Starting line hesitation

Monte Howard · 07-12-2015, 04:07 PM

Since Danny built it, I am ruling out the air door to loose. I would try a new choke pull-off, I have had several of them go bad and cause the same issue. Pull the vacum hose off and push the arm in, with the arm pushed in hold your finger over the vacum port. Let go your finger off the vacum port and make sure the arm comes out smoothly. If it starts coming out and then hangs up for a second it's bad.

Mike Pearson · 07-13-2015, 11:50 AM

Quote:

Originally Posted by Monte Howard

Since Danny built it, I am ruling out the air door to loose. I would try a new choke pull-off, I have had several of them go bad and cause the same issue. Pull the vacum hose off and push the arm in, with the arm pushed in hold your finger over the vacum port. Let go your finger off the vacum port and make sure the arm comes out smoothly. If it starts coming out and then hangs up for a second it's bad.

Let us know if you figure out the stumble in your carb. We have a Danny Ashley prepared Q jet that does the same thing and we have not been able to get it fixed. It's a real nice carb and Danny does nice work so we would realy like to get it running right.

DIV3CR · 07-13-2015, 12:42 PM

In the instruction from Danny that come with The carb it said
that the brass plate fit in a machine groove in the carb top
and I have double check the plate and it is in the groove.
If I find a answer I will post it.
Thanks for everybody's help
Bob Keller

njk53 · 07-13-2015, 12:52 PM

Don't you guys think 6 psi. of fuel pressure is a bit low? We had a Dean Oliver prepared carburetor and currently have a Hedworth prepared unit and we ran both carbs. at 7 psi. and both perform nicely. Is it possible momentary fuel starvation is occurring considering a Q-Jets float bowl is so small?
Just a thought.

Mike Semeniuk · 07-13-2015, 01:26 PM

Fuel Pressure is related to the size of needle and seat, and float settings and of course demand. I need to run mine at 5.5 for best operation , anything over 6 and - too many issues

Mike Pearson · 07-13-2015, 01:37 PM

Quote:

Originally Posted by Mike Semeniuk

Fuel Pressure is related to the size of needle and seat, and float settings and of course demand. I need to run mine at 5.5 for best operation , anything over 6 and - too many issues

Mine runs good at 6 lbs too.

Cdncarnut · 07-13-2015, 02:00 PM

I am running a Joe Scott at 7 psi with no issues.
My Ashley was also running at that same pressure.

07-12-2015, 04:07 PM	#1
Monte Howard Member Join Date: Nov 2002 Location: Potomac,IL Posts: 279 Likes: 1 Liked 71 Times in 23 Posts	Re: Starting line hesitation Since Danny built it, I am ruling out the air door to loose. I would try a new choke pull-off, I have had several of them go bad and cause the same issue. Pull the vacum hose off and push the arm in, with the arm pushed in hold your finger over the vacum port. Let go your finger off the vacum port and make sure the arm comes out smoothly. If it starts coming out and then hangs up for a second it's bad. __________________ Monte Howard 3209 STK, 3208 SS

07-13-2015, 12:42 PM	#3
DIV3CR Junior Member Join Date: Oct 2011 Location: WISCONSIN Posts: 50 Likes: 0 Liked 3 Times in 1 Post	Re: Starting line hesitation In the instruction from Danny that come with The carb it said that the brass plate fit in a machine groove in the carb top and I have double check the plate and it is in the groove. If I find a answer I will post it. Thanks for everybody's help Bob Keller

07-13-2015, 12:52 PM	#4
njk53 Senior Member Join Date: Jul 2007 Location: East China, MI Posts: 504 Likes: 0 Liked 0 Times in 0 Posts	Re: Starting line hesitation Don't you guys think 6 psi. of fuel pressure is a bit low? We had a Dean Oliver prepared carburetor and currently have a Hedworth prepared unit and we ran both carbs. at 7 psi. and both perform nicely. Is it possible momentary fuel starvation is occurring considering a Q-Jets float bowl is so small? Just a thought. __________________ Nelson Kowal Stock 345 Last edited by njk53; 07-13-2015 at 12:56 PM.

07-13-2015, 01:26 PM	#5
Mike Semeniuk Junior Member Join Date: Aug 2004 Location: Sherwood Park, Alberta Posts: 99 Likes: 19 Liked 6 Times in 2 Posts	Re: Starting line hesitation Fuel Pressure is related to the size of needle and seat, and float settings and of course demand. I need to run mine at 5.5 for best operation , anything over 6 and - too many issues __________________ Mike Semeniuk 632 GTMA

07-13-2015, 02:00 PM	#7
Cdncarnut Member Join Date: Jul 2012 Posts: 213 Likes: 386 Liked 56 Times in 31 Posts	Re: Starting line hesitation I am running a Joe Scott at 7 psi with no issues. My Ashley was also running at that same pressure. __________________ Thomas NHRA 1959 D/SA