posts: 1,944 Apollo, PA.
B1MAXX
top fuel
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top fuel
Joined: May 2005
Posts: 1,944
Apollo, PA.
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If its pump gas I have seen certain blends try and vapor/boil when driving causing almost flooding type conditions. Seems to happen with winter blend pump gas. You could be on to something there. I was charging the a/c and going over the basic adjustments when I noticed steam like smoke coming out of the bowl vent. I thought that was very odd. It also seems the hotter it gets or the longer I run it the worse it seems. I filled this tank when I calibrated the fuel gauge end of March first week of April. I have run about half of it out. I may just drain the rest for the mower and fill with new premium. Exactly what first caught my eye on the one time I came across this also. I forget what we put in it, it was either 100 unleaded race gas or bp premium...been a while but it fixed it. It was actually causing the carb to flood, was like the needle and seat couldn't deal with the vapor.
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Re: Hemi running problems
[Re: B1MAXX]
#2936246
06/23/21 10:27 PM
06/23/21 10:27 PM
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Joined: Jan 2003
Posts: 18,389 UPPER MICHIGAN, MARQUETTE COUN...
NITROUSN
OP
I Live Here
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OP
I Live Here
Joined: Jan 2003
Posts: 18,389
UPPER MICHIGAN, MARQUETTE COUN...
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If its pump gas I have seen certain blends try and vapor/boil when driving causing almost flooding type conditions. Seems to happen with winter blend pump gas. You could be on to something there. I was charging the a/c and going over the basic adjustments when I noticed steam like smoke coming out of the bowl vent. I thought that was very odd. It also seems the hotter it gets or the longer I run it the worse it seems. I filled this tank when I calibrated the fuel gauge end of March first week of April. I have run about half of it out. I may just drain the rest for the mower and fill with new premium. Exactly what first caught my eye on the one time I came across this also. I forget what we put in it, it was either 100 unleaded race gas or bp premium...been a while but it fixed it. It was actually causing the carb to flood, was like the needle and seat couldn't deal with the vapor. This is BP premium.
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Re: Hemi running problems
[Re: NITROUSN]
#2936253
06/23/21 10:36 PM
06/23/21 10:36 PM
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Joined: Jan 2003
Posts: 19,304 Las Vegas
Al_Alguire
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I Live Here
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Las Vegas
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That plug is WAY to cold for your application. I would START there
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Hemi running problems
[Re: NITROUSN]
#2936256
06/23/21 10:55 PM
06/23/21 10:55 PM
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Joined: May 2005
Posts: 1,944 Apollo, PA.
B1MAXX
top fuel
|
top fuel
Joined: May 2005
Posts: 1,944
Apollo, PA.
|
If its pump gas I have seen certain blends try and vapor/boil when driving causing almost flooding type conditions. Seems to happen with winter blend pump gas. You could be on to something there. I was charging the a/c and going over the basic adjustments when I noticed steam like smoke coming out of the bowl vent. I thought that was very odd. It also seems the hotter it gets or the longer I run it the worse it seems. I filled this tank when I calibrated the fuel gauge end of March first week of April. I have run about half of it out. I may just drain the rest for the mower and fill with new premium. Exactly what first caught my eye on the one time I came across this also. I forget what we put in it, it was either 100 unleaded race gas or bp premium...been a while but it fixed it. It was actually causing the carb to flood, was like the needle and seat couldn't deal with the vapor. This is BP premium. still could be winter blend...and I could be wrong on what it was, but I wasn't the only one having those problems at that time. Different blend fixed it. I didn't think it would, but someone more familiar with the problem keyed me in on it. Fresh set of hotter plugs couldn't hurt either, but then you'll lose track of what changes did what.
