Weird fuel issue with 1050 dominator - Chevelle Tech
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post #1 of 24 (permalink) Old May 25th, 19, 7:45 PM Thread Starter
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Brian
 
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Weird fuel issue with 1050 dominator

Ran the car on the dyno for the first time today.
The afr was a little lean added 4 jets to the front made a pull but not much difference so we added 4 to the rear same thing not much difference.
We raised the floats and still not much change it was then that we noticed the site glasses turn to foam when it went full throttle. I lowered the fuel pressure from 6 to 4.5 psi and this helped but it still is foaming has anyone seen this before

https://youtu.be/mNTwNxZLINs

Thanks Brian
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post #2 of 24 (permalink) Old May 25th, 19, 8:01 PM
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Re: Weird fuel issue with 1050 dominator

A larger needle and seat will help reduce foaming. So will less pressure as you have already noticed.

I have no experience with the 1050, but have seen this in similar carbs.

Check this out......https://speedtalk.com/forum/viewtopic.php?t=43020 They have other ideas and cures.
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post #3 of 24 (permalink) Old May 25th, 19, 8:56 PM
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Re: Weird fuel issue with 1050 dominator

when you say not much difference do you mean afr or hp? have you looked at the plugs after each jet change? i assume this is a chassis dyno?
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post #4 of 24 (permalink) Old May 25th, 19, 9:08 PM Thread Starter
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Re: Weird fuel issue with 1050 dominator

Plugs looked close but a little lean afr was in the 13's for most of the pull yes chassis dyno I posted from my phone not sure if the video link works or not.
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post #5 of 24 (permalink) Old May 25th, 19, 9:12 PM
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Re: Weird fuel issue with 1050 dominator

Your link works. It did not post as a clickable link, so here's one that you can click on.

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post #6 of 24 (permalink) Old May 25th, 19, 9:16 PM Thread Starter
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Re: Weird fuel issue with 1050 dominator

Thanks...its pretty telling in the video not sure how much power if any its costing
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post #7 of 24 (permalink) Old May 26th, 19, 3:07 AM
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Re: Weird fuel issue with 1050 dominator

I've seen this before. It really causes problems if it happens a lot!




Almost looks like pump cavitation. I can't imagine all that air is a good thing. It could be sucking air before the pump.

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post #8 of 24 (permalink) Old May 26th, 19, 4:51 PM
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Re: Weird fuel issue with 1050 dominator

What do you have on the feed side of the pump? If there is a restriction on the feed side, it would/could starve the pump causing a cavitation.

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Engine parts: (Heads, cam & lifters from Lewis Racing Engines)
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Holley Avenger MPFI
612HP/594TQ
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post #9 of 24 (permalink) Old May 26th, 19, 6:18 PM
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When I had my car Dale Cubic told me the same thing. You want low pressure yes, but full bowls too. Right up to the top of the glass. Low level causes splashing. I canít help on the needles, I donít remember what i had in my 1150.
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post #10 of 24 (permalink) Old May 26th, 19, 6:33 PM Thread Starter
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Re: Weird fuel issue with 1050 dominator

So to add to the saga I went to the track today.... the car was already in the trailer from yesterday so I couldn't resist.
I made 4 passes car ran great pulled hard always down the track.
I just looked at a video I did of the afr readings going down the track and now it looks fat like high 11's to low 12's. I am thinking that the fuel foaming I saw on the dyno didn't happen going down the track...weird

Also meet fellow TCer Mr Particular nice guy

Brian
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post #11 of 24 (permalink) Old May 26th, 19, 6:41 PM
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Re: Weird fuel issue with 1050 dominator

Pull your adjuster nut and lock screw and read what is printed on the flat of the needle. A larger the needle orifice, the less pressure drop over the area of the needle. Less pressure, less splash, less chance of vaporization due to the pressure drop at the seat. Keeping the bowls full + less splash too. Dropping pressure also helps, right up to the point where the bowls will not remain full.

Largest Holley or quick time needles I can find are .150.

https://www.holley.com/products/fuel...parts/18-12QFT

https://www.holley.com/products/fuel...arts/18-11SQFT

Notice the shape of the titanium seal vs viton seal. The round seal may offer less splash and reduced pressure drop over the increased area???
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post #12 of 24 (permalink) Old May 27th, 19, 8:22 AM
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Re: Weird fuel issue with 1050 dominator

You think the angle of the car at the track could have kept fuel closer to the needles and reduce foaming?


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post #13 of 24 (permalink) Old May 27th, 19, 10:33 AM Thread Starter
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[QUOTE=mrpaticular;11085160]You think the angle of the car at the track could have kept fuel closer to the needles and reduce foaming?[/Q4UOTE]

I really dont know what to think, I'm going to make some changes to the needles and upgrade the regulator and lines to the carb after those changes probably run it on the chassis dyno and see if it made any difference.
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post #14 of 24 (permalink) Old May 27th, 19, 11:22 AM
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Re: Weird fuel issue with 1050 dominator

you might want to put both fuel bowls in a 5 gallon bucket while holding them level above the bottom and turn the pump on to see if the fuel is being aereated
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post #15 of 24 (permalink) Old May 28th, 19, 12:20 PM
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Re: Weird fuel issue with 1050 dominator

[quote=B433;11085226]
Quote:
Originally Posted by mrpaticular View Post
You think the angle of the car at the track could have kept fuel closer to the needles and reduce foaming?[/Q4UOTE]

I really dont know what to think, I'm going to make some changes to the needles and upgrade the regulator and lines to the carb after those changes probably run it on the chassis dyno and see if it made any difference.
I think I would be making changes at the track only. The chassis dyno can't mimic the airflow over the carburetor and forces at speed.
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