Thought I'd share my latest video.
If I understand you correctly, you are saying your car ran faster with a 850. Not surprising at all, and goes hand in hand with the video in the fact of letting the car decide.cool vid....explain this though.....
my 340 with 750DP, using the formula (which I don't use)..340 x max rpm 6200=21080000 div x 3456=609cfm engine requirement
with an 850DP still 609cfm but car ran almost 2/10nths quicker in 1/4.
??
If I understand you correctly, you are saying your car ran faster with a 850. Not surprising at all, and goes hand in hand with the video in the fact of letting the car decide.
I think Hot Metal was speaking on ET only with his 850 DP. Maybe I missed your point, but nothing in the video said anything against spread bore carbs. I love spread bore carbs. Gas mileage was DP vs VS. And as far as CFM's, the TQ was advertised as 800 cfm's and was on top of 318's from the factory, which helps prove the "cfm" myth I speak of in the video.I will not dispute that "within a window" ET and performance has some "slopover" and some of that may or may not be individual carb tuning. But an 850 dbp with those great big front barrels vs a small primary anything does not fly with me. And I'm old enough "I was there."
I think Hot Metal was speaking on ET only with his 850 DP. Maybe I missed your point, but nothing in the video said anything against spread bore carbs. I love spread bore carbs. Gas mileage was DP vs VS. And as far as CFM's, the TQ was advertised as 800 cfm's and was on top of 318's from the factory, which helps prove the "cfm" myth I speak of in the video.
LOL.. I actually put a TQ on a /6 too. Once I put a 750 DP on a /6 just to show I could get it to run as good as the 2bbl on the super six. Fun times. I'm kind of done proven things... lolTrue, but the TQ is a totally different animal and cannot be compared to anything with mechanical secondaries, much less a double pumper. Since the TQ is a 100% vacuum secondary carburetor, that means its 850 CFM rating is only at maximum flow. If the engine doesn't need 850 CFM, it won't draw it. A better way to say it is, the TQ will flow "up to" 850 CFM as the engine demands it. If the engine demands less, then that's what it gets. I can tune (and have) an 800 TQ to run on a slant six.......and it ran QUITE good. I know I'm preachin to the choir hear, because you know all this.......but maybe some others do not. While I agree with your basic point, I disagree that the TQ comparison helps prove your CFM myth, because it is a totally different style carburetor than you are comparing it to.
Exactly, forget all the cfm formulas for anything racey...yes faster with 850 than 750 and everyone in the class I ran in said my carb was too big. Even a guy that ran a Rover 3500cc V8 put my 850 on and ran 2/10tnths faster, he couldn't believe it, were talking 215ci but it was astick car and he revved it to the moon.
True, but the TQ is a totally different animal and cannot be compared to anything with mechanical secondaries, much less a double pumper. Since the TQ is a 100% vacuum secondary carburetor, that means its 850 CFM rating is only at maximum flow. If the engine doesn't need 850 CFM, it won't draw it. A better way to say it is, the TQ will flow "up to" 850 CFM as the engine demands it. If the engine demands less, then that's what it gets. I can tune (and have) an 800 TQ to run on a slant six.......and it ran QUITE good. I know I'm preachin to the choir hear, because you know all this.......but maybe some others do not. While I agree with your basic point, I disagree that the TQ comparison helps prove your CFM myth, because it is a totally different style carburetor than you are comparing it to.
The TQ is a mechanical secondary carb. Just like the AVS. Just like the Holley double pumper. The AVS is technically a VS carb but the 1850 and 3310 are the only real VS carbs out there.
I'm in the process of testing a 4479 on a Briggs and Stratton. lolWTH?? No one gonna call me out on my 100 MPG carb comment?
I must be getting old or people have learned to ignore me better than I thought.
I assume that members have learned to trust your every word as the truth. LOLWTH?? No one gonna call me out on my 100 MPG carb comment?
I must be getting old or people have learned to ignore me better than I thought.
I assume that members have learned to trust your every word as the truth. LOL
That's right, the 4779 Holley 750 dual feed double pumper is a 100 MPG carb.
Downhill with a tail wind and the engine turned off! Isn't that what you meant?
Actually, we're both wrong regarding the TQ. I've always called it a vacuum secondary, but that's not entirely true. It's not mechanical either. Just like the quadrajet, it's a hybrid. The base plate is mechanical, yes. But the vacuum door controls the whole show. It can be controlled by rate of opening and amount of opening. You could essentially cut the secondary side OFF with the air door adjustment. That's NOT a mechanical secondary. And true, since the secondary throttle plates are not controlled by vacuum, it's not a vacuum secondary, either, but the secondary side is certainly controlled by vacuum, but not actuated by vacuum. The vacuum of the engine itself pulls the air door open. The vacuum of the engine also slows the door through the vacuum brake/choke pulloff, so vacuum plays a huge role in how the secondaries work, UNLIKE a 100% mechanical secondary carburetor like say, a Holley double pumper. THAT is a true mechanical secondary carburetor. The TQ and Q Jet are not.