Street Demon or Edelbrock AVS2 or ?

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Ahhhhh yes, the great Holley 4150 carb design.....
- the one with the mickey mouse power valve [ PV ] arrangement that NOBODY else uses....
- the PV that uses rubber, that over time becomes affected by heat, & changes the PV value.
- where the PV fuel cavity has the feed holes to the main well half way up the cavity...which means the fuel has to fill up the cavity to reach the holes before fuel can enter the MW. This all takes TIME which causes a delay in fuel enrichment...
- the torturous path the fuel has to take to even get the MW causes a delay in response. These carbs can never have the tip in response of a met rod carb.
- leakage of the acc pump fuel, which took YEARS to fix by using a brass tube with o rings.

All first year engineering student stuff & it took years for the faults to be corrected.

AFB, AVS & TQ carbs did not have any faults/modifications needing correction, they were perfect from day one....
 
600 Holley v 625 AFB. More tq, more hp, less fuel doing it....

img245.jpg
 
Bewy said:
AFB, AVS & TQ carbs did not have any faults/modifications needing correction, they were perfect from day one....
Click to expand...

I guess you forgot about the plastic bodies on the Thermobogs warping from the engine heat :rolleyes: :rolleyes: :rolleyes:
 
stroked340 said:
I guess you forgot about the plastic bodies on the Thermobogs warping from the engine heat :rolleyes: :rolleyes: :rolleyes:
Click to expand...

That was usually an excuse guys used who forgot to remove the "hidden" main body screws in the middle of the carb and "warped" the main body trying to pry it off with a screwdriver. Funny thing the TQ was actually developed as a performance-oriented response to the Quadrajet, it just happened to get finished when emissions started to get going and ended up having a bunch of junk attached to it to make it run better with super lean mixtures and EGR.
 
stroked340 said:
I guess you forgot about the plastic bodies on the Thermobogs warping from the engine heat :rolleyes: :rolleyes: :rolleyes:
Click to expand...

Never had that problem. Guess again? Some people have problems while others never do. Been running TQ's for 40 years. 71 and 72 models. Loved people like you, used to get a lot of great carbs cheap or free. By the way, a lot of "race" stuff does not mean it is better for the street. The TQ was good for as much as .2 in the quarter mile on an automatic car and no gain on a 4 speed over a Holley, Ed Hamburger. Dream on.

Torque Specs.JPG
 
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Bewy said:
Ahhhhh yes, the great Holley 4150 carb design.....
- the one with the mickey mouse power valve [ PV ] arrangement that NOBODY else uses....
- the PV that uses rubber, that over time becomes affected by heat, & changes the PV value.
- where the PV fuel cavity has the feed holes to the main well half way up the cavity...which means the fuel has to fill up the cavity to reach the holes before fuel can enter the MW. This all takes TIME which causes a delay in fuel enrichment...
- the torturous path the fuel has to take to even get the MW causes a delay in response. These carbs can never have the tip in response of a met rod carb.
- leakage of the acc pump fuel, which took YEARS to fix by using a brass tube with o rings.

All first year engineering student stuff & it took years for the faults to be corrected.

AFB, AVS & TQ carbs did not have any faults/modifications needing correction, they were perfect from day one....
Click to expand...

People in the know use a power valve. A far better design than a metering rod.


You don’t have to buy a junk Holley. They had always been questionable.

But there are clones out there that are far better than a Holley.

Your claims make you sound like a cry baby.
 
RB,
Power valve better than met rod, ignorance showing...again...
If you choose to use a H or clone, you are stuck with a PV.
People in the know were Chrysler & GM engineers, & they used met rod carbs....
 
Post #77 dyno test. Edel ran the test, says at the top.
17 hp more & 17 ftlbs more from the AFB & it used less fuel doing it.
 
Dyno report in post #77. Hopefully this is a little clearer.

img248.jpg
 
Bewy said:
RB,
Power valve better than met rod, ignorance showing...again...
If you choose to use a H or clone, you are stuck with a PV.
People in the know were Chrysler & GM engineers, & they used met rod carbs....
Click to expand...