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Re: Hemi running problems
[Re: Al_Alguire]
#2936318
06/24/21 08:41 AM
06/24/21 08:41 AM
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Joined: Jan 2003
Posts: 13,319 Marion, South Carolina [><]
an8sec70cuda
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I Live Here
Joined: Jan 2003
Posts: 13,319
Marion, South Carolina [><]
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That plug is WAY to cold for your application. I would START there Change the plugs before you do anything else.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Hemi running problems
[Re: NITROUSN]
#2936373
06/24/21 11:15 AM
06/24/21 11:15 AM
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Joined: Jun 2014
Posts: 3,105 Md.
carnut68
master
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master
Joined: Jun 2014
Posts: 3,105
Md.
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I have a 528 Iron headed 10 to 1 Hemi. Comp flat tappet hydraulic .535/.541, Mancini ready to run dizzy with a MSD blaster SS coil. Mopar performance high rise intake with a single pro systems 4150hp carb . Timing set at 32 total vacuum can capped. Car starts fine hot or cold. Runs strong but does not like low speed running. Likes to buck and surge at light to medium throttle. Vacuum is 10. Plugs are NGK R5671-9. They all seem to be firing but are black and sooty. Power valve is 6.5 with 84 mains. Trying to sort it out in a positive manner. Thanks. What size carb? Bet its a tad rich at idle and big time lean else where if not way under sized. Typically a Hemi likes a bigger carb than the book calls for. Our 474-484 Hemi's like 950 to 1050 sized 4150 carbs...Use the Proform race carb jetting. We find their calibrations to be very close for all our builds in 4150 size carbs. I had a Prosystems 1000, and it would idle and drive around town, but if you stepped on it, it went so lean it nearly stalled. I put the same calibration in that Proform had for their carb of the same size in the Prosystems, and what a difference. I would start there...Also, I am anti power valve and always jet my stuff square. I am not 100 percent sure. Muscle Motors had it built when I made the deal. They did dyno the motor with it. I took it apart today and made notes what was in it. I might try to call Pro Systems to see if they can tell me. It is the Pro Series XE. One would assume it would be adequate. But assume usually it what bites a guy. I bought a Pro Systems [4150] carb and it wouldn't idle at all out of the box took a lot of tuning. WOT was good.
America First!
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Re: Hemi running problems
[Re: carnut68]
#2936402
06/24/21 01:13 PM
06/24/21 01:13 PM
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Joined: Jan 2003
Posts: 18,389 UPPER MICHIGAN, MARQUETTE COUN...
NITROUSN
OP
I Live Here
|
OP
I Live Here
Joined: Jan 2003
Posts: 18,389
UPPER MICHIGAN, MARQUETTE COUN...
|
I have a 528 Iron headed 10 to 1 Hemi. Comp flat tappet hydraulic .535/.541, Mancini ready to run dizzy with a MSD blaster SS coil. Mopar performance high rise intake with a single pro systems 4150hp carb . Timing set at 32 total vacuum can capped. Car starts fine hot or cold. Runs strong but does not like low speed running. Likes to buck and surge at light to medium throttle. Vacuum is 10. Plugs are NGK R5671-9. They all seem to be firing but are black and sooty. Power valve is 6.5 with 84 mains. Trying to sort it out in a positive manner. Thanks. What size carb? Bet its a tad rich at idle and big time lean else where if not way under sized. Typically a Hemi likes a bigger carb than the book calls for. Our 474-484 Hemi's like 950 to 1050 sized 4150 carbs...Use the Proform race carb jetting. We find their calibrations to be very close for all our builds in 4150 size carbs. I had a Prosystems 1000, and it would idle and drive around town, but if you stepped on it, it went so lean it nearly stalled. I put the same calibration in that Proform had for their carb of the same size in the Prosystems, and what a difference. I would start there...Also, I am anti power valve and always jet my stuff square. I am not 100 percent sure. Muscle Motors had it built when I made the deal. They did dyno the motor with it. I took it apart today and made notes what was in it. I might try to call Pro Systems to see if they can tell me. It is the Pro Series XE. One would assume it would be adequate. But assume usually it what bites a guy. I bought a Pro Systems [4150] carb and it wouldn't idle at all out of the box took a lot of tuning. WOT was good. What did you do to make it work. Mine idles and wide open is fine. Just low speed surge and jerk along with hesitation at light throttle tip in.
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