Motor is in!
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Mountain Pass
Joined: Feb 2019
Posts: 243
Likes: 1
Motor is in!
Thread Starter
|
Mountain Pass
Joined: Feb 2019
Posts: 243
Likes: 1
Timing is good
Here are a few running clips
dropped in gear at and starts to die
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Cargo Master
Joined: Oct 2011
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From: Kenner,La.
Off idle stumble
You have some cam overlap that is making you compensate with having the throttle blades past the idle circuit and into the power valve circuits.
The cure takes some experimenting with drilling a small hole in each of the primary throttle plates. If you contact the Holley technical people tell them which cam combination, headers and any other modifications you have and they will be able to advise you on the correct power valve and what size hole to drill in the plates. Also do you have a balance tube between the headers, that also helps to smooth out off idle problems.
The sweet spot will be when you only need around 1/2 of a turn on the idle stop screw, and 1.5 from lightly seated on the idle metering screws.
The cure takes some experimenting with drilling a small hole in each of the primary throttle plates. If you contact the Holley technical people tell them which cam combination, headers and any other modifications you have and they will be able to advise you on the correct power valve and what size hole to drill in the plates. Also do you have a balance tube between the headers, that also helps to smooth out off idle problems.
The sweet spot will be when you only need around 1/2 of a turn on the idle stop screw, and 1.5 from lightly seated on the idle metering screws.
Thread Starter
|
Mountain Pass
Joined: Feb 2019
Posts: 243
Likes: 1
You have some cam overlap that is making you compensate with having the throttle blades past the idle circuit and into the power valve circuits.
The cure takes some experimenting with drilling a small hole in each of the primary throttle plates. If you contact the Holley technical people tell them which cam combination, headers and any other modifications you have and they will be able to advise you on the correct power valve and what size hole to drill in the plates. Also do you have a balance tube between the headers, that also helps to smooth out off idle problems.
The sweet spot will be when you only need around 1/2 of a turn on the idle stop screw, and 1.5 from lightly seated on the idle metering screws.
The cure takes some experimenting with drilling a small hole in each of the primary throttle plates. If you contact the Holley technical people tell them which cam combination, headers and any other modifications you have and they will be able to advise you on the correct power valve and what size hole to drill in the plates. Also do you have a balance tube between the headers, that also helps to smooth out off idle problems.
The sweet spot will be when you only need around 1/2 of a turn on the idle stop screw, and 1.5 from lightly seated on the idle metering screws.
