those back flaps may not open until 4000 rpm under load
Dual quads versus big hammer!!!...
- Thread starter j par
- Start date
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K.O. SWINGER
Meeting in the alley since 1976
Just ay observation but we all know that the best throttle response usually comes from a smaller carburetor. The best throttle response I ever had was with the thermal quad and an M1 single plane. Very small primaries . your primary consists of opening a whole 4 Barrel at once a snap off low RPMs May Never Be achievable.
j par
Well-hung Member
If you look at the carbs reviews and even the tuning kit reviews everybody and I mean everybody is saying they are way too rich out of the box.. nowhere have I found or somebody said they had to put richer or larger jet's in them.. times that by 2 and I may have a extremely rich situation...
PRH
Well-Known Member
Just keep leaning the primary jets down until the numbers are more normal, or it starts to lean surge.
If it lean surges before the numbers look right...... might need to question the gauge.
If it’s lean surging and the numbers still look too rich, jet up in small increments just until it runs right.
Running right always counts more than what the gauge reads.
In other words..... I don’t care if the gauge is reading perfection..... if it runs crappy....... I’m not leaving it like that.
You bought the doors...... try some holes. That why you got em.
If it lean surges before the numbers look right...... might need to question the gauge.
If it’s lean surging and the numbers still look too rich, jet up in small increments just until it runs right.
Running right always counts more than what the gauge reads.
In other words..... I don’t care if the gauge is reading perfection..... if it runs crappy....... I’m not leaving it like that.
You bought the doors...... try some holes. That why you got em.
j par
Well-hung Member
I totally agree! I just put a brand new Bosch O2 sensor and and everything seems to be working normal with it once again. I have new metering rods coming tomorrow which again I'm not sure exactly when I'll get a chance. Also the weather is going to turn Friday and Saturday for the worse but next week looks great. anyways I'll try the fatter metering rods and trying to get it clean and get the idle mixture screws to a normal setting. From what I gather if you're in more than 1 1/2 turns in you need leaner Jets, if you're out past two and a half turns you need fatter jets. and right now I brought them into about one turn and it's starting to run better. Also the O2 sensor or gauge is showing more normal readings.
PRH
Well-Known Member
I know someone who put 2 Ede 650 AVS’s on a 471 Hemi with ported heads and a roller cam.
They had to jet way way down.
With the ootb jetting, the A/F ratio was in the 10’s.
On the other hand, I had a 557 with 2 Carter 750’s on the dyno once....... couldn’t get it rich enough.
I ended up with .119 jets in all 8 holes.
They had to jet way way down.
With the ootb jetting, the A/F ratio was in the 10’s.
On the other hand, I had a 557 with 2 Carter 750’s on the dyno once....... couldn’t get it rich enough.
I ended up with .119 jets in all 8 holes.
j par
Well-hung Member
Tons is what I've been getting and 11th and finally yesterday when I screwed them damn idle mixture screws weigh-in I finally started seeing numbers I recognized.. I just got my tracking order for the Jets and of course they're coming from Texas dammit! LOL via USPS... AKA slow pack mule LOL...
j par
Well-hung Member
hey that reminds me I should go pull plug or to see what they look like after it was running on a little bit better..
j par
Well-hung Member
#3
#1
#1
j par
Well-hung Member
If I can get it to run an even better by rejetting or the metering rods I'll probably buy another set of plugs and run it for a little bit.. actually probably will buy a set of plugs either way.. just so I can get a fresh read..
one step hotter plug would help clean that up.... (I've said this before I think... LOL)
j par
Well-hung Member
I thought it was funny how the two plugs look a bit different especially on the porcelain. I'm getting about two or three rings of heat. I know the angle on that one doesn't look so but I've already went a little bit hotter than I used to be before..
of course when I put those aluminum heads on they want you to run a colder plug and also let's not forget about the other thing that I'm going to try that wants two heat ranges colder...
yellow rose
Overnight Sensation
j par
Well-hung Member
Well surprise surprise USPS says tomorrow for the Jets. I should get everything else today. Of course Friday and Saturday they're predicting rain and possible snow. But after that nothing but sunny skies for the next week. I'm trying to schedule Monday off and possibly a half a day Wednesday off. The days are starting to get longer as well so I will be able to do some tuning after work I believe if the weather holds... Stay tuned... (Pun intended....)
Again from everything I've been reading in researching everybody is saying these carbs are rich, and I mean everybody. No one should I read where somebody said it was lean and they needed to put bigger Jets. So I have to Rich carbs. What I ordered are the leanest Jets and the fattest rods. Again my idle mixture screws are too far in. They should be out at least a turn and a half and they're out one turn and it's just starting to run good... The metering Rod should be here when I get off work and possibly I could give those a try....
Again from everything I've been reading in researching everybody is saying these carbs are rich, and I mean everybody. No one should I read where somebody said it was lean and they needed to put bigger Jets. So I have to Rich carbs. What I ordered are the leanest Jets and the fattest rods. Again my idle mixture screws are too far in. They should be out at least a turn and a half and they're out one turn and it's just starting to run good... The metering Rod should be here when I get off work and possibly I could give those a try....
Have you read where everyone has to lean these carbs out because OOTB they are rich? Have you read that? If not, go read what the reviews are....
Hey Jpar! I was just reading the reviews on line, seems everyone is saying these come rich out of the box. Have you read that???
j par
Well-hung Member
As I sit here and reflect on the two conversations I had with lwa performance that did this dual quad setup I think about the first conversation I had with the engine builder. Him saying that he's no engine tuner but can tell me what he sees them doing on the dyno... He said that they really keep pointing things out till there's a problem and then back it up a little bit. What seems to be the direction that I'm trying to head in. Second conversation wasn't as productive as it was the son of the owner more telling me that he was the one that did the tuning for the article and it was all done using a dyno. I didn't offer early any thing that he tried or that he had to make the carbs leaner or richer or really anything. Honestly and reflection a little smug.. where has the engine builder guy was very kind and tried to offer anything he could to help the situation..
One other seat of the pants thing and this is taking into consideration all the stopping and starting warming up driving and tuning... I do seem to be using more fuel than usual....
One other seat of the pants thing and this is taking into consideration all the stopping and starting warming up driving and tuning... I do seem to be using more fuel than usual....
j par
Well-hung Member
j par
Well-hung Member
Are you really reading up on the stuff or just mocking me?I don't know if you have any experience with the forum but when a thread gets kind of long people don't generally read back everything that said so sometimes you have to reiterate...
LOL... just mocking you.... you've stated that about 4 times per page. And you posted it again today....
MiradaMegaCab
Well-Known Member
Blow the doors off your competition. Pun intended. ;)
It may not be his car.... the reviews online say these are rich OOTB. J par, did you read the reviews on these carbs???
j par
Well-hung Member
@yellow rose remember this suggestion and conversation? They sent me the wrong stuff! LOL just when I was giving one of those kids on the tech line some credit.. they sent me four of these old divider plates that go down in the secondaries... Absolutely no use.. I'll call again tomorrow morning and see if I can get them to send the right thing...
bummer, man.
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