In street applications they did. Holleys were available as part of the dealer performance packages and all of the racing setups used them spec'd from the factory. Max Wedges and Race Hemis were set up with Holleys. I have an MP engine "bible" and it specifies one of the first steps when modifying any setup for performance is putting on a Holley carb. That book is basically a compilation of official Chrysler performance bulletins from Chrysler engineers.
 
MopaR&D said:
In street applications they did. Holleys were available as part of the dealer performance packages and all of the racing setups used them spec'd from the factory. Max Wedges and Race Hemis were set up with Holleys. I have an MP engine "bible" and it specifies one of the first steps when modifying any setup for performance is putting on a Holley carb. That book is basically a compilation of official Chrysler performance bulletins from Chrysler engineers.
Click to expand...


Bewy can’t tune a Holley so keep that in mind.

For DECADES Holley and a host of others have vehemently taught the exact wrong way to tune the power valve circuit. Because of that, guys like Bewy call the power valve a curse when in reality it’s the best system going.

You can tune the main jet without affecting the power valve, and you can tune the power valve without affecting the main jet. Doesn’t work that way with a metering rod.

No one making power (unless rules makes them) uses anything other than a Holley.

Another myth (or lie depending on your mindset) is that the Carter/Edelbrock/Demon/TQ/QJ or any carb other than a Holley is “bolt on a go”. They are not.

Rule number one of testing is don’t condemn a part if you don’t do a full tune of the new part.

Trying to test two parts (or more) by just bolting them on is just magazine bullshit.
 
MopaR&D said:
In street applications they did. Holleys were available as part of the dealer performance packages and all of the racing setups used them spec'd from the factory. Max Wedges and Race Hemis were set up with Holleys. I have an MP engine "bible" and it specifies one of the first steps when modifying any setup for performance is putting on a Holley carb. That book is basically a compilation of official Chrysler performance bulletins from Chrysler engineers.
Click to expand...

Sorry, Max Wedges had Carter AFB's. Race Hemi's, Six Packs, and some early 70's big blocks had Holleys. Not something that lasted long for what ever reason. Premium GM engines used Carters like Cadillac, Oldsmobile, Pontiac and Buick as well as some HP Chevrolet untill the Q-Jet came out. Some extreme Chevrolet Performance engines came with a Holley.
 
RB,
I can tune Holleys & lots of other brands of carbs that you could never tune. Holleys are so crude that dumb & dumber can 'tune' them. Let us know when you have worked out how an air bleed works.....
 
Not until the Comp Series TQ came out in 1969 was there a Carter carb larger than 750 cfm. The rare exception, & veeeery rare carb, was the three bbl 'trapdoor' AFB made for race Pontiacs in the early 60s.
So engines that needed more airflow used the H rubbish.
 
Bewy said:
RB,
I can tune Holleys & lots of other brands of carbs that you could never tune. Holleys are so crude that dumb & dumber can 'tune' them. Let us know when you have worked out how an air bleed works.....
Click to expand...

You can see it with an A/F meter on a dyno very easily.


Once again because you are wrong and love to pump the World Wide Web with bullshit…

A smaller main air bleed STARTS the mains LATER
A larger main air bleed STARTS the mains SOONER.

Thats how it works in the real world. Just because you can’t figure it out doesn’t mean you have to dumb down everyone else.
 
Here it is in a paragraph, not pages of mumbo jumbo. It is not rocket science...A smaller air bleed starts the system earlier...not later.

img249.jpg
 
66fs said:
Never had that problem. Guess again? Some people have problems while others never do. Been running TQ's for 40 years. 71 and 72 models. Loved people like you, used to get a lot of great carbs cheap or free. By the way, a lot of "race" stuff does not mean it is better for the street. The TQ was good for as much as .2 in the quarter mile on an automatic car and no gain on a 4 speed over a Holley, Ed Hamburger. Dream on.

View attachment 1716084138
Click to expand...
The only reason any TQ body ever warped was because of increased under hood temps caused by all the emissions equipment through the smog years, mainly the catalytic converter. Anyone who used one in a performance application will have their engine running much cooler than a smog era car and there'll never be a problem.
 
Bewy said:
RB,
I can tune Holleys & lots of other brands of carbs that you could never tune. Holleys are so crude that dumb & dumber can 'tune' them. Let us know when you have worked out how an air bleed works.....
Click to expand...
Whatchyootawkinbout? You caint even tune your toilet. LOL
 
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