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Re: Holley Power valve suggestions............
[Re: Kern Dog]
#921408
02/05/11 02:58 AM
02/05/11 02:58 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I'm gonna go way out on the limb & say slight intake vacuum leak. Blackish smoke?. How much vac at idle in gear
live every 24 hour block of time like it's your last day on earth
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Re: Holley Power valve suggestions............
[Re: radar]
#921410
02/05/11 05:30 AM
02/05/11 05:30 AM
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Joined: Feb 2010
Posts: 18,493 Granite Bay CA
Kern Dog
OP
Striving for excellence
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OP
Striving for excellence
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
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I dont have any sophisticated analyzing equipment. I wish that I did. I DO have a vacuum guage, and this weekend I have the time to work on the car. The Barry Grant model I have came with 80/85 jets and a 6.5 PV originally. Last month I dug in to get a look. The Dyno guy put in the fatter jets and PV, so I am trying to get this carb back to stock to establish a baseline #. I have an assortment of jets and power valves, along with a set of teardown gaskets. So far I changed the primary jets back to #80 and lowered the PV to a 3.5. It idled cleaner than usual.... ZERO smoke, and it revved nice. No street time yet though. The smoking issue: Yes, it would smoke a grayish black. It wasnt always right as I accelerated, it was wierd. I could roll around on the primaries all day with hardly any smoke at all. Once I dipped into the secondaries I got a small blast of grayish/black smoke, then near the top of each gear the smoke would really blow out. I did find once that the oil pan bolts were loose and found oil streaks on each header. I tightened the bolts and the smoke was far less. Later I got under the car again and noticed oil residue caked on the exhaust crossover pipe. The Trans speedo housing had a bad O ring! I never noticed ATF on the floor before because I have a black carpet remnant that I park on. The ATF leaves a gray color when burned, compared to a whiter color of engine oil smoke. I have yet to have the time to run the car since sealing the trans leak or the carb mods, but this could be the weekend!
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Re: Holley Power valve suggestions............
[Re: Kern Dog]
#921411
02/05/11 11:35 AM
02/05/11 11:35 AM
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Joined: May 2005
Posts: 416 Franklin Co. Illinois
runinonmt
mopar
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mopar
Joined: May 2005
Posts: 416
Franklin Co. Illinois
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Poor man's ignition tester - gap a known good spark plug at 1/4". stick it on the end of a plug wire and crank the engine. If it won't jump that gap in open air,it certainly won't fire under compression. On the power valve,if changing to a lower valve helped either the old one was leaking slightly or the idle speed screw was opened too far and the transition slots were overexposed. Despite what Holley says the power valve should have no effect at idle. it is just an aid for transition. On my Duster's 360 I'm using a 750 Holley with a 9.5 Power valve. To get the right transition slot opening I set the initial timing to 17 Degrees. It runs smoothly and revs freely. I need to lean out the idle a bit but it starts so well I hate to. DaveRS23 brought this to my attention. he runs a 500" Cuda that puts out 530 H.P. at the rear wheels and uses a 10.5 power valve and he has spent YEARS aquiring this knowledge. The power valve channel restrictors,as has been said can be used to adress a mixture problem,usually just coming up with the same total area of the jets and restrictors as original will suffuce. On an aside, I was watching Horsepower T.V. (yeah I know) do a dyno run and at high R.P.M. fuel was being pulled from the Accelerator pump nozzles. Maybe something to think about. O.K. rest your eyes for a minute and go play. Those of us in cold country are jealous.P.M. or e-mail me if you need more. Ron
In sixty-five I was seventeen and running up one-o-one
I don't know where I'm running now, I'm just running on
Jackson Browne-Running On Empty
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Re: Holley Power valve suggestions............
[Re: radar]
#921414
02/06/11 11:09 AM
02/06/11 11:09 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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What Radar said, I'd get a new bathtub gasket & mock it up to see if the sides have been milled the right amt for spot on port alignment & if good install it w a THIN/EVEN coat of permatex #2 on both sides of the 8 port holes in the tin and I think there are now several varieties of RTV that will holdup there also. Still bad, if you have access to shop air & can borrow a leakdown gauge set, see what you get but I'm bettin on the valley pan gasket EDIT read this (5 minutes). "breakin secrets" at www.mototuneusa.com
Last edited by RapidRobert; 02/06/11 11:15 AM.
live every 24 hour block of time like it's your last day on earth
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