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 Post subject: Re: lack of performance
PostPosted: Fri Apr 23, 2021 9:55 pm 
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Joined: Fri Jul 08, 2016 2:19 pm
Posts: 81
Location: Odessa FL, Blairsville GA
Fat fingers.
New Plugs.


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 Post subject: Re: lack of performance
PostPosted: Sat Apr 24, 2021 5:17 am 
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Joined: Mon Oct 29, 2012 9:05 am
Posts: 2891
What's the fuel pressure set at?

I'm not saying it's not possible, but generally issues like this are carburetor/fuel related.

If your fuel pressure is over 5-6 psi, you'll get results like you're getting, and Edelbrock carbs are even more sensitive to fuel pressure.

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 Post subject: Re: lack of performance
PostPosted: Sat Apr 24, 2021 7:50 am 
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Joined: Fri Jul 08, 2016 2:19 pm
Posts: 81
Location: Odessa FL, Blairsville GA
It is a Pro Comp high pressure pump. They sent me that one by mistake, but said it should not blow the needles off the seats with Holleys, at least.


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 Post subject: Re: lack of performance
PostPosted: Sat Apr 24, 2021 8:07 am 
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Joined: Mon Oct 29, 2012 9:05 am
Posts: 2891
Ok, two things wrong with that last sentence.....LOL

1. No one should be within 27 miles of anything with the Pro Comp brand on it. Junk.

2. No carburetor needs a high pressure pump. None. Most carbs need regulated at 5-6 psi, MAX. I can run 1200 hp @ 8500 with 6 psi.

If you don't have a fuel pressure gauge, put one on and check. If it's too high, put a regulator on.

Too high fuel pressure will cause flooding, along with a myriad of other "rich" symptoms.

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 Post subject: Re: lack of performance
PostPosted: Sat Apr 24, 2021 8:26 am 
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Joined: Tue Nov 06, 2012 10:23 am
Posts: 1496
Location: Texas
blykins

You and your random 27 miles hahaha

Yes what Brent says, NO PRO-COMP

I had a Holley Blue pump. I thought I had to crank the pressure up to keep up with my engine but really the Blue Pump just was not happy supplying the flow. I had that pressure between 8-9 psi. Kept fouling plugs. I put a Holley Black pump and it stays around 5 psi - plugs better and does not suck bowls dry..


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 Post subject: Re: lack of performance
PostPosted: Sat Apr 24, 2021 9:29 pm 
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Joined: Fri Jul 08, 2016 2:19 pm
Posts: 81
Location: Odessa FL, Blairsville GA
I bought a Holley pressure regulator today to turn it down.
Hopefully, that helps.


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 Post subject: Re: lack of performance
PostPosted: Sun Apr 25, 2021 5:37 am 
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Joined: Mon Oct 29, 2012 9:05 am
Posts: 2891
What was the fuel pressure?

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 Post subject: Re: lack of performance
PostPosted: Tue Apr 27, 2021 12:52 pm 
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Joined: Mon Oct 29, 2012 2:39 pm
Posts: 1726
As above - need to know the number, you'll need a gauge on it. And you check with the engine running by the way. For gasoline, I stay in the 6~7 PSI range, prefer 6.5 with a Holley. They can handle up to 8 or so on Methanol. For Edelbrock carbs, 5~5.5 PSI.

G-rotor style pumps are the quietest on a street car. Mallory, Quick Fuel, Aeromotive are reliable brands I've used.

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 Post subject: Re: lack of performance
PostPosted: Wed Apr 28, 2021 8:34 am 
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Joined: Fri Jul 08, 2016 2:19 pm
Posts: 81
Location: Odessa FL, Blairsville GA
It was at about 8 before we installed the regulator. We set it down to 6 and will check it out today.

The guy at Ernie Elliott's shop where I bought it told me that that 8 is about right for that carb, and not to go from 90's square on the jets to 81's that I bought, or I'll burn up the motor.

I'm having someone rebuild my 750 VS to try out, too.

What kind on initial timing should I try? We have had it at 13, which may be too conservative?

It looks like the next trip I take up here, we will tear down the motor some to check the cam and maybe replace it with something more modern, along with the valvetrain, get rid of the stud girdle.


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 Post subject: Re: lack of performance
PostPosted: Wed Apr 28, 2021 8:56 am 
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Joined: Mon Oct 29, 2012 2:49 pm
Posts: 1339
Location: Orange County, NC
If you keep it a solid roller I would keep the stud girdle. That stuff moves around a lot without it when you run big spring pressures. I wont even run a solid flat tappet cam without a stud girdle.


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