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Author
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Topic: Quick powervalve question
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Bloose
Gearhead Posts: 692
From: Milwaukee, WI
Registered: Dec 2001
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posted 05-06-2004 02:52 AM
   
If I have 5 in of Vac at Idle would a 3.5 power valve be the correct choice?TIA,
B-loose
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capri man
Gearhead Posts: 6652
From: doerun, ga.
Registered: Nov 2000
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posted 05-06-2004 09:09 AM
are you sure that you only have 5 in vacuum?? where are you checking it at??------------------
mike r
racing is real
everything else is just a game.
81 capri-7.33 @92mph 1/8
1.54 60 ft. http://www.angelfire.com/ny5/billswebsite/pg06.html
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bud4660
Gearhead Posts: 518
From: Mesquite, Tx. M&M #2925
Registered: Apr 2003
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posted 05-06-2004 10:04 AM
quote:
Originally posted by Bloose:
If I have 5 in of Vac at Idle would a 3.5 power valve be the correct choice?TIA,
B-loose
That would be my choice. Should work.
Bud
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Bloose
Gearhead Posts: 692
From: Milwaukee, WI
Registered: Dec 2001
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posted 05-06-2004 08:08 PM
That's about what I measured. I'll check it again when I get the headers back from getting coated and can run the motor again. The cam is 254* @.050 with a 108LSA. Does 5 in sound low?Thanks,
B-loose
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bluestreek
Gearhead Posts: 1724
From: Athens,GA
Registered: Jul 2001
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posted 05-06-2004 08:40 PM
What rpm are you checking it at?? Seems a little low but that's not a weeny cam.------------------
1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank, rods and girdle, TFS alum. heads, Stealth 8020 intake, Xtreme 268 Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
11.86 @ 116 mph (7.62 @ 93 mph)daily driver!
DanH
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steve'66
Gearhead Posts: 9104
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 05-06-2004 10:01 PM
With 5"s of vacuum I'd plug it and up the jets 8 numbers.  SteveW
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capri man
Gearhead Posts: 6652
From: doerun, ga.
Registered: Nov 2000
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posted 05-06-2004 10:09 PM
i very well could be wrong but im thinking he checked it on the wrong vacuum port.------------------
mike r
racing is real
everything else is just a game.
81 capri-7.33 @92mph 1/8
1.54 60 ft. http://www.angelfire.com/ny5/billswebsite/pg06.html
IP: Logged |
Bloose
Gearhead Posts: 692
From: Milwaukee, WI
Registered: Dec 2001
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posted 05-07-2004 03:07 AM
I'll check again when I get the headers. I checked on the vacuum port in the base of my Mighty Demon. TIA.
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Bloose
Gearhead Posts: 692
From: Milwaukee, WI
Registered: Dec 2001
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posted 05-23-2004 03:48 PM
Finally got the headers back and fired up the car again. Checked the vacuum again and it is 5~5.5in of Vac. I double checked and I do have the correct vac port, so I'll be changing the PV for a 3.5.B-loose
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DidgeyTrucker
Gearhead Posts: 1237
From: Greenbrier, TN USA
Registered: Oct 99
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posted 05-23-2004 05:07 PM
A friend of mine finally got his '69 running a few weeks ago. I don't know all the specs but he is running a 351W with a fairly hot cam, port work and headers. I checked his vacuum at idle (in drive) and it was also around 5-1/2 to 6-1/2.I put a 3.5 in the 750 Holley and it works great. The 5.5 that was in it was opening when he put in gear and that caused the motor to stall from running rich. Tracy
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