Carbs

Jim Hanig · 06-19-2007, 12:52 AM

I heard a couple of racer iat the allstar race had some problems with there holley carbs . true or flase ?? Jim Hanig

Bernie Cunningham · 06-19-2007, 01:18 AM

Hey jim,
Travis had a problem with the holleys on a couple of the BBC cars that had the '4 corner idle circuits'. They don't come that way but it really doesn't affect performance down track, it only helps driveability around the pits and idle.
He's right, but, is it a down track performance issue?

Jim Hanig · 06-19-2007, 10:26 PM

Thanks Bernie Terry is the one that said he had heard it . JHanig

Oldtimer · 06-20-2007, 12:10 AM

What was the outcome ??

bp4133 Bob Pagano

RocketBlock · 06-20-2007, 01:09 AM

That better idle and transition circuit is included on Holley race carbs for a reason. And it is not for better in town driving. And if it wasn't an improvement to a race car, those racers would not have applied the technology. Would be a waste of money. A clean leaving stocker does have an advantage. Nice try.

Mark Tallent · 06-20-2007, 01:16 AM

I don't think any of the "FACTORY" carbs had 4 corner metering blocks, If so you also get them for the 428 "735" Carb.

Adger Smith · 06-20-2007, 07:36 AM

I have a 3310-1 780 carb that David Cook did. It is the Vac carb that is legal as a 750 in some comp & SS classes. I have done some testing with it in my SS/DS car. Before I paid David & started testing I had Wesley check out the carb. He made no mention of the carb having 4 corner idle.
I really don't see that it is a big thing because I have cleaned up the idle circuits on non 4 corner carbs when I do dyno testing of the engine. It is no big deal to change air bleeds & fuel bleeds. It just isn't as adjustable as with a screwdriver. I agree the screws & outside of the metering block don't look stock. (like the original carb) I would like to know the out come because I was about to let Kevin Helms try this carb on his 396 combo. I would like to give David a pat on the back. This carb had a very nice fuel curve, right out of the box...

Adger Smith

Alan Roehrich · 06-20-2007, 08:26 AM

I wonder if that falls under the "new" rule that the carburetor must be the same brand and model, as well as having the same venturi and throttle plate size? I wrote a letter, and sent an email, to Glendora a while back, with a list of Holley carburetors the same size and model as the one required for the car, and they said any of them could be used. A couple were newer carburetors with 4 corner idle circuits. I think one or two may have even had a different type of booster venturi. In any event, we bought a carburetor with the correct list number for the car and had that one built. Just to make tech easier and prevent questions. It does not have 4 corner idle circuits.

Alan Roehrich

Bring "AA" classes to NHRA Stock Eliminator!

Adger Smith · 06-20-2007, 03:26 PM

Alan,
I think the booster issue is avalid one. There are flow advantages to some types as well as signal & fuel mixing. I have seen photos in an NHRA Tech's book about correct boosters. I know the Hemi guys are having to use the correct boosters, Non down leg & Down leg, where they were originally used. I just don't see the 4 corner idle being as big an issue as the boosters. As I have said before, a good tuner can clean up the idle & response without 4 corner idle. It is just easier to retune for atmospheric & other changes with the metering block screws. What was the out come of the concerns that Travis had?

Adger Smith

Alan Roehrich · 06-20-2007, 06:45 PM

Adger, I'm not sure, maybe they simply didn't look to see if the boosters were different. I agree, there is a real difference in flow between the three different booster designs. We were looking at what carburetors we could run as replacements rather than spend big bucks for the original number. We were wanting to find an accepted replacement that matched the original, so we could go through tech with no worries. Turns out some of our great racer friends took care of us with a killer deal on the right carburetor.

Alan Roehrich

Bring "AA" classes to NHRA Stock Eliminator!

