Performance Boats Forum banner

1 - 14 of 14 Posts

·
Registered
Joined
·
436 Posts
Discussion Starter #1
I am running a RPM air gap and quick fuel 850 on my 460 Chevy. My under load jetting is right where I want it. My Idle mixture is rich on 1,7,6 and 4 wich is the lower half of the dual plane and the drivers side of the carb. I am assuming I need to lean up my idle mixture on this side of the carb. Does this sound right?
 

·
Registered
Joined
·
3,878 Posts
I am running a RPM air gap and quick fuel 850 on my 460 Chevy. My under load jetting is right where I want it. My Idle mixture is rich on 1,7,6 and 4 wich is the lower half of the dual plane and the drivers side of the carb. I am assuming I need to lean up my idle mixture on this side of the carb. Does this sound right?
NO!!! M
 

·
B.A.M aka "Black Azz Mike
Joined
·
2,925 Posts
460 chevy?? hil:)

FYI, that is a BBC that is bored .030 over. Obviously you just made yourself look like an idiothil:)hil:)hil:)hil:)hil:)

So before you laugh at someone else, make sure that you know what the fock your talking about....................
 

·
ATTA BOY
Joined
·
2,348 Posts
FYI, that is a BBC that is bored .030 over. Obviously you just made yourself look like an idiothil:)hil:)hil:)hil:)hil:)

So before you laugh at someone else, make sure that you know what the fock your talking about....................
Let him catch his breath next time.........................FLMAO

hil:)hil:)hil:)hil:)
 

·
jetboataholic
Joined
·
2,798 Posts
Thanks, Now back to my question on my Chevy 460 11to1 .030 over 454 Chevy, anyone:)
Take ol guy's advice!!!!! He knows his shit!!!! NO!!! (Which I took as meaning don't lean it out, fat is good), am I right???:)Unsure
 

·
Registered
Joined
·
436 Posts
Discussion Starter #8
All I am doing is trying to do is fine tune it for idle. Power mixture is where I want it. 1,7,4and 6 are very rich at idle only, they are also on the same side of the carb since I am running a dual plane intake. I have to idle it quite a long time since the no wake zone is almost a half mile long. seems like it should be idle mixture on one side of the carb only.
 

·
Registered
Joined
·
2,135 Posts
Since its a QFT carb Im going to assume that it has 4 idle mixture screws? Have you adjusted them? A general rule of thumb will be to open each of them up until the RPM's stop increasing. Watch the tach. Sometimes the effect is subtle, but you do all 4 (I like to go around twice) and that could help...
 

·
E-7 Sheepdog (ret)
Joined
·
6,834 Posts
Idle mixture has no correlation to main metered mixture. Yes, adjust your idle mixture to be correct. It will not alter your main circuit power mixture at all.
 

·
Registered
Joined
·
436 Posts
Discussion Starter #12
Since its a QFT carb Im going to assume that it has 4 idle mixture screws? Have you adjusted them? A general rule of thumb will be to open each of them up until the RPM's stop increasing. Watch the tach. Sometimes the effect is subtle, but you do all 4 (I like to go around twice) and that could help...
I nailed the mixture on the second try, kinda a pain when on the idle since the lake is 4600 feet and I live at 6600. I'll go around again but just needed an opinion to make sure my thinking was right , Thanks.
 

·
Registered
Joined
·
436 Posts
Discussion Starter #13
If he is runing rich at idle (and seems to have a good understanding of the dual plane manifold), why shouldn't he lean it out????
Thanks for getting it:) I may sometimes sound like a tard on this sight, but I kinda know what I am doing just like to get opinions.
 

·
Registered
Joined
·
2,135 Posts
I nailed the mixture on the second try, kinda a pain when on the idle since the lake is 4600 feet and I live at 6600. I'll go around again but just needed an opinion to make sure my thinking was right , Thanks.
Bingo! They are so complicated!
 
1 - 14 of 14 Posts
Top