Carb opinions 540's 700 hp...
03-20-2015 | 02:00 PM
#131
Thread Starter
Gold Member
Joined: Oct 2005
Posts: 11,692
Likes: 217
From: Olmsted Falls,Ohio Marblehead,Oh
Tim, have you discussed the carb size with Bob M? I know he is helping you with the build , and I'm sure he has some data on which carb size to go with. I'd consult with him on it. He's worked with plenty of these builds , and I'm sure with several different sizes of carbs.
03-20-2015 | 02:07 PM
#132
Registered
Joined: Jul 2004
Posts: 11,332
Likes: 73
From: chicago
On my fountain tim, before I switched to race style hatches, it needed clearance for the small blowers. So they cut the bottom side of the hatch out, and some of the foam from the cushion. They installed inserts in that cutout, and my sunpad was retained and you'd never know anything was done under it. Same thing on my buddy's top gun.
03-20-2015 | 02:08 PM
#133
Registered
Joined: Jun 2009
Posts: 9,989
Likes: 6,484
From: Chicago
I'm sure Tim is smart enough to know you take advice from the guy whose been the done that. Not a keyboard expert on the sidelines with no experience or anything that is running actually.
Tim, if you need a mug picture posted or a new banana seat you know who to call.
If you decide quick fuel I get great pricing, let me know.
They also have a tech department, whatever they tell you I tend to go one size bigger.
Tim, if you need a mug picture posted or a new banana seat you know who to call.
If you decide quick fuel I get great pricing, let me know.
They also have a tech department, whatever they tell you I tend to go one size bigger.
Last edited by ICDEDPPL; 03-20-2015 at 02:10 PM.
03-20-2015 | 02:13 PM
#135
Thread Starter
Gold Member
Joined: Oct 2005
Posts: 11,692
Likes: 217
From: Olmsted Falls,Ohio Marblehead,Oh
On my fountain tim, before I switched to race style hatches, it needed clearance for the small blowers. So they cut the bottom side of the hatch out, and some of the foam from the cushion. They installed inserts in that cutout, and my sunpad was retained and you'd never know anything was done under it. Same thing on my buddy's top gun.
03-20-2015 | 02:17 PM
#136
Thread Starter
Gold Member
Joined: Oct 2005
Posts: 11,692
Likes: 217
From: Olmsted Falls,Ohio Marblehead,Oh
I'm sure Tim is smart enough to know you take advice from the guy whose been the done that. Not a keyboard expert on the sidelines with no experience or anything that is running actually.
Tim, if you need a mug picture posted or a new banana seat you know who to call.
If you decide quick fuel I get great pricing, let me know.
They also have a tech department, whatever they tell you I tend to go one size bigger.
Tim, if you need a mug picture posted or a new banana seat you know who to call.
If you decide quick fuel I get great pricing, let me know.
They also have a tech department, whatever they tell you I tend to go one size bigger.
03-20-2015 | 05:52 PM
#138
Registered
Joined: Oct 2004
Posts: 2,674
Likes: 658
From: Clayton NJ
I snuck into the local carb guys tool room and grabbed a couple pics of the tools of the trade. Doesn't matter which shop as anyone who knows the real scoop on this stuff knows they're all the same.
This is what I found:
The auger but on the right was marked, "for extreme measure only". Probably for all the bracket racing stuff.
Found this in a drawer labeled "choke horn removal tool" :
Huh, learn something every day. Who knew that that's all it takes to build and setup custom stuff?
This is what I found:
The auger but on the right was marked, "for extreme measure only". Probably for all the bracket racing stuff.
Found this in a drawer labeled "choke horn removal tool" :
Huh, learn something every day. Who knew that that's all it takes to build and setup custom stuff?
03-20-2015 | 07:08 PM
#139
Registered
Joined: Oct 2013
Posts: 487
Likes: 23
From: Salisbury N.C.
Call BLP Products ( Bo Laws Products ) in Florida . Talk to Joe , or Mike . They have a 850 with a Dominator Base Plate. Works awesome on big CI .
These guys ( namely Bo) were building carbs for Everything from Drag Racing to Nascar and Boats , before these other guys were even born .
They manufacture all the Holley Billet Parts for Holley , they make most of the billet parts these other guys put on their carbs !
You will appreciate the smaller venturi 850 for the driveability , the Dominator is a PITA unless you are WFO. You might loose 10HP on the big end , but you wont notice unless you dyno it.
Ive seen DOMs lose power in the Mid Range , due too Low Venturi velocity and poor distribution, compared to 850-830's .
Just My .02
These guys ( namely Bo) were building carbs for Everything from Drag Racing to Nascar and Boats , before these other guys were even born .
They manufacture all the Holley Billet Parts for Holley , they make most of the billet parts these other guys put on their carbs !
You will appreciate the smaller venturi 850 for the driveability , the Dominator is a PITA unless you are WFO. You might loose 10HP on the big end , but you wont notice unless you dyno it.
Ive seen DOMs lose power in the Mid Range , due too Low Venturi velocity and poor distribution, compared to 850-830's .
Just My .02
03-20-2015 | 07:56 PM
#140
Registered
Joined: Jul 2004
Posts: 11,332
Likes: 73
From: chicago
Good info from another thread. Funny, the bigger carb made even more torque at 3000RPM, and more HP up top. Not the first time i've seen that, thats for sure. 22FT lbs more at 3000, 16HP at 5500 RPM. I would have liked to see how much difference at 6000RPM.
About 5 years ago I had my 540cid engine with Dart intake on Tom Earhart's dyno with an 830cfm HP Series Holley carb with annular discharge and a hydraulic roller cam. I specifically remember Tom saying to me that in all the 25+ years of dyno testing engines he has never seen a carb "follow" as well on a naturally aspirated engine as what mine did on that day. "Follow" meaning the power curve was extremely good for the application and usable RPM range my engine was being used for. Heck, I have heard of some guys using a Holley 800cfm on a 540cid marine engine with excellent results!
BUT, we did run a 950hp Holley bact to back vs the 830hp just for comparison. Didn't really see a noticable difference until about 5400rpm. Here's the diff in HP/TQ we experienced...
RPM
3000 592TQ 338HP 830cfm
3000 614TQ 351HP 950cfm
3500 598TQ 398HP 830cfm
3500 598TQ 399HP 950cfm
4000 662TQ 504HP 830cfm
4000 662TQ 504HP 950cfm
4500 694TQ 594HP 830cfm
4500 692TQ 593HP 950cfm
5000 688TQ 655HP 830cfm
5000 684TQ 651HP 950cfm
5250 664TQ 664HP 830cfm
5250 658TQ 658HP 950cfm
5400 646TQ 664HP 830cfm
5400 655TQ 673HP 950cfm
5500 636TQ 666HP 830cfm
5500 651TQ 682HP 950cfm
BUT, we did run a 950hp Holley bact to back vs the 830hp just for comparison. Didn't really see a noticable difference until about 5400rpm. Here's the diff in HP/TQ we experienced...
RPM
3000 592TQ 338HP 830cfm
3000 614TQ 351HP 950cfm
3500 598TQ 398HP 830cfm
3500 598TQ 399HP 950cfm
4000 662TQ 504HP 830cfm
4000 662TQ 504HP 950cfm
4500 694TQ 594HP 830cfm
4500 692TQ 593HP 950cfm
5000 688TQ 655HP 830cfm
5000 684TQ 651HP 950cfm
5250 664TQ 664HP 830cfm
5250 658TQ 658HP 950cfm
5400 646TQ 664HP 830cfm
5400 655TQ 673HP 950cfm
5500 636TQ 666HP 830cfm
5500 651TQ 682HP 950cfm