06-19-2007, 12:52 AM	#1
Jim Hanig Senior Member Join Date: Aug 2006 Location: Pukwana SD Posts: 860 Likes: 554 Liked 99 Times in 49 Posts	Carbs I heard a couple of racer iat the allstar race had some problems with there holley carbs . true or flase ?? Jim Hanig

06-19-2007, 01:18 AM	#2
Bernie Cunningham Senior Member Join Date: Jun 2002 Location: Southern California Posts: 560 Likes: 45 Liked 52 Times in 17 Posts	Hey jim, Travis had a problem with the holleys on a couple of the BBC cars that had the '4 corner idle circuits'. They don't come that way but it really doesn't affect performance down track, it only helps driveability around the pits and idle. He's right, but, is it a down track performance issue? __________________ Bernie Cunningham 7053 STK

06-20-2007, 12:10 AM	#4
Oldtimer Junior Member Join Date: Jul 2002 Location: Arkansas Posts: 87 Likes: 0 Liked 0 Times in 0 Posts	What was the outcome ?? bp4133 Bob Pagano __________________ Bob Pagano L88BOB@aol.com www.dyainc.org 4033 AA/SA

06-20-2007, 01:16 AM	#6
Mark Tallent Junior Member Join Date: Feb 2003 Posts: 41 Likes: 0 Liked 0 Times in 0 Posts	I don't think any of the "FACTORY" carbs had 4 corner metering blocks, If so you also get them for the 428 "735" Carb. __________________ Mark Tallent 7724 STK, SS

06-20-2007, 07:36 AM	#7
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	I have a 3310-1 780 carb that David Cook did. It is the Vac carb that is legal as a 750 in some comp & SS classes. I have done some testing with it in my SS/DS car. Before I paid David & started testing I had Wesley check out the carb. He made no mention of the carb having 4 corner idle. I really don't see that it is a big thing because I have cleaned up the idle circuits on non 4 corner carbs when I do dyno testing of the engine. It is no big deal to change air bleeds & fuel bleeds. It just isn't as adjustable as with a screwdriver. I agree the screws & outside of the metering block don't look stock. (like the original carb) I would like to know the out come because I was about to let Kevin Helms try this carb on his 396 combo. I would like to give David a pat on the back. This carb had a very nice fuel curve, right out of the box... Adger Smith __________________ Adger Smith (Former SS)

06-19-2007, 10:26 PM	#3
Jim Hanig Senior Member Join Date: Aug 2006 Location: Pukwana SD Posts: 860 Likes: 554 Liked 99 Times in 49 Posts	Thanks Bernie Terry is the one that said he had heard it . JHanig

06-20-2007, 01:09 AM	#5
RocketBlock Junior Member Join Date: Jan 2003 Posts: 57 Likes: 0 Liked 0 Times in 0 Posts	That better idle and transition circuit is included on Holley race carbs for a reason. And it is not for better in town driving. And if it wasn't an improvement to a race car, those racers would not have applied the technology. Would be a waste of money. A clean leaving stocker does have an advantage. Nice try.

06-20-2007, 08:26 AM	#8
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,113 Likes: 1,571 Liked 1,826 Times in 414 Posts	I wonder if that falls under the "new" rule that the carburetor must be the same brand and model, as well as having the same venturi and throttle plate size? I wrote a letter, and sent an email, to Glendora a while back, with a list of Holley carburetors the same size and model as the one required for the car, and they said any of them could be used. A couple were newer carburetors with 4 corner idle circuits. I think one or two may have even had a different type of booster venturi. In any event, we bought a carburetor with the correct list number for the car and had that one built. Just to make tech easier and prevent questions. It does not have 4 corner idle circuits. Alan Roehrich Bring "AA" classes to NHRA Stock Eliminator! __________________ Alan Roehrich 212A G/S

06-20-2007, 03:26 PM	#9
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Alan, I think the booster issue is avalid one. There are flow advantages to some types as well as signal & fuel mixing. I have seen photos in an NHRA Tech's book about correct boosters. I know the Hemi guys are having to use the correct boosters, Non down leg & Down leg, where they were originally used. I just don't see the 4 corner idle being as big an issue as the boosters. As I have said before, a good tuner can clean up the idle & response without 4 corner idle. It is just easier to retune for atmospheric & other changes with the metering block screws. What was the out come of the concerns that Travis had? Adger Smith __________________ Adger Smith (Former SS)

06-20-2007, 06:45 PM	#10
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,113 Likes: 1,571 Liked 1,826 Times in 414 Posts	Adger, I'm not sure, maybe they simply didn't look to see if the boosters were different. I agree, there is a real difference in flow between the three different booster designs. We were looking at what carburetors we could run as replacements rather than spend big bucks for the original number. We were wanting to find an accepted replacement that matched the original, so we could go through tech with no worries. Turns out some of our great racer friends took care of us with a killer deal on the right carburetor. Alan Roehrich Bring "AA" classes to NHRA Stock Eliminator! __________________ Alan Roehrich 212A G/S