nikki jetting
nikki jetting
What size jets are good to start tuning with for a nikki on a rb sized streetported 12a? I ported the manifold a little too. I just don't want it running too lean.
Well I have a edelbrock air/fuel meter and a G tech
You think the secondaries jets are will work, What do you think I should set the fuel pressure at 3?
You think the secondaries jets are will work, What do you think I should set the fuel pressure at 3?
Last edited by sand121; Dec 21, 2005 at 06:06 PM.
Airflow is my life
Joined: Aug 2002
Posts: 6,736
Likes: 2
From: Orlando, Fl
Leave the secs alone for now. Nikkis tend to run rich up top from the factory. I'd up the primaries like Zac said and go from there. Without changeable airbleeds you'll be limited to what you can do. You might find after the primaries are good that you can then up the secs. Nah run pressure around 2.5 psi.
Nikki-Modder Rex-Rodder
Joined: Feb 2001
Posts: 2,890
Likes: 14
From: Trying to convince some clown not to put a Holley 600 on his 12a.
If you're running a return, then 3 or 3.5 psi is fine. Factory specs call for 4.25 for the later years, 3.75 (I think) for the earlier years, with the difference being the return line orifice diameter.
Your stock secondary jets are 1.6 mm, or .063 inch, and your stock primary jets are .92 or .93 mm, or .036 inch.
The sec jets are PLENTY big enough for the venturi diameter, but the primary jets are a bit conservative.
We send the Sterlings out with the stock .063 inch secondary fuel jets, even though the venturi diameter is larger. The primaries are jetted with between 053 and .058 jets, or .043 for those requesting conservative jetting.
You have a SPed 12a and you're trying to get hi per from a 313 cfm carb.
If you send it to us, along with money (
), we can make it flow 465 cfm with practically no loss of signal to the main fuel circuit at low end. 
-An "oh so shameless" plug, I know.
Your stock secondary jets are 1.6 mm, or .063 inch, and your stock primary jets are .92 or .93 mm, or .036 inch.
The sec jets are PLENTY big enough for the venturi diameter, but the primary jets are a bit conservative.
We send the Sterlings out with the stock .063 inch secondary fuel jets, even though the venturi diameter is larger. The primaries are jetted with between 053 and .058 jets, or .043 for those requesting conservative jetting.
You have a SPed 12a and you're trying to get hi per from a 313 cfm carb.
If you send it to us, along with money (
), we can make it flow 465 cfm with practically no loss of signal to the main fuel circuit at low end. -An "oh so shameless" plug, I know.
Lorem ipsum dolor sit ame
Joined: Nov 2003
Posts: 3,262
Likes: 1
From: The Net
Originally Posted by Sterling
If you're running a return, then 3 or 3.5 psi is fine. Factory specs call for 4.25 for the later years, 3.75 (I think) for the earlier years, with the difference being the return line orifice diameter.
Your stock secondary jets are 1.6 mm, or .063 inch, and your stock primary jets are .92 or .93 mm, or .036 inch.
The sec jets are PLENTY big enough for the venturi diameter, but the primary jets are a bit conservative.
We send the Sterlings out with the stock .063 inch secondary fuel jets, even though the venturi diameter is larger. The primaries are jetted with between 053 and .058 jets, or .043 for those requesting conservative jetting.
You have a SPed 12a and you're trying to get hi per from a 313 cfm carb.
If you send it to us, along with money ( ), we can make it flow 465 cfm with practically no loss of signal to the main fuel circuit at low end.
-An "oh so shameless" plug, I know.
Your stock secondary jets are 1.6 mm, or .063 inch, and your stock primary jets are .92 or .93 mm, or .036 inch.
The sec jets are PLENTY big enough for the venturi diameter, but the primary jets are a bit conservative.
We send the Sterlings out with the stock .063 inch secondary fuel jets, even though the venturi diameter is larger. The primaries are jetted with between 053 and .058 jets, or .043 for those requesting conservative jetting.
You have a SPed 12a and you're trying to get hi per from a 313 cfm carb.
If you send it to us, along with money (
), we can make it flow 465 cfm with practically no loss of signal to the main fuel circuit at low end. -An "oh so shameless" plug, I know.
Hey Dennis
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Nikki-Modder Rex-Rodder
Joined: Feb 2001
Posts: 2,890
Likes: 14
From: Trying to convince some clown not to put a Holley 600 on his 12a.
Where you at now, Carlos?
Were you able to find a place to live hamoniously with others who also came out of the closet late in life?
Were you able to find a place to live hamoniously with others who also came out of the closet late in life?
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