mighty demon jetting
Thread Starter
Race Director
Joined: May 2003
Posts: 10,956
Likes: 409
From: California
Gkull... George, my friend... I became an expert on valve springs here from all the reading and recommendations by you and a few others.... my as well become a demon expert...
:-)
or are you just trying to barry me in reading? my wife says i'm addicted to this and my Red headed lover... maybe:-)
Moterhead.... have him chime in!!..would love the help.....
Marz,,,, starting to get that feeling....
enkeivette.... is your engine build similar to mine? if so, what did you end up with on both your jet sizes and bleed sizes?? for WOT
:-)
or are you just trying to barry me in reading? my wife says i'm addicted to this and my Red headed lover... maybe:-)
Moterhead.... have him chime in!!..would love the help.....
Marz,,,, starting to get that feeling....
enkeivette.... is your engine build similar to mine? if so, what did you end up with on both your jet sizes and bleed sizes?? for WOT
Thread Starter
Race Director
Joined: May 2003
Posts: 10,956
Likes: 409
From: California
her is the plan... changing the secondaries and primaries to 2 jet sizes up,,,, I want to buy 2 sizes of new air bleeds, take it down to the dyno and change the air bleeds there and run it out,,,
what do you think of this idea guys?
and how many sizes down on the bleeds do you recommend?
what do you think of this idea guys?
and how many sizes down on the bleeds do you recommend?
Last edited by pauldana; Mar 5, 2010 at 12:30 AM.
Melting Slicks
Joined: Sep 2004
Posts: 2,412
Likes: 3
her is the plan... changing the secondaries and primaries to 2 jet sizes up,,,, I want to buy 2 sizes of new air bleeds, take it down to the dyno and change the air bleeds there and run it out,,,
what do you think of this idea guys?
and how many sizes down on the bleeds do you recommend?
what do you think of this idea guys?
and how many sizes down on the bleeds do you recommend?
If you don't want to waste time drilling at the dyno I'd go with some 28s or maybe 30s, if you're trying to hit it dead on. But who knows, those could be way too small for your car. But if I were tuning in the dark that's what I would try first, having seen how my carb and Motorheads carb responded.
How big are your stock ones?
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,444
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
I'd start with some 26s (which will prob be too small) and drill them out larger, slowly. You can always drill bigger.
If you don't want to waste time drilling at the dyno I'd go with some 28s or maybe 30s, if you're trying to hit it dead on. But who knows, those could be way too small for your car. But if I were tuning in the dark that's what I would try first, having seen how my carb and Motorheads carb responded.
How big are your stock ones?
If you don't want to waste time drilling at the dyno I'd go with some 28s or maybe 30s, if you're trying to hit it dead on. But who knows, those could be way too small for your car. But if I were tuning in the dark that's what I would try first, having seen how my carb and Motorheads carb responded.
How big are your stock ones?
VENTURI SIZE:
1.400
1.425
IDLE AIR BLEEDS:
.070
.070
H.S. AIR BLEEDS:
.039
.039
They are very proud of these little pieces of brass. You might start out with .035 If you figure out the area of a circle with a diameter of .039 and then .035 the % of change is what you are looking for.
Get an online math calculator for areas of a circle. That is why I got away from holley jets and went to Maxi jets now from Comp Cams.
http://www.summitracing.com/search/P...?Ns=Rank%7cAsc
Thread Starter
Race Director
Joined: May 2003
Posts: 10,956
Likes: 409
From: California
ok... looks as if you guys are a bit a head of me...
I called BG again,,,, I ask them what bleeds are in there currently, they said they are I=70 and H=39,,,, George, you got it...
I will be buying the summit bleed case... thx.... so no drilling for me
BG said "I would never trust those A/F readings... go just by spark plug color"
HMMmmmmmm.....
"They are very proud of these little pieces of brass. You might start out with .035 If you figure out the area of a circle with a diameter of .039 and then .035 the % of change is what you are looking for."
easy. Pie *R^2....
.039=.00478 .035=.003848... difference% = 80%???? did I do that right???
I called BG again,,,, I ask them what bleeds are in there currently, they said they are I=70 and H=39,,,, George, you got it...
I will be buying the summit bleed case... thx.... so no drilling for me
BG said "I would never trust those A/F readings... go just by spark plug color"
HMMmmmmmm.....
"They are very proud of these little pieces of brass. You might start out with .035 If you figure out the area of a circle with a diameter of .039 and then .035 the % of change is what you are looking for."
easy. Pie *R^2....
.039=.00478 .035=.003848... difference% = 80%???? did I do that right???
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,444
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
"They are very proud of these little pieces of brass. You might start out with .035 If you figure out the area of a circle with a diameter of .039 and then .035 the % of change is what you are looking for."
easy. Pie *R^2....
.039=.00478 .035=.003848... difference% = 80%???? did I do that right???
easy. Pie *R^2....
.039=.00478 .035=.003848... difference% = 80%???? did I do that right???
The radius is 1/2 of Diameter. The area of .039 = .00119 sq inches
The area of .035 = .00096 I don't know what your numbers are, but you get an "A" for answer of 80%
So even a .035 might be a radical change
Do you remember that I was frustrated with my own carb and had a local national known race carb shop set mine up and ran it on a 400 some ci circle track test mule motor? The cost of shipping your carb and have it come back very close to perfect might be less than what you are trying. All W.A.G.'s cost money on the dyno time.
At my work I only do webers and injection on the dyno
Thread Starter
Race Director
Joined: May 2003
Posts: 10,956
Likes: 409
From: California
http://www.freeonlinecalculator.net/...ane/circle.php
The radius is 1/2 of Diameter. The area of .039 = .00119 sq inches
The area of .035 = .00096 I don't know what your numbers are, but you get an "A" for answer of 80%
So even a .035 might be a radical change
Do you remember that I was frustrated with my own carb and had a local national known race carb shop set mine up and ran it on a 400 some ci circle track test mule motor? The cost of shipping your carb and have it come back very close to perfect might be less than what you are trying. All W.A.G.'s cost money on the dyno time.
At my work I only do webers and injection on the dyno
The radius is 1/2 of Diameter. The area of .039 = .00119 sq inches
The area of .035 = .00096 I don't know what your numbers are, but you get an "A" for answer of 80%
So even a .035 might be a radical change
Do you remember that I was frustrated with my own carb and had a local national known race carb shop set mine up and ran it on a 400 some ci circle track test mule motor? The cost of shipping your carb and have it come back very close to perfect might be less than what you are trying. All W.A.G.'s cost money on the dyno time.
At my work I only do webers and injection on the dyno
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Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,444
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
You are in the heartland of where hot rodding started. I would get ahold of some of those Southern Cal. shops and talk to them about prices.
I paid $360, But a bunch of it was parts. like new rear throttle blades that I had drilled holes in and the NASCAR type road racing anti foam needles and seats/ different floats......
I paid $360, But a bunch of it was parts. like new rear throttle blades that I had drilled holes in and the NASCAR type road racing anti foam needles and seats/ different floats......
