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Re: Carb specialists question
[Re: madscientist]
#3078684
09/19/22 11:08 AM
09/19/22 11:08 AM
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Joined: Sep 2014
Posts: 4,457
Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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That .039 IFR is HUUUUGE. I can’t think of a single carb I’ve done with an IFR that big. You have other issues, like that funky timing curve. You need to lower the IFR. It’s easy to do and it needs to be done.
BTW, what carb is this and what size engine.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Carb specialists question
[Re: madscientist]
#3078700
09/19/22 12:16 PM
09/19/22 12:16 PM
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Joined: Oct 2003
Posts: 4,013
South Park, Pa.
68LAR
OP
master
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OP
master
Joined: Oct 2003
Posts: 4,013
South Park, Pa.
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That .039 IFR is HUUUUGE. I can’t think of a single carb I’ve done with an IFR that big. You have other issues, like that funky timing curve. You need to lower the IFR. It’s easy to do and it needs to be done.
BTW, what carb is this and what size engine. The carb is Quick Fuel 1050AN the engine is 493 stroker. My counter weights aren't bouncing. I've confirmed that many times. Timing marks are rock steady. Also, the car can creep along without touching the gas. The problem is part throttle or light throttle to cruise on a flat level road at the rpm that I have stated.
Last edited by 68LAR; 09/19/22 12:38 PM.
4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight
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Re: Carb specialists question
[Re: 68LAR]
#3078706
09/19/22 12:53 PM
09/19/22 12:53 PM
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Joined: Oct 2007
Posts: 4,209
New York
polyspheric
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master
Joined: Oct 2007
Posts: 4,209
New York
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The reason for the "divide by 2" rule?
So Holley gets fewer phone calls.
Cars with very hot cams, very tall axle, small engine will drive better if done by test.
Divide by 2 may give you a useful number, but the practical tests (must pass both):
1. Can you reach your highest cruising speed with the PV closed (PV # less than cruise vacuum)?
2. Does the PV open when you want to pass or accelerate (or sag, flat spot, cough)?
Boffin Emeritus
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Re: Carb specialists question
[Re: madscientist]
#3078744
09/19/22 02:35 PM
09/19/22 02:35 PM
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Joined: Oct 2003
Posts: 4,013
South Park, Pa.
68LAR
OP
master
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OP
master
Joined: Oct 2003
Posts: 4,013
South Park, Pa.
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That .039 IFR is HUUUUGE. I can’t think of a single carb I’ve done with an IFR that big. You have other issues, like that funky timing curve. You need to lower the IFR. It’s easy to do and it needs to be done.
BTW, what carb is this and what size engine. . Also, I went back to the .035 IFR’s. The throttle response feels more sluggish. I haven’t driven the car to see what difference my changes have made. Raining here now. It felt really good with the .039 IFR’s. Real crisp throttle response
4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight
